0000950170-23-055453 | 10-Q | XBRL Viewer

(9,860,000)

(2,250)

125

122

Dividends attributable to non-controlling interests

(94)

(1)

Issuance of shares under employee stock compensation plans

(56)

Issuance of shares under employee stock compensation plans (in shares)

17,000

Additional non-controlling interests

Equity, ending balance at Mar. 31, 2022

11,075

10,826

2,423

(3)

(2,242)

11,004

Equity, ending balance (in shares) at Mar. 31, 2022

112,213,000

Increase (Decrease) in Stockholders' Equity [Roll Forward]

(2,144,000)

(471)

114

109

Dividends attributable to non-controlling interests

(90)

(2)

Issuance of shares under employee stock compensation plans (in shares)

(244)

27,000

Additional non-controlling interests

Equity, ending balance at Jun. 30, 2022

10,417

10,855

1,971

(3)

(2,486)

10,337

Equity, ending balance (in shares) at Jun. 30, 2022

110,096,000

Increase (Decrease) in Stockholders' Equity [Roll Forward]

(1,789,000)

(369)

192

190

Dividends attributable to non-controlling interests

(86)

(5)

Issuance of shares under employee stock compensation plans

(234)

Issuance of shares under employee stock compensation plans (in shares)

355,000

Reduction of non-controlling interests (ii)

(14)

^[2]

(2)

Equity, ending balance at Sep. 30, 2022

^[2]

9,913

10,855

1,706

(3)

(2,720)

9,838

Equity, ending balance (in shares) at Sep. 30, 2022

108,662,000

Equity, beginning balance at Dec. 31, 2022

10,093

10,876

1,764

(3)

(2,621)

10,016

Equity, beginning balance (in shares) at Dec. 31, 2022

106,756,000

Increase (Decrease) in Stockholders' Equity [Roll Forward]

(432,000)

(104)

(3)

(104)

206

203

(89)

Issuance of shares under employee stock compensation plans (in shares)

59,000

Equity, ending balance at Mar. 31, 2023

(1)

10,176

10,890

1,774

(2,568)

10,096

Equity, ending balance (in shares) at Mar. 31, 2023

106,383,000

Increase (Decrease) in Stockholders' Equity [Roll Forward]

(1,537,000)

(350)

Dividends attributable to non-controlling interests

(89)

(4)

Issuance of shares under employee stock compensation plans (in shares)

97,000

Equity, ending balance at Jun. 30, 2023

9,877

10,910

1,429

(2,540)

9,799

Equity, ending balance (in shares) at Jun. 30, 2023

104,943,000

Increase (Decrease) in Stockholders' Equity [Roll Forward]

(1,681,000)

(350)

139

136

Dividends attributable to non-controlling interests

(88)

(8)

Issuance of shares under employee stock compensation plans (in shares)

(78)

(80)

59,000

Reduction of non-controlling interests (ii)

^[2]

(29)

Equity, ending balance at Sep. 30, 2023

$ 9,485

$ 10,903

$ 1,127

$ 0

$ (2,620)

$ 9,410

$ 75

Equity, ending balance (in shares) at Sep. 30, 2023

103,321,000

[1]	Accumulated other comprehensive loss, net of tax (‘AOCL’).
[2]	Attributable to the divestiture of businesses that are less than wholly-owned or the acquisition of shares previously owned by minority interest holders

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Sep. 30, 2023	Dec. 31, 2022
Preference shares, nominal value (USD per share)	$ 0.000115	$ 0.000115
Preference shares, shares authorized	1,000,000,000	1,000,000,000
Preference shares, shares issued	0	0
Ordinary shares, $0.000304635 nominal value [Member]
Ordinary shares, nominal value	$ 0.000304635	$ 0.000304635
Ordinary shares, shares authorized	1,510,003,775	1,510,003,775
Ordinary shares, shares issued	103,321,046	106,756,364
Ordinary shares, shares outstanding	103,321,046	106,756,364
Treasury shares		17,519

Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022
Statement of Stockholders' Equity [Abstract]
Dividends declared per share	$ 0.84	$ 0.84	$ 0.84	$ 0.82	$ 0.82	$ 0.82

Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Operating Loss Carryforwards [Line Items]
Provision for income taxes	$ 25	$ 1	$ 99	$ 63
Effective tax rate	15.50%	0.70%	18.30%	12.10%
Liabilities for uncertain tax positions	$ 41		$ 41
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Expected decrease in liability for uncertain tax position	1		1
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Expected decrease in liability for uncertain tax position	$ 2		$ 2

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]

Fair Value Measurements - Fair Value Liabilities Measured Using Significant Unobservable Inputs Level 3 (Details)
$ in Millions

9 Months Ended

Sep. 30, 2023

USD ($)

Balance as of beginning of period

$ 40

Obligations assumed

Payments

(2)

Realized and unrealized losses

$ 3

^[1]

Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]

Other Cost and Expense, Operating

Foreign exchange

$ (1)

Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]

Other Cost and Expense, Operating

Balance as of end of period

$ 40

[1]	Realized and unrealized losses include accretion and adjustments to contingent consideration liabilities, which are included within Interest expense and Other operating expenses, respectively, on the condensed consolidated statements of comprehensive income.

Segment Information - Revenue (Net of Reimbursable Expenses) of the Reported Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Segment revenue	$ 2,166	$ 1,953	$ 6,569	$ 6,144
Segment operating income	159	154	586	470
HWC [Member]
Segment Reporting Information [Line Items]
Segment revenue	1,298	1,178	3,833	3,608
R&B [Member]
Segment Reporting Information [Line Items]
Segment revenue	858	767	2,668	2,515
Operating Segments [Member]
Segment Reporting Information [Line Items]
Segment revenue	2,137	1,927	6,443	6,073
Segment operating income	439	341	1,295	1,175
Operating Segments [Member] \| HWC [Member]
Segment Reporting Information [Line Items]
Segment revenue	1,282	1,162	3,784	3,565
Segment operating income	305	236	836	710
Operating Segments [Member] \| R&B [Member]
Segment Reporting Information [Line Items]
Segment revenue	855	765	2,659	2,508
Segment operating income	$ 134	$ 105	$ 459	$ 465

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Income Taxes

9 Months Ended

Sep. 30, 2023

Income Tax Disclosure [Abstract]

Income Taxes

Note 7 — Income Taxes

Provision for income taxes for the three and nine months ended September 30, 2023 was $25 million and $99 million, respectively, compared to $1 million and $63 million for the three and nine months ended September 30, 2022, respectively. The effective tax rates were 15.5% and 18.3% for the three and nine months ended September 30, 2023, respectively, and 0.7% and 12.1% for the three and nine months ended September 30, 2022, respectively. These effective tax rates are calculated using extended values from our condensed consolidated statements of comprehensive income and are therefore more precise tax rates than can be calculated from rounded values. The prior-year quarter effective tax rate was lower due to certain discrete tax benefits related to amending the Company’s U.S. federal and state tax returns in order to change certain elections available under the Coronavirus Aid, Relief, and Economic Security (‘CARES’) Act, and excess tax benefits on executive share-based compensation.

The Company recognizes deferred tax balances related to the undistributed earnings of subsidiaries when it expects that it will recover those undistributed earnings in a taxable manner, such as through receipt of dividends or sale of the investments. Historically, the Company has not provided taxes on cumulative earnings of its subsidiaries that have been reinvested indefinitely. As a result of its plans to restructure or distribute accumulated earnings of certain foreign operations, the Company has recorded an estimate of non-U.S. withholding and state income taxes. However, the Company asserts that the historical cumulative earnings of its other subsidiaries are reinvested indefinitely and therefore does not provide deferred tax liabilities on these amounts.

The Company records valuation allowances against net deferred tax assets based on whether it is more likely than not that the deferred tax assets will be realized. We have liabilities for uncertain tax positions under ASC 740, Income Taxes of $41 million, excluding interest and penalties. The Company believes the outcomes that are reasonably possible within the next 12 months may result in a reduction in the liability for uncertain tax positions of approximately $1 million to $2 million, excluding interest and penalties.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480990/946-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//740/tableOfContent

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-14

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-21

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 270
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482526/740-270-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 17
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-17

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.5.Q1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482603/740-30-50-2

Earnings Per Share - Narrative (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Restricted share units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Antidilutive securities excluded from computation of earnings per share		0.3		0.3
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Antidilutive securities excluded from computation of earnings per share	0.0	0.0	0.0	0.0
Time-based award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding	0.0		0.0
Restricted share units outstanding	0.5	0.4	0.5	0.4
Performance-Based Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding	0.0	0.0	0.0	0.0
Restricted share units outstanding	0.6	0.6	0.6	0.6

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 1D
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480483/718-10-35-1D

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480483/718-10-35-3

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(01)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(02)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(03)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(01)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(02)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(03)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (e)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iv)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(v)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Acquisitions and Divestitures

Acquisitions and Divestitures - Divestment of Russian Business (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Discontinued Operations and Disposal Groups [Abstract]
Deconsolidation gain or loss amount	$ (57)
Impairment	$ 81	$ 0	$ 81

Acquisitions and Divestitures

9 Months Ended

Sep. 30, 2023

Dispositions [Abstract]

Note 3 — Acquisitions and Divestitures

Divestitures

Divestment of Russian Business

During the first quarter of 2022, WTW announced its intention to transfer ownership of its Russian subsidiaries to local management who will operate independently in the Russian market. Due to the sanctions and prohibitions on certain types of business and activities, WTW deconsolidated its Russian entities on March 14, 2022. The transfer of its Russian subsidiaries to local management was completed on the agreed-upon terms on July 18, 2022, and the transfer was registered in Russia on July 25, 2022. The deconsolidation in the first quarter of 2022 resulted in a loss of $57 million, which includes an allocation of Risk & Broking goodwill, and was recognized as a loss on disposal of a business within Other income, net on our condensed consolidated statements of comprehensive income. Further, certain Russian insurance contracts were placed historically by our U.K. brokers into the London market, the majority of which were under multi-year terms resulting in both current and non-current accounts receivables. Total net assets impaired, including accounts receivable balances related to our Russian business that are held outside of our Russian entities, were $81 million recorded during the three months ended March 31, 2022 in Other operating expenses on our condensed consolidated statements of comprehensive income.

Willis Re Divestiture

On August 13, 2021, the Company entered into a definitive security and asset purchase agreement (the ‘Willis Re SAPA’) to sell its treaty-reinsurance business (‘Willis Re’) to Arthur J. Gallagher & Co. (‘Gallagher’), a leading global provider of insurance, risk management and consulting services, for total upfront cash consideration of $3.25 billion plus an earnout payable in 2025 of up to $750 million in cash, subject to certain adjustments. The deal was subject to required regulatory approvals and clearances, as well as other customary closing conditions, and was completed on December 1, 2021 (‘Principal Closing’). Although the majority of the Willis Re businesses transferred to Gallagher at Principal Closing, the assets and liabilities of certain Willis Re businesses were not transferred to Gallagher at the time due to local territory restrictions (‘Deferred Closing’). The Deferred Closing for all but one business was completed during the second quarter of 2022, and all net earnings of the Deferred Closing businesses accumulated between the Principal Closing and Deferred Closing remained payable to Gallagher at June 30, 2022 and September 30, 2022. The Company recognized a preliminary pre-tax gain of $2.3 billion upon completion of the sale in 2021, and during the second quarter of 2022, WTW recognized a $60 million reduction to the pre-tax gain related to an updated estimate of the working capital transferred upon disposal. The Company recognized the final allocation of the proceeds and related tax expense, as well as an adjustment of certain indemnities for the three months ended September 30, 2022. These amounts as well as the amounts payable with respect to the settled Deferred Closing businesses were remitted to Gallagher in October 2022. The remaining Deferred Closing business transferred during the fourth quarter of 2022, and all businesses have now been transferred to Gallagher. The gain is subject to tax in certain jurisdictions, mainly in the U.S., and is predominantly tax-exempt in the U.K.

In connection with the transaction, the Company reclassified the results of its Willis Re operations as discontinued operations on its condensed consolidated statements of comprehensive income and reclassified Willis Re assets and liabilities as held for sale on its condensed consolidated balance sheets. The condensed consolidated cash flow statements were not adjusted for the divestiture. Willis Re was previously included in the Company's former Investment, Risk and Reinsurance segment. As noted above, the results of the Deferred Closing businesses following the Principal Closing until their respective Deferred Closing dates have been included in income from discontinued operations on the condensed consolidated statements of comprehensive income during 2022.

The Company will account for the earnout as a gain contingency and therefore did not record any receivables upon close. Rather, the earnout will be recognized in the Company’s condensed consolidated financial statements, if it is received, in 2025.

A number of services are continuing under a cost reimbursement Transition Services Agreement (‘TSA’) in which WTW is providing Gallagher support including real estate leases, information technology, payroll, human resources and accounting. During the third quarter of 2023, the term for these services was extended from November 30, 2023 to May 31, 2024 and may be further extended by Gallagher, in accordance with the terms of the TSA. Fees earned under the TSA were $11 million and $29 million during the three and nine months ended September 30, 2023, respectively, and $8 million and $31 million during the three and nine months ended September 30, 2022, respectively, and have been recognized as a reduction to the costs incurred to service the TSA and are included in continuing operations within Other operating expenses on the condensed consolidated statements of comprehensive income. Costs incurred to service the TSA are expected to be reduced as part of the Company’s Transformation program (see Note 6 — Restructuring Costs for a description of the program) as quickly as possible when the services are no longer required by Gallagher.

The following selected financial information relates to the operations of Willis Re for the periods presented:


	Three Months Ended September 30, 2022			Nine Months Ended September 30, 2022

Revenue from discontinued operations	$	10		$	50
Costs of providing services
Salaries and benefits		5			13
Other operating expenses		—			1
Total costs of providing services		5			14
Other income, net		—			—
Income from discontinued operations before income taxes		5			36
Adjustment to gain on disposal of Willis Re		(2	)		(65	)
Benefit from income taxes		5			7
Net income payable to Gallagher on Deferred Closing		—			(5	)
Income/(loss) from discontinued operations, net of tax	$	8		$	(27	)

The expense amounts reflected above represent only the direct costs attributable to the Willis Re business and exclude allocations of corporate costs that will be retained following the sale. Neither the discontinued operations presented above, nor the unallocated corporate costs, reflect the impact of any cost reimbursement that will be received under the TSA.

Certain amounts included in the condensed consolidated balance sheets did not transfer to Gallagher under the terms of the Willis Re SAPA, and instead were to be settled by the Company, noting that certain fiduciary positions continued to be held under the terms of various co-broking agreements between subsidiaries of the Company and Gallagher. At December 31, 2022, the amounts of significant assets and liabilities related to the Willis Re businesses which were not transferred in the sale were $3.2 billion of fiduciary assets and liabilities, $29 million of accounts receivable and $73 million of other current liabilities. On May 31, 2023, the Company and Gallagher entered into a side letter to the Willis Re SAPA which became effective on June 1, 2023 and which (A) ended the co-broking agreements prospectively and which (B) transferred related fiduciary and certain non-fiduciary assets and liabilities to Gallagher at that time based on then-current estimates. These non-fiduciary amounts were finalized in the third quarter of 2023. The value of the initial transfer amounted to $74 million of other current liabilities less $26 million of accounts receivables due to the Company, totaling $48 million of net cash transferred to Gallagher. Additionally, total fiduciary assets and liabilities of $4.5 billion, including $868 million of fiduciary cash, was transferred to Gallagher. The total cash outflow of $916 million is included in cash used in investing activities in the condensed consolidated statement of cash flows. During the third quarter of 2023, WTW and Gallagher agreed to a final settlement of all balances which resulted in a $5 million increase to the gain on disposal recognized during the three months and nine months ended September 30, 2023 and is included within Other income, net on our condensed consolidated statements of comprehensive income. The settlement of remaining amounts owed to Gallagher totaling $11 million was accrued in Deferred revenue and accrued expenses on the condensed consolidated balance sheet at September 30, 2023 and was transferred in October 2023.

Other Divestitures

During the nine months ended September 30, 2023, the Company completed other divestitures for total cash consideration of $86 million and net gains on disposal of $39 million, which is included within Other income, net on our condensed consolidated statements of comprehensive income.

Acquisitions and Divestitures (Tables)

9 Months Ended

Sep. 30, 2023

Business Combinations [Abstract]

Schedule of Selected Financial Information and Summary of Total Assets and Liabilities Relates to the Operations of Willis Re

The following selected financial information relates to the operations of Willis Re for the periods presented:


	Three Months Ended September 30, 2022			Nine Months Ended September 30, 2022

Revenue from discontinued operations	$	10		$	50
Costs of providing services
Salaries and benefits		5			13
Other operating expenses		—			1
Total costs of providing services		5			14
Other income, net		—			—
Income from discontinued operations before income taxes		5			36
Adjustment to gain on disposal of Willis Re		(2	)		(65	)
Benefit from income taxes		5			7
Net income payable to Gallagher on Deferred Closing		—			(5	)
Income/(loss) from discontinued operations, net of tax	$	8		$	(27	)

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-SubTopic 10
-Topic 360
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482099/360-10-50-3

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483475/205-20-45-11

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483499/205-20-50-3A

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483499/205-20-50-4A

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483499/205-20-50-4B

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483499/205-20-50-5A

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483499/205-20-50-5B

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5C
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483499/205-20-50-5C

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5D
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483499/205-20-50-5D

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483499/205-20-50-7

Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482099/360-10-50-3A

Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 20
-Topic 205
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483499/205-20-50-1

Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483499/205-20-50-3

Schedule of Basic and Diluted Earnings Per Share

Debt - Schedule of Current and Long-term Debt (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Current debt	$ 649,000,000	$ 250,000,000
Long-term debt, excluding current maturities	4,565,000,000	4,471,000,000
Revolving15 Billion Dollar Credit Facility Member \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	1,500,000,000
4.625% senior notes due 2023 [Member]
Debt Instrument [Line Items]
Current debt	$ 0	$ 250,000,000
Stated interest rate	4.625%	4.625%
Debt instrument maturity year	2023	2023
3.600% senior notes due 2024 [Member]
Debt Instrument [Line Items]
Current debt	$ 649,000,000	$ 0
Stated interest rate	3.60%	3.60%
Debt instrument maturity year	2024	2024
Long-term debt, excluding current maturities	$ 0	$ 649,000,000
4.400% senior notes due 2026 [Member]
Debt Instrument [Line Items]
Stated interest rate	4.40%	4.40%
Debt instrument maturity year	2026	2026
Long-term debt, excluding current maturities	$ 548,000,000	$ 547,000,000
4.650% senior notes due 2027 [ Member]
Debt Instrument [Line Items]
Stated interest rate	4.65%	4.65%
Debt instrument maturity year	2027	2027
Long-term debt, excluding current maturities	$ 744,000,000	$ 744,000,000
4.500% senior notes due 2028 [Member]
Debt Instrument [Line Items]
Stated interest rate	4.50%	4.50%
Debt instrument maturity year	2028	2028
Long-term debt, excluding current maturities	$ 597,000,000	$ 597,000,000
2.950% senior notes due 2029 [Member]
Debt Instrument [Line Items]
Stated interest rate	2.95%	2.95%
Debt instrument maturity year	2029	2029
Long-term debt, excluding current maturities	$ 726,000,000	$ 726,000,000
5.350% senior notes due 2033 [Member]
Debt Instrument [Line Items]
Stated interest rate	5.35%	5.35%
Debt instrument maturity year	2033	2033
Long-term debt, excluding current maturities	$ 741,000,000	$ 0
6.125% senior notes due 2043 [Member]
Debt Instrument [Line Items]
Stated interest rate	6.125%	6.125%
Debt instrument maturity year	2043	2043
Long-term debt, excluding current maturities	$ 272,000,000	$ 271,000,000
5.050% senior notes due 2048 [Member]
Debt Instrument [Line Items]
Stated interest rate	5.05%	5.05%
Debt instrument maturity year	2048	2048
Long-term debt, excluding current maturities	$ 395,000,000	$ 395,000,000
3.875% senior notes due 2049 [Member]
Debt Instrument [Line Items]
Stated interest rate	3.875%	3.875%
Debt instrument maturity year	2049	2049
Long-term debt, excluding current maturities	$ 542,000,000	$ 542,000,000

Other Income, Net (Parenthetical) (Details) $ in Millions	9 Months Ended
Other Income, Net (Parenthetical) (Details) $ in Millions	Sep. 30, 2022 USD ($)
Non-cash Revaluation Gain Related to Acquisition [Member]
Business Acquisition [Line Items]
Gain on disposal of operations	$ 24

Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Gains/losses on derivatives to be reclassified within the next twelve months	$ 1
Maximum [Member]
Derivative [Line Items]
Longest outstanding maturity	1 year 8 months 12 days
Not Designated as Hedging Instrument [Member] \| Foreign exchange contracts [Member]
Derivative [Line Items]
Derivative, notional amount	$ 911	$ 1,700
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other Assets, Noncurrent
Derivative liability, fair value	$ 1
Derivative assets, fair value		$ 24
Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member] \| Foreign exchange contracts [Member]
Derivative [Line Items]
Derivative, notional amount	$ 106	$ 134
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Derivative liability, fair value	$ 1	$ 3

Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2023

Earnings Per Share [Abstract]

Basic and diluted earnings per share are as follows:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2023			2022			2023			2022
Income from continuing operations	$	139		$	184		$	441		$	458
Less: income attributable to non-controllable interests		(3	)		(2	)		(8	)		(10	)
Income from continuing operations attributable to WTW	$	136		$	182		$	433		$	448

Income/(loss) from discontinued operations, net of tax	$	—		$	8		$	—		$	(27	)

Basic average number of shares outstanding		105			110			106			113
Dilutive effect of potentially issuable shares		—			1			1			1
Diluted average number of shares outstanding		105			111			107			114

Basic earnings per share from continuing operations attributable to WTW	$	1.30		$	1.65		$	4.08		$	3.95
Dilutive effect of potentially issuable shares		(0.01	)		—			(0.02	)		—
Diluted earnings per share from continuing operations attributable to WTW	$	1.29		$	1.65		$	4.06		$	3.95

Basic earnings/(loss) per share from discontinued operations, net of tax	$	—		$	0.07		$	—		$	(0.24	)
Dilutive effect of potentially issuable shares		—			—			—			—
Diluted earnings/(loss) per share from discontinued operations, net of tax	$	—		$	0.07		$	—		$	(0.24	)

Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2023	Oct. 23, 2023
Cover [Abstract]
Amendment Flag	false
Document Type	10-Q
Document Period End Date	Sep. 30, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Entity Registrant Name	WILLIS TOWERS WATSON PLC
Entity Central Index Key	0001140536
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		103,260,407
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Trading Symbol	WTW
Title of 12(b) Security	Ordinary Shares, nominal value $0.000304635 per share
Security Exchange Name	NASDAQ
Entity File Number	001-16503
Entity Incorporation, State or Country Code	L2
Entity Tax Identification Number	98-0352587
Entity Address, Address Line One	c/o Willis Group Limited
Entity Address, Address Line Two	51 Lime Street
Entity Address, City or Town	London
Entity Address, Country	GB
Entity Address, Postal Zip Code	EC3M 7DQ
City Area Code	011
Local Phone Number	44-20-3124-6000
Document Quarterly Report	true
Document Transition Report	false

Goodwill and Other Intangible Assets - Components of Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	$ 10,665
Accumulated impairment losses, beginning balance	(492)
Goodwill, net, beginning balance	10,173
Goodwill disposals	(21)
Foreign exchange	(9)
Goodwill, gross, ending balance	10,635
Accumulated impairment losses, ending balance	(492)
Goodwill, net, ending balance	10,143
HWC [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	7,870
Accumulated impairment losses, beginning balance	(130)
Goodwill, net, beginning balance	7,740
Goodwill disposals	(21)
Foreign exchange	0
Goodwill, gross, ending balance	7,849
Accumulated impairment losses, ending balance	(130)
Goodwill, net, ending balance	7,719
R&B [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	2,795
Accumulated impairment losses, beginning balance	(362)
Goodwill, net, beginning balance	2,433
Goodwill disposals	0
Foreign exchange	(9)
Goodwill, gross, ending balance	2,786
Accumulated impairment losses, ending balance	(362)
Goodwill, net, ending balance	$ 2,424

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Derivative Financial Instruments - Schedule of Derivative Instruments, Effect on Condensed Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Other income, net [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign exchange contracts [Member]
Derivative [Line Items]
(Loss)/gain recognized in income	$ (13)	$ (182)	$ 3	$ (208)

Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2023

Sep. 30, 2022

Sep. 30, 2023

Sep. 30, 2022

Revenue from Contract with Customer, Excluding Assessed Tax

$ 2,124

$ 1,919

$ 6,445

$ 6,043

^[1],[2]

^[1]

124

101

2,166

1,953

6,569

6,144

HWC [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

1,291

1,172

3,811

3,576

^[1],[2]

^[1]

1,298

1,178

3,833

3,608

R&B [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

831

749

2,605

2,458

^[1],[2]

^[1]

858

767

2,668

2,515

Corporate

Revenue from Contract with Customer, Excluding Assessed Tax

^[1],[2]

(2)

^[1],[2]

(2)

(5)

(6)

^[1],[2]

^[1],[2]

Broking [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

914

814

2,885

2,685

Broking [Member] | HWC [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

241

207

789

714

Broking [Member] | R&B [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

673

606

2,088

1,963

Broking [Member] | Corporate

Revenue from Contract with Customer, Excluding Assessed Tax

^[1],[2]

Consulting [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

735

703

2,232

2,173

Consulting [Member] | HWC [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

643

616

1,947

1,886

Consulting [Member] | R&B [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

273

280

Consulting [Member] | Corporate

Revenue from Contract with Customer, Excluding Assessed Tax

^[1],[2]

Outsourced administration [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

293

240

846

757

Outsourced administration [Member] | HWC [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

272

222

779

696

Outsourced administration [Member] | R&B [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Outsourced administration [Member] | Corporate

Revenue from Contract with Customer, Excluding Assessed Tax

^[1],[2]

Other [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

165

149

415

384

Other [Member] | HWC [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

119

111

247

237

Other [Member] | R&B [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

168

147

Other [Member] | Corporate

Revenue from Contract with Customer, Excluding Assessed Tax

^[1],[2]

Service

Revenue from Contract with Customer, Excluding Assessed Tax

2,107

1,906

6,378

5,999

Service | HWC [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

1,275

1,156

3,762

3,533

Service | R&B [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

828

747

2,596

2,451

Service | Corporate

Revenue from Contract with Customer, Excluding Assessed Tax

^[1],[2]

$ 4

$ 3

$ 20

$ 15

[1]

For the three and nine months ended September 30, 2022, $9 million of interest income was reclassified from Reimbursable expenses and other to Interest and other income in order to show the allocation of interest income related to fiduciary assets to Corporate. This amount was previously unallocated, but was allocated beginning with the presentation in our Annual Report on Form 10-K, filed with the SEC on February 24, 2023, and is therefore included in the full-year results presented therein.

[2]

Reimbursable expenses and other, as well as Corporate revenue, are excluded from segment revenue, but included in total revenue on the condensed consolidated statements of comprehensive income. Amounts included in Corporate revenue may include eliminations, adjustments to reserves and impacts from hedged revenue transactions.

Acquisitions and Divestitures - Schedule of Selected Financial Information Relates to the Operations of Willis Re (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Adjustment to gain on disposal of Willis Re			$ 44	$ (76)
Income/(loss) from discontinued operations, net of tax	$ 0	$ 8	$ 0	(27)
Willis Re [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue from discontinued operations		10		50
Salaries and benefits		5		13
Other operating expenses		0		1
Total costs of providing services		5		14
Other income, net		0		0
Income from discontinued operations before income taxes		5		36
Adjustment to gain on disposal of Willis Re		(2)		(65)
Provision for income taxes		5		7
Net income payable to Gallagher on Deferred Closing		0		(5)
Income/(loss) from discontinued operations, net of tax		$ 8		$ (27)

Segment Information (Tables)

9 Months Ended

Sep. 30, 2023

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The following table presents segment revenue and segment operating income for our reportable segments for the three months ended September 30, 2023 and 2022.


	Three Months Ended September 30,
	HWC				R&B				Total
	2023		2022		2023		2022		2023		2022
Segment revenue	$	1,282	$	1,162	$	855	$	765	$	2,137	$	1,927

Segment operating income	$	305	$	236	$	134	$	105	$	439	$	341

The following table presents segment revenue and segment operating income for our reportable segments for the nine months ended September 30, 2023 and 2022.


	Nine Months Ended September 30,
	HWC				R&B				Total
	2023		2022		2023		2022		2023		2022
Segment revenue	$	3,784	$	3,565	$	2,659	$	2,508	$	6,443	$	6,073

Segment operating income	$	836	$	710	$	459	$	465	$	1,295	$	1,175

Net Operating Income of the Reported Segments

The following table presents reconciliations of the information reported by segment to the Company’s condensed consolidated statements of comprehensive income amounts reported for the three and nine months ended September 30, 2023 and 2022.


	Three Months Ended September 30,						Nine Months Ended September 30,
	2023			2022			2023			2022
Revenue:
Total segment revenue	$	2,137		$	1,927		$	6,443		$	6,073
Reimbursable expenses and other		29			26			126			71
Revenue	$	2,166		$	1,953		$	6,569		$	6,144

Total segment operating income	$	439		$	341		$	1,295		$	1,175
Impairment (i)		—			—			—			(81	)
Amortization		(62	)		(71	)		(203	)		(239	)
Restructuring costs (ii)		(17	)		(9	)		(30	)		(71	)
Transaction and transformation (iii)		(113	)		(50	)		(265	)		(108	)
Unallocated, net (iv)		(88	)		(57	)		(211	)		(206	)
Income from operations		159			154			586			470
Interest expense		(61	)		(54	)		(172	)		(154	)
Other income, net		66			85			126			205
Income from continuing operations before income taxes	$	164		$	185		$	540		$	521

(i)

Represents the impairment related to the net assets of our Russian business that are held outside of our Russian entities (see Note 3 — Acquisitions and Divestitures for further information).

(ii)

See Note 6 — Restructuring Costs for the composition of costs for 2023 and 2022.

(iii)

In 2023 and 2022, in addition to legal fees and other transaction costs, includes primarily consulting fees and compensation costs related to the Transformation program (see Note 6 — Restructuring Costs).

(iv)

Includes certain costs, primarily related to corporate functions which are not directly related to the segments, and certain differences between budgeted expenses determined at the beginning of the year and actual expenses that we report for U.S. GAAP purposes.

Supplementary Information for Certain Balance Sheet Accounts (Tables)

9 Months Ended

Sep. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Prepaid and Other Current Assets

Prepaid and other current assets consist of the following:


	September 30, 2023		December 31, 2022
Prepayments and accrued income	$	135	$	132
Deferred contract costs		72		71
Derivatives and investments		—		43
Deferred compensation plan assets		13		16
Corporate income and other taxes		202		89
Acquired renewal commissions receivable		8		9
Other current assets		39		54
Total prepaid and other current assets	$	469	$	414

Schedule of Other Current Liabilities

Other current liabilities consist of the following:


	September 30, 2023		December 31, 2022
Dividends payable	$	104	$	102
Income taxes payable		51		83
Interest payable		41		49
Deferred compensation plan liabilities		13		14
Contingent and deferred consideration on acquisitions		17		17
Accrued retirement benefits		32		32
Payroll and other benefits-related liabilities		235		225
Derivatives		3		4
Third-party commissions		99		124
Other current liabilities		35		66
Total other current liabilities	$	630	$	716

Provisions for Liabilities

Provision for liabilities consists of the following:


	September 30, 2023		December 31, 2022
Claims, lawsuits and other proceedings	$	302	$	296
Other provisions		58		61
Total provision for liabilities	$	360	$	357

Schedule of Other Non-current Liabilities

Other non-current liabilities consist of the following:


	September 30, 2023		December 31, 2022
Deferred compensation plan liability	$	73	$	74
Contingent and deferred consideration on acquisitions		23		29
Liabilities for uncertain tax positions		34		40
Finance leases		8		12
Other non-current liabilities		62		66
Total other non-current liabilities	$	200	$	221

Retirement Benefits (Tables)

9 Months Ended

Sep. 30, 2023

Retirement Benefits [Abstract]

Schedule of Net Periodic Benefit Cost

The following tables set forth the components of net periodic benefit (income)/cost for the Company’s defined benefit pension plans for the three and nine months ended September 30, 2023 and 2022:


	Three Months Ended September 30,
	2023									2022
	U.S.			U.K.			Other			U.S.			U.K.			Other
Service cost	$	14		$	1		$	4		$	20		$	2		$	6
Interest cost		48			31			7			29			18			4
Expected return on plan assets		(76	)		(41	)		(10	)		(83	)		(34	)		(10	)
Settlements		—			—			—			3			1			—
Amortization of net loss		3			12			—			4			7			—
Amortization of prior service credit		—			(3	)		—			—			(3	)		1
Net periodic benefit (income)/cost	$	(11	)	$	—		$	1		$	(27	)	$	(9	)	$	1


	Nine Months Ended September 30,
	2023									2022
	U.S.			U.K.			Other			U.S.			U.K.			Other
Service cost	$	42		$	4		$	11		$	58		$	9		$	17
Interest cost		146			90			21			88			54			12
Expected return on plan assets		(228	)		(121	)		(29	)		(248	)		(110	)		(29	)
Settlements		1			—			(1	)		3			1			—
Amortization of net loss		9			36			—			11			22			2
Amortization of prior service credit		—			(9	)		1			—			(9	)		1
Net periodic benefit (income)/cost	$	(30	)	$	—		$	3		$	(88	)	$	(33	)	$	3

Debt - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
Debt - Narrative (Details) - USD ($) $ in Millions	May 17, 2023	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.625%
Proceeds from debt, net of issuance costs	$ 741
Repayment of debt including interest	256
Repayment of debt		$ 250
5.350% senior notes due 2033 [Member]
Debt Instrument [Line Items]
Stated interest rate		5.35%	5.35%	5.35%
Description of interest accrual date			Interest on the 2033 senior notes accrues from May 17, 2023 and will be paid in cash on May 15 and November 15 of each year, commencing on November 15, 2023.
5.350% senior notes due 2033 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 750
Stated interest rate	5.35%
Debt Instrument, Interest Rate, Effective Percentage	5.47%
Maturity Date	May 15, 2033
4.625% senior notes due 2023 [Member]
Debt Instrument [Line Items]
Stated interest rate		4.625%	4.625%	4.625%

Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)
$ in Millions

Sep. 30, 2023

USD ($)

Dec. 31, 2022

USD ($)

Contingent consideration [Member] | Fair Value Inputs, Discount Rate [Member]

Fair value inputs, weighted-average discount rate

0.1005

0.1026

Contingent consideration [Member] | Fair Value Inputs, Discount Rate [Member] | Minimum [Member]

Fair value inputs, weighted-average discount rate

0.0353

Contingent consideration [Member] | Fair Value Inputs, Discount Rate [Member] | Maximum [Member]

Fair value inputs, weighted-average discount rate

0.138

Recurring [Member]

Assets:

$ 96

^[1]

$ 7

^[2]

^[3],[4]

Recurring [Member] | Fiduciary Assets [Member]

^[2]

Assets:

Recurring [Member] | Commingled Funds [Member]

184

142

Assets:

Recurring [Member] | Hedge Funds [Member]

^[1],[5]

Assets:

Recurring [Member] | Level 1 [Member]

^[1],[6]

Assets:

^[1]

^[2]

^[3],[4]

Recurring [Member] | Level 1 [Member] | Fiduciary Assets [Member]

^[2]

Assets:

Recurring [Member] | Level 1 [Member] | Commingled Funds [Member]

184

142

Assets:

Recurring [Member] | Level 1 [Member] | Hedge Funds [Member]

^[1],[5]

Assets:

Recurring [Member] | Level 2 [Member]

^[1],[6]

Assets:

^[1]

^[2]

^[3],[4]

Recurring [Member] | Level 2 [Member] | Fiduciary Assets [Member]

^[2]

Assets:

Recurring [Member] | Level 2 [Member] | Commingled Funds [Member]

Assets:

Recurring [Member] | Level 2 [Member] | Hedge Funds [Member]

^[1],[5]

Assets:

Recurring [Member] | Level 3 [Member]

^[1],[6]

Assets:

^[1]

^[2]

^[3],[4]

Recurring [Member] | Level 3 [Member] | Fiduciary Assets [Member]

^[2]

Assets:

Recurring [Member] | Level 3 [Member] | Commingled Funds [Member]

$ 0

Assets:

Recurring [Member] | Level 3 [Member] | Hedge Funds [Member]

^[1],[5]

Assets:

Other Income and Expenses [Abstract]

^[1],[6]

$ 0

[1]	With the exception of the funds included in fiduciary assets, the majority of these balances are held as part of deferred compensation plans with related liabilities in other current liabilities and other non-current liabilities on the condensed consolidated balance sheets.
[2]	See Note 9 — Derivative Financial Instruments for further information on our derivative investments
[3]	Consideration due to be paid across multiple years until 2027.
[4]	Probability weightings are based on our knowledge of the past and planned performance of the acquired entity to which the contingent consideration applies. The fair value weighted-average discount rates used in our material contingent consideration calculations were 10.05% and 10.26% at September 30, 2023 and December 31, 2022, respectively. The range of these discount rates was 3.53% - 13.80% at September 30, 2023. Using different probability weightings and discount rates could result in an increase or decrease of the contingent consideration payable.
[5]	Consists of the Towers Watson Global Equity Focus Fund, for which redemptions can occur on any business day, and require a minimum of one business day’s notice.
[6]	Consists of the Towers Watson Alternative Credit Fund, for which the redemption period is generally quarterly, however requires a 50-day notice.

Leases

9 Months Ended

Sep. 30, 2023

Leases [Abstract]

Leases

Note 13 — Leases

The following tables present lease costs recorded on our condensed consolidated statements of comprehensive income for the three and nine months ended September 30, 2023 and 2022:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2023			2022			2023			2022
Finance lease cost:
Amortization of right-of-use assets	$	—		$	—		$	1		$	1
Interest on lease liabilities		—			1			1			2
Operating lease cost		43			35			114			130
Short-term lease cost		1			—			1			—
Variable lease cost		11			13			39			47
Sublease income		(3	)		(3	)		(9	)		(12	)
Total lease cost, net	$	52		$	46		$	147		$	168

The total lease cost is recognized in different locations in our condensed consolidated statements of comprehensive income. Amortization of the finance lease ROU assets is included in depreciation, while the interest cost component of these finance leases is included in interest expense. All other costs are included in other operating expenses, with the exception of $15 million and $23 million incurred during the three and nine months ended September 30, 2023, respectively, and $2 million and $33 million incurred during the three and nine months ended September 30, 2022, respectively, that were included in restructuring costs (see Note 6 — Restructuring Costs) that primarily related to the acceleration of amortization of certain abandoned ROU assets and the payment of early termination fees. There are no significant lease costs that have been included as discontinued operations in the condensed consolidated statements of comprehensive income during the three and nine months ended September 30, 2022.

Other Income, Net

9 Months Ended

Sep. 30, 2023

Other Income, Net

Note 16 — Other Income, Net

Other income, net consists of the following:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2023			2022			2023			2022
Gain/(loss) on disposal of operations (i)	$	41		$	21		$	44		$	(11	)
Net periodic pension and postretirement benefit credits		29			64			82			204
Interest in earnings of associates and other investments		1			—			3			4
Foreign exchange (loss)/gain (ii)		(3	)		(1	)		(7	)		4
Other		(2	)		1			4			4
Other income, net	$	66		$	85		$	126		$	205

(i)

For the nine months ended September 30, 2022, includes a $24 million non-cash revaluation gain related to an acquisition completed in stages.

(ii)

Includes the offsetting effects of the Company's foreign currency hedging program. See Note 9 — Derivative Financial Instruments.

Restructuring Costs - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]
Transaction and transformation	$ 113	$ 50	$ 265	$ 108
Transformation Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, description			the Company initiated a three-year ‘Transformation program’ designed to enhance operations, optimize technology and align its real estate footprint to its new ways of working
Restructuring, Expected future effects	900
Transaction and transformation	104	$ 42	$ 231	$ 73
Transformation Program [Member] \| Projected Annual Cost Savings by End of 2024 [Member]
Restructuring Cost and Reserve [Line Items]
Annual cost savings of program	380
Transformation Program [Member] \| Cumulative Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, Expected future effects	630
Transformation Program [Member] \| Capital Expenditures [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, Expected future effects	$ 270

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Fair Value Measurements - Schedule of Liabilities Whose Carrying Values Differ from the Fair Value and are Not Measured on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current debt	$ 649	$ 250
Long-term debt	4,565	4,471
Carrying Value [Member] \| Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term note receivable	70	68
Current debt	649	250
Long-term debt	4,565	4,471
Fair Value [Member] \| Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term note receivable	62	63
Current debt	640	248
Long-term debt	$ 4,066	$ 4,069

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ 136	$ 190	$ 433	$ 421

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481687/323-10-50-3

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-28

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482765/220-10-50-6

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483443/250-10-50-3

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483443/250-10-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480175/815-40-65-1

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483443/250-10-50-8

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483443/250-10-50-9

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483443/250-10-50-11

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483443/250-10-50-11

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483443/250-10-50-4

Reference 13: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 830
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480167/946-830-55-10

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section 45
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483581/946-220-45-7

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(18))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(9))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(1)(d))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(i))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1A

Reference 20: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(ii))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1A

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iii)(A))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1A

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iv))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1A

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(5))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1A

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(i))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1B

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(A))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1B

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(B))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1B

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iv))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1B

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(5))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1B

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-30

Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 31: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 60B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482689/260-10-45-60B

Reference 32: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-31

Reference 33: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 34: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483499/205-20-50-7

Reference 35: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 36: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-1A

Reference 37: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-1B

Reference 38: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(20))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

Reference 39: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(22))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1

Revenue - Schedule of Disaggregation of Revenue (Parenthetical) (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2023

Sep. 30, 2022

Sep. 30, 2023

Sep. 30, 2022

^[1]

$ 42

$ 34

$ 124

$ 101

Corporate

Corporate | Fiduciary assets

^[1],[2]

$ 8

$ 39

$ 9

[1]

[2]

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Restructuring and Related Activities [Abstract]

Supplementary Information for Certain Balance Sheet Accounts - Prepaid and Other Current Assets (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepayments and accrued income	$ 135	$ 132
Deferred contract costs	72	71
Derivatives and investments	0	43
Deferred compensation plan assets	13	16
Corporate income and other taxes	202	89
Acquired renewal commissions receivable	8	9
Other current assets	39	54
Total prepaid and other current assets	$ 469	$ 414

Restructuring Costs (Tables)

9 Months Ended

Sep. 30, 2023

Summary of Total Restructuring Costs

An analysis of total restructuring costs incurred under the Transformation program by category and by segment and corporate functions, from commencement to September 30, 2023, is as follows:


	HWC		R&B		Corporate		Total
2021
Real estate rationalization	$	—	$	—	$	19	$	19
Technology modernization		—		5		—		5
Process optimization		—		—		—		—
Other		—		—		2		2
2022
Real estate rationalization		—		—		79		79
Technology modernization		—		3		16		19
Process optimization		1		—		—		1
Other		—		—		—		—
2023
Real estate rationalization		—		—		29		29
Technology modernization		—		—		1		1
Process optimization		—		—		—		—
Other		—		—		—		—
Total
Real estate rationalization		—		—		127		127
Technology modernization		—		8		17		25
Process optimization		1		—		—		1
Other		—		—		2		2
Total	$	1	$	8	$	146	$	155

Rollforward of Liability Associated with Cash-based Charges

A rollforward of the liability associated with cash-based charges related to restructuring costs associated with the Transformation program is as follows:


	Real estate rationalization			Technology modernization		Process optimization			Other			Total
Balance at October 1, 2021	$	—		$	—	$	—		$	—		$	—
Charges incurred		—			—		—			2			2
Cash payments		—			—		—			(1	)		(1	)
Balance at December 31, 2021		—			—		—			1			1
Charges incurred		27			—		1			—			28
Cash payments		(21	)		—		(1	)		(1	)		(23	)
Balance at December 31, 2022		6			—		—			—			6
Charges incurred		11			—		—			—			11
Cash payments		(14	)		—		—			—			(14	)
Balance at September 30, 2023	$	3		$	—	$	—		$	—		$	3

Leases (Tables)

9 Months Ended

Sep. 30, 2023

Leases [Abstract]

Schedule of Lease Costs Recorded in Condensed Consolidated Statements of Comprehensive Income

The following tables present lease costs recorded on our condensed consolidated statements of comprehensive income for the three and nine months ended September 30, 2023 and 2022:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2023			2022			2023			2022
Finance lease cost:
Amortization of right-of-use assets	$	—		$	—		$	1		$	1
Interest on lease liabilities		—			1			1			2
Operating lease cost		43			35			114			130
Short-term lease cost		1			—			1			—
Variable lease cost		11			13			39			47
Sublease income		(3	)		(3	)		(9	)		(12	)
Total lease cost, net	$	52		$	46		$	147		$	168

Revenue (Tables)

9 Months Ended

Sep. 30, 2023

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following tables present revenue by service offering and segment, as well as reconciliations to total revenue for the three and nine months ended September 30, 2023 and 2022. Along with reimbursable expenses and other, total revenue by service offering represents our revenue from customer contracts.


	Three Months Ended September 30,
	HWC				R&B				Corporate (i) (ii)						Total
	2023		2022		2023		2022		2023			2022			2023		2022
Broking	$	241	$	207	$	673	$	606	$	—		$	1		$	914	$	814
Consulting		643		616		88		85		4			2			735		703
Outsourced administration		272		222		21		18		—			—			293		240
Other		119		111		46		38		—			—			165		149
Total revenue by service offering		1,275		1,156		828		747		4			3			2,107		1,906
Reimbursable expenses and other (i) (ii)		16		16		3		2		(2	)		(5	)		17		13
Total revenue from customer contracts	$	1,291	$	1,172	$	831	$	749	$	2		$	(2	)	$	2,124	$	1,919
Interest and other income (ii)		7		6		27		18		8			10			42		34
Total revenue	$	1,298	$	1,178	$	858	$	767	$	10		$	8		$	2,166	$	1,953


	Nine Months Ended September 30,
	HWC				R&B				Corporate (i) (ii)					Total
	2023		2022		2023		2022		2023		2022			2023		2022
Broking	$	789	$	714	$	2,088	$	1,963	$	8	$	8		$	2,885	$	2,685
Consulting		1,947		1,886		273		280		12		7			2,232		2,173
Outsourced administration		779		696		67		61		—		—			846		757
Other		247		237		168		147		—		—			415		384
Total revenue by service offering		3,762		3,533		2,596		2,451		20		15			6,378		5,999
Reimbursable expenses and other (i) (ii)		49		43		9		7		9		(6	)		67		44
Total revenue from customer contracts	$	3,811	$	3,576	$	2,605	$	2,458	$	29	$	9		$	6,445	$	6,043
Interest and other income (ii)		22		32		63		57		39		12			124		101
Total revenue	$	3,833	$	3,608	$	2,668	$	2,515	$	68	$	21		$	6,569	$	6,144

(i)

(ii)

Interest and other income is included in segment revenue and total revenue, however it has been presented separately in the above tables because it does not arise directly from contracts with customers. The significant components of interest and other income are as follows for the periods presented above:


	Three Months Ended September 30,
	HWC				R&B				Corporate				Total
	2023		2022		2023		2022		2023		2022		2023		2022
Book-of-business settlements	$	—	$	1	$	1	$	11	$	—	$	—	$	1	$	12
Interest income		7		2		25		6		7		9		39		17
Other income		—		3		1		1		1		1		2		5
Total interest and other income	$	7	$	6	$	27	$	18	$	8	$	10	$	42	$	34


	Nine Months Ended September 30,
	HWC				R&B				Corporate				Total
	2023		2022		2023		2022		2023		2022		2023		2022
Book-of-business settlements	$	—	$	19	$	11	$	41	$	—	$	—	$	11	$	60
Interest income		18		4		52		15		36		9		106		28
Other income		4		9		—		1		3		3		7		13
Total interest and other income	$	22	$	32	$	63	$	57	$	39	$	12	$	124	$	101

As a result of the cessation of the co-broking agreement, (see Note 3 — Acquisitions and Divestitures) interest income associated with fiduciary funds will be allocated more directly to the Risk and Broking segment beginning in the third quarter of 2023. These amounts were previously allocated to the Corporate segment following the disposal of Willis Re.

The following tables present revenue from service offerings by the geography where our work was performed for the three and nine months ended September 30, 2023 and 2022. Reconciliations to total revenue on our condensed consolidated statements of comprehensive income and to segment revenue are shown in the tables above.


	Three Months Ended September 30,
	HWC				R&B				Corporate				Total
	2023		2022		2023		2022		2023		2022		2023		2022
North America	$	830	$	766	$	344	$	326	$	3	$	2	$	1,177	$	1,094
Europe		330		285		354		297		1		1		685		583
International		115		105		130		124		—		—		245		229
Total revenue by geography	$	1,275	$	1,156	$	828	$	747	$	4	$	3	$	2,107	$	1,906


	Nine Months Ended September 30,
	HWC				R&B				Corporate				Total
	2023		2022		2023		2022		2023		2022		2023		2022
North America	$	2,445	$	2,301	$	990	$	936	$	6	$	6	$	3,441	$	3,243
Europe		991		931		1,214		1,128		12		8		2,217		2,067
International		326		301		392		387		2		1		720		689
Total revenue by geography	$	3,762	$	3,533	$	2,596	$	2,451	$	20	$	15	$	6,378	$	5,999

Contract with Customer, Asset and Liability

The Company reports accounts receivable, net on the condensed consolidated balance sheets, which includes billed and unbilled receivables and current contract assets. In addition to accounts receivable, net, the Company had the following non-current contract assets and deferred revenue balances at September 30, 2023 and December 31, 2022:


	September 30, 2023		December 31, 2022
Billed receivables, net of allowance for doubtful accounts of $41 million and $46 million	$	1,296	$	1,464
Unbilled receivables		514		457
Current contract assets		269		466
Accounts receivable, net	$	2,079	$	2,387
Non-current accounts receivable, net	$	8	$	9
Non-current contract assets	$	803	$	745
Deferred revenue	$	666	$	646

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction

In addition, in accordance with ASC 606, Revenue From Contracts With Customers (‘ASC 606’), the Company has elected not to disclose the remaining performance obligations when one or both of the following circumstances apply:

•

Performance obligations which are part of a contract that has an original expected duration of less than one year, and

•

Performance obligations satisfied in accordance with ASC 606-10-55-18 (‘right to invoice’).


	Remainder of 2023		2024		2025 onward		Total
Revenue expected to be recognized on contracts as of September 30, 2023	$	213	$	470	$	704	$	1,387

Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2023

Sep. 30, 2022

Sep. 30, 2023

Sep. 30, 2022

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Stockholders' equity attributable to parent, beginning balance

$ 10,016

Stockholders' equity attributable to parent, ending balance

$ 9,410

9,410

Foreign currency translation [Member]

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Stockholders' equity attributable to parent, beginning balance

^[1]

(926)

$ (794)

(987)

$ (489)

Other comprehensive (loss)/income before reclassifications

^[1]

(85)

(240)

(24)

(545)

(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax)

^[1]

Net current-period other comprehensive (loss)/income

^[1]

(85)

(240)

(24)

(545)

Stockholders' equity attributable to parent, ending balance

^[1]

(1,011)

(1,034)

(1,011)

(1,034)

Derivative instruments [Member]

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Stockholders' equity attributable to parent, beginning balance

^[1]

Other comprehensive (loss)/income before reclassifications

^[1]

(2)

(5)

(8)

(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax)

^[1]

(1)

Net current-period other comprehensive (loss)/income

^[1]

(2)

(4)

(9)

Stockholders' equity attributable to parent, ending balance

^[1]

Defined pension and post-retirement benefit costs [Member]

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Stockholders' equity attributable to parent, beginning balance

^[2]

(1,626)

(1,698)

(1,643)

(1,708)

Other comprehensive (loss)/income before reclassifications

^[2]

(1)

(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax)

^[2]

Net current-period other comprehensive (loss)/income

^[2]

Stockholders' equity attributable to parent, ending balance

^[2]

(1,619)

(1,688)

(1,619)

(1,688)

Total [Member]

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Stockholders' equity attributable to parent, beginning balance

(2,540)

(2,486)

(2,621)

(2,186)

Other comprehensive (loss)/income before reclassifications

(88)

(240)

(24)

(550)

(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax)

Net current-period other comprehensive (loss)/income

(80)

(234)

(534)

Stockholders' equity attributable to parent, ending balance

$ (2,620)

$ (2,720)

$ (2,620)

$ (2,720)

[1]	Reclassification adjustments from accumulated other comprehensive loss related to derivative instruments are included in Revenue and Salaries and benefits in the accompanying condensed consolidated statements of comprehensive income. See Note 9 — Derivative Financial Instruments for additional details regarding the reclassification adjustments for the derivative settlements.
[2]	Reclassification adjustments from accumulated other comprehensive loss are included in the computation of net periodic pension cost (see Note 12 — Retirement Benefits). These components are included in Other income, net in the accompanying condensed consolidated statements of comprehensive income.

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481372/852-10-55-10

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 830
-Name Accounting Standards Codification
-Section 55
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480167/946-830-55-12

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(19))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.6-05(4))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479617/946-210-S99-2

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(4)(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(6))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(7))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481687/323-10-50-3

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-28

Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(31))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 14: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 4.E)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480418/310-10-S99-2

Supplementary Information for Certain Balance Sheet Accounts - Other Current Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Dividends payable	$ 104	$ 102
Income taxes payable	51	83
Interest payable	41	49
Deferred compensation plan liabilities	13	14
Contingent and deferred consideration on acquisitions	17	17
Accrued retirement benefits	32	32
Payroll and other benefits-related liabilities	235	225
Derivatives	3	4
Third-party commissions	99	124
Other current liabilities	35	66
Total other current liabilities	$ 630	$ 716

Revenue - Schedule of Components of Interest and Other Income (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2023

Sep. 30, 2022

Sep. 30, 2023

Sep. 30, 2022

$ 1

$ 12

$ 11

$ 60

106

^[1]

124

101

HWC [Member]

^[1]

R&B [Member]

^[1]

Corporate, Non-Segment

$ 8

$ 10

$ 39

$ 12

[1]

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Other Income and Expenses [Abstract]

Other Income, Net (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2023

Sep. 30, 2022

Sep. 30, 2023

Sep. 30, 2022

Gain/(loss) on disposal of operations

^[1]

$ 41

$ 21

$ 44

$ (11)

Net periodic pension and postretirement benefit credits

204

Interest in earnings of associates and other investments

Foreign exchange (loss)/gain

^[2]

(3)

(1)

(7)

Other

(2)

Other income, net

$ 66

$ 85

$ 126

$ 205

[1]	For the nine months ended September 30, 2022, includes a $24 million non-cash revaluation gain related to an acquisition completed in stages.
[2]	Includes the offsetting effects of the Company's foreign currency hedging program. See Note 9 — Derivative Financial Instruments.

Supplementary Information for Certain Balance Sheet Accounts - Schedule of Other Non-current Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred compensation plan liability	$ 73	$ 74
Contingent and deferred consideration on acquisitions	23	29
Liabilities for uncertain tax positions	34	40
Finance leases	8	12
Other non-current liabilities	62	66
Total other non-current liabilities	$ 200	$ 221

Accumulated Other Comprehensive Loss

9 Months Ended

Sep. 30, 2023

Equity [Abstract]

Accumulated Other Comprehensive Loss

Note 17 — Accumulated Other Comprehensive Loss

Changes in accumulated other comprehensive loss, net of non-controlling interests, and net of tax are provided in the following tables for the three and nine months ended September 30, 2023 and 2022. This table excludes amounts attributable to non-controlling interests, which are not material for further disclosure.


	Foreign currency translation (i)						Derivative instruments (i)						Defined pension and post-retirement benefit costs (ii)						Total
	2023			2022			2023			2022			2023			2022			2023			2022
Quarter-to-date activity:
Balance at June 30, 2023 and 2022, respectively	$	(926	)	$	(794	)	$	12		$	6		$	(1,626	)	$	(1,698	)	$	(2,540	)	$	(2,486	)
Other comprehensive (loss)/income before reclassifications		(85	)		(240	)		(2	)		(5	)		(1	)		5			(88	)		(240	)
Loss reclassified from accumulated other comprehensive loss (net of income tax benefit of $2 and $2 at both periods)		—			—			—			1			8			5			8			6
Net current-period other comprehensive (loss)/income		(85	)		(240	)		(2	)		(4	)		7			10			(80	)		(234	)
Balance at September 30, 2023 and 2022, respectively	$	(1,011	)	$	(1,034	)	$	10		$	2		$	(1,619	)	$	(1,688	)	$	(2,620	)	$	(2,720	)

Year-to-date activity:
Balance at December 31, 2022 and 2021, respectively	$	(987	)	$	(489	)	$	9		$	11		$	(1,643	)	$	(1,708	)	$	(2,621	)	$	(2,186	)
Other comprehensive (loss)/income before reclassifications		(24	)		(545	)		1			(8	)		(1	)		3			(24	)		(550	)
(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax benefit of $8 and $6, respectively)		—			—			—			(1	)		25			17			25			16
Net current-period other comprehensive (loss)/income		(24	)		(545	)		1			(9	)		24			20			1			(534	)
Balance at September 30, 2023 and 2022, respectively	$	(1,011	)	$	(1,034	)	$	10		$	2		$	(1,619	)	$	(1,688	)	$	(2,620	)	$	(2,720	)

(i)

Reclassification adjustments from accumulated other comprehensive loss related to derivative instruments are included in Revenue and Salaries and benefits in the accompanying condensed consolidated statements of comprehensive income. See Note 9 — Derivative Financial Instruments for additional details regarding the reclassification adjustments for the derivative settlements.

(ii)

Reclassification adjustments from accumulated other comprehensive loss are included in the computation of net periodic pension cost (see Note 12 — Retirement Benefits). These components are included in Other income, net in the accompanying condensed consolidated statements of comprehensive income.

Leases - Schedule of Lease Costs Recorded in Condensed Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Finance lease cost:
Amortization of right-of-use assets	$ 0	$ 0	$ 1	$ 1
Interest on lease liabilities	0	1	1	2
Operating lease cost	43	35	114	130
Short-term lease cost	1	0	1	0
Variable lease cost	11	13	39	47
Sublease income	(3)	(3)	(9)	(12)
Total lease cost, net	$ 52	$ 46	$ 147	$ 168

Debt

9 Months Ended

Sep. 30, 2023

Debt Disclosure [Abstract]

Debt

Note 10 — Debt

Current debt consists of the following:


	September 30, 2023		December 31, 2022
4.625% senior notes due 2023	$	—	$	250
3.600% senior notes due 2024		649		—
	$	649	$	250

Long-term debt consists of the following:


	September 30, 2023		December 31, 2022
Revolving $1.5 billion credit facility	$	—	$	—
3.600% senior notes due 2024		—		649
4.400% senior notes due 2026		548		547
4.650% senior notes due 2027		744		744
4.500% senior notes due 2028		597		597
2.950% senior notes due 2029		726		726
5.350% senior notes due 2033		741		—
6.125% senior notes due 2043		272		271
5.050% senior notes due 2048		395		395
3.875% senior notes due 2049		542		542
	$	4,565	$	4,471

Senior Notes

On May 17, 2023, the Company, together with its wholly-owned subsidiary, Willis North America Inc. as issuer, completed an offering of $750 million aggregate principal amount of 5.350% senior notes due 2033 (‘2033 senior notes’). The effective interest rate of the 2033 senior notes is 5.47%, which includes the impact of the discount upon issuance. The 2033 senior notes will mature on May 15, 2033. Interest on the 2033 senior notes accrues from May 17, 2023 and will be paid in cash on May 15 and November 15 of each year, commencing on November 15, 2023. The net proceeds from this offering, after deducting the underwriting discount and offering expenses, were $741 million, of which $256 million was used to fully repay the $250 million aggregate principal amount and related accrued interest of the 4.625% senior notes at maturity during the third quarter of 2023. The Company will use the remaining net proceeds for general corporate purposes.

Revolving Credit Facility

On June 29, 2023, Trinity Acquisition plc amended its revolving credit facility to replace the use of London Interbank Offered Rate (‘LIBOR’) with the Secured Overnight Financing Rate (‘SOFR’) in connection with its base-rate borrowings. This amendment was done in connection with the cessation of LIBOR and all other terms remain the same.

At September 30, 2023 and December 31, 2022, we were in compliance with all financial covenants.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(c))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 470
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//470/tableOfContent

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1C
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1C
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1C
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1E
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1E

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

Fair Value Measurements

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note 11 — Fair Value Measurements

The Company has categorized its assets and liabilities that are measured at fair value on a recurring and non-recurring basis into a three-level fair value hierarchy, based on the reliability of the inputs used to determine fair value as follows:

•

Level 1: refers to fair values determined based on quoted market prices in active markets for identical assets;

•

Level 2: refers to fair values estimated using observable market-based inputs or unobservable inputs that are corroborated by market data; and

•

Level 3: includes fair values estimated using unobservable inputs that are not corroborated by market data.

The following methods and assumptions were used by the Company in estimating its fair value disclosure for financial instruments:

•

Mutual funds and exchange-traded funds are classified as Level 1 because we use quoted market prices in active markets in determining the fair value of these securities.

•

Commingled funds are not leveled within the fair value hierarchy as the funds are valued at the net value of shares held as reported by the manager of the funds. These funds are not exchange-traded.

•

Hedge funds are not leveled within the fair value hierarchy as the fair values for these investments are estimated based on the net asset values derived from the latest audited financial statements or most recent capital account statements provided by the funds’ investment manager or third-party administrator, as a practical expedient.

•

Market values for our derivative instruments have been used to determine the fair values of forward foreign exchange contracts based on estimated amounts the Company would receive or have to pay to terminate the agreements, taking into account observable information about the current foreign currency forward rates. Such financial instruments are classified as Level 2.

•

Contingent consideration payable is classified as Level 3, and we estimate fair value based on the likelihood and timing of achieving the relevant milestones of each arrangement, applying a probability assessment to each of the potential outcomes, which at times includes the use of a Monte Carlo simulation and discounting the probability-weighted payout. Typically, milestones are based on revenue or earnings growth for the acquired business.

The following tables present our assets and liabilities measured at fair value on a recurring basis at September 30, 2023 and December 31, 2022:


		Fair Value Measurements on a Recurring Basis at September 30, 2023
	Balance Sheet Location	Level 1		Level 2		Level 3		Total
Assets:
Available-for-sale securities:
Mutual funds / exchange-traded funds (i)	Prepaid and other current assets and other non-current assets	$	96	$	—	$	—	$	96
	Fiduciary assets		184		—		—		184
Commingled funds (i) (ii)	Other non-current assets		—		—		—		8
Hedge funds (i) (iii)	Other non-current assets		—		—		—		8
Derivatives:
Derivative financial instruments (iv)	Prepaid and other current assets and other non-current assets	$	—	$	1	$	—	$	1
Liabilities:
Contingent consideration:
Contingent consideration (v) (vi)	Other current liabilities and other non-current liabilities	$	—	$	—	$	40	$	40
Derivatives:
Derivative financial instruments (iv)	Other current liabilities and other non-current liabilities	$	—	$	3	$	—	$	3


		Fair Value Measurements on a Recurring Basis at December 31, 2022
	Balance Sheet Location	Level 1		Level 2		Level 3		Total
Assets:
Available-for-sale securities:
Mutual funds / exchange-traded funds	Prepaid and other current assets and other non-current assets	$	7	$	—	$	—	$	7
	Fiduciary assets		142		—		—		142
Derivatives:
Derivative financial instruments (iv)	Prepaid and other current assets and other non-current assets	$	—	$	26	$	—	$	26
Liabilities:
Contingent consideration:
Contingent consideration (v) (vi)	Other current liabilities and other non-current liabilities	$	—	$	—	$	40	$	40
Derivatives:
Derivative financial instruments (iv)	Other current liabilities and other non-current liabilities	$	—	$	5	$	—	$	5

(i)

With the exception of the funds included in fiduciary assets, the majority of these balances are held as part of deferred compensation plans with related liabilities in other current liabilities and other non-current liabilities on the condensed consolidated balance sheets.

(ii)

Consists of the Towers Watson Global Equity Focus Fund, for which redemptions can occur on any business day, and require a minimum of one business day’s notice.

(iii)

Consists of the Towers Watson Alternative Credit Fund, for which the redemption period is generally quarterly, however requires a 50-day notice.

(iv)

See Note 9 — Derivative Financial Instruments for further information on our derivative investments.

(v)

Probability weightings are based on our knowledge of the past and planned performance of the acquired entity to which the contingent consideration applies. The fair value weighted-average discount rates used in our material contingent consideration calculations were 10.05% and 10.26% at September 30, 2023 and December 31, 2022, respectively. The range of these discount rates was 3.53% - 13.80% at September 30, 2023. Using different probability weightings and discount rates could result in an increase or decrease of the contingent consideration payable.

(vi)

Consideration due to be paid across multiple years until 2027.

The following table summarizes the change in fair value of the Level 3 liabilities:


Fair Value Measurements Using Significant Unobservable Inputs (Level 3)	September 30, 2023
Balance at December 31, 2022	$	40
Obligations assumed		—
Payments		(2	)
Realized and unrealized losses (i)		3
Foreign exchange		(1	)
Balance at September 30, 2023	$	40

(i)

Realized and unrealized losses include accretion and adjustments to contingent consideration liabilities, which are included within Interest expense and Other operating expenses, respectively, on the condensed consolidated statements of comprehensive income.

There were no significant transfers to or from Level 3 in the nine months ended September 30, 2023.

Fair value information about financial instruments not measured at fair value

The following tables present our liabilities not measured at fair value on a recurring basis at September 30, 2023 and December 31, 2022:


	September 30, 2023				December 31, 2022
	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Long-term note receivable	$	70	$	62	$	68	$	63
Liabilities:
Current debt	$	649	$	640	$	250	$	248
Long-term debt	$	4,565	$	4,066	$	4,471	$	4,069

The carrying value of our revolving credit facility approximates its fair value. The fair values above, which exclude accrued interest, are not necessarily indicative of the amounts that the Company would realize upon disposition, nor do they indicate the Company’s intent or ability to dispose of the financial instruments. The fair values of our respective senior notes and long-term note receivable are considered Level 2 financial instruments as they are corroborated by observable market data.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

Revenue - Schedule of Revenue by Geography (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,124	$ 1,919	$ 6,445	$ 6,043
Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,107	1,906	6,378	5,999
Operating Segments [Member] \| Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,107	1,906	6,378	5,999
Corporate, Non-Segment \| Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4	3	20	15
HWC [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,291	1,172	3,811	3,576
HWC [Member] \| Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,275	1,156	3,762	3,533
HWC [Member] \| Operating Segments [Member] \| Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,275	1,156	3,762	3,533
R&B [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	831	749	2,605	2,458
R&B [Member] \| Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	828	747	2,596	2,451
R&B [Member] \| Operating Segments [Member] \| Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	828	747	2,596	2,451
North America [Member] \| Operating Segments [Member] \| Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,177	1,094	3,441	3,243
North America [Member] \| Corporate, Non-Segment \| Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3	2	6	6
North America [Member] \| HWC [Member] \| Operating Segments [Member] \| Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	830	766	2,445	2,301
North America [Member] \| R&B [Member] \| Operating Segments [Member] \| Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	344	326	990	936
Europe [Member] \| Operating Segments [Member] \| Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	685	583	2,217	2,067
Europe [Member] \| Corporate, Non-Segment \| Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1	1	12	8
Europe [Member] \| HWC [Member] \| Operating Segments [Member] \| Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	330	285	991	931
Europe [Member] \| R&B [Member] \| Operating Segments [Member] \| Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	354	297	1,214	1,128
International [Member] \| Operating Segments [Member] \| Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	245	229	720	689
International [Member] \| Corporate, Non-Segment \| Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	2	1
International [Member] \| HWC [Member] \| Operating Segments [Member] \| Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	115	105	326	301
International [Member] \| R&B [Member] \| Operating Segments [Member] \| Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 130	$ 124	$ 392	$ 387

Insider Trading Arrangements	9 Months Ended
Insider Trading Arrangements	Sep. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Segment Information - Reconciliation of Information Reported by Segment to Condensed Consolidated Statement of Comprehensive Income Amounts (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2023

Sep. 30, 2022

Mar. 31, 2022

Sep. 30, 2023

Sep. 30, 2022

Revenue:

Income/(loss) from operations

$ 2,166

$ 1,953

$ 6,569

$ 6,144

159

154

586

470

Impairment

$ (81)

(81)

Amortization

(62)

(71)

(203)

(239)

Restructuring costs

(17)

(9)

(30)

(71)

Interest expense

(61)

(54)

(172)

(154)

Other income, net

126

205

Income from continuing operations before income taxes

164

185

540

521

Operating Segments [Member]

Revenue:

Income/(loss) from operations

2,137

1,927

6,443

6,073

439

341

1,295

1,175

Segment Reconciling Items [Member]

Revenue:

Income/(loss) from operations

126

159

154

586

470

Impairment

^[1]

(81)

Amortization

(62)

(71)

(203)

(239)

Restructuring costs

^[2]

(17)

(9)

(30)

(71)

Transaction and transformation

^[3]

(113)

(50)

(265)

(108)

Unallocated, net

^[4]

(88)

(57)

(211)

(206)

Interest expense

(61)

(54)

(172)

(154)

Other income, net

$ 66

$ 85

$ 126

$ 205

[1]	Represents the impairment related to the net assets of our Russian business that are held outside of our Russian entities (see Note 3 — Acquisitions and Divestitures for further information).
[2]	See Note 6 — Restructuring Costs for the composition of costs for 2023 and 2022.
[3]	In 2023 and 2022, in addition to legal fees and other transaction costs, includes primarily consulting fees and compensation costs related to the Transformation program (see Note 6 — Restructuring Costs).
[4]	Includes certain costs, primarily related to corporate functions which are not directly related to the segments, and certain differences between budgeted expenses determined at the beginning of the year and actual expenses that we report for U.S. GAAP purposes.

Restructuring Costs

9 Months Ended

Sep. 30, 2023

Restructuring and Related Activities [Abstract]

Restructuring Costs

Note 6 — Restructuring Costs

In the fourth quarter of 2021, the Company initiated a three-year ‘Transformation program’ designed to enhance operations, optimize technology and align its real estate footprint to its new ways of working. During the second quarter of 2023, we revised the expected costs and savings under the program and we now expect the program to generate annual cost savings in excess of $380 million by the end of 2024. The program is expected to incur cumulative costs of approximately $630 million and capital expenditures of approximately $270 million, for a total investment of $900 million. The main categories of charges will be in the following four areas:

•

Real estate rationalization — includes costs to align the real estate footprint to the new ways of working (hybrid work) and includes breakage fees and the impairment of right-of-use (‘ROU’) assets and other related leasehold assets.

•

Technology modernization — these charges are incurred in moving to common platforms and technologies, including migrating certain platforms and applications to the cloud. This category will include the impairment of technology assets that are duplicative or no longer revenue-producing, as well as costs for technology investments that do not qualify for capitalization.

•

Process optimization — these costs will be incurred in the right-shoring strategy and automation of our operations, which will include optimizing resource deployment and appropriate colleague alignment. These costs will include process and organizational design costs, severance and separation-related costs and temporary retention costs.

•

Other — other costs not included above including fees for professional services, other contract terminations not related to the above categories and supplier migration costs.

Certain costs under the Transformation program are accounted for under ASC 420, Exit or Disposal Cost Obligation, and are included as restructuring costs in the condensed consolidated statements of comprehensive income. Other costs incurred under the Transformation program are included in transaction and transformation and were $104 million and $231 million during the three and nine months ended September 30, 2023, respectively, and $42 million and $73 million during the three and nine months ended

September 30, 2022, respectively. An analysis of total restructuring costs incurred under the Transformation program by category and by segment and corporate functions, from commencement to September 30, 2023, is as follows:


	HWC		R&B		Corporate		Total
2021
Real estate rationalization	$	—	$	—	$	19	$	19
Technology modernization		—		5		—		5
Process optimization		—		—		—		—
Other		—		—		2		2
2022
Real estate rationalization		—		—		79		79
Technology modernization		—		3		16		19
Process optimization		1		—		—		1
Other		—		—		—		—
2023
Real estate rationalization		—		—		29		29
Technology modernization		—		—		1		1
Process optimization		—		—		—		—
Other		—		—		—		—
Total
Real estate rationalization		—		—		127		127
Technology modernization		—		8		17		25
Process optimization		1		—		—		1
Other		—		—		2		2
Total	$	1	$	8	$	146	$	155

A rollforward of the liability associated with cash-based charges related to restructuring costs associated with the Transformation program is as follows:


	Real estate rationalization			Technology modernization		Process optimization			Other			Total
Balance at October 1, 2021	$	—		$	—	$	—		$	—		$	—
Charges incurred		—			—		—			2			2
Cash payments		—			—		—			(1	)		(1	)
Balance at December 31, 2021		—			—		—			1			1
Charges incurred		27			—		1			—			28
Cash payments		(21	)		—		(1	)		(1	)		(23	)
Balance at December 31, 2022		6			—		—			—			6
Charges incurred		11			—		—			—			11
Cash payments		(14	)		—		—			—			(14	)
Balance at September 30, 2023	$	3		$	—	$	—		$	—		$	3

Retirement Benefits - Net Periodic Benefit Cost (Details) - Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 14	$ 20	$ 42	$ 58
Interest cost	48	29	146	88
Expected return on plan assets	(76)	(83)	(228)	(248)
Settlements	0	3	1	3
Amortization of net loss	3	4	9	11
Amortization of prior service credit	0	0	0	0
Net periodic benefit (income)/cost	(11)	(27)	(30)	(88)
United Kingdom [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	2	4	9
Interest cost	31	18	90	54
Expected return on plan assets	(41)	(34)	(121)	(110)
Settlements	0	1	0	1
Amortization of net loss	12	7	36	22
Amortization of prior service credit	(3)	(3)	(9)	(9)
Net periodic benefit (income)/cost	0	(9)	0	(33)
Other Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	6	11	17
Interest cost	7	4	21	12
Expected return on plan assets	(10)	(10)	(29)	(29)
Settlements	0	0	(1)	0
Amortization of net loss	0	0	0	2
Amortization of prior service credit	0	1	1	1
Net periodic benefit (income)/cost	$ 1	$ 1	$ 3	$ 3

Goodwill and Other Intangible Assets - Changes in the Net Carrying Amount of the Components of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	$ 5,586		$ 5,586		$ 5,621
Finite-lived intangible assets, accumulated amortization	(3,522)		(3,522)		(3,348)
Finite-lived intangible assets, net amount	2,064		2,064		2,273
Intangible assets acquired			7
Intangible asset disposals			(13)
Amortization	(62)	$ (71)	(203)	$ (239)
Client relationships [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	3,766		3,766		3,760
Finite-lived intangible assets, accumulated amortization	(2,437)		(2,437)		(2,282)
Finite-lived intangible assets, net amount	1,329		1,329		1,478
Intangible assets acquired			7
Intangible asset disposals			0
Amortization			(156)
Software [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	720		720		725
Finite-lived intangible assets, accumulated amortization	(716)		(716)		(712)
Finite-lived intangible assets, net amount	4		4		13
Intangible assets acquired			0
Intangible asset disposals			0
Amortization			(9)
Trademark and trade name [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	1,037		1,037		1,038
Finite-lived intangible assets, accumulated amortization	(329)		(329)		(298)
Finite-lived intangible assets, net amount	708		708		740
Intangible assets acquired			0
Intangible asset disposals			0
Amortization			(32)
Other [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	63		63		98
Finite-lived intangible assets, accumulated amortization	(40)		(40)		(56)
Finite-lived intangible assets, net amount	$ 23		23		$ 42
Intangible assets acquired			0
Intangible asset disposals			(13)
Amortization			$ (6)

Derivative Financial Instruments

9 Months Ended

Sep. 30, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Note 9 — Derivative Financial Instruments

We are exposed to certain foreign currency risks. Where possible, we identify exposures in our business that can be offset internally. Where no natural offset is identified, we may choose to enter into various derivative transactions. These instruments have the effect of reducing our exposure to unfavorable changes in foreign currency rates. The Company’s board of directors reviews and approves

policies for managing this risk as summarized below. Additional information regarding our derivative financial instruments can be found in Note 11 — Fair Value Measurements and Note 17 — Accumulated Other Comprehensive Loss.

Foreign Currency Risk

Certain non-U.S. subsidiaries receive revenue and incur expenses in currencies other than their functional currency, and as a result, the foreign subsidiary’s functional currency revenue and/or expenses will fluctuate as the currency rates change. Additionally, the forecast Pounds sterling expenses of our London brokerage market operations may exceed their Pounds sterling revenue, and the entity with such operations may also hold significant foreign currency asset or liability positions in the condensed consolidated balance sheets. To reduce such variability, we use foreign exchange contracts to hedge against this currency risk.

These derivatives were designated as hedging instruments and at September 30, 2023 and December 31, 2022 had total notional amounts of $106 million and $134 million, respectively, and had net fair value liabilities of $1 million and $3 million, respectively.

At September 30, 2023, the Company estimates, based on current exchange rates, there will be less than $1 million of net derivative losses on forward exchange rates reclassified from accumulated other comprehensive loss into earnings within the next twelve months as the forecast transactions affect earnings. At September 30, 2023, our longest outstanding maturity was 1.7 years.

The effects of the material derivative instruments that are designated as hedging instruments on the condensed consolidated statements of comprehensive income for the three and nine months ended September 30, 2023 and 2022 are below. Amounts pertaining to the ineffective portion of hedging instruments and those excluded from effectiveness testing were immaterial for the three and nine months ended September 30, 2023 and 2022.


	(Loss)/gain recognized in OCI (effective element)
	Three months ended September 30,						Nine months ended September 30,
	2023			2022			2023		2022
Forward exchange contracts	$	(2	)	$	(6	)	$	1	$	(12	)


Location of (loss)/gain reclassified from Accumulated OCL into income (effective element)	(Loss)/gain reclassified from Accumulated OCL into income (effective element)
	Three months ended September 30,					Nine months ended September 30,
	2023		2022			2023			2022
Revenue	$	—	$	—		$	—		$	1
Salaries and benefits		—		(2	)		(1	)		(1	)
	$	—	$	(2	)	$	(1	)	$	—

The Company engages in intercompany borrowing and lending between subsidiaries, primarily through its in-house banking operations which give rise to foreign exchange exposures. The Company mitigates these risks through the use of short-term foreign currency forward and swap transactions that offset the underlying exposure created when the borrower and lender have different functional currencies. These derivatives are not generally designated as hedging instruments, and at September 30, 2023 and December 31, 2022, we had notional amounts of $911 million and $1.7 billion, respectively. At September 30, 2023 and December 31, 2022, we had a net fair value liability of $1 million and a net fair value asset of $24 million, respectively. Such derivatives typically mature within three months.

The effects of derivatives that have not been designated as hedging instruments on the condensed consolidated statements of comprehensive income for the three and nine months ended September 30, 2023 and 2022 are as follows (see Note 16 — Other Income, Net for the net foreign currency impact on the Company’s condensed consolidated statements of comprehensive income which includes the results of the offset of underlying exposures):


		(Loss)/gain recognized in income
		Three Months Ended September 30,						Nine Months Ended September 30,
Derivatives not designated as hedging instruments:	Location of (loss)/gain recognized in income	2023			2022			2023		2022
Forward exchange contracts	Other income, net	$	(13	)	$	(182	)	$	3	$	(208	)

Supplemental Disclosures of Cash Flow Information

9 Months Ended

Sep. 30, 2023

Supplemental Cash Flow Elements [Abstract]

Supplemental Disclosures of Cash Flow Information

Note 19 — Supplemental Disclosures of Cash Flow Information

Supplemental disclosures regarding cash flow information are as follows:


	Nine months ended September 30,
	2023			2022
Supplemental disclosures of cash flow information:
Cash and cash equivalents	$	1,247		$	1,496
Fiduciary funds (included in fiduciary assets)		2,485			3,170
Cash and cash equivalents and fiduciary funds (included in current assets held for sale)		—			5
Total cash, cash equivalents and restricted cash	$	3,732		$	4,671

Increase/(decrease) in cash, cash equivalents and other restricted cash	$	5		$	(2,904	)
(Decrease)/increase in fiduciary funds		(940	)		174
Total (i)	$	(935	)	$	(2,730	)

(i)

Does not include the effect of exchange rate changes on cash, cash equivalents and restricted cash.

Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Revenue - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2023
Disaggregation Of Revenue [Line Items]
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 1	$ 8
June 30, 2023 [Member]
Disaggregation Of Revenue [Line Items]
Contract with Customer, Liability, Revenue Recognized	290
Dec 31, 2022 [Member]
Disaggregation Of Revenue [Line Items]
Contract with Customer, Liability, Revenue Recognized	$ 62	$ 447

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Revenue from Contract with Customer [Abstract]

Revenue

9 Months Ended

Sep. 30, 2023

Note 4 — Revenue

Disaggregation of Revenue

The Company reports revenue by segment in Note 5 — Segment Information. The following tables present revenue by service offering and segment, as well as reconciliations to total revenue for the three and nine months ended September 30, 2023 and 2022. Along with reimbursable expenses and other, total revenue by service offering represents our revenue from customer contracts.


	Three Months Ended September 30,
	HWC				R&B				Corporate (i) (ii)						Total
	2023		2022		2023		2022		2023			2022			2023		2022
Broking	$	241	$	207	$	673	$	606	$	—		$	1		$	914	$	814
Consulting		643		616		88		85		4			2			735		703
Outsourced administration		272		222		21		18		—			—			293		240
Other		119		111		46		38		—			—			165		149
Total revenue by service offering		1,275		1,156		828		747		4			3			2,107		1,906
Reimbursable expenses and other (i) (ii)		16		16		3		2		(2	)		(5	)		17		13
Total revenue from customer contracts	$	1,291	$	1,172	$	831	$	749	$	2		$	(2	)	$	2,124	$	1,919
Interest and other income (ii)		7		6		27		18		8			10			42		34
Total revenue	$	1,298	$	1,178	$	858	$	767	$	10		$	8		$	2,166	$	1,953


	Nine Months Ended September 30,
	HWC				R&B				Corporate (i) (ii)					Total
	2023		2022		2023		2022		2023		2022			2023		2022
Broking	$	789	$	714	$	2,088	$	1,963	$	8	$	8		$	2,885	$	2,685
Consulting		1,947		1,886		273		280		12		7			2,232		2,173
Outsourced administration		779		696		67		61		—		—			846		757
Other		247		237		168		147		—		—			415		384
Total revenue by service offering		3,762		3,533		2,596		2,451		20		15			6,378		5,999
Reimbursable expenses and other (i) (ii)		49		43		9		7		9		(6	)		67		44
Total revenue from customer contracts	$	3,811	$	3,576	$	2,605	$	2,458	$	29	$	9		$	6,445	$	6,043
Interest and other income (ii)		22		32		63		57		39		12			124		101
Total revenue	$	3,833	$	3,608	$	2,668	$	2,515	$	68	$	21		$	6,569	$	6,144

(i)

(ii)


	Three Months Ended September 30,
	HWC				R&B				Corporate				Total
	2023		2022		2023		2022		2023		2022		2023		2022
Book-of-business settlements	$	—	$	1	$	1	$	11	$	—	$	—	$	1	$	12
Interest income		7		2		25		6		7		9		39		17
Other income		—		3		1		1		1		1		2		5
Total interest and other income	$	7	$	6	$	27	$	18	$	8	$	10	$	42	$	34


	Nine Months Ended September 30,
	HWC				R&B				Corporate				Total
	2023		2022		2023		2022		2023		2022		2023		2022
Book-of-business settlements	$	—	$	19	$	11	$	41	$	—	$	—	$	11	$	60
Interest income		18		4		52		15		36		9		106		28
Other income		4		9		—		1		3		3		7		13
Total interest and other income	$	22	$	32	$	63	$	57	$	39	$	12	$	124	$	101


	Three Months Ended September 30,
	HWC				R&B				Corporate				Total
	2023		2022		2023		2022		2023		2022		2023		2022
North America	$	830	$	766	$	344	$	326	$	3	$	2	$	1,177	$	1,094
Europe		330		285		354		297		1		1		685		583
International		115		105		130		124		—		—		245		229
Total revenue by geography	$	1,275	$	1,156	$	828	$	747	$	4	$	3	$	2,107	$	1,906


	Nine Months Ended September 30,
	HWC				R&B				Corporate				Total
	2023		2022		2023		2022		2023		2022		2023		2022
North America	$	2,445	$	2,301	$	990	$	936	$	6	$	6	$	3,441	$	3,243
Europe		991		931		1,214		1,128		12		8		2,217		2,067
International		326		301		392		387		2		1		720		689
Total revenue by geography	$	3,762	$	3,533	$	2,596	$	2,451	$	20	$	15	$	6,378	$	5,999

Contract Balances


	September 30, 2023		December 31, 2022
Billed receivables, net of allowance for doubtful accounts of $41 million and $46 million	$	1,296	$	1,464
Unbilled receivables		514		457
Current contract assets		269		466
Accounts receivable, net	$	2,079	$	2,387
Non-current accounts receivable, net	$	8	$	9
Non-current contract assets	$	803	$	745
Deferred revenue	$	666	$	646

During the three and nine months ended September 30, 2023, revenue of $62 million and $447 million, respectively, was recognized that was reflected as deferred revenue at December 31, 2022. During the three months ended September 30, 2023, revenue of $290 million was recognized that was reflected as deferred revenue at June 30, 2023.

During the three and nine months ended September 30, 2023, the Company recognized revenue of $1 million and $8 million, respectively, related to performance obligations satisfied prior to 2023.

Performance Obligations

The Company has contracts for which performance obligations have not been satisfied as of September 30, 2023 or have been partially satisfied as of this date. The following table shows the expected timing for the satisfaction of the remaining performance obligations. This table does not include contract renewals or variable consideration, which was excluded from the transaction prices in accordance with the guidance on constraining estimates of variable consideration.

•

Performance obligations which are part of a contract that has an original expected duration of less than one year, and

•

Performance obligations satisfied in accordance with ASC 606-10-55-18 (‘right to invoice’).


	Remainder of 2023		2024		2025 onward		Total
Revenue expected to be recognized on contracts as of September 30, 2023	$	213	$	470	$	704	$	1,387

Since most of the Company’s contracts are cancellable with less than one year’s notice and have no substantive penalty for cancellation, the majority of the Company’s remaining performance obligations as of September 30, 2023 have been excluded from the table above.

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-9

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-10

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-15

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-13

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org//606/tableOfContent

Commitments and Contingencies Disclosure [Abstract]

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenue	$ 2,166	$ 1,953	$ 6,569	$ 6,144
Costs of providing services
Salaries and benefits	1,359	1,225	4,019	3,802
Other operating expenses	396	384	1,282	1,263
Depreciation	60	60	184	191
Amortization	62	71	203	239
Restructuring costs	17	9	30	71
Transaction and transformation	113	50	265	108
Total costs of providing services	2,007	1,799	5,983	5,674
Income from operations	159	154	586	470
Interest expense	(61)	(54)	(172)	(154)
Other income, net	66	85	126	205
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	164	185	540	521
Provision for income taxes	(25)	(1)	(99)	(63)
INCOME FROM CONTINUING OPERATIONS	139	184	441	458
INCOME/(LOSS) FROM DISCONTINUED OPERATIONS, NET OF TAX	0	8	0	(27)
NET INCOME	139	192	441	431
Income attributable to non-controlling interests	(3)	(2)	(8)	(10)
NET INCOME ATTRIBUTABLE TO WTW	$ 136	$ 190	$ 433	$ 421
Basic earnings per share:
Income from continuing operations per share	$ 1.3	$ 1.65	$ 4.08	$ 3.95
Income/(loss) from discontinued operations per share	0	0.07	0	(0.24)
Basic earnings per share	1.3	1.72	4.08	3.71
Diluted earnings per share:
Income from continuing operations per share	1.29	1.65	4.06	3.95
Income/(loss) from discontinued operations per share	0	0.07	0	(0.24)
Diluted earnings per share	$ 1.29	$ 1.72	$ 4.06	$ 3.71
Comprehensive income/(loss) before non-controlling interests	$ 61	$ (42)	$ 444	$ (103)
Comprehensive income attributable to non-controlling interests	(5)	(2)	(10)	(10)
Comprehensive income/(loss) attributable to WTW	$ 56	$ (44)	$ 434	$ (113)

Commitments and Contingencies

9 Months Ended

Sep. 30, 2023

Commitments and Contingencies

Note 14 — Commitments and Contingencies

Indemnification Agreements

WTW has various agreements which provide that it may be obligated to indemnify the other party to the agreement with respect to certain matters. Generally, these indemnification provisions are included in contracts arising in the normal course of business and in connection with the purchase and sale of certain businesses, including the disposal of Willis Re. It is not possible to predict the maximum potential amount of future payments that may become due under these indemnification agreements because of the conditional nature of the Company’s obligations and the unique facts of each particular agreement. However, we do not believe that any potential liability that may arise from such indemnity provisions is probable or material.

Legal Proceedings

In the ordinary course of business, the Company is subject to various actual and potential claims, lawsuits and other proceedings. Some of the claims, lawsuits and other proceedings seek damages in amounts which could, if assessed, be significant. The Company also receives subpoenas in the ordinary course of business and, from time to time, receives requests for information in connection with governmental investigations.

Errors and omissions claims, lawsuits, and other proceedings arising in the ordinary course of business are covered in part by professional indemnity or other appropriate insurance. The terms of this insurance vary by policy year. Regarding self-insured risks, the Company has established provisions which are believed to be adequate in light of current information and legal advice, or, in certain cases, where a range of loss exists, the Company accrues the minimum amount in the range if no amount within the range is a better estimate than any other amount. The Company adjusts such provisions from time to time according to developments. See Note 15 — Supplementary Information for Certain Balance Sheet Accounts for the amounts accrued at September 30, 2023 and December 31, 2022 in the condensed consolidated balance sheets.

On the basis of current information, the Company does not expect that the actual claims, lawsuits and other proceedings to which it is subject, or potential claims, lawsuits, and other proceedings relating to matters of which it is aware, will ultimately have a material adverse effect on its financial condition, results of operations or liquidity. Nonetheless, given the large or indeterminate amounts sought in certain of these actions, and the inherent unpredictability of litigation and disputes with insurance companies, it is possible that an adverse outcome or settlement in certain matters could, from time to time, have a material adverse effect on the Company’s results of operations or cash flows in a particular quarterly or annual period.

The Company provides for contingent liabilities based on ASC 450, Contingencies, when it is determined that a liability, inclusive of defense costs, is probable and reasonably estimable. The contingent liabilities recorded are primarily developed actuarially. Litigation

is subject to many factors which are difficult to predict so there can be no assurance that in the event of a material unfavorable result in one or more claims, we will not incur material costs.

Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2023

Designated [Member]

Schedule of Derivative Instruments Designated/Nondesignated As Hedging Instrument Effect on Condensed Consolidated Statements of Comprehensive Income


	(Loss)/gain recognized in OCI (effective element)
	Three months ended September 30,						Nine months ended September 30,
	2023			2022			2023		2022
Forward exchange contracts	$	(2	)	$	(6	)	$	1	$	(12	)


Location of (loss)/gain reclassified from Accumulated OCL into income (effective element)	(Loss)/gain reclassified from Accumulated OCL into income (effective element)
	Three months ended September 30,					Nine months ended September 30,
	2023		2022			2023			2022
Revenue	$	—	$	—		$	—		$	1
Salaries and benefits		—		(2	)		(1	)		(1	)
	$	—	$	(2	)	$	(1	)	$	—

Nondesignated [Member]

Schedule of Derivative Instruments Designated/Nondesignated As Hedging Instrument Effect on Condensed Consolidated Statements of Comprehensive Income


		(Loss)/gain recognized in income
		Three Months Ended September 30,						Nine Months Ended September 30,
Derivatives not designated as hedging instruments:	Location of (loss)/gain recognized in income	2023			2022			2023		2022
Forward exchange contracts	Other income, net	$	(13	)	$	(182	)	$	3	$	(208	)

Fair Value Measurements - Narrative (Details)	9 Months Ended
Fair Value Measurements - Narrative (Details)	Sep. 30, 2023 USD ($)
Fair Value Disclosures [Abstract]
Fair value significant transfers to or from Level 3	$ 0

Supplementary Information for Certain Balance Sheet Accounts - Provision For Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Claims, lawsuits and other proceedings	$ 302	$ 296
Other provisions	58	61
Total provision for liabilities	$ 360	$ 357

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis

The following tables present our assets and liabilities measured at fair value on a recurring basis at September 30, 2023 and December 31, 2022:


		Fair Value Measurements on a Recurring Basis at September 30, 2023
	Balance Sheet Location	Level 1		Level 2		Level 3		Total
Assets:
Available-for-sale securities:
Mutual funds / exchange-traded funds (i)	Prepaid and other current assets and other non-current assets	$	96	$	—	$	—	$	96
	Fiduciary assets		184		—		—		184
Commingled funds (i) (ii)	Other non-current assets		—		—		—		8
Hedge funds (i) (iii)	Other non-current assets		—		—		—		8
Derivatives:
Derivative financial instruments (iv)	Prepaid and other current assets and other non-current assets	$	—	$	1	$	—	$	1
Liabilities:
Contingent consideration:
Contingent consideration (v) (vi)	Other current liabilities and other non-current liabilities	$	—	$	—	$	40	$	40
Derivatives:
Derivative financial instruments (iv)	Other current liabilities and other non-current liabilities	$	—	$	3	$	—	$	3


		Fair Value Measurements on a Recurring Basis at December 31, 2022
	Balance Sheet Location	Level 1		Level 2		Level 3		Total
Assets:
Available-for-sale securities:
Mutual funds / exchange-traded funds	Prepaid and other current assets and other non-current assets	$	7	$	—	$	—	$	7
	Fiduciary assets		142		—		—		142
Derivatives:
Derivative financial instruments (iv)	Prepaid and other current assets and other non-current assets	$	—	$	26	$	—	$	26
Liabilities:
Contingent consideration:
Contingent consideration (v) (vi)	Other current liabilities and other non-current liabilities	$	—	$	—	$	40	$	40
Derivatives:
Derivative financial instruments (iv)	Other current liabilities and other non-current liabilities	$	—	$	5	$	—	$	5

(i)

(ii)

Consists of the Towers Watson Global Equity Focus Fund, for which redemptions can occur on any business day, and require a minimum of one business day’s notice.

(iii)

Consists of the Towers Watson Alternative Credit Fund, for which the redemption period is generally quarterly, however requires a 50-day notice.

(iv)

See Note 9 — Derivative Financial Instruments for further information on our derivative investments.

(v)

(vi)

Consideration due to be paid across multiple years until 2027.

Schedule of Change in Fair Value of Level 3 Liabilities

The following table summarizes the change in fair value of the Level 3 liabilities:


Fair Value Measurements Using Significant Unobservable Inputs (Level 3)	September 30, 2023
Balance at December 31, 2022	$	40
Obligations assumed		—
Payments		(2	)
Realized and unrealized losses (i)		3
Foreign exchange		(1	)
Balance at September 30, 2023	$	40

(i)

Schedule of Liabilities Whose Carrying Values Differ from the Fair Value and are Not Measured on a Recurring Basis

The following tables present our liabilities not measured at fair value on a recurring basis at September 30, 2023 and December 31, 2022:


	September 30, 2023				December 31, 2022
	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Long-term note receivable	$	70	$	62	$	68	$	63
Liabilities:
Current debt	$	649	$	640	$	250	$	248
Long-term debt	$	4,565	$	4,066	$	4,471	$	4,069

Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Leases - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Lessee, Lease, Description [Line Items]
Lease Cost	$ 52	$ 46	$ 147	$ 168
Restructuring Charges [Member]
Lessee, Lease, Description [Line Items]
Lease Cost	$ 15	$ 2	$ 23	$ 33

Other Income, Net (Tables)

9 Months Ended

Sep. 30, 2023

Other Income and Expenses [Abstract]

Schedule of Other Nonoperating Income

Other income, net consists of the following:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2023			2022			2023			2022
Gain/(loss) on disposal of operations (i)	$	41		$	21		$	44		$	(11	)
Net periodic pension and postretirement benefit credits		29			64			82			204
Interest in earnings of associates and other investments		1			—			3			4
Foreign exchange (loss)/gain (ii)		(3	)		(1	)		(7	)		4
Other		(2	)		1			4			4
Other income, net	$	66		$	85		$	126		$	205

(i)

For the nine months ended September 30, 2022, includes a $24 million non-cash revaluation gain related to an acquisition completed in stages.

(ii)

Includes the offsetting effects of the Company's foreign currency hedging program. See Note 9 — Derivative Financial Instruments.

Nature of Operations

9 Months Ended

Sep. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Nature of Operations

Note 1 — Nature of Operations

Willis Towers Watson Public Limited Company is a leading global advisory, broking and solutions company that provides data-driven, insight-led solutions in the areas of people, risk and capital. The Company has more than 46,000 colleagues serving more than 140 countries and markets.

We design and deliver solutions that manage risk, optimize benefits, cultivate talent and expand the power of capital to protect and strengthen institutions and individuals.

Our risk management services include strategic risk consulting (including providing actuarial analysis), a variety of due diligence services, the provision of practical on-site risk control services (such as health and safety and property loss control consulting), and analytical and advisory services (such as hazard modeling). We also assist our clients with planning for addressing incidents or crises when they occur. These services include contingency planning, security audits and product tampering plans.

We help our clients enhance business performance by delivering consulting services, technology and solutions that optimize benefits and cultivate talent. Our services and solutions encompass such areas as employee benefits, work and rewards, employee experience and benefits outsourcing. In addition, we provide investment advice to help our clients develop disciplined and efficient strategies to meet their investment goals and expand the power of capital.

As an insurance broker, we act as an intermediary between our clients and insurance carriers by advising on their risk management requirements, helping them to determine the best means of managing risk and negotiating and placing insurance with insurance carriers through our global distribution network.

We operate a private Medicare marketplace in the U.S. through which, along with our active employee marketplace, we help our clients move to a more sustainable economic model by capping and controlling the costs associated with healthcare benefits. We also provide direct-to-consumer sales of Medicare coverage.

We are not an insurance company, and therefore we do not underwrite insurable risks for our own account. We help sharpen strategies, enhance organizational resilience, motivate workforces and maximize performance to uncover opportunities for sustainable success.

Segment Information

9 Months Ended

Sep. 30, 2023

Segment Reporting [Abstract]

Segment Information

Note 5 — Segment Information

WTW has two reportable operating segments or business areas:

•

Health, Wealth & Career (‘HWC’); and

•

Risk & Broking (‘R&B’).

WTW’s chief operating decision maker is its chief executive officer. We determined that the operational data used by the chief operating decision maker is at the segment level. Management bases strategic goals and decisions on these segments and the data presented below is used to assess the adequacy of strategic decisions and the methods of achieving these strategies and related financial results. Management evaluates the performance of its segments and allocates resources to them based on net operating income on a pre-tax basis.

The Company experiences seasonal fluctuations of its revenue. Revenue is typically higher during the Company’s first and fourth quarters due primarily to the timing of broking-related activities.

The following table presents segment revenue and segment operating income for our reportable segments for the three months ended September 30, 2023 and 2022.


	Three Months Ended September 30,
	HWC				R&B				Total
	2023		2022		2023		2022		2023		2022
Segment revenue	$	1,282	$	1,162	$	855	$	765	$	2,137	$	1,927

Segment operating income	$	305	$	236	$	134	$	105	$	439	$	341

The following table presents segment revenue and segment operating income for our reportable segments for the nine months ended September 30, 2023 and 2022.


	Nine Months Ended September 30,
	HWC				R&B				Total
	2023		2022		2023		2022		2023		2022
Segment revenue	$	3,784	$	3,565	$	2,659	$	2,508	$	6,443	$	6,073

Segment operating income	$	836	$	710	$	459	$	465	$	1,295	$	1,175


	Three Months Ended September 30,						Nine Months Ended September 30,
	2023			2022			2023			2022
Revenue:
Total segment revenue	$	2,137		$	1,927		$	6,443		$	6,073
Reimbursable expenses and other		29			26			126			71
Revenue	$	2,166		$	1,953		$	6,569		$	6,144

Total segment operating income	$	439		$	341		$	1,295		$	1,175
Impairment (i)		—			—			—			(81	)
Amortization		(62	)		(71	)		(203	)		(239	)
Restructuring costs (ii)		(17	)		(9	)		(30	)		(71	)
Transaction and transformation (iii)		(113	)		(50	)		(265	)		(108	)
Unallocated, net (iv)		(88	)		(57	)		(211	)		(206	)
Income from operations		159			154			586			470
Interest expense		(61	)		(54	)		(172	)		(154	)
Other income, net		66			85			126			205
Income from continuing operations before income taxes	$	164		$	185		$	540		$	521

(i)

Represents the impairment related to the net assets of our Russian business that are held outside of our Russian entities (see Note 3 — Acquisitions and Divestitures for further information).

(ii)

See Note 6 — Restructuring Costs for the composition of costs for 2023 and 2022.

(iii)

(iv)

The Company does not currently provide asset information by reportable segment as it does not routinely evaluate the total asset position by segment.

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-15

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-31

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-40

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//280/tableOfContent

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 26
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-26

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 34
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-34

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-21

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-21

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2023

Components of Goodwill

The components of goodwill are outlined below for the nine months ended September 30, 2023.


	HWC			R&B			Total
Balance at December 31, 2022:
Goodwill, gross	$	7,870		$	2,795		$	10,665
Accumulated impairment losses		(130	)		(362	)		(492	)
Goodwill, net - December 31, 2022		7,740			2,433			10,173
Goodwill disposals		(21	)		—			(21	)
Foreign exchange		—			(9	)		(9	)
Balance at September 30, 2023:
Goodwill, gross		7,849			2,786			10,635
Accumulated impairment losses		(130	)		(362	)		(492	)
Goodwill, net - September 30, 2023	$	7,719		$	2,424		$	10,143

Changes in the Net Carrying Amount of the Components of Finite-Lived Intangible Assets

The following table reflects changes in the net carrying amounts of the components of finite-lived intangible assets for the nine months ended September 30, 2023:


	Client relationships			Software			Trademark and trade name			Other			Total
Balance at December 31, 2022:
Intangible assets, gross	$	3,760		$	725		$	1,038		$	98		$	5,621
Accumulated amortization		(2,282	)		(712	)		(298	)		(56	)		(3,348	)
Intangible assets, net - December 31, 2022		1,478			13			740			42			2,273
Intangible assets acquired		7			—			—			—			7
Intangible asset disposals		—			—			—			(13	)		(13	)
Amortization		(156	)		(9	)		(32	)		(6	)		(203	)
Balance at September 30, 2023:
Intangible assets, gross		3,766			720			1,037			63			5,586
Accumulated amortization		(2,437	)		(716	)		(329	)		(40	)		(3,522	)
Intangible assets, net - September 30, 2023	$	1,329		$	4		$	708		$	23		$	2,064

Schedule of Future Estimated Amortization Expense for Amortizable Intangible Assets

The table below reflects the future estimated amortization expense for amortizable intangible assets for the remainder of 2023 and for subsequent years:


	Amortization
Remainder of 2023	$	60
2024		229
2025		209
2026		200
2027		196
Thereafter		1,170
Total	$	2,064

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482548/350-20-55-24

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1A

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-2

Schedule of Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification from AOCI, Current Period, Tax	$ (2)	$ (2)	$ (8)	$ (6)

Revenue - Schedule of Remaining Performance Obligations (Details1)	Sep. 30, 2023 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 1,387

Basis of Presentation and Recent Accounting Pronouncements (Policies)	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited quarterly condensed consolidated financial statements of WTW and our subsidiaries are presented in accordance with the rules and regulations of the SEC for quarterly reports on Form 10-Q and therefore certain footnote disclosures have been condensed or omitted from these financial statements as they are not required for interim reporting under U.S. GAAP. In the opinion of management, these condensed consolidated financial statements reflect all adjustments, consisting of normal recurring adjustments, which are necessary for a fair presentation of the condensed consolidated financial statements and results for the interim periods. All intercompany accounts and transactions have been eliminated in consolidation. The condensed consolidated financial statements should be read together with the Company’s Annual Report on Form 10-K, filed with the SEC on February 24, 2023, and may be accessed via EDGAR on the SEC’s web site at www.sec.gov. The results of operations for the three and nine months ended September 30, 2023 are not necessarily indicative of the results that can be expected for the entire year. The Company experiences seasonal fluctuations of its revenue. Revenue is typically higher during the Company’s first and fourth quarters due primarily to the timing of broking-related activities. The results reflect certain estimates and assumptions made by management, including those estimates used in calculating acquisition consideration and fair value of tangible and intangible assets and acquisition-related liabilities, professional liability claims, estimated bonuses, valuation of billed and unbilled receivables, and anticipated tax liabilities that affect the amounts reported in the condensed consolidated financial statements and related notes.
Recent Accounting Pronouncements	Recent Accounting Pronouncements There were no new pronouncements that are expected to have a significant impact to the Company or its condensed consolidated financial statements.
Tax Legislation	Tax Legislation Inflation Reduction Act The Inflation Reduction Act (the ‘IRA’) was enacted into law on August 16, 2022 and certain portions of the IRA became effective January 1, 2023. The IRA introduced, among other provisions, a share repurchase excise tax and a new Corporate Alternative Minimum Tax (‘CAMT’) which imposes a 15% tax on the adjusted financial statement income of ‘applicable corporations’. The Company does not expect the excise tax or CAMT to have a significant impact on its condensed consolidated financial statements. Pillar Two On December 12, 2022, E.U. member states reached an agreement to implement Pillar Two, which introduces a global corporate minimum tax of 15% for certain large multinational companies beginning in 2023. For the rules to take effect, E.U. member states are required to enact domestic legislation by the end of 2023 to be effective January 1, 2024. The Company is currently evaluating the impact Pillar Two will have on its condensed consolidated financial statements.
Fair Value of Financial Instruments	The Company has categorized its assets and liabilities that are measured at fair value on a recurring and non-recurring basis into a three-level fair value hierarchy, based on the reliability of the inputs used to determine fair value as follows: • Level 1: refers to fair values determined based on quoted market prices in active markets for identical assets; • Level 2: refers to fair values estimated using observable market-based inputs or unobservable inputs that are corroborated by market data; and • Level 3: includes fair values estimated using unobservable inputs that are not corroborated by market data. The following methods and assumptions were used by the Company in estimating its fair value disclosure for financial instruments: • Mutual funds and exchange-traded funds are classified as Level 1 because we use quoted market prices in active markets in determining the fair value of these securities. • Commingled funds are not leveled within the fair value hierarchy as the funds are valued at the net value of shares held as reported by the manager of the funds. These funds are not exchange-traded. • Hedge funds are not leveled within the fair value hierarchy as the fair values for these investments are estimated based on the net asset values derived from the latest audited financial statements or most recent capital account statements provided by the funds’ investment manager or third-party administrator, as a practical expedient. • Market values for our derivative instruments have been used to determine the fair values of forward foreign exchange contracts based on estimated amounts the Company would receive or have to pay to terminate the agreements, taking into account observable information about the current foreign currency forward rates. Such financial instruments are classified as Level 2. • Contingent consideration payable is classified as Level 3, and we estimate fair value based on the likelihood and timing of achieving the relevant milestones of each arrangement, applying a probability assessment to each of the potential outcomes, which at times includes the use of a Monte Carlo simulation and discounting the probability-weighted payout. Typically, milestones are based on revenue or earnings growth for the acquired business.

Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Income from continuing operations	$ 139	$ 184	$ 441	$ 458
Less: income attributable to non-controllable interests	(3)	(2)	(8)	(10)
Income from continuing operations attributable to WTW	136	182	433	448
Income/(loss) from discontinued operations, net of tax	$ 0	$ 8	$ 0	$ (27)
Basic average number of shares outstanding (shares)	105	110	106	113
Dilutive effect of potentially issuable shares (shares)	0	1	1	1
Diluted average number of shares outstanding (shares)	105	111	107	114
Basic earnings per share from continuing operations attributable to WTW	$ 1.3	$ 1.65	$ 4.08	$ 3.95
Dilutive effect of potentially issuable shares	(0.01)	0	(0.02)	0
Diluted earnings per share from continuing operations attributable to WTW	1.29	1.65	4.06	3.95
Basic earnings/(loss) per share from discontinued operations, net of tax		0.07		(0.24)
Dilutive effect of potentially issuable shares	$ 0	0	$ 0	0
Diluted earnings/(loss) per share from discontinued operations, net of tax		$ 0.07		$ (0.24)

Restructuring Costs - Summary of Total Restructuring Costs (Details) - Transformation Program [Member] - USD ($) $ in Millions	9 Months Ended	12 Months Ended		24 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]
Total				$ 155
Real Estate Rationalization [Member]
Restructuring Cost and Reserve [Line Items]
Total	$ 29	$ 79	$ 19	127
Technology Modernization [Member]
Restructuring Cost and Reserve [Line Items]
Total	1	19	5	25
Process optimization [Member]
Restructuring Cost and Reserve [Line Items]
Total		1		1
Other [Member]
Restructuring Cost and Reserve [Line Items]
Total			2	2
Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Total				146
Corporate, Non-Segment \| Real Estate Rationalization [Member]
Restructuring Cost and Reserve [Line Items]
Total	29	79	19	127
Corporate, Non-Segment \| Technology Modernization [Member]
Restructuring Cost and Reserve [Line Items]
Total	$ 1	16		17
Corporate, Non-Segment \| Other [Member]
Restructuring Cost and Reserve [Line Items]
Total			2	2
HWC [Member]
Restructuring Cost and Reserve [Line Items]
Total				1
HWC [Member] \| Process optimization [Member]
Restructuring Cost and Reserve [Line Items]
Total		1		1
R&B [Member]
Restructuring Cost and Reserve [Line Items]
Total				8
R&B [Member] \| Technology Modernization [Member]
Restructuring Cost and Reserve [Line Items]
Total		$ 3	$ 5	$ 8

Earnings Per Share

9 Months Ended

Sep. 30, 2023

Earnings Per Share [Abstract]

Earnings Per Share

Note 18 — Earnings Per Share

Basic and diluted earnings per share from continuing operations attributable to WTW and discontinued operations, net of tax are calculated by dividing net income from continuing operations attributable to WTW and discontinued operations, net of tax, respectively, by the average number of ordinary shares outstanding during each period. The computation of diluted earnings per share reflects the potential dilution that could occur if dilutive securities and other contracts to issue shares were exercised or converted into shares or resulted in the issuance of shares that then shared in the net income of the Company.

At September 30, 2023 and 2022, there were 0.5 million and 0.4 million restricted time-based stock units outstanding, respectively, and there were 0.6 million restricted performance-based stock units outstanding at both periods presented. There were no time-based

share options at September 30, 2023; such options were immaterial at September 30, 2022. There were no performance-based options outstanding at both September 30, 2023 and 2022.

Basic and diluted earnings per share are as follows:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2023			2022			2023			2022
Income from continuing operations	$	139		$	184		$	441		$	458
Less: income attributable to non-controllable interests		(3	)		(2	)		(8	)		(10	)
Income from continuing operations attributable to WTW	$	136		$	182		$	433		$	448

Income/(loss) from discontinued operations, net of tax	$	—		$	8		$	—		$	(27	)

Basic average number of shares outstanding		105			110			106			113
Dilutive effect of potentially issuable shares		—			1			1			1
Diluted average number of shares outstanding		105			111			107			114

Basic earnings per share from continuing operations attributable to WTW	$	1.30		$	1.65		$	4.08		$	3.95
Dilutive effect of potentially issuable shares		(0.01	)		—			(0.02	)		—
Diluted earnings per share from continuing operations attributable to WTW	$	1.29		$	1.65		$	4.06		$	3.95

Basic earnings/(loss) per share from discontinued operations, net of tax	$	—		$	0.07		$	—		$	(0.24	)
Dilutive effect of potentially issuable shares		—			—			—			—
Diluted earnings/(loss) per share from discontinued operations, net of tax	$	—		$	0.07		$	—		$	(0.24	)

Anti-dilutive restricted stock units were immaterial for the three and nine months ended September 30, 2023; for both the three and nine months ended September 30, 2022, 0.3 million restricted stock units were not included in the computation of the dilutive effect of potentially issuable shares because their effect was anti-dilutive. There were no anti-dilutive options for the three and nine months ended September 30, 2023 and 2022.

Derivative Financial Instruments - Schedule of Derivative Instruments Designated As Hedging Instrument Effect on Condensed Consolidated Statements of Comprehensive Income (Details) - Cash Flow Hedging [Member] - Designated as Hedging Instrument [Member] - Foreign exchange contracts [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative [Line Items]
(Loss)/gain recognized in OCI (effective element)	$ (2)	$ (6)	$ 1	$ (12)
(Loss)/gain reclassified from Accumulated OCL into income (effective element)	$ 0	$ (2)	$ (1)	$ 0
Revenue [Member]
Derivative [Line Items]
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	Revenues	Revenues	Revenues	Revenues
(Loss)/gain reclassified from Accumulated OCL into income (effective element)	$ 0	$ 0	$ 0	$ 1
Salaries and Benefits [Member]
Derivative [Line Items]
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	Labor and Related Expense	Labor and Related Expense	Labor and Related Expense	Labor and Related Expense
(Loss)/gain reclassified from Accumulated OCL into income (effective element)	$ 0	$ (2)	$ (1)	$ (1)

Basis of Presentation and Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation and Recent Accounting Pronouncements	Note 2 — Basis of Presentation and Recent Accounting Pronouncements Basis of Presentation The accompanying unaudited quarterly condensed consolidated financial statements of WTW and our subsidiaries are presented in accordance with the rules and regulations of the SEC for quarterly reports on Form 10-Q and therefore certain footnote disclosures have been condensed or omitted from these financial statements as they are not required for interim reporting under U.S. GAAP. In the opinion of management, these condensed consolidated financial statements reflect all adjustments, consisting of normal recurring adjustments, which are necessary for a fair presentation of the condensed consolidated financial statements and results for the interim periods. All intercompany accounts and transactions have been eliminated in consolidation. The condensed consolidated financial statements should be read together with the Company’s Annual Report on Form 10-K, filed with the SEC on February 24, 2023, and may be accessed via EDGAR on the SEC’s web site at www.sec.gov. The results of operations for the three and nine months ended September 30, 2023 are not necessarily indicative of the results that can be expected for the entire year. The Company experiences seasonal fluctuations of its revenue. Revenue is typically higher during the Company’s first and fourth quarters due primarily to the timing of broking-related activities. The results reflect certain estimates and assumptions made by management, including those estimates used in calculating acquisition consideration and fair value of tangible and intangible assets and acquisition-related liabilities, professional liability claims, estimated bonuses, valuation of billed and unbilled receivables, and anticipated tax liabilities that affect the amounts reported in the condensed consolidated financial statements and related notes. Recent Accounting Pronouncements There were no new pronouncements that are expected to have a significant impact to the Company or its condensed consolidated financial statements. Tax Legislation Inflation Reduction Act The Inflation Reduction Act (the ‘IRA’) was enacted into law on August 16, 2022 and certain portions of the IRA became effective January 1, 2023. The IRA introduced, among other provisions, a share repurchase excise tax and a new Corporate Alternative Minimum Tax (‘CAMT’) which imposes a 15% tax on the adjusted financial statement income of ‘applicable corporations’. The Company does not expect the excise tax or CAMT to have a significant impact on its condensed consolidated financial statements. Pillar Two On December 12, 2022, E.U. member states reached an agreement to implement Pillar Two, which introduces a global corporate minimum tax of 15% for certain large multinational companies beginning in 2023. For the rules to take effect, E.U. member states are required to enact domestic legislation by the end of 2023 to be effective January 1, 2024. The Company is currently evaluating the impact Pillar Two will have on its condensed consolidated financial statements.

Accumulated Other Comprehensive Loss (Tables)

9 Months Ended

Sep. 30, 2023

Equity [Abstract]


	Foreign currency translation (i)						Derivative instruments (i)						Defined pension and post-retirement benefit costs (ii)						Total
	2023			2022			2023			2022			2023			2022			2023			2022
Quarter-to-date activity:
Balance at June 30, 2023 and 2022, respectively	$	(926	)	$	(794	)	$	12		$	6		$	(1,626	)	$	(1,698	)	$	(2,540	)	$	(2,486	)
Other comprehensive (loss)/income before reclassifications		(85	)		(240	)		(2	)		(5	)		(1	)		5			(88	)		(240	)
Loss reclassified from accumulated other comprehensive loss (net of income tax benefit of $2 and $2 at both periods)		—			—			—			1			8			5			8			6
Net current-period other comprehensive (loss)/income		(85	)		(240	)		(2	)		(4	)		7			10			(80	)		(234	)
Balance at September 30, 2023 and 2022, respectively	$	(1,011	)	$	(1,034	)	$	10		$	2		$	(1,619	)	$	(1,688	)	$	(2,620	)	$	(2,720	)

Year-to-date activity:
Balance at December 31, 2022 and 2021, respectively	$	(987	)	$	(489	)	$	9		$	11		$	(1,643	)	$	(1,708	)	$	(2,621	)	$	(2,186	)
Other comprehensive (loss)/income before reclassifications		(24	)		(545	)		1			(8	)		(1	)		3			(24	)		(550	)
(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax benefit of $8 and $6, respectively)		—			—			—			(1	)		25			17			25			16
Net current-period other comprehensive (loss)/income		(24	)		(545	)		1			(9	)		24			20			1			(534	)
Balance at September 30, 2023 and 2022, respectively	$	(1,011	)	$	(1,034	)	$	10		$	2		$	(1,619	)	$	(1,688	)	$	(2,620	)	$	(2,720	)

(i)

(ii)

Revenue - Schedule of Contract Balances (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Billed Receivable, Current	$ 1,296	$ 1,464
Unbilled Receivable, Current	514	457
Contract asset, Current	269	466
Accounts receivable, net	2,079	2,387
Non-current accounts receivable, net	8	9
Non-current contract assets	803	745
Deferred revenue	$ 666	$ 646

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
ASSETS
Cash and cash equivalents	$ 1,247	$ 1,262
Fiduciary assets	8,039	11,772
Accounts receivable, net	2,079	2,387
Prepaid and other current assets	469	414
Total current assets	11,834	15,835
Fixed assets, net	710	718
Goodwill	10,143	10,173
Other intangible assets, net	2,064	2,273
Right-of-use assets	533	586
Pension benefits assets	908	827
Other non-current assets	1,431	1,357
Total non-current assets	15,789	15,934
TOTAL ASSETS	27,623	31,769
LIABILITIES AND EQUITY
Fiduciary liabilities	8,039	11,772
Deferred revenue and accrued expenses	1,868	1,915
Current debt	649	250
Current lease liabilities	119	126
Other current liabilities	630	716
Total current liabilities	11,305	14,779
Long-term debt	4,565	4,471
Liability for pension benefits	433	480
Deferred tax liabilities	706	748
Provision for liabilities	360	357
Long-term lease liabilities	569	620
Other non-current liabilities	200	221
Total non-current liabilities	6,833	6,897
TOTAL LIABILITIES	18,138	21,676
COMMITMENTS AND CONTINGENCIES
EQUITY
Additional paid-in capital	10,903	10,876
Retained earnings	1,127	1,764
Accumulated other comprehensive loss, net of tax	(2,620)	(2,621)
Treasury shares, at cost, 17,519 shares in 2022	0	(3)
Total WTW shareholders' equity	9,410	10,016
Non-controlling interests	75	77
Total equity	9,485	10,093
TOTAL LIABILITIES AND EQUITY	$ 27,623	$ 31,769

Nature of Operations (Details)	Sep. 30, 2023 Employee Country
Minority Interest [Line Items]
Number of employees employed (more than 46,000) \| Employee	46,000
Number of countries in which entity operates (more than 140) \| Country	140

Revenue - Schedule of Remaining Performance Obligations (Details)	Sep. 30, 2023 USD ($)
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 1,387
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-10-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 213,000,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 470,000,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 704,000,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year

Retirement Benefits

9 Months Ended

Sep. 30, 2023

Retirement Benefits [Abstract]

Retirement Benefits

Note 12 — Retirement Benefits

Defined Benefit Plans

WTW sponsors both qualified and non-qualified defined benefit pension plans throughout the world. The majority of our plan assets and obligations are in the U.S. and the U.K. We have also included disclosures related to defined benefit plans in certain other countries, including Canada, France, Germany, Switzerland and Ireland. Together, these disclosed funded and unfunded plans represent 98% of WTW’s pension obligations and are disclosed herein. We have removed prior-period disclosures pertaining to our post-retirement welfare plans as the Company considers such disclosure to no longer be material.

Components of Net Periodic Benefit (Income)/Cost for Defined Benefit Pension Plans

The following tables set forth the components of net periodic benefit (income)/cost for the Company’s defined benefit pension plans for the three and nine months ended September 30, 2023 and 2022:


	Three Months Ended September 30,
	2023									2022
	U.S.			U.K.			Other			U.S.			U.K.			Other
Service cost	$	14		$	1		$	4		$	20		$	2		$	6
Interest cost		48			31			7			29			18			4
Expected return on plan assets		(76	)		(41	)		(10	)		(83	)		(34	)		(10	)
Settlements		—			—			—			3			1			—
Amortization of net loss		3			12			—			4			7			—
Amortization of prior service credit		—			(3	)		—			—			(3	)		1
Net periodic benefit (income)/cost	$	(11	)	$	—		$	1		$	(27	)	$	(9	)	$	1


	Nine Months Ended September 30,
	2023									2022
	U.S.			U.K.			Other			U.S.			U.K.			Other
Service cost	$	42		$	4		$	11		$	58		$	9		$	17
Interest cost		146			90			21			88			54			12
Expected return on plan assets		(228	)		(121	)		(29	)		(248	)		(110	)		(29	)
Settlements		1			—			(1	)		3			1			—
Amortization of net loss		9			36			—			11			22			2
Amortization of prior service credit		—			(9	)		1			—			(9	)		1
Net periodic benefit (income)/cost	$	(30	)	$	—		$	3		$	(88	)	$	(33	)	$	3

Employer Contributions to Defined Benefit Pension Plans

The Company did not make any contributions to its U.S. plans during the nine months ended September 30, 2023 and currently does not anticipate making contributions over the remainder of the fiscal year. The Company made contributions of $10 million to its U.K. plans for the nine months ended September 30, 2023 and currently does not anticipate making contributions over the remainder of the fiscal year. The Company made contributions of $21 million to its other plans for the nine months ended September 30, 2023 and anticipates making additional contributions of $2 million for the remainder of the fiscal year.

Defined Contribution Plans

The Company made contributions to its defined contribution plans of $40 million and $121 million during the three and nine months ended September 30, 2023, respectively, and $34 million and $114 million during the three and nine months ended September 30, 2022, respectively.

The entire disclosure for retirement benefits.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480794/715-70-50-1

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(03)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (q)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (l)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//715/tableOfContent

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (o)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (p)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (r)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (r)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480126/715-20-S99-2

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480266/715-60-50-3

Supplemental disclosures of cash flow information:

Supplemental Disclosures of Cash Flow Information (Details) - USD ($)
$ in Millions

9 Months Ended

Sep. 30, 2023

Sep. 30, 2022

Dec. 31, 2022

Cash and cash equivalents

$ 1,247

$ 1,496

$ 1,262

Fiduciary funds (included in fiduciary assets)

2,485

3,170

Cash and cash equivalents and fiduciary funds (included in current assets held for sale)

Total cash, cash equivalents and restricted cash

3,732

4,671

Increase/(decrease) in cash, cash equivalents and other restricted cash

^[1],[2]

(935)

(2,730)

Non-Fiduciary [Member]

Supplemental disclosures of cash flow information:

Increase/(decrease) in cash, cash equivalents and other restricted cash

(2,904)

Fiduciary [Member]

Supplemental disclosures of cash flow information:

Increase/(decrease) in cash, cash equivalents and other restricted cash

$ (940)

$ 174

[1]	Does not include the effect of exchange rate changes on cash, cash equivalents and restricted cash.
[2]	The amounts of cash, cash equivalents and restricted cash, their respective classification on the condensed consolidated balance sheets as well as their respective portions of the increase or decrease in cash, cash equivalents and restricted cash for each of the periods presented have been included in Note 19 — Supplemental Disclosures of Cash Flow Information.

Restructuring Costs - Rollforward of Liability Associated with Cash-based Charges (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Charges incurred	$ 17	$ 9		$ 30	$ 71
Transformation Program [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			$ 0	6	1	$ 1
Charges incurred			2	11		28
Cash payments			(1)	(14)		(23)
Ending Balance	3		1	3		6
Transformation Program [Member] \| Real Estate Rationalization [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance				6
Charges incurred				11		27
Cash payments				(14)		(21)
Ending Balance	3			3		6
Transformation Program [Member] \| Process optimization [Member]
Restructuring Cost and Reserve [Line Items]
Charges incurred						1
Cash payments						(1)
Transformation Program [Member] \| Other [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			0		$ 1	1
Charges incurred			2
Cash payments			(1)			$ (1)
Ending Balance	$ 0		$ 1	$ 0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.