0001564590-21-040668 | 10-Q | XBRL Viewer

313

305

Dividends attributable to non-controlling interests

(88)

(1)

Issuance of shares under employee stock compensation plans

(220)

(219)

(1)

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

Equity, ending balance at Mar. 31, 2020

10,389

10,703

2,009

(3)

(2,446)

10,263

126

Equity, ending balance (in shares) at Mar. 31, 2020

128,726

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

102

Dividends attributable to non-controlling interests

(88)

(12)

Issuance of shares under employee stock compensation plans

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

Reduction of non-controlling interests

Other

(3)

(1)

Equity, ending balance at Jun. 30, 2020

(1)

10,456

10,713

2,015

(3)

(2,390)

10,335

121

Equity, ending balance (in shares) at Jun. 30, 2020

128,763

Equity, beginning balance at Dec. 31, 2020

10,932

10,748

2,434

(3)

(2,359)

10,820

112

Equity, beginning balance (in shares) at Dec. 31, 2020

128,965

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

736

733

Dividends attributable to non-controlling interests

(92)

(17)

Issuance of shares under employee stock compensation plans

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

Reduction of non-controlling interests

^[2]

(52)

Equity, ending balance at Mar. 31, 2021

11,574

10,765

3,075

(3)

(2,311)

11,526

Equity, ending balance (in shares) at Mar. 31, 2021

128,974

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

186

184

Dividends attributable to non-controlling interests

(93)

(4)

Issuance of shares under employee stock compensation plans

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

Reduction of non-controlling interests

^[2]

(1)

Equity, ending balance at Jun. 30, 2021

(1)

$ 11,715

$ 10,785

$ 3,166

$ (3)

$ (2,278)

$ 11,670

$ 45

Equity, ending balance (in shares) at Jun. 30, 2021

128,988

[1]	Accumulated other comprehensive loss, net of tax (‘AOCL’).
[2]	Attributable to the divestiture of our less than wholly-owned Miller subsidiary.

Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020
Statement Of Stockholders Equity [Abstract]
Dividends declared per share	$ 0.71	$ 0.71	$ 0.68	$ 0.68

Nature of Operations

6 Months Ended

Jun. 30, 2021

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Nature of Operations

Note 1 — Nature of Operations

Willis Towers Watson plc is a leading global advisory, broking and solutions company that helps clients around the world turn risk into a path for growth. The Company has more than 46,000 employees and services clients in more than 140 countries.

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 and reinsurance optimization studies). 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, total rewards, talent 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 believe our broad perspective allows us to see the critical intersections between talent, assets and ideas - the dynamic formula that drives business performance.

Termination of Proposed Combination with Aon plc

On March 9, 2020, WTW and Aon plc (‘Aon’) issued an announcement disclosing that the respective boards of directors of WTW and Aon had reached agreement on the terms of a recommended acquisition of WTW by Aon. Under the terms of the agreement each WTW shareholder would receive 1.08 Aon ordinary shares for each WTW ordinary share. At the time of the announcement, it was estimated that upon completion of the combination, existing Aon shareholders would own approximately 63% and existing WTW shareholders would own approximately 37% of the combined company on a fully diluted basis.

The transaction was approved by the shareholders of both WTW and Aon during meetings of the respective shareholders held on August 26, 2020. On June 16, 2021, the U.S. Department of Justice filed suit in U.S. District Court in the District of Columbia against WTW and Aon, seeking to enjoin the proposed business combination between the two companies (among other relief). On July 26, 2021, WTW and Aon announced they had terminated the business combination agreement and that Aon had agreed to pay WTW, in connection with such termination, a $1 billion termination fee (the ‘Termination’). Pursuant to the terms of the termination agreement, among other things, the business combination agreement between WTW and Aon was terminated by mutual consent, subject to payment in cash by Aon of the $1 billion, which was received by WTW on July 27, 2021 (the ‘Termination Agreement’). Under the Termination Agreement, WTW and Aon on behalf of themselves and certain other related and affiliated parties, each agreed to release the other from all claims and actions arising out of or related to the business combination agreement and the transactions contemplated thereby, subject to certain exceptions. See Note 13 – Commitments and Contingencies for a summary of the pending lawsuits in the U.S. arising in connection with the business combination.

Basis of Presentation and Recent Accounting Pronouncements

6 Months Ended

Jun. 30, 2021

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 Willis Towers Watson and our subsidiaries are presented in accordance with the rules and regulations of the SEC for quarterly reports on Form 10-Q and therefore do not include all of the information and footnotes required by 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 23, 2021, and may be accessed via EDGAR on the SEC’s web site at www.sec.gov.

The results of operations for the three and six months ended June 30, 2021 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 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.

Risks and Uncertainties Related to the COVID-19 Pandemic

The COVID-19 pandemic has had an adverse impact on global commercial activity, including the global supply chain, and has contributed to significant volatility in the global financial markets including, among other effects, occasional declines in the equity markets, changes in interest rates and reduced liquidity on a global basis. With regard to the effects on our own business operations and those of our clients, suppliers and other third parties with whom we interact, the Company has regularly considered the impact of COVID-19 on our business, taking into account our business resilience and continuity plans, financial modeling and stress testing of liquidity and financial resources.

Generally, the COVID-19 pandemic did not have a material adverse impact on our overall financial results during 2020 or on our results for the first half of 2021; however, during 2020 and through the first quarter of 2021, the COVID-19 pandemic had a negative impact on our revenue growth, primarily in our businesses that are discretionary in nature. We saw an increased demand for these services, which improved revenue growth, in the second quarter of 2021. We believe this positive trend could continue for the remainder of the year but may vary based on further disruptions to the supply chain, workforce availability, vaccination rates and further social-distancing orders in jurisdictions where we do business.

We have considered this outlook as part of the significant estimates and assumptions that are inherent in our financial statements, including the collectability of billed and unbilled receivables, the estimation of revenue, and the fair value of our reporting units, tangible and intangible assets and contingent consideration. With regard to collectability of receivables, we believe we may continue to face atypical delays in client payments going forward. Although the primary revenue impact of the pandemic has been on certain discretionary lines of business, non-discretionary lines of business have also been, to some extent, adversely affected and may be adversely affected in the future. Further, reduced economic activity or disruption in insurance markets could reduce the demand for or the extent of insurance coverage. For example, in 2020, we saw instances where the reduced demand for air travel reduced the extent of insurance coverage needed. Also, the increased frequency and severity of coverage disputes between our clients and (re)insurers arising out of the pandemic could increase our professional liability risk. We will continue to monitor the situation and assess any implications to our business and our stakeholders.

The extent to which COVID-19 impacts our business and financial position will depend on future developments, which are difficult to predict. These future developments may include the severity and scope of the COVID-19 outbreak, which may unexpectedly change or worsen, and the types and duration of measures imposed by governmental authorities to contain the virus or address its impact. We continue to expect that the COVID-19 pandemic will negatively impact our revenue and operating results in fiscal 2021. We believe that these trends and uncertainties are similar to those faced by other comparable registrants as a result of the pandemic.

Recent Accounting Pronouncements

Not Yet Adopted

There are no pending accounting pronouncements that are expected to have a significant impact on our condensed consolidated financial statements.

Adopted

In December 2019, the FASB issued ASU No. 2019-12, Simplifying the Accounting for Income Taxes, which clarifies and amends existing guidance, including removing certain exceptions to the general principles of accounting for income taxes. Some of the changes must be applied on a retrospective or modified retrospective basis while others must be applied on a prospective basis. The Company adopted this guidance as it became effective on January 1, 2021 without any impact to our condensed consolidated financial statements.

Divestitures

6 Months Ended

Jun. 30, 2021

Dispositions [Abstract]

Divestitures

Note 3 — Divestitures

Termination of Potential Divestiture Related to the Aon Combination

As part of the potential combination with Aon and the required regulatory clearances in connection therewith, on May 12, 2021, the Company entered into a definitive agreement to sell its wholly-owned subsidiary Willis Re and certain of the Company’s corporate

risk and broking and health and benefit businesses to Arthur J. Gallagher & Co. (‘Gallagher’), a leading global provider of insurance, risk management and consulting services, for total consideration of $3.57 billion. In connection with the Termination, the definitive agreement with Gallagher automatically terminated in accordance with its terms.

Miller Divestiture

On March 1, 2021, the Company completed the transaction to sell its U.K.-based, majority-owned wholesale subsidiary Miller for final total consideration of GBP 623 million ($818 million), which includes amounts paid to the minority shareholder. The $356 million net tax-exempt gain on the sale was included in Other income, net in the condensed consolidated statement of comprehensive income for the six months ended June 30, 2021. Prior to disposal, Miller was included within the Investment, Risk and Reinsurance segment.

Max Matthiessen Divestiture

In September 2020, the Company completed the transaction to sell its Swedish majority-owned subsidiary MM Holding AB (‘Max Matthiessen’) for total consideration of SEK 2.3 billion ($262 million) plus certain other adjustments, resulting in a tax-exempt gain on the sale of $86 million, which was included in Other income, net in the consolidated statement of comprehensive income during the year ended December 31, 2020. Of the total consideration, the Company financed a SEK 600 million ($68 million) note repayable by the purchaser. The note has no fixed term but is repayable subject to certain terms and conditions and bears an interest rate that could range from 5% to 10%, increasing the longer the note remains outstanding. This note receivable is included in Other non-current assets in the condensed consolidated balance sheet. Prior to disposal, Max Matthiessen was included within the Investment, Risk and Reinsurance segment.

Revenue

6 Months Ended

Jun. 30, 2021

Revenue From Contract With Customer [Abstract]

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 six months ended June 30, 2021 and 2020. Along with reimbursable expenses and other, total revenue by service offering represents our revenue from customer contracts.

	Three Months Ended June 30,
	HCB				CRB				IRR				BDA				Corporate ⁽ⁱ⁾					Total
	2021		2020		2021		2020		2021		2020		2021		2020		2021			2020		2021		2020
Broking	$	83	$	71	$	687	$	637	$	203	$	258	$	121	$	90	$	—		$	—	$	1,094	$	1,056
Consulting		576		531		46		40		115		95		—		—		2			2		739		668
Outsourced administration		124		122		15		16		4		3		121		119		—			—		264		260
Other		50		41		5		1		76		55		—		—		1			1		132		98
Total revenue by service offering		833		765		753		694		398		411		242		209		3			3		2,229		2,082
Reimbursable expenses and other ⁽ⁱ⁾		12		11		1		1		2		1		2		2		(1	)		4		16		19
Total revenue from customer contracts	$	845	$	776	$	754	$	695	$	400	$	412	$	244	$	211	$	2		$	7	$	2,245	$	2,101
Interest and other income ⁽ⁱⁱ⁾		3		2		35		7		2		2		—		—		1			1		41		12
Total revenue	$	848	$	778	$	789	$	702	$	402	$	414	$	244	$	211	$	3		$	8	$	2,286	$	2,113

	Six Months Ended June 30,
	HCB				CRB				IRR				BDA				Corporate ⁽ⁱ⁾					Total
	2021		2020		2021		2020		2021		2020		2021		2020		2021			2020		2021		2020
Broking	$	180	$	154	$	1,404	$	1,285	$	615	$	691	$	273	$	188	$	—		$	—	$	2,472	$	2,318
Consulting		1,170		1,113		90		87		238		188		—		—		4			4		1,502		1,392
Outsourced administration		256		250		40		41		8		6		253		252		—			—		557		549
Other		99		88		9		2		141		138		—		—		2			2		251		230
Total revenue by service offering		1,705		1,605		1,543		1,415		1,002		1,023		526		440		6			6		4,782		4,489
Reimbursable expenses and other ⁽ⁱ⁾		23		26		1		1		3		4		4		5		(6	)		10		25		46
Total revenue from customer contracts	$	1,728	$	1,631	$	1,544	$	1,416	$	1,005	$	1,027	$	530	$	445	$	—		$	16	$	4,807	$	4,535
Interest and other income ⁽ⁱⁱ⁾		6		12		55		25		3		5		3		—		2			2		69		44
Total revenue	$	1,734	$	1,643	$	1,599	$	1,441	$	1,008	$	1,032	$	533	$	445	$	2		$	18	$	4,876	$	4,579

______________

(i)

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.

(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 increase in CRB’s interest and other income resulted from book-of-business sales.

The following tables present revenue by the geography where our work is performed for the three and six months ended June 30, 2021 and 2020. 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 June 30,
	HCB				CRB				IRR				BDA				Corporate				Total
	2021		2020		2021		2020		2021		2020		2021		2020		2021		2020		2021		2020
North America	$	477	$	462	$	308	$	296	$	125	$	117	$	239	$	207	$	3	$	2	$	1,152	$	1,084
Great Britain		143		117		173		160		205		207		—		—		—		—		521		484
Western Europe		138		119		144		127		25		49		—		—		—		1		307		296
International		75		67		128		111		43		38		3		2		—		—		249		218
Total revenue by geography	$	833	$	765	$	753	$	694	$	398	$	411	$	242	$	209	$	3	$	3	$	2,229	$	2,082

	Six Months Ended June 30,
	HCB				CRB				IRR				BDA				Corporate				Total
	2021		2020		2021		2020		2021		2020		2021		2020		2021		2020		2021		2020
North America	$	945	$	938	$	555	$	529	$	311	$	287	$	521	$	436	$	5	$	4	$	2,337	$	2,194
Great Britain		290		243		328		297		516		528		—		—		—		—		1,134		1,068
Western Europe		309		275		405		371		84		125		—		—		1		2		799		773
International		161		149		255		218		91		83		5		4		—		—		512		454
Total revenue by geography	$	1,705	$	1,605	$	1,543	$	1,415	$	1,002	$	1,023	$	526	$	440	$	6	$	6	$	4,782	$	4,489

Contract Balances

The Company reports accounts receivable, net on the condensed consolidated balance sheet, 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 June 30, 2021 and December 31, 2020:

	June 30, 2021		December 31, 2020
Billed receivables, net of allowance for doubtful accounts of $44 million and $41 million	$	1,728	$	1,697
Unbilled receivables		501		445
Current contract assets		278		413
Accounts receivable, net	$	2,507	$	2,555
Non-current accounts receivable, net	$	19	$	34
Non-current contract assets	$	405	$	329
Deferred revenue	$	638	$	549

During the three and six months ended June 30, 2021, revenue of $94 million and $369 million, respectively, was recognized that was reflected as deferred revenue at December 31, 2020. During the three months ended June 30, 2021, revenue of $261 million was recognized that was reflected as deferred revenue at March 31, 2021.

During the three and six months ended June 30, 2021, the Company recognized revenue of $17 million and $46 million, respectively, related to performance obligations satisfied prior to 2021.

Performance Obligations

The Company has contracts for which performance obligations have not been satisfied as of June 30, 2021 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.

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 2021				2022				2023 onward				Total
Revenue expected to be recognized on contracts as of June 30, 2021		$	323			$	493			$	649			$	1,465

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 June 30, 2021 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.

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Segment Information

6 Months Ended

Jun. 30, 2021

Segment Reporting [Abstract]

Segment Information

Note 5 — Segment Information

Willis Towers Watson has four reportable operating segments or business areas:

•

Human Capital and Benefits (‘HCB’)

•

Corporate Risk and Broking (‘CRB’)

•

Investment, Risk and Reinsurance (‘IRR’)

•

Benefits Delivery and Administration (‘BDA’)

Willis Towers Watson’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 June 30, 2021 and 2020.

	Three Months Ended June 30,
	HCB				CRB				IRR				BDA						Total
	2021		2020		2021		2020		2021		2020		2021			2020			2021		2020
Segment revenue	$	836	$	767	$	788	$	701	$	400	$	413	$	242		$	209		$	2,266	$	2,090

Segment operating income/(loss)	$	192	$	160	$	181	$	135	$	133	$	119	$	(10	)	$	(9	)	$	496	$	405

The following table presents segment revenue and segment operating income for our reportable segments for the six months ended June 30, 2021 and 2020.

	Six Months Ended June 30,
	HCB				CRB				IRR				BDA						Total
	2021		2020		2021		2020		2021		2020		2021			2020			2021		2020
Segment revenue	$	1,711	$	1,617	$	1,598	$	1,440	$	1,005	$	1,028	$	529		$	440		$	4,843	$	4,525

Segment operating income/(loss)	$	412	$	373	$	343	$	262	$	423	$	396	$	(3	)	$	(20	)	$	1,175	$	1,011

The following table presents reconciliations of the information reported by segment to the Company’s condensed consolidated statements of comprehensive income for the three and six months ended June 30, 2021 and 2020.

	Three Months Ended June 30,						Six Months Ended June 30,
	2021			2020			2021			2020
Revenue:
Total segment revenue	$	2,266		$	2,090		$	4,843		$	4,525
Reimbursable expenses and other		20			23			33			54
Revenue	$	2,286		$	2,113		$	4,876		$	4,579

Total segment operating income	$	496		$	405		$	1,175		$	1,011
Amortization		(98	)		(119	)		(201	)		(240	)
Transaction and integration expenses ⁽ⁱ⁾		(51	)		(14	)		(75	)		(23	)
Unallocated, net ⁽ⁱⁱ⁾		(87	)		(109	)		(187	)		(225	)
Income from operations		260			163			712			523
Interest expense		(52	)		(62	)		(111	)		(123	)
Other income, net		74			76			513			168
Income from operations before income taxes	$	282		$	177		$	1,114		$	568

(i)	Includes mainly transaction costs related to the proposed Aon combination prior to its termination.

(ii)	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.

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.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Income Taxes

6 Months Ended

Jun. 30, 2021

Income Tax Disclosure [Abstract]

Income Taxes

Note 6 — Income Taxes

Provision for income taxes for the three and six months ended June 30, 2021 was $96 million and $192 million, respectively, compared to $75 million and $153 million for the three and six months ended June 30, 2020, respectively. The effective tax rates were 33.8% and 17.2% for the three and six months ended June 30, 2021, respectively, and 42.2% and 26.9% for the three and six months ended June 30, 2020, 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 current quarter effective tax rate includes a $40 million deferred tax expense related to the enacted U.K. statutory tax rate change, however the prior year effective tax rate for the three months ended June 30, 2020 was higher due to additional expense recognized in connection with the temporary provisions of the Coronavirus Aid, Relief, and Economic Security (‘CARES’) Act. The current first half effective tax rate was lower primarily due to the tax-exempt disposal of our Miller business, partially offset by the income tax effects of the U.K. tax rate change enacted in the second quarter of 2021.

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, we have not provided taxes on cumulative earnings of our subsidiaries that have been reinvested indefinitely. As a result of our plans to restructure or distribute accumulated earnings of certain foreign operations, we have recorded an estimate of foreign withholding and state income taxes. However, we assert that the historical cumulative earnings of our other subsidiaries are reinvested indefinitely, and therefore do 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 of $47 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 $3 million to $8 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.

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

6 Months Ended

Jun. 30, 2021

Goodwill and Other Intangible Assets

Note 7 — Goodwill and Other Intangible Assets

The components of goodwill are outlined below for the six months ended June 30, 2021:

	HCB			CRB			IRR			BDA		Total
Balance at December 31, 2020:
Goodwill, gross	$	4,346		$	2,378		$	1,694		$	3,278	$	11,696
Accumulated impairment losses		(130	)		(362	)		—			—		(492	)
Goodwill, net - December 31, 2020		4,216			2,016			1,694			3,278		11,204
Goodwill disposals		—			—			(188	)		—		(188	)
Foreign exchange		(12	)		(12	)		3			—		(21	)
Balance at June 30, 2021:
Goodwill, gross		4,334			2,366			1,509			3,278		11,487
Accumulated impairment losses		(130	)		(362	)		—			—		(492	)
Goodwill, net - June 30, 2021	$	4,204		$	2,004		$	1,509		$	3,278	$	10,995

Other Intangible Assets

The following table reflects changes in the net carrying amounts of the components of finite-lived intangible assets for the six months ended June 30, 2021:

	Client relationships			Software			Trademark and trade name			Other			Total
Balance at December 31, 2020:
Intangible assets, gross	$	4,065		$	761		$	1,054		$	108		$	5,988
Accumulated amortization		(2,031	)		(659	)		(220	)		(35	)		(2,945	)
Intangible assets, net - December 31, 2020		2,034			102			834			73			3,043
Intangible asset disposals		(46	)		—			(8	)		—			(54	)
Amortization		(134	)		(37	)		(22	)		(8	)		(201	)
Foreign exchange		(5	)		—			1			2			(2	)
Balance at June 30, 2021:
Intangible assets, gross		3,872			747			1,041			110			5,770
Accumulated amortization		(2,023	)		(682	)		(236	)		(43	)		(2,984	)
Intangible assets, net - June 30, 2021	$	1,849		$	65		$	805		$	67		$	2,786

The weighted-average remaining life of amortizable intangible assets at June 30, 2021 was 13.2 years.

The table below reflects the future estimated amortization expense for amortizable intangible assets for the remainder of 2021 and for subsequent years:

	Amortization
Remainder of 2021	$	171
2022		310
2023		257
2024		226
2025		205
Thereafter		1,617
Total	$	2,786

Derivative Financial Instruments

6 Months Ended

Jun. 30, 2021

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Note 8 — 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 10 — Fair Value Measurements and Note 16 — 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 sheet. To reduce such variability, we use foreign exchange contracts to hedge against this currency risk.

These derivatives were designated as hedging instruments and at June 30, 2021 and December 31, 2020 had total notional amounts of $186 million and $340 million, respectively, and had a net fair value asset of $5 million at both periods presented. As part of and prior to our disposal of Miller (see Note 3 – Divestitures), and prior to their contract expiration, we closed derivatives designated as hedging instruments with notional values of $27 million that were outstanding at December 31, 2020.

At June 30, 2021, the Company estimates, based on current exchange rates, there will be $4 million of net derivative gains on forward exchange rates reclassified from accumulated other comprehensive loss into earnings within the next twelve months as the forecast transactions affect earnings. At June 30, 2021, our longest outstanding maturity was 1.5 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 six months ended June 30, 2021 and 2020 are below. Amounts pertaining to the ineffective portion of hedging instruments and those excluded from effectiveness testing were immaterial for the three and six months ended June 30, 2021 and 2020.

	Gain/(loss) recognized in OCI (effective element)
	Three months ended June 30,					Six months ended June 30,
	2021		2020			2021		2020
Forward exchange contracts	$	1	$	(3	)	$	5	$	(27	)

Location of gain/(loss) reclassified from Accumulated OCL into income (effective element)	Gain/(loss) reclassified from Accumulated OCL into income (effective element)
	Three months ended June 30,					Six months ended June 30,
	2021		2020			2021			2020
Revenue	$	—	$	(1	)	$	(2	)	$	(1	)
Salaries and benefits		3		(1	)		6			(3	)
	$	3	$	(2	)	$	4		$	(4	)

We also enter into foreign currency transactions, primarily to hedge certain intercompany loans and other balance sheet exposures in currencies other than the functional currency of a given entity. These derivatives are not generally designated as hedging instruments, and at June 30, 2021 and December 31, 2020, we had notional amounts of $1.6 billion and $1.5 billion, respectively, and had a net fair value liability of $14 million and a net fair value asset of $15 million, respectively.

The effects of derivatives that have not been designated as hedging instruments on the condensed consolidated statements of comprehensive income for the three and six months ended June 30, 2021 and 2020 are as follows:

		Loss recognized in income
		Three Months Ended June 30,						Six Months Ended June 30,
Derivatives not designated as hedging instruments:	Location of loss recognized in income	2021			2020			2021			2020
Forward exchange contracts	Other income, net	$	(13	)	$	(8	)	$	(29	)	$	(20	)

Debt

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Debt

Note 9 — Debt

Current debt consists of the following:

	June 30, 2021		December 31, 2020
Revolving $1.25 billion credit facility ⁽ⁱ⁾	$	—	$	—
5.750% senior notes due 2021		—		500
3.500% senior notes due 2021		450		449
2.125% senior notes due 2022⁽ⁱⁱ⁾		640		—
Current portion of collateralized facility		20		22
	$	1,110	$	971

Long-term debt consists of the following:

	June 30, 2021		December 31, 2020
Revolving $1.25 billion credit facility	$	—	$	—
Collateralized facility ⁽ⁱⁱⁱ⁾		22		33
2.125% senior notes due 2022⁽ⁱⁱ⁾		—		659
4.625% senior notes due 2023		249		249
3.600% senior notes due 2024		647		647
4.400% senior notes due 2026		546		546
4.500% senior notes due 2028		596		596
2.950% senior notes due 2029		727		726
6.125% senior notes due 2043		271		271
5.050% senior notes due 2048		395		395
3.875% senior notes due 2049		542		542
	$	3,995	$	4,664

(i)	The $1.25 billion revolving credit facility expires on March 7, 2022.

(ii)	Notes issued in Euro (€540 million).

(iii)

At June 30, 2021 and December 31, 2020, the Company had $87 million and $98 million, respectively, of renewal commissions receivables pledged as collateral for this facility.

Payment of 5.750% Senior Notes due 2021

In March 2021, the $500 million 5.750% senior notes matured. The principal and interest were repaid by the Company using cash on-hand.

At June 30, 2021 and December 31, 2020 we were in compliance with all financial covenants.

Fair Value Measurements

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note 10 — 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:

•

Available-for-sale securities are classified as Level 1 because we use quoted market prices in determining the fair value of these securities.

•

Market values for our derivative instruments have been used to determine the fair value 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 in the fair value hierarchy.

•

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 June 30, 2021 and December 31, 2020:

		Fair Value Measurements on a Recurring Basis at June 30, 2021
	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	$	9	$	—	$	—	$	9
Derivatives:
Derivative financial instruments ⁽ⁱ⁾	Prepaid and other current assets and other non-current assets	$	—	$	7	$	—	$	7
Liabilities:
Contingent consideration:
Contingent consideration ⁽ⁱⁱ⁾	Other current liabilities and other non-current liabilities	$	—	$	—	$	29	$	29
Derivatives:
Derivative financial instruments ⁽ⁱ⁾	Other current liabilities and other non-current liabilities	$	—	$	16	$	—	$	16

		Fair Value Measurements on a Recurring Basis at December 31, 2020
	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	$	8	$	—	$	—	$	8
Derivatives:
Derivative financial instruments ⁽ⁱ⁾	Prepaid and other current assets and other non-current assets	$	—	$	27	$	—	$	27
Liabilities:
Contingent consideration:
Contingent consideration ⁽ⁱⁱ⁾	Other current liabilities and other non-current liabilities	$	—	$	—	$	45	$	45
Derivatives:
Derivative financial instruments ⁽ⁱ⁾	Other current liabilities and other non-current liabilities	$	—	$	7	$	—	$	7

(i)	See Note 8 — Derivative Financial Instruments for further information on our derivative investments.

(ii)

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 10.86% and 9.46% at June 30, 2021 and December 31, 2020, respectively. The range of these discount rates was 3.53% - 13.00% at June 30, 2021. Using different probability weightings and discount rates could result in an increase or decrease of the contingent consideration payable.

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

Fair Value Measurements Using Significant Unobservable Inputs (Level 3)	June 30, 2021
Balance at December 31, 2020	$	45
Obligations assumed		—
Payments		(17	)
Realized and unrealized gains		1
Foreign exchange		—
Balance at June 30, 2021	$	29

There were no significant transfers to or from Level 3 in the six months ended June 30, 2021.

The following tables present our liabilities not measured at fair value on a recurring basis at June 30, 2021 and December 31, 2020:

	June 30, 2021				December 31, 2020
	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Long-term note receivable	$	70	$	73	$	71	$	73
Liabilities:
Current debt	$	1,110	$	1,122	$	971	$	985
Long-term debt	$	3,995	$	4,597	$	4,664	$	5,488

The carrying values of our revolving credit facility and collateralized facility approximate their fair values. 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.

Compensation And Retirement Disclosure [Abstract]

Retirement Benefits

6 Months Ended

Jun. 30, 2021

Retirement Benefits

Note 11 — Retirement Benefits

Defined Benefit Plans and Post-retirement Welfare Plans

Willis Towers Watson sponsors both qualified and non-qualified defined benefit pension plans and other post-retirement welfare (‘PRW’) 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 and Ireland. Together, these disclosed funded and unfunded plans represent 99% of Willis Towers Watson’s pension and PRW obligations and are disclosed herein.

Components of Net Periodic Benefit (Income)/Cost for Defined Benefit Pension and Post-retirement Welfare Plans

The following tables set forth the components of net periodic benefit (income)/cost for the Company’s defined benefit pension and PRW plans for the three and six months ended June 30, 2021 and 2020:

	Three Months Ended June 30,
	2021												2020
	U.S.			U.K.			Other			PRW			U.S.			U.K.			Other			PRW
Service cost	$	20		$	5		$	6		$	—		$	18		$	3		$	5		$	—
Interest cost		24			14			3			1			33			18			3			—
Expected return on plan assets		(77	)		(43	)		(10	)		—			(72	)		(59	)		(9	)		—
Settlement		—			1			—			—			2			1			—			—
Amortization of net loss		11			7			2			1			8			5			2			1
Amortization of prior service credit		—			(5	)		—			(1	)		—			(4	)		—			(1	)
Net periodic benefit (income)/cost	$	(22	)	$	(21	)	$	1		$	1		$	(11	)	$	(36	)	$	1		$	—

	Six Months Ended June 30,
	2021												2020
	U.S.			U.K.			Other			PRW			U.S.			U.K.			Other			PRW
Service cost	$	40		$	9		$	12		$	—		$	36		$	7		$	10		$	—
Interest cost		47			28			6			1			66			36			7			1
Expected return on plan assets		(154	)		(86	)		(19	)		—			(145	)		(121	)		(17	)		—
Settlement		1			1			—			—			2			1			—			—
Amortization of net loss		22			14			3			1			17			11			2			1
Amortization of prior service credit		—			(9	)		—			(2	)		—			(8	)		—			(2	)
Net periodic benefit (income)/cost	$	(44	)	$	(43	)	$	2		$	—		$	(24	)	$	(74	)	$	2		$	—

Employer Contributions to Defined Benefit Pension Plans

The Company made $60 million of contributions to its U.S. plans for the six months ended June 30, 2021 and does not anticipate making any additional contributions over the remainder of the fiscal year. The Company made contributions of $19 million to its U.K. plans for the six months ended June 30, 2021 and anticipates making additional contributions of $24 million for the remainder of the fiscal year. The Company made contributions of $19 million to its other plans for the six months ended June 30, 2021 and anticipates making additional contributions of $6 million for the remainder of the fiscal year.

Defined Contribution Plans

The Company made contributions to its defined contribution plans of $39 million and $82 million during the three and six months ended June 30, 2021, respectively, and $40 million and $83 million during the three and six months ended June 30, 2020, respectively.

The entire disclosure for retirement benefits.

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Commitments And Contingencies Disclosure [Abstract]

Leases

6 Months Ended

Jun. 30, 2021

Leases [Abstract]

Leases

Note 12 — Leases

The following tables present lease costs recorded on our condensed consolidated statements of comprehensive income for the three and six months ended June 30, 2021 and 2020.

	Three Months Ended June 30,						Six Months Ended June 30,
	2021			2020			2021			2020
Finance lease cost:
Amortization of right-of-use assets	$	1		$	—		$	1		$	1
Interest on lease liabilities		—			1			1			2
Operating lease cost		45			46			91			93
Short-term lease cost		1			—			1			—
Variable lease cost		13			13			26			23
Sublease income		(5	)		(5	)		(10	)		(10	)
Total lease cost, net	$	55		$	55		$	110		$	109

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.

Commitments and Contingencies

6 Months Ended

Jun. 30, 2021

Commitments and Contingencies

Note 13 — Commitments and Contingencies

Indemnification Agreements

Willis Towers Watson 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. 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. We expect the impact of claims or demands not described below to be immaterial to the Company’s condensed consolidated financial statements. 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 14 — Supplementary Information for Certain Balance Sheet Accounts for the amounts accrued at June 30, 2021 and December 31, 2020 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 particular quarterly or annual periods. In addition, given the early stages of some litigation or regulatory proceedings described below, it may not be possible to predict their outcomes or resolutions, and it is possible that any one or more of these events may have a material adverse effect on the Company.

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.

WTW/Aon U.S. Department of Justice Lawsuit

On June 16, 2021, the U.S. Department of Justice filed suit in U.S. District Court in the District of Columbia against Willis Towers Watson plc and Aon plc, seeking to enjoin the proposed business combination between the two companies (among other relief). The lawsuit claimed that the proposed combination would violate section 7 of the Clayton Act, 15 USC § 18. Specifically, the lawsuit claimed that the combination would substantially lessen competition in five relevant product markets in the U.S.: (1) property, casualty, and financial risk broking for large customers; (2) health benefits broking for large customers; (3) actuarial services for large single-employer defined benefit pension plans; (4) the operation of private multicarrier retiree exchanges; and (5) reinsurance broking. We disagreed with the Justice Department’s action and believed it reflected a lack of understanding of our business, the clients we serve, and the marketplace in which we operate. Following the Termination on July 26, 2021, the Justice Department filed a notice of dismissal and the court dismissed the case.

Willis Towers Watson Merger-Related Securities Litigation

The Company was named as a defendant in two consolidated actions arising out of the 2016 ‘merger of equals’ between Towers Watson and Willis (the ‘Merger’), consisting of a consolidated shareholder class action pending in the United States District Court for the Eastern District of Virginia, captioned ‘In re Willis Towers Watson plc Proxy Litigation,’ Master File No. 1:17-cv-1338-AJT-JFA (the ‘Federal Action’), and a consolidated putative shareholder class action pending in the Delaware Court of Chancery, captioned ‘In re Towers Watson & Co. Stockholders Litigation,’ C.A. No. 2018-0132-KSJM (the ‘Delaware Action’). The complaints in these actions generally allege that the defendants omitted material information from the proxy disclosures relating to the Merger, including with respect to potential conflicts of interest, and, as a result, that Towers Watson’s stockholders approved the Merger based on inadequate information. Based on these allegations, among others, the complaint in the Federal Action asserts claims under Sections 14(a) and 20(a) of the Securities Exchange Act of 1934, and the complaint in the Delaware Action asserts claims under Delaware state law for breach of fiduciary duty and aiding and abetting breach of fiduciary duty.

On or about November 19, 2020, the parties to the Federal Action and the Delaware Action reached an agreement in principle to resolve the Federal Action and the Delaware Action for $75 million and $15 million, respectively. The Company agreed to the settlement and the payment of the settlement amounts to eliminate the distraction, burden, expense and uncertainty of further litigation. Further, in reaching the settlement, the parties understood and agreed that there is no admission of liability or wrongdoing by the Company or any of the other defendants in either the Federal Action or the Delaware Action. The Company and the other defendants expressly deny any liability or wrongdoing with respect to the matters alleged in the Federal Action and the Delaware Action.

On January 15, 2021, the parties to the Federal Action and the Delaware Action signed formal stipulations of settlement, which memorialized the terms of the agreement in principle, and which the plaintiffs in the Federal Action and the Delaware Action then filed with each of the respective courts. Also on January 15, 2021, the plaintiff in the Federal Action filed a motion to preliminarily approve the settlement. On January 21, 2021 the court in the Federal Action preliminarily approved the settlement, approved the form of notice to be disseminated to class members, and scheduled a final fairness hearing on the settlement for May 21, 2021. On May 21, 2021, following the final fairness hearing, the court in the Federal Action finally approved the settlement. On January 25, 2021 the court in the Delaware Action approved the form of notice to be disseminated to class members and scheduled a final fairness hearing on the settlement for May 25, 2021. On May 25, 2021, following the final fairness hearing, the court in the Delaware Action finally approved the settlement. The Company made the $90 million aggregate settlement payment in escrow in February 2021.

During 2020 the Company recognized $65 million of expense, net of $25 million of insurance and other recoveries. Additional insurance recoveries are possible.

Supplementary Information for Certain Balance Sheet Accounts

6 Months Ended

Jun. 30, 2021

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Supplementary Information for Certain Balance Sheet Accounts

Note 14 — Supplementary Information for Certain Balance Sheet Accounts

Additional details of specific balance sheet accounts are detailed below.

Deferred revenue and accrued expenses consist of the following:

	June 30, 2021		December 31, 2020
Accounts payable, accrued liabilities and deferred income	$	961	$	862
Accrued discretionary and incentive compensation		556		851
Litigation settlements		—		210
Accrued vacation		203		161
Other employee-related liabilities		62		77
Total deferred revenue and accrued expenses	$	1,782	$	2,161

Other current liabilities consists of the following:

	June 30, 2021		December 31, 2020
Dividends payable	$	19	$	103
Income and other taxes payable		116		102
Interest payable		53		68
Deferred compensation plan liabilities		40		57
Contingent and deferred consideration on acquisitions		14		39
Payroll-related liabilities		255		268
Derivatives		16		5
Third-party commissions		191		173
Other current liabilities		47		73
Total other current liabilities	$	751	$	888

Provision for liabilities consists of the following:

	June 30, 2021		December 31, 2020
Claims, lawsuits and other proceedings	$	327	$	325
Other provisions		72		82
Total provision for liabilities	$	399	$	407

Other non-current liabilities consists of the following:

	June 30, 2021		December 31, 2020
Deferred compensation plan liability	$	118	$	117
Contingent and deferred consideration on acquisitions		15		16
Liabilities for uncertain tax positions		47		49
Derivatives		—		2
Finance leases		17		19
Other non-current liabilities		83		109
Total other non-current liabilities	$	280	$	312

Other Income, Net

6 Months Ended

Jun. 30, 2021

Other Income And Expenses [Abstract]

Other Income, Net

Note 15 — Other Income, Net

Other income, net consists of the following:

	Three Months Ended June 30,						Six Months Ended June 30,
	2021			2020			2021		2020
(Loss)/gain on disposal of operations	$	(2	)	$	(2	)	$	357	$	(2	)
Net periodic pension and postretirement benefit credits		72			75			148		151
Interest in earnings of associates and other investments		2			3			4		5
Foreign exchange gain		2			—			4		12
Other		—			—			—		2
Other income, net	$	74		$	76		$	513	$	168

Accumulated Other Comprehensive Loss

6 Months Ended

Jun. 30, 2021

Equity [Abstract]

Accumulated Other Comprehensive Loss

Note 16 — 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 six months ended June 30, 2021 and 2020. These tables exclude 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
	2021			2020			2021			2020			2021			2020			2021			2020
Quarter-to-date activity:
Balance at March 31, 2021 and 2020, respectively	$	(398	)	$	(746	)	$	15		$	(5	)	$	(1,928	)	$	(1,695	)	$	(2,311	)	$	(2,446	)
Other comprehensive income/(loss) before reclassifications		22			48			1			(3	)		(1	)		6			22			51
(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax benefit of $1 and $7, respectively)		—			—			(3	)		2			14			3			11			5
Net current-period other comprehensive income/(loss)		22			48			(2	)		(1	)		13			9			33			56
Balance at June 30, 2021 and 2020, respectively	$	(376	)	$	(698	)	$	13		$	(6	)	$	(1,915	)	$	(1,686	)	$	(2,278	)	$	(2,390	)

Year-to-date activity:
Balance at December 31, 2020 and 2019, respectively	$	(400	)	$	(538	)	$	9		$	13		$	(1,968	)	$	(1,702	)	$	(2,359	)	$	(2,227	)
Other comprehensive (loss)/income before reclassifications		(20	)		(160	)		8			(22	)		—			2			(12	)		(180	)
Loss/(gain) reclassified from accumulated other comprehensive loss (net of income tax benefit of $7 in both 2021 and 2020) ⁽ⁱⁱⁱ⁾		44			—			(4	)		3			53			14			93			17
Net current-period other comprehensive income/(loss)		24			(160	)		4			(19	)		53			16			81			(163	)
Balance at June 30, 2021 and 2020, respectively	$	(376	)	$	(698	)	$	13		$	(6	)	$	(1,915	)	$	(1,686	)	$	(2,278	)	$	(2,390	)

(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 8 — 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 11 — Retirement Benefits). These components are included in Other income, net in the accompanying condensed consolidated statements of comprehensive income.

(iii)

Includes reclassifications of $44 million and $31 million of foreign currency translation and defined pension and post-retirement benefit costs, respectively, attributable to the gain on disposal of our Miller business (see Note 3 — Divestitures). The net gain on disposal is included in Other income, net in the accompanying condensed consolidated statements of comprehensive income.

Earnings Per Share

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Earnings Per Share

Note 17 — Earnings Per Share

Basic and diluted earnings per share are calculated by dividing net income attributable to Willis Towers Watson 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 June 30, 2021 and 2020, there were 0.6 million and 0.5 million restricted performance-based stock units outstanding, respectively, and 0.1 million and 0.2 million time-based share options outstanding, respectively. Additionally, at June 30, 2021 and 2020, there were 0.3 million performance-based options outstanding, and the Company’s restricted time-based stock units were immaterial.

Basic and diluted earnings per share are as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2021			2020			2021			2020
Net income attributable to Willis Towers Watson	$	184		$	94		$	917		$	399

Basic average number of shares outstanding		130			129			130			130
Dilutive effect of potentially issuable shares		—			1			—			—
Diluted average number of shares outstanding		130			130			130			130

Basic earnings per share	$	1.42		$	0.73		$	7.06		$	3.08
Dilutive effect of potentially issuable shares		(0.01	)		(0.01	)		(0.02	)		(0.01	)
Diluted earnings per share	$	1.41		$	0.72		$	7.04		$	3.07

For the three and six months ended June 30, 2021, 0.2 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 restricted stock units for the three and six months ended June 30, 2020. There were no anti-dilutive options for the three and six months ended June 30, 2021 and 2020.

Basis of Presentation and Recent Accounting Pronouncements (Policies)

6 Months Ended

Jun. 30, 2021

Accounting Policies [Abstract]

Basis of Presentation

Risks and Uncertainties Related to the COVID-19 Pandemic

Recent Accounting Pronouncements

Not Yet Adopted

There are no pending accounting pronouncements that are expected to have a significant impact on our condensed consolidated financial statements.

Adopted

Fair Value of Financial Instruments

•

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:

•

Available-for-sale securities are classified as Level 1 because we use quoted market prices in determining the fair value of these securities.

•

Revenue (Tables)

6 Months Ended

Jun. 30, 2021

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 six months ended June 30, 2021 and 2020. Along with reimbursable expenses and other, total revenue by service offering represents our revenue from customer contracts.

	Three Months Ended June 30,
	HCB				CRB				IRR				BDA				Corporate ⁽ⁱ⁾					Total
	2021		2020		2021		2020		2021		2020		2021		2020		2021			2020		2021		2020
Broking	$	83	$	71	$	687	$	637	$	203	$	258	$	121	$	90	$	—		$	—	$	1,094	$	1,056
Consulting		576		531		46		40		115		95		—		—		2			2		739		668
Outsourced administration		124		122		15		16		4		3		121		119		—			—		264		260
Other		50		41		5		1		76		55		—		—		1			1		132		98
Total revenue by service offering		833		765		753		694		398		411		242		209		3			3		2,229		2,082
Reimbursable expenses and other ⁽ⁱ⁾		12		11		1		1		2		1		2		2		(1	)		4		16		19
Total revenue from customer contracts	$	845	$	776	$	754	$	695	$	400	$	412	$	244	$	211	$	2		$	7	$	2,245	$	2,101
Interest and other income ⁽ⁱⁱ⁾		3		2		35		7		2		2		—		—		1			1		41		12
Total revenue	$	848	$	778	$	789	$	702	$	402	$	414	$	244	$	211	$	3		$	8	$	2,286	$	2,113

	Six Months Ended June 30,
	HCB				CRB				IRR				BDA				Corporate ⁽ⁱ⁾					Total
	2021		2020		2021		2020		2021		2020		2021		2020		2021			2020		2021		2020
Broking	$	180	$	154	$	1,404	$	1,285	$	615	$	691	$	273	$	188	$	—		$	—	$	2,472	$	2,318
Consulting		1,170		1,113		90		87		238		188		—		—		4			4		1,502		1,392
Outsourced administration		256		250		40		41		8		6		253		252		—			—		557		549
Other		99		88		9		2		141		138		—		—		2			2		251		230
Total revenue by service offering		1,705		1,605		1,543		1,415		1,002		1,023		526		440		6			6		4,782		4,489
Reimbursable expenses and other ⁽ⁱ⁾		23		26		1		1		3		4		4		5		(6	)		10		25		46
Total revenue from customer contracts	$	1,728	$	1,631	$	1,544	$	1,416	$	1,005	$	1,027	$	530	$	445	$	—		$	16	$	4,807	$	4,535
Interest and other income ⁽ⁱⁱ⁾		6		12		55		25		3		5		3		—		2			2		69		44
Total revenue	$	1,734	$	1,643	$	1,599	$	1,441	$	1,008	$	1,032	$	533	$	445	$	2		$	18	$	4,876	$	4,579

______________

(i)

(ii)

	Three Months Ended June 30,
	HCB				CRB				IRR				BDA				Corporate				Total
	2021		2020		2021		2020		2021		2020		2021		2020		2021		2020		2021		2020
North America	$	477	$	462	$	308	$	296	$	125	$	117	$	239	$	207	$	3	$	2	$	1,152	$	1,084
Great Britain		143		117		173		160		205		207		—		—		—		—		521		484
Western Europe		138		119		144		127		25		49		—		—		—		1		307		296
International		75		67		128		111		43		38		3		2		—		—		249		218
Total revenue by geography	$	833	$	765	$	753	$	694	$	398	$	411	$	242	$	209	$	3	$	3	$	2,229	$	2,082

	Six Months Ended June 30,
	HCB				CRB				IRR				BDA				Corporate				Total
	2021		2020		2021		2020		2021		2020		2021		2020		2021		2020		2021		2020
North America	$	945	$	938	$	555	$	529	$	311	$	287	$	521	$	436	$	5	$	4	$	2,337	$	2,194
Great Britain		290		243		328		297		516		528		—		—		—		—		1,134		1,068
Western Europe		309		275		405		371		84		125		—		—		1		2		799		773
International		161		149		255		218		91		83		5		4		—		—		512		454
Total revenue by geography	$	1,705	$	1,605	$	1,543	$	1,415	$	1,002	$	1,023	$	526	$	440	$	6	$	6	$	4,782	$	4,489

Contract with Customer, Asset and Liability

	June 30, 2021		December 31, 2020
Billed receivables, net of allowance for doubtful accounts of $44 million and $41 million	$	1,728	$	1,697
Unbilled receivables		501		445
Current contract assets		278		413
Accounts receivable, net	$	2,507	$	2,555
Non-current accounts receivable, net	$	19	$	34
Non-current contract assets	$	405	$	329
Deferred revenue	$	638	$	549

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction

•

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 2021				2022				2023 onward				Total
Revenue expected to be recognized on contracts as of June 30, 2021		$	323			$	493			$	649			$	1,465

Segment Information (Tables)

6 Months Ended

Jun. 30, 2021

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 June 30, 2021 and 2020.

	Three Months Ended June 30,
	HCB				CRB				IRR				BDA						Total
	2021		2020		2021		2020		2021		2020		2021			2020			2021		2020
Segment revenue	$	836	$	767	$	788	$	701	$	400	$	413	$	242		$	209		$	2,266	$	2,090

Segment operating income/(loss)	$	192	$	160	$	181	$	135	$	133	$	119	$	(10	)	$	(9	)	$	496	$	405

The following table presents segment revenue and segment operating income for our reportable segments for the six months ended June 30, 2021 and 2020.

	Six Months Ended June 30,
	HCB				CRB				IRR				BDA						Total
	2021		2020		2021		2020		2021		2020		2021			2020			2021		2020
Segment revenue	$	1,711	$	1,617	$	1,598	$	1,440	$	1,005	$	1,028	$	529		$	440		$	4,843	$	4,525

Segment operating income/(loss)	$	412	$	373	$	343	$	262	$	423	$	396	$	(3	)	$	(20	)	$	1,175	$	1,011

Net Operating Income of the Reported Segments

	Three Months Ended June 30,						Six Months Ended June 30,
	2021			2020			2021			2020
Revenue:
Total segment revenue	$	2,266		$	2,090		$	4,843		$	4,525
Reimbursable expenses and other		20			23			33			54
Revenue	$	2,286		$	2,113		$	4,876		$	4,579

Total segment operating income	$	496		$	405		$	1,175		$	1,011
Amortization		(98	)		(119	)		(201	)		(240	)
Transaction and integration expenses ⁽ⁱ⁾		(51	)		(14	)		(75	)		(23	)
Unallocated, net ⁽ⁱⁱ⁾		(87	)		(109	)		(187	)		(225	)
Income from operations		260			163			712			523
Interest expense		(52	)		(62	)		(111	)		(123	)
Other income, net		74			76			513			168
Income from operations before income taxes	$	282		$	177		$	1,114		$	568

(i)	Includes mainly transaction costs related to the proposed Aon combination prior to its termination.

(ii)	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.

Goodwill and Other Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Components of Goodwill

The components of goodwill are outlined below for the six months ended June 30, 2021:

	HCB			CRB			IRR			BDA		Total
Balance at December 31, 2020:
Goodwill, gross	$	4,346		$	2,378		$	1,694		$	3,278	$	11,696
Accumulated impairment losses		(130	)		(362	)		—			—		(492	)
Goodwill, net - December 31, 2020		4,216			2,016			1,694			3,278		11,204
Goodwill disposals		—			—			(188	)		—		(188	)
Foreign exchange		(12	)		(12	)		3			—		(21	)
Balance at June 30, 2021:
Goodwill, gross		4,334			2,366			1,509			3,278		11,487
Accumulated impairment losses		(130	)		(362	)		—			—		(492	)
Goodwill, net - June 30, 2021	$	4,204		$	2,004		$	1,509		$	3,278	$	10,995

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 six months ended June 30, 2021:

	Client relationships			Software			Trademark and trade name			Other			Total
Balance at December 31, 2020:
Intangible assets, gross	$	4,065		$	761		$	1,054		$	108		$	5,988
Accumulated amortization		(2,031	)		(659	)		(220	)		(35	)		(2,945	)
Intangible assets, net - December 31, 2020		2,034			102			834			73			3,043
Intangible asset disposals		(46	)		—			(8	)		—			(54	)
Amortization		(134	)		(37	)		(22	)		(8	)		(201	)
Foreign exchange		(5	)		—			1			2			(2	)
Balance at June 30, 2021:
Intangible assets, gross		3,872			747			1,041			110			5,770
Accumulated amortization		(2,023	)		(682	)		(236	)		(43	)		(2,984	)
Intangible assets, net - June 30, 2021	$	1,849		$	65		$	805		$	67		$	2,786

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 2021 and for subsequent years:

	Amortization
Remainder of 2021	$	171
2022		310
2023		257
2024		226
2025		205
Thereafter		1,617
Total	$	2,786

Derivative Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2021

Designated [Member]

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

	Gain/(loss) recognized in OCI (effective element)
	Three months ended June 30,					Six months ended June 30,
	2021		2020			2021		2020
Forward exchange contracts	$	1	$	(3	)	$	5	$	(27	)

Location of gain/(loss) reclassified from Accumulated OCL into income (effective element)	Gain/(loss) reclassified from Accumulated OCL into income (effective element)
	Three months ended June 30,					Six months ended June 30,
	2021		2020			2021			2020
Revenue	$	—	$	(1	)	$	(2	)	$	(1	)
Salaries and benefits		3		(1	)		6			(3	)
	$	3	$	(2	)	$	4		$	(4	)

Nondesignated [Member]

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

		Loss recognized in income
		Three Months Ended June 30,						Six Months Ended June 30,
Derivatives not designated as hedging instruments:	Location of loss recognized in income	2021			2020			2021			2020
Forward exchange contracts	Other income, net	$	(13	)	$	(8	)	$	(29	)	$	(20	)

Debt (Tables)

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Schedule of Current and Long-term Debt

Current debt consists of the following:

	June 30, 2021		December 31, 2020
Revolving $1.25 billion credit facility ⁽ⁱ⁾	$	—	$	—
5.750% senior notes due 2021		—		500
3.500% senior notes due 2021		450		449
2.125% senior notes due 2022⁽ⁱⁱ⁾		640		—
Current portion of collateralized facility		20		22
	$	1,110	$	971

Long-term debt consists of the following:

	June 30, 2021		December 31, 2020
Revolving $1.25 billion credit facility	$	—	$	—
Collateralized facility ⁽ⁱⁱⁱ⁾		22		33
2.125% senior notes due 2022⁽ⁱⁱ⁾		—		659
4.625% senior notes due 2023		249		249
3.600% senior notes due 2024		647		647
4.400% senior notes due 2026		546		546
4.500% senior notes due 2028		596		596
2.950% senior notes due 2029		727		726
6.125% senior notes due 2043		271		271
5.050% senior notes due 2048		395		395
3.875% senior notes due 2049		542		542
	$	3,995	$	4,664

(i)	The $1.25 billion revolving credit facility expires on March 7, 2022.

(ii)	Notes issued in Euro (€540 million).

(iii)

At June 30, 2021 and December 31, 2020, the Company had $87 million and $98 million, respectively, of renewal commissions receivables pledged as collateral for this facility.

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2021

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 June 30, 2021 and December 31, 2020:

		Fair Value Measurements on a Recurring Basis at June 30, 2021
	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	$	9	$	—	$	—	$	9
Derivatives:
Derivative financial instruments ⁽ⁱ⁾	Prepaid and other current assets and other non-current assets	$	—	$	7	$	—	$	7
Liabilities:
Contingent consideration:
Contingent consideration ⁽ⁱⁱ⁾	Other current liabilities and other non-current liabilities	$	—	$	—	$	29	$	29
Derivatives:
Derivative financial instruments ⁽ⁱ⁾	Other current liabilities and other non-current liabilities	$	—	$	16	$	—	$	16

		Fair Value Measurements on a Recurring Basis at December 31, 2020
	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	$	8	$	—	$	—	$	8
Derivatives:
Derivative financial instruments ⁽ⁱ⁾	Prepaid and other current assets and other non-current assets	$	—	$	27	$	—	$	27
Liabilities:
Contingent consideration:
Contingent consideration ⁽ⁱⁱ⁾	Other current liabilities and other non-current liabilities	$	—	$	—	$	45	$	45
Derivatives:
Derivative financial instruments ⁽ⁱ⁾	Other current liabilities and other non-current liabilities	$	—	$	7	$	—	$	7

(i)	See Note 8 — Derivative Financial Instruments for further information on our derivative investments.

(ii)

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)	June 30, 2021
Balance at December 31, 2020	$	45
Obligations assumed		—
Payments		(17	)
Realized and unrealized gains		1
Foreign exchange		—
Balance at June 30, 2021	$	29

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 June 30, 2021 and December 31, 2020:

	June 30, 2021				December 31, 2020
	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Long-term note receivable	$	70	$	73	$	71	$	73
Liabilities:
Current debt	$	1,110	$	1,122	$	971	$	985
Long-term debt	$	3,995	$	4,597	$	4,664	$	5,488

Retirement Benefits (Tables)

6 Months Ended

Jun. 30, 2021

Compensation And Retirement Disclosure [Abstract]

Schedule of Net Periodic Benefit Cost

	Three Months Ended June 30,
	2021												2020
	U.S.			U.K.			Other			PRW			U.S.			U.K.			Other			PRW
Service cost	$	20		$	5		$	6		$	—		$	18		$	3		$	5		$	—
Interest cost		24			14			3			1			33			18			3			—
Expected return on plan assets		(77	)		(43	)		(10	)		—			(72	)		(59	)		(9	)		—
Settlement		—			1			—			—			2			1			—			—
Amortization of net loss		11			7			2			1			8			5			2			1
Amortization of prior service credit		—			(5	)		—			(1	)		—			(4	)		—			(1	)
Net periodic benefit (income)/cost	$	(22	)	$	(21	)	$	1		$	1		$	(11	)	$	(36	)	$	1		$	—

	Six Months Ended June 30,
	2021												2020
	U.S.			U.K.			Other			PRW			U.S.			U.K.			Other			PRW
Service cost	$	40		$	9		$	12		$	—		$	36		$	7		$	10		$	—
Interest cost		47			28			6			1			66			36			7			1
Expected return on plan assets		(154	)		(86	)		(19	)		—			(145	)		(121	)		(17	)		—
Settlement		1			1			—			—			2			1			—			—
Amortization of net loss		22			14			3			1			17			11			2			1
Amortization of prior service credit		—			(9	)		—			(2	)		—			(8	)		—			(2	)
Net periodic benefit (income)/cost	$	(44	)	$	(43	)	$	2		$	—		$	(24	)	$	(74	)	$	2		$	—

Leases (Tables)

6 Months Ended

Jun. 30, 2021

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 six months ended June 30, 2021 and 2020.

	Three Months Ended June 30,						Six Months Ended June 30,
	2021			2020			2021			2020
Finance lease cost:
Amortization of right-of-use assets	$	1		$	—		$	1		$	1
Interest on lease liabilities		—			1			1			2
Operating lease cost		45			46			91			93
Short-term lease cost		1			—			1			—
Variable lease cost		13			13			26			23
Sublease income		(5	)		(5	)		(10	)		(10	)
Total lease cost, net	$	55		$	55		$	110		$	109

Supplementary Information for Certain Balance Sheet Accounts (Tables)

6 Months Ended

Jun. 30, 2021

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Deferred Revenue and Accrued Expenses

Deferred revenue and accrued expenses consist of the following:

	June 30, 2021		December 31, 2020
Accounts payable, accrued liabilities and deferred income	$	961	$	862
Accrued discretionary and incentive compensation		556		851
Litigation settlements		—		210
Accrued vacation		203		161
Other employee-related liabilities		62		77
Total deferred revenue and accrued expenses	$	1,782	$	2,161

Schedule of Other Current Liabilities

Other current liabilities consists of the following:

	June 30, 2021		December 31, 2020
Dividends payable	$	19	$	103
Income and other taxes payable		116		102
Interest payable		53		68
Deferred compensation plan liabilities		40		57
Contingent and deferred consideration on acquisitions		14		39
Payroll-related liabilities		255		268
Derivatives		16		5
Third-party commissions		191		173
Other current liabilities		47		73
Total other current liabilities	$	751	$	888

Provisions for Liabilities

Provision for liabilities consists of the following:

	June 30, 2021		December 31, 2020
Claims, lawsuits and other proceedings	$	327	$	325
Other provisions		72		82
Total provision for liabilities	$	399	$	407

Schedule of Other Non-current Liabilities

Other non-current liabilities consists of the following:

	June 30, 2021		December 31, 2020
Deferred compensation plan liability	$	118	$	117
Contingent and deferred consideration on acquisitions		15		16
Liabilities for uncertain tax positions		47		49
Derivatives		—		2
Finance leases		17		19
Other non-current liabilities		83		109
Total other non-current liabilities	$	280	$	312

Other Income, Net (Tables)

6 Months Ended

Jun. 30, 2021

Other Income And Expenses [Abstract]

Schedule of Other Nonoperating Income

Other income, net consists of the following:

	Three Months Ended June 30,						Six Months Ended June 30,
	2021			2020			2021		2020
(Loss)/gain on disposal of operations	$	(2	)	$	(2	)	$	357	$	(2	)
Net periodic pension and postretirement benefit credits		72			75			148		151
Interest in earnings of associates and other investments		2			3			4		5
Foreign exchange gain		2			—			4		12
Other		—			—			—		2
Other income, net	$	74		$	76		$	513	$	168

Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jun. 30, 2021

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

	Foreign currency translation ⁽ⁱ⁾						Derivative instruments⁽ⁱ⁾						Defined pension and post-retirement benefit costs ⁽ⁱⁱ⁾						Total
	2021			2020			2021			2020			2021			2020			2021			2020
Quarter-to-date activity:
Balance at March 31, 2021 and 2020, respectively	$	(398	)	$	(746	)	$	15		$	(5	)	$	(1,928	)	$	(1,695	)	$	(2,311	)	$	(2,446	)
Other comprehensive income/(loss) before reclassifications		22			48			1			(3	)		(1	)		6			22			51
(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax benefit of $1 and $7, respectively)		—			—			(3	)		2			14			3			11			5
Net current-period other comprehensive income/(loss)		22			48			(2	)		(1	)		13			9			33			56
Balance at June 30, 2021 and 2020, respectively	$	(376	)	$	(698	)	$	13		$	(6	)	$	(1,915	)	$	(1,686	)	$	(2,278	)	$	(2,390	)

Year-to-date activity:
Balance at December 31, 2020 and 2019, respectively	$	(400	)	$	(538	)	$	9		$	13		$	(1,968	)	$	(1,702	)	$	(2,359	)	$	(2,227	)
Other comprehensive (loss)/income before reclassifications		(20	)		(160	)		8			(22	)		—			2			(12	)		(180	)
Loss/(gain) reclassified from accumulated other comprehensive loss (net of income tax benefit of $7 in both 2021 and 2020) ⁽ⁱⁱⁱ⁾		44			—			(4	)		3			53			14			93			17
Net current-period other comprehensive income/(loss)		24			(160	)		4			(19	)		53			16			81			(163	)
Balance at June 30, 2021 and 2020, respectively	$	(376	)	$	(698	)	$	13		$	(6	)	$	(1,915	)	$	(1,686	)	$	(2,278	)	$	(2,390	)

(i)

(ii)	Reclassification adjustments from accumulated other comprehensive loss are included in the computation of net periodic pension cost (see Note 11 — Retirement Benefits). These components are included in Other income, net in the accompanying condensed consolidated statements of comprehensive income.

(iii)

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Earnings Per Share

Basic and diluted earnings per share are as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2021			2020			2021			2020
Net income attributable to Willis Towers Watson	$	184		$	94		$	917		$	399

Basic average number of shares outstanding		130			129			130			130
Dilutive effect of potentially issuable shares		—			1			—			—
Diluted average number of shares outstanding		130			130			130			130

Basic earnings per share	$	1.42		$	0.73		$	7.06		$	3.08
Dilutive effect of potentially issuable shares		(0.01	)		(0.01	)		(0.02	)		(0.01	)
Diluted earnings per share	$	1.41		$	0.72		$	7.04		$	3.07

Nature of Operations (Details) $ in Billions	Jul. 26, 2021 USD ($)	Jun. 30, 2021 Employee Country
Minority Interest [Line Items]
Number of employees employed (more than 00,000) \| Employee		46,000
Number of countries in which entity operates (more than 140) \| Country		140
Termination of Proposed Combination with AON Plc [Member]
Minority Interest [Line Items]
Number of shares receivable upon acquisition		1.08
Termination of Proposed Combination with AON Plc [Member] \| Subsequent Event \| Termination Agreement
Minority Interest [Line Items]
Termination fee \| $	$ 1
Termination of Proposed Combination with AON Plc [Member] \| Aon Plc [Member]
Minority Interest [Line Items]
Percentage of ownership by parent		63.00%
Termination of Proposed Combination with AON Plc [Member] \| Willis Towers Watson Public Limited Company [Member]
Minority Interest [Line Items]
Percentage of ownership by non-controlling owner		37.00%

Divestitures - Termination of Potential Divestiture Related to the Aon Combination (Details) $ in Millions	May 12, 2021 USD ($)
Gallagher [Member] \| Proposed [Member] \| Terminated [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total consideration received from sale of subsidiary	$ 3,570

Divestitures - Miller Divestiture (Details) £ in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Mar. 01, 2021 USD ($)	Mar. 01, 2021 GBP (£)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Tax exempt gain on sale	$ 357	$ (2)
Miller [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Final total consideration received from sale of subsidiary			$ 818	£ 623
Miller [Member] \| Other Income, Net [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Tax exempt gain on sale	$ 356

Divestitures - Max Matthiessen Divestiture (Details) kr in Millions, $ in Millions	1 Months Ended	6 Months Ended
	Sep. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2020 SEK (kr)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Tax exempt gain on sale		$ 357	$ (2)
Max Matthiessen [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total consideration received from sale of subsidiary	$ 262			kr 2,300
Notes receivable repayable by purchaser	68			kr 600
Max Matthiessen [Member] \| Other Income, Net [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Tax exempt gain on sale	$ 86
Max Matthiessen [Member] \| Minimum [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Disposal group including discontinued operation notes payable interest rate	5.00%
Max Matthiessen [Member] \| Maximum [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Disposal group including discontinued operation notes payable interest rate	10.00%

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

3 Months Ended

6 Months Ended

Jun. 30, 2021

Jun. 30, 2020

Jun. 30, 2021

Jun. 30, 2020

Revenue from Contract with Customer, Excluding Assessed Tax

$ 2,245

$ 2,101

$ 4,807

$ 4,535

^[1]

^[2]

2,286

2,113

4,876

4,579

HCB [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

845

776

1,728

1,631

^[1]

^[2]

848

778

1,734

1,643

CRB [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

754

695

1,544

1,416

^[1]

^[2]

789

702

1,599

1,441

IRR [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

400

412

1,005

1,027

^[1]

^[2]

402

414

1,008

1,032

BDA [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

244

211

530

445

^[1]

^[2]

244

211

533

445

Corporate, Non-Segment

Revenue from Contract with Customer, Excluding Assessed Tax

^[1]

^[1]

(1)

(6)

^[1],[2]

^[1]

Broking [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

1,094

1,056

2,472

2,318

Broking [Member] | HCB [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

180

154

Broking [Member] | CRB [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

687

637

1,404

1,285

Broking [Member] | IRR [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

203

258

615

691

Broking [Member] | BDA [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

121

273

188

Consulting [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

739

668

1,502

1,392

Consulting [Member] | HCB [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

576

531

1,170

1,113

Consulting [Member] | CRB [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Consulting [Member] | IRR [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

115

238

188

Consulting [Member] | Corporate, Non-Segment

Revenue from Contract with Customer, Excluding Assessed Tax

^[1]

Outsourced administration [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

264

260

557

549

Outsourced administration [Member] | HCB [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

124

122

256

250

Outsourced administration [Member] | CRB [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Outsourced administration [Member] | IRR [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Outsourced administration [Member] | BDA [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

121

119

253

252

Other [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

132

251

230

Other [Member] | HCB [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Other [Member] | CRB [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

Other [Member] | IRR [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

141

138

Other [Member] | Corporate, Non-Segment

Revenue from Contract with Customer, Excluding Assessed Tax

^[1]

Service

Revenue from Contract with Customer, Excluding Assessed Tax

2,229

2,082

4,782

4,489

Service | HCB [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

833

765

1,705

1,605

Service | CRB [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

753

694

1,543

1,415

Service | IRR [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

398

411

1,002

1,023

Service | BDA [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

242

209

526

440

Service | Corporate, Non-Segment

Revenue from Contract with Customer, Excluding Assessed Tax

^[1]

$ 3

$ 6

[1]	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.
[2]	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 increase in CRB’s interest and other income resulted from book-of-business sales.

Revenue - Schedule of Revenue by Geography (Detail) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2021

Jun. 30, 2020

Jun. 30, 2021

Jun. 30, 2020

Revenue from Contract with Customer, Excluding Assessed Tax

$ 2,245

$ 2,101

$ 4,807

$ 4,535

Service

Revenue from Contract with Customer, Excluding Assessed Tax

2,229

2,082

4,782

4,489

Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

2,229

2,082

4,782

4,489

Corporate, Non-Segment

Revenue from Contract with Customer, Excluding Assessed Tax

^[1]

Corporate, Non-Segment | Service

Revenue from Contract with Customer, Excluding Assessed Tax

^[1]

HCB [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

845

776

1,728

1,631

HCB [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

833

765

1,705

1,605

HCB [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

833

765

1,705

1,605

CRB [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

754

695

1,544

1,416

CRB [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

753

694

1,543

1,415

CRB [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

753

694

1,543

1,415

IRR [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

400

412

1,005

1,027

IRR [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

398

411

1,002

1,023

IRR [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

398

411

1,002

1,023

BDA [Member]

Revenue from Contract with Customer, Excluding Assessed Tax

244

211

530

445

BDA [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

242

209

526

440

BDA [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

242

209

526

440

North America [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

1,152

1,084

2,337

2,194

North America [Member] | Corporate, Non-Segment | Service

Revenue from Contract with Customer, Excluding Assessed Tax

North America [Member] | HCB [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

477

462

945

938

North America [Member] | CRB [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

308

296

555

529

North America [Member] | IRR [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

125

117

311

287

North America [Member] | BDA [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

239

207

521

436

Great Britain [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

521

484

1,134

1,068

Great Britain [Member] | HCB [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

143

117

290

243

Great Britain [Member] | CRB [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

173

160

328

297

Great Britain [Member] | IRR [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

205

207

516

528

Western Europe [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

307

296

799

773

Western Europe [Member] | Corporate, Non-Segment | Service

Revenue from Contract with Customer, Excluding Assessed Tax

Western Europe [Member] | HCB [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

138

119

309

275

Western Europe [Member] | CRB [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

144

127

405

371

Western Europe [Member] | IRR [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

125

International [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

249

218

512

454

International [Member] | HCB [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

161

149

International [Member] | CRB [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

128

111

255

218

International [Member] | IRR [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

International [Member] | BDA [Member] | Operating Segments [Member] | Service

Revenue from Contract with Customer, Excluding Assessed Tax

$ 3

$ 2

$ 5

$ 4

[1]

Revenue - Schedule of Contract Balances (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Revenue From Contract With Customer [Abstract]
Billed Receivable, Current	$ 1,728	$ 1,697
Unbilled Receivable, Current	501	445
Contract asset, Current	278	413
Accounts receivable, net	2,507	2,555
Non-current accounts receivable, net	19	34
Contract asset, Noncurrent	405	329
Deferred revenue	$ 638	$ 549

Revenue - Schedule of Contract Balances (Parenthetical) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Revenue From Contract With Customer [Abstract]
Allowance for doubtful debts	$ 44	$ 41

Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Revenue - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2021
Disaggregation Of Revenue [Line Items]
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 17	$ 46
December 31 2020 [Member]
Disaggregation Of Revenue [Line Items]
Contract with Customer, Liability, Revenue Recognized	94	$ 369
March 31 2021 [Member]
Disaggregation Of Revenue [Line Items]
Contract with Customer, Liability, Revenue Recognized	$ 261

Revenue - Schedule of Remaining Performance Obligations (Details) $ in Millions	Jun. 30, 2021 USD ($)
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 1,465
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-07-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 323
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 493
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 649
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

Revenue - Schedule of Remaining Performance Obligations (Details1) $ in Millions	Jun. 30, 2021 USD ($)
Revenue From Contract With Customer [Abstract]
Revenue, Remaining Performance Obligation	$ 1,465

Segment Information - Narrative (Details)	6 Months Ended
Segment Information - Narrative (Details)	Jun. 30, 2021 segment
Segment Reporting [Abstract]
Number of operating segments	4
Number of reportable segments	4

Segment Information - Revenue (Net of Reimbursable Expenses) of the Reported Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 2,286	$ 2,113	$ 4,876	$ 4,579
Income from operations	260	163	712	523
HCB [Member]
Segment Reporting Information [Line Items]
Revenues	848	778	1,734	1,643
CRB [Member]
Segment Reporting Information [Line Items]
Revenues	789	702	1,599	1,441
IRR [Member]
Segment Reporting Information [Line Items]
Revenues	402	414	1,008	1,032
BDA [Member]
Segment Reporting Information [Line Items]
Revenues	244	211	533	445
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	2,266	2,090	4,843	4,525
Income from operations	496	405	1,175	1,011
Operating Segments [Member] \| HCB [Member]
Segment Reporting Information [Line Items]
Revenues	836	767	1,711	1,617
Income from operations	192	160	412	373
Operating Segments [Member] \| CRB [Member]
Segment Reporting Information [Line Items]
Revenues	788	701	1,598	1,440
Income from operations	181	135	343	262
Operating Segments [Member] \| IRR [Member]
Segment Reporting Information [Line Items]
Revenues	400	413	1,005	1,028
Income from operations	133	119	423	396
Operating Segments [Member] \| BDA [Member]
Segment Reporting Information [Line Items]
Revenues	242	209	529	440
Income from operations	$ (10)	$ (9)	$ (3)	$ (20)

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).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 3
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Segment Information - Reconciliation of Information Reported by Segment to Condensed Consolidated Statement of Comprehensive Income Amounts (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2021

Jun. 30, 2020

Jun. 30, 2021

Jun. 30, 2020

Revenue:

Income/(loss) from operations

$ 2,286

$ 2,113

$ 4,876

$ 4,579

260

163

712

523

Amortization

(98)

(119)

(201)

(240)

Interest expense

(52)

(62)

(111)

(123)

Other income, net

513

168

Income from operations before income taxes

282

177

1,114

568

Operating Segments [Member]

Revenue:

Income/(loss) from operations

2,266

2,090

4,843

4,525

496

405

1,175

1,011

Segment Reconciling Items [Member]

Revenue:

Transaction and integration expenses

Amortization

(98)

(119)

(201)

(240)

^[1]

(51)

(14)

(75)

(23)

Unallocated, net

^[2]

(87)

(109)

(187)

(225)

Interest expense

(52)

(62)

(111)

(123)

Other income, net

$ 74

$ 76

$ 513

$ 168

[1]	Includes mainly transaction costs related to the proposed Aon combination prior to its termination.
[2]	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.

Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating Loss Carryforwards [Line Items]
Provision for income taxes	$ 96	$ 75	$ 192	$ 153
Effective tax rate	33.80%	42.20%	17.20%	26.90%
Liabilities for uncertain tax positions	$ 47		$ 47
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Expected decrease in liability for uncertain tax position	3		3
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Expected decrease in liability for uncertain tax position	8		$ 8
U.K.
Operating Loss Carryforwards [Line Items]
Deferred tax expense	$ 40

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

Goodwill and Other Intangible Assets - Components of Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	$ 11,696
Accumulated impairment losses, beginning balance	(492)
Goodwill, net, beginning balance	11,204
Goodwill disposals	(188)
Foreign exchange	(21)
Goodwill, gross, ending balance	11,487
Accumulated impairment losses, ending balance	(492)
Goodwill, net, ending balance	10,995
HCB [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	4,346
Accumulated impairment losses, beginning balance	(130)
Goodwill, net, beginning balance	4,216
Goodwill disposals	0
Foreign exchange	(12)
Goodwill, gross, ending balance	4,334
Accumulated impairment losses, ending balance	(130)
Goodwill, net, ending balance	4,204
CRB [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	2,378
Accumulated impairment losses, beginning balance	(362)
Goodwill, net, beginning balance	2,016
Goodwill disposals	0
Foreign exchange	(12)
Goodwill, gross, ending balance	2,366
Accumulated impairment losses, ending balance	(362)
Goodwill, net, ending balance	2,004
IRR [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	1,694
Accumulated impairment losses, beginning balance	0
Goodwill, net, beginning balance	1,694
Goodwill disposals	(188)
Foreign exchange	3
Goodwill, gross, ending balance	1,509
Accumulated impairment losses, ending balance	0
Goodwill, net, ending balance	1,509
BDA [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	3,278
Accumulated impairment losses, beginning balance	0
Goodwill, net, beginning balance	3,278
Goodwill disposals	0
Foreign exchange	0
Goodwill, gross, ending balance	3,278
Accumulated impairment losses, ending balance	0
Goodwill, net, ending balance	$ 3,278

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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	$ 5,770		$ 5,770		$ 5,988
Finite-lived intangible assets, accumulated amortization	(2,984)		(2,984)		(2,945)
Finite-lived intangible assets, net amount	2,786		2,786		3,043
Intangible asset disposals			(54)
Amortization	(98)	$ (119)	(201)	$ (240)
Foreign exchange			(2)
Client relationships [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	3,872		3,872		4,065
Finite-lived intangible assets, accumulated amortization	(2,023)		(2,023)		(2,031)
Finite-lived intangible assets, net amount	1,849		1,849		2,034
Intangible asset disposals			(46)
Amortization			(134)
Foreign exchange			(5)
Software [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	747		747		761
Finite-lived intangible assets, accumulated amortization	(682)		(682)		(659)
Finite-lived intangible assets, net amount	65		65		102
Intangible asset disposals			0
Amortization			(37)
Foreign exchange			0
Trademark and trade name [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	1,041		1,041		1,054
Finite-lived intangible assets, accumulated amortization	(236)		(236)		(220)
Finite-lived intangible assets, net amount	805		805		834
Intangible asset disposals			(8)
Amortization			(22)
Foreign exchange			1
Other [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	110		110		108
Finite-lived intangible assets, accumulated amortization	(43)		(43)		(35)
Finite-lived intangible assets, net amount	$ 67		67		$ 73
Intangible asset disposals			0
Amortization			(8)
Foreign exchange			$ 2

Goodwill and Other Intangible Assets - Narrative (Details)	6 Months Ended
	Jun. 30, 2021
Finite-lived Intangible Assets [Roll Forward]
Weighted average remaining life of amortizable intangible assets	13 years 2 months 12 days

Goodwill and Other Intangible Assets - Schedule of Future Estimated Amortization Expense for Amortizable Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Remainder of 2021	$ 171
2022	310
2023	257
2024	226
2025	205
Thereafter	1,617
Total	$ 2,786	$ 3,043

Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Gains on derivatives to be reclassified within the next twelve months	$ 4
Maximum [Member]
Derivative [Line Items]
Longest outstanding maturity	1 year 6 months
Not Designated as Hedging Instrument [Member] \| Foreign exchange contracts [Member]
Derivative [Line Items]
Derivative, notional amount	$ 1,600	$ 1,500
Derivative asset, fair value		15
Derivative liability, fair value	14
Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member] \| Miller [Member]
Derivative [Line Items]
Derivative, notional amount		27
Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member] \| Foreign exchange contracts [Member]
Derivative [Line Items]
Derivative, notional amount	186	340
Derivative asset, fair value	$ 5	$ 5

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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative [Line Items]
Gain/(loss) recognized in OCI (effective element)	$ 1	$ (3)	$ 5	$ (27)
Gain/(loss) reclassified from Accumulated OCL into income (effective element)	3	(2)	4	(4)
Revenue [Member]
Derivative [Line Items]
Gain/(loss) reclassified from Accumulated OCL into income (effective element)		(1)	(2)	(1)
Salaries and Benefits [Member]
Derivative [Line Items]
Gain/(loss) reclassified from Accumulated OCL into income (effective element)	$ 3	$ (1)	$ 6	$ (3)

Derivative Financial Instruments - Schedule Of Derivative Instruments, Effect on Condensed Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other income, net [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign exchange contracts [Member]
Derivative [Line Items]
Loss recognized in income	$ (13)	$ (8)	$ (29)	$ (20)

Debt - Schedule of Current and Long-term Debt (Details)
€ in Millions

6 Months Ended

12 Months Ended

Jun. 30, 2021

USD ($)

Dec. 31, 2020

USD ($)

Jun. 30, 2021

EUR (€)

Mar. 31, 2021

$ 1,110,000,000

$ 971,000,000

Revolving 1.25 Billion Dollar Credit Facility [Member] | Revolving Credit Facility [Member]

3,995,000,000

4,664,000,000

Maximum borrowing capacity

^[1]

$ 1,250,000,000

Line of credit maturity date

Mar. 07, 2022

5.750% senior notes due 2021 [Member]

$ 500,000,000

5.75%

3.500% senior notes due 2021 [Member]

2021

$ 450,000,000

$ 449,000,000

3.50%

Collateralized Facility [Member]

2021

Current portion of long term debt

$ 20,000,000

$ 22,000,000

Renewal commissions receivables pledged as collateral

^[2]

22,000,000

33,000,000

87,000,000

$ 98,000,000

2.125% senior notes due 2022 [Member]

^[3]

$ 640,000,000

^[3]

2.125%

^[3]

2022

4.625% senior notes due 2023 [Member]

$ 659,000,000

^[3]

€ 540

4.625%

2023

3.600% senior notes due 2024 [Member]

$ 249,000,000

3.60%

2024

4.400% senior notes due 2026 [Member]

$ 647,000,000

4.40%

2026

4.500% senior notes due 2028 [Member]

$ 546,000,000

4.50%

2028

2.950% senior notes due 2029 [Member]

$ 596,000,000

2.95%

2029

6.125% senior notes due 2043 [Member]

$ 727,000,000

$ 726,000,000

6.125%

2043

5.050% senior notes due 2048 [Member]

$ 271,000,000

5.05%

2048

3.875% senior notes due 2049 [Member]

$ 395,000,000

3.875%

2049

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

$ 542,000,000

[1]	The $1.25 billion revolving credit facility expires on March 7, 2022.
[2]	At June 30, 2021 and December 31, 2020, the Company had $87 million and $98 million, respectively, of renewal commissions receivables pledged as collateral for this facility.
[3]	Notes issued in Euro (€540 million).

Debt - Narrative (Details) - 5.750% senior notes due 2021 [Member] - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Debt instrument principal and interest payment		$ 500
Stated interest rate	5.75%	5.75%	5.75%

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

Jun. 30, 2021

USD ($)

Dec. 31, 2020

USD ($)

Fair value inputs, weighted-average discount rate

0.1086

0.0946

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

0.1300

Recurring [Member]

Assets:

$ 9

$ 8

^[1]

^[2]

Recurring [Member] | Level 1 [Member]

^[1]

Assets:

^[1]

^[2]

Recurring [Member] | Level 2 [Member]

^[1]

Assets:

^[1]

^[2]

Recurring [Member] | Level 3 [Member]

^[1]

Assets:

^[1]

^[2]

^[1]

$ 0

[1]

See Note 8 — Derivative Financial Instruments for further information on our derivative investments.

[2]

Fair Value Measurements - Fair Value Liabilities Measured Using Significant Unobservable Inputs Level 3 (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance as of beginning of period	$ 45
Obligations assumed	0
Payments	(17)
Realized and unrealized gains	1
Foreign exchange	0
Balance as of end of period	$ 29

Fair Value Measurements - Narrative (Details)	6 Months Ended
Fair Value Measurements - Narrative (Details)	Jun. 30, 2021 USD ($)
Fair Value Disclosures [Abstract]
Fair value significant transfers to or from Level 3	$ 0

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	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current debt	$ 1,110	$ 971
Long-term debt	3,995	4,664
Carrying Value [Member] \| Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term note receivable	70	71
Current debt	1,110	971
Long-term debt	3,995	4,664
Fair Value [Member] \| Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term note receivable	73	73
Current debt	1,122	985
Long-term debt	$ 4,597	$ 5,488

Retirement Benefits - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
Retirement Benefits - Narrative (Details) - USD ($)	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Compensation and Retirement Disclosure [Line Items]
Portion of pension and OPEB obligation attributed to disclosed plans (as a percent)			99.00%
Defined contribution plan, employer contribution	$ 39,000,000	$ 40,000,000	$ 82,000,000	$ 83,000,000
Pension Plan [Member] \| United States [Member]
Compensation and Retirement Disclosure [Line Items]
Defined benefit pension plans, employer contributions			60,000,000
Defined benefit plan, estimated future employer additional contributions, remainder of fiscal year	0		0
Pension Plan [Member] \| United Kingdom [Member]
Compensation and Retirement Disclosure [Line Items]
Defined benefit pension plans, employer contributions			19,000,000
Defined benefit plan, estimated future employer additional contributions, remainder of fiscal year	24,000,000		24,000,000
Pension Plan [Member] \| Other Foreign Plans [Member]
Compensation and Retirement Disclosure [Line Items]
Defined benefit pension plans, employer contributions			19,000,000
Defined benefit plan, estimated future employer additional contributions, remainder of fiscal year	$ 6,000,000		$ 6,000,000

Amount of contribution received by defined benefit plan from employer which increases plan assets.

Retirement Benefits - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Pension Plan [Member] \| United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 20	$ 18	$ 40	$ 36
Interest cost	24	33	47	66
Expected return on plan assets	(77)	(72)	(154)	(145)
Settlement	0	2	1	2
Amortization of net loss	11	8	22	17
Amortization of prior service credit	0	0	0	0
Net periodic benefit (income)/cost	(22)	(11)	(44)	(24)
Pension Plan [Member] \| United Kingdom [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	3	9	7
Interest cost	14	18	28	36
Expected return on plan assets	(43)	(59)	(86)	(121)
Settlement	1	1	1	1
Amortization of net loss	7	5	14	11
Amortization of prior service credit	(5)	(4)	(9)	(8)
Net periodic benefit (income)/cost	(21)	(36)	(43)	(74)
Pension Plan [Member] \| Other Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	5	12	10
Interest cost	3	3	6	7
Expected return on plan assets	(10)	(9)	(19)	(17)
Settlement	0	0	0	0
Amortization of net loss	2	2	3	2
Amortization of prior service credit	0	0	0	0
Net periodic benefit (income)/cost	1	1	2	2
PRW [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	1	0	1	1
Expected return on plan assets	0	0	0	0
Settlement	0	0	0	0
Amortization of net loss	1	1	1	1
Amortization of prior service credit	(1)	(1)	(2)	(2)
Net periodic benefit (income)/cost	$ 1	$ 0	$ 0	$ 0

Leases - Schedule of Lease Costs Recorded in Condensed Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Finance lease cost:
Amortization of right-of-use assets	$ 1		$ 1	$ 1
Interest on lease liabilities		$ 1	1	2
Operating lease cost	45	46	91	93
Short-term lease cost	1		1
Variable lease cost	13	13	26	23
Sublease income	(5)	(5)	(10)	(10)
Total lease cost, net	$ 55	$ 55	$ 110	$ 109

Commitments and Contingencies - Narrative (Details) - Settled Litigation [Member] - Merger-Related Securities Litigation [Member] - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	Nov. 19, 2020	Feb. 28, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Provision for litigation losses			$ 65
Litigation settlement amount		$ 90
Insurance recovery receivables			$ 25
Federal Action [Member]
Loss Contingencies [Line Items]
Litigation settlement amount	$ 75
Delaware Action [Member]
Loss Contingencies [Line Items]
Litigation settlement amount	$ 15

Supplementary Information for Certain Balance Sheet Accounts - Deferred Revenue and Accrued Expenses (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Accounts payable, accrued liabilities and deferred income	$ 961	$ 862
Accrued discretionary and incentive compensation	556	851
Litigation settlements		210
Accrued vacation	203	161
Other employee-related liabilities	62	77
Total deferred revenue and accrued expenses	$ 1,782	$ 2,161

Supplementary Information for Certain Balance Sheet Accounts - Other Current Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Dividends payable	$ 19	$ 103
Income and other taxes payable	116	102
Interest payable	53	68
Deferred compensation plan liabilities	40	57
Contingent and deferred consideration on acquisitions	14	39
Payroll-related liabilities	255	268
Derivatives	16	5
Third-party commissions	191	173
Other current liabilities	47	73
Total other current liabilities	$ 751	$ 888

Supplementary Information for Certain Balance Sheet Accounts - Provision For Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Claims, lawsuits and other proceedings	$ 327	$ 325
Other provisions	72	82
Total provision for liabilities	$ 399	$ 407

Supplementary Information for Certain Balance Sheet Accounts - Other Non-current Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Deferred compensation plan liability	$ 118	$ 117
Contingent and deferred consideration on acquisitions	15	16
Liabilities for uncertain tax positions	47	49
Derivatives		2
Finance leases	17	19
Other non-current liabilities	83	109
Total other non-current liabilities	$ 280	$ 312

Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Other Income, Net (Details) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Income And Expenses [Abstract]
(Loss)/gain on disposal of operations	$ (2)	$ (2)	$ 357	$ (2)
Net periodic pension and postretirement benefit credits	72	75	148	151
Interest in earnings of associates and other investments	2	3	4	5
Foreign exchange gain	2		4	12
Other				2
Other income, net	$ 74	$ 76	$ 513	$ 168

Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance			$ 10,820
Stockholders' equity attributable to parent, ending balance	$ 11,670		11,670
Foreign currency translation [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	(398)	$ (746)	(400)	$ (538)
Other comprehensive income/(loss) before reclassifications	22	48	(20)	(160)
Amounts reclassified from accumulated other comprehensive income/(loss) (net of income tax)	0	0	44	0
Net current-period other comprehensive income/(loss)	22	48	24	(160)
Stockholders' equity attributable to parent, ending balance	(376)	(698)	(376)	(698)
Derivative instruments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	15	(5)	9	13
Other comprehensive income/(loss) before reclassifications	1	(3)	8	(22)
Amounts reclassified from accumulated other comprehensive income/(loss) (net of income tax)	(3)	2	(4)	3
Net current-period other comprehensive income/(loss)	(2)	(1)	4	(19)
Stockholders' equity attributable to parent, ending balance	13	(6)	13	(6)
Defined pension and post-retirement benefit costs [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	(1,928)	(1,695)	(1,968)	(1,702)
Other comprehensive income/(loss) before reclassifications	(1)	6	0	2
Amounts reclassified from accumulated other comprehensive income/(loss) (net of income tax)	14	3	53	14
Net current-period other comprehensive income/(loss)	13	9	53	16
Stockholders' equity attributable to parent, ending balance	(1,915)	(1,686)	(1,915)	(1,686)
Total [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	(2,311)	(2,446)	(2,359)	(2,227)
Other comprehensive income/(loss) before reclassifications	22	51	(12)	(180)
Amounts reclassified from accumulated other comprehensive income/(loss) (net of income tax)	11	5	93	17
Net current-period other comprehensive income/(loss)	33	56	81	(163)
Stockholders' equity attributable to parent, ending balance	$ (2,278)	$ (2,390)	$ (2,278)	$ (2,390)

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification from AOCI, Current Period, Tax	$ (1)	$ (7)	$ (7)	$ (7)
Miller [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassifications of foreign currency translation			44
Reclassifications of defined pension and post-retirement benefits costs			$ 31

Earnings Per Share - Narrative (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restricted share units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Antidilutive securities excluded from computation of earnings per share	0.2	0.0	0.2	0.0
Stock Options [Member]
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	0.1	0.2	0.1	0.2
Performance-Based Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding	0.3	0.3	0.3	0.3
Restricted share units outstanding	0.6	0.5	0.6	0.5

Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income attributable to Willis Towers Watson	$ 184	$ 94	$ 917	$ 399
Basic average number of shares outstanding (shares)	130	129	130	130
Dilutive effect of potentially issuable shares (shares)	0	1	0	0
Diluted average number of shares outstanding (shares)	130	130	130	130
Basic earnings per share	$ 1.42	$ 0.73	$ 7.06	$ 3.08
Dilutive effect of potentially issuable shares (USD per share)	(0.01)	(0.01)	(0.02)	(0.01)
Diluted earnings per share	$ 1.41	$ 0.72	$ 7.04	$ 3.07

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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

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