Willis Towers Watson Public Limited (WTW) 10-Q 27 Jul 23 2023 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2023	Jul. 24, 2023
Cover [Abstract]
Amendment Flag	false
Document Type	10-Q
Document Period End Date	Jun. 30, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Entity Registrant Name	WILLIS TOWERS WATSON PLC
Entity Central Index Key	0001140536
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		104,822,898
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Trading Symbol	WTW
Title of 12(b) Security	Ordinary Shares, nominal value $0.000304635 per share
Security Exchange Name	NASDAQ
Entity File Number	001-16503
Entity Incorporation, State or Country Code	L2
Entity Tax Identification Number	98-0352587
Entity Address, Address Line One	c/o Willis Group Limited
Entity Address, Address Line Two	51 Lime Street
Entity Address, City or Town	London
Entity Address, Country	GB
Entity Address, Postal Zip Code	EC3M 7DQ
City Area Code	011
Local Phone Number	44-20-3124-6000
Document Quarterly Report	true
Document Transition Report	false

Condensed Consolidated Statemen

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Revenue	$ 2,159	$ 2,031	$ 4,403	$ 4,191
Costs of providing services
Salaries and benefits	1,347	1,259	2,660	2,577
Other operating expenses	433	393	886	879
Depreciation	64	65	124	131
Amortization	70	83	141	168
Restructuring costs	10	56	13	62
Transaction and transformation	93	38	152	58
Total costs of providing services	2,017	1,894	3,976	3,875
Income from operations	142	137	427	316
Interest expense	(57)	(51)	(111)	(100)
Other income, net	35	93	60	120
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	120	179	376	336
Provision for income taxes	(24)	(19)	(74)	(62)
INCOME FROM CONTINUING OPERATIONS	96	160	302	274
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX	0	(46)	0	(35)
NET INCOME	96	114	302	239
Income attributable to non-controlling interests	(2)	(5)	(5)	(8)
NET INCOME ATTRIBUTABLE TO WTW	$ 94	$ 109	$ 297	$ 231
Basic earnings per share:
Income from continuing operations per share	$ 0.88	$ 1.38	$ 2.78	$ 2.31
Loss from discontinued operations per share	0	(0.41)	0	(0.3)
Basic earnings per share	0.88	0.97	2.78	2.01
Diluted earnings per share:
Income from continuing operations per share	0.88	1.38	2.77	2.31
Loss from discontinued operations per share	0	(0.41)	0	(0.3)
Diluted earnings per share	$ 0.88	$ 0.97	$ 2.77	$ 2.01
Comprehensive income/(loss) before non-controlling interests	$ 124	$ (130)	$ 383	$ (61)
Comprehensive income attributable to non-controlling interests	(2)	(5)	(5)	(8)
Comprehensive income/(loss) attributable to WTW	$ 122	$ (135)	$ 378	$ (69)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
ASSETS
Cash and cash equivalents	$ 1,602	$ 1,262
Fiduciary assets	8,608	11,772
Accounts receivable, net	2,206	2,387
Prepaid and other current assets	401	414
Total current assets	12,817	15,835
Fixed assets, net	725	718
Goodwill	10,202	10,173
Other intangible assets, net	2,146	2,273
Right-of-use assets	570	586
Pension benefits assets	893	827
Other non-current assets	1,420	1,357
Total non-current assets	15,956	15,934
TOTAL ASSETS	28,773	31,769
LIABILITIES AND EQUITY
Fiduciary liabilities	8,608	11,772
Deferred revenue and accrued expenses	1,685	1,915
Current debt	899	250
Current lease liabilities	125	126
Other current liabilities	652	716
Total current liabilities	11,969	14,779
Long-term debt	4,565	4,471
Liability for pension benefits	452	480
Deferred tax liabilities	721	748
Provision for liabilities	386	357
Long-term lease liabilities	602	620
Other non-current liabilities	201	221
Total non-current liabilities	6,927	6,897
TOTAL LIABILITIES	18,896	21,676
COMMITMENTS AND CONTINGENCIES
EQUITY
Additional paid-in capital	10,910	10,876
Retained earnings	1,429	1,764
Accumulated other comprehensive loss, net of tax	(2,540)	(2,621)
Treasury shares, at cost, 17,519 shares in 2022	0	(3)
Total WTW shareholders' equity	9,799	10,016
Non-controlling interests	78	77
Total equity	9,877	10,093
TOTAL LIABILITIES AND EQUITY	$ 28,773	$ 31,769

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2023	Dec. 31, 2022
Preference shares, nominal value (USD per share)	$ 0.000115	$ 0.000115
Preference shares, shares authorized	1,000,000,000	1,000,000,000
Preference shares, shares issued	0	0
Ordinary shares, $0.000304635 nominal value [Member]
Ordinary shares, nominal value	$ 0.000304635	$ 0.000304635
Ordinary shares, shares authorized	1,510,003,775	1,510,003,775
Ordinary shares, shares issued	104,943,324	106,756,364
Ordinary shares, shares outstanding	104,943,324	106,756,364
Treasury shares		17,519

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME		$ 302	$ 239
Adjustments to reconcile net income to total net cash from operating activities:
Depreciation		124	131
Amortization		141	168
Impairment		0	81
Non-cash restructuring charges		8	49
Non-cash lease expense		58	64
Net periodic benefit of defined benefit pension plans		(11)	(80)
Provision for doubtful receivables from clients		5	12
Benefit from deferred income taxes		(37)	(45)
Share-based compensation		58	47
Net (gain)/loss on disposal of operations		(3)	96
Non-cash foreign exchange loss/(gain)		6	(1)
Other, net		16	(12)
Changes in operating assets and liabilities, net of effects from purchase of subsidiaries:
Accounts receivable		164	180
Other assets		(81)	(111)
Other liabilities		(346)	(573)
Provisions		26	13
Net cash from operating activities		430	258
CASH FLOWS (USED IN)/FROM INVESTING ACTIVITIES
Additions to fixed assets and software for internal use		(80)	(60)
Capitalized software costs		(41)	(33)
Acquisitions of operations, net of cash acquired		(4)	(76)
Proceeds from sale of operations		9	0
Cash and fiduciary funds transferred in sale of operations		(916)	(12)
(Purchase)/sale of investments		(3)	200
Net cash (used in)/from investing activities		(1,035)	19
CASH FLOWS USED IN FINANCING ACTIVITIES
Senior notes issued		748	750
Debt issuance costs		(6)	(5)
Repayments of debt		(2)	(583)
Repurchase of shares		(454)	(2,721)
Proceeds from issuance of shares		0	1
Net (payments)/proceeds from fiduciary funds held for clients		(194)	85
Payments of deferred and contingent consideration related to acquisitions		(7)	(20)
Cash paid for employee taxes on withholding shares		(17)	(5)
Dividends paid		(177)	(189)
Acquisitions of and dividends paid to non-controlling interests		(4)	(3)
Net cash used in financing activities		(113)	(2,690)
DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	[1]	(718)	(2,413)
Effect of exchange rate changes on cash, cash equivalents and restricted cash		1	(170)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	[1]	4,721	7,691
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	[1]	$ 4,004	$ 5,108
[1] The amounts of cash, cash equivalents and restricted cash, their respective classification on the condensed consolidated balance sheets as well as their respective portions of the increase or decrease in cash, cash equivalents and restricted cash for each of the periods presented have been included in Note 19 — Supplemental Disclosures of Cash Flow Information.

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Millions	Total	Shares outstanding [Member]	Ordinary shares and APIC [Member]	Retained earnings [Member]	Treasury Stock, Common [Member]	AOCL [Member]		Total WTW shareholders' equity [Member]	Non-controlling interests [Member]
Equity, beginning balance at Dec. 31, 2021	$ 13,308		$ 10,804	$ 4,645	$ (3)	$ (2,186)	[1]	$ 13,260	$ 48
Equity, beginning balance (in shares) at Dec. 31, 2021		122,056,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	125			122				122	3
Shares repurchased (in shares)		(9,860,000)
Shares repurchased	(2,250)			(2,250)				(2,250)
Dividends declared	(94)			(94)				(94)
Dividends attributable to non-controlling interests	(1)								(1)
Other comprehensive income (loss)	(56)					(56)	[1]	(56)
Issuance of shares under employee stock compensation plans	1		1					1
Issuance of shares under employee stock compensation plans (in shares)		17,000
Share-based compensation and net settlements	20		20					20
Additional non-controlling interests	21								21
Foreign currency translation	1		1					1
Equity, ending balance at Mar. 31, 2022	11,075		10,826	2,423	(3)	(2,242)	[1]	11,004	71
Equity, ending balance (in shares) at Mar. 31, 2022		112,213,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	114			109				109	5
Shares repurchased (in shares)		(2,144,000)
Shares repurchased	(471)			(471)				(471)
Dividends declared	(90)			(90)				(90)
Dividends attributable to non-controlling interests	(2)								(2)
Other comprehensive income (loss)	(244)					(244)	[1]	(244)
Issuance of shares under employee stock compensation plans (in shares)		27,000
Share-based compensation and net settlements	22		22					22
Additional non-controlling interests	6								6
Foreign currency translation	7		7					7
Equity, ending balance at Jun. 30, 2022	10,417		10,855	1,971	(3)	(2,486)	[1]	10,337	80
Equity, ending balance (in shares) at Jun. 30, 2022		110,096,000
Equity, beginning balance at Dec. 31, 2022	10,093		10,876	1,764	(3)	(2,621)	[2]	10,016	77
Equity, beginning balance (in shares) at Dec. 31, 2022		106,756,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	206			203				203	3
Shares repurchased (in shares)		(432,000)
Shares repurchased	(104)		(3)	(104)	$ (3)			(104)
Dividends declared	(89)			(89)				(89)
Other comprehensive income (loss)	53					53	[2]	53
Issuance of shares under employee stock compensation plans (in shares)		59,000
Share-based compensation and net settlements	18		18					18
Foreign currency translation	(1)		(1)					(1)
Equity, ending balance at Mar. 31, 2023	10,176		10,890	1,774		(2,568)	[2]	10,096	80
Equity, ending balance (in shares) at Mar. 31, 2023		106,383,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	96			94				94	2
Shares repurchased (in shares)		(1,537,000)
Shares repurchased	(350)			(350)				(350)
Dividends declared	(89)			(89)				(89)
Dividends attributable to non-controlling interests	(4)								(4)
Other comprehensive income (loss)	28					28	[2]	28
Issuance of shares under employee stock compensation plans (in shares)		97,000
Share-based compensation and net settlements	20		20					20
Equity, ending balance at Jun. 30, 2023	$ 9,877		$ 10,910	$ 1,429		$ (2,540)	[2]	$ 9,799	$ 78
Equity, ending balance (in shares) at Jun. 30, 2023		104,943,000
[1] Accumulated other comprehensive loss, net of tax (‘AOCL’). Accumulated other comprehensive loss, net of tax (‘AOCL’)

Condensed Consolidated Statem_4

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

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ 94	$ 109	$ 297	$ 231

Insider Trading Arrangements

Insider Trading Arrangements	6 Months Ended
	Jun. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Nature of Operations

Nature of Operations	6 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	Note 1 — Nature of Operations Willis Towers Watson Public Limited Company is a leading global advisory, broking and solutions company that provides data-driven, insight-led solutions in the areas of people, risk and capital. The Company has more than 46,000 colleagues serving more than 140 countries and markets. We design and deliver solutions that manage risk, optimize benefits, cultivate talent and expand the power of capital to protect and strengthen institutions and individuals. Our risk management services include strategic risk consulting (including providing actuarial analysis), a variety of due diligence services, the provision of practical on-site risk control services (such as health and safety and property loss control consulting), and analytical and advisory services (such as hazard modeling). We also assist our clients with planning for addressing incidents or crises when they occur. These services include contingency planning, security audits and product tampering plans. We help our clients enhance business performance by delivering consulting services, technology and solutions that optimize benefits and cultivate talent. Our services and solutions encompass such areas as employee benefits, work and rewards, employee experience and benefits outsourcing. In addition, we provide investment advice to help our clients develop disciplined and efficient strategies to meet their investment goals and expand the power of capital. As an insurance broker, we act as an intermediary between our clients and insurance carriers by advising on their risk management requirements, helping them to determine the best means of managing risk and negotiating and placing insurance with insurance carriers through our global distribution network. We operate a private Medicare marketplace in the U.S. through which, along with our active employee marketplace, we help our clients move to a more sustainable economic model by capping and controlling the costs associated with healthcare benefits. We also provide direct-to-consumer sales of Medicare coverage. We are not an insurance company, and therefore we do not underwrite insurable risks for our own account. We help sharpen strategies, enhance organizational resilience, motivate workforces and maximize performance to uncover opportunities for sustainable success.

Basis of Presentation and Recen

Basis of Presentation and Recent Accounting Pronouncements	6 Months Ended
	Jun. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation and Recent Accounting Pronouncements	Note 2 — Basis of Presentation and Recent Accounting Pronouncements Basis of Presentation The accompanying unaudited quarterly condensed consolidated financial statements of WTW and our subsidiaries are presented in accordance with the rules and regulations of the SEC for quarterly reports on Form 10-Q and therefore certain footnote disclosures have been condensed or omitted from these financial statements as they are not required for interim reporting under U.S. GAAP. In the opinion of management, these condensed consolidated financial statements reflect all adjustments, consisting of normal recurring adjustments, which are necessary for a fair presentation of the condensed consolidated financial statements and results for the interim periods. All intercompany accounts and transactions have been eliminated in consolidation. The condensed consolidated financial statements should be read together with the Company’s Annual Report on Form 10-K, filed with the SEC on February 24, 2023, and may be accessed via EDGAR on the SEC’s web site at www.sec.gov. The results of operations for the three and six months ended June 30, 2023 are not necessarily indicative of the results that can be expected for the entire year. The Company experiences seasonal fluctuations of its revenue. Revenue is typically higher during the Company’s first and fourth quarters due primarily to the timing of broking-related activities. The results reflect certain estimates and assumptions made by management, including those estimates used in calculating acquisition consideration and fair value of tangible and intangible assets and acquisition-related liabilities, professional liability claims, estimated bonuses, valuation of billed and unbilled receivables, and anticipated tax liabilities that affect the amounts reported in the condensed consolidated financial statements and related notes. Recent Accounting Pronouncements There were no new pronouncements that are expected to have a significant impact to the Company or its condensed consolidated financial statements. Other Legislation Inflation Reduction Act The Inflation Reduction Act (the ‘IRA’) was enacted into law on August 16, 2022 and certain portions of the IRA became effective January 1, 2023. The IRA introduced, among other provisions, a share repurchase excise tax and a new Corporate Alternative Minimum Tax (‘CAMT’) which imposes a 15% tax on the adjusted financial statement income of ‘applicable corporations’. The Company does not expect the excise tax or CAMT to have a significant impact on its condensed consolidated financial statements. Pillar Two On December 12, 2022, E.U. member states reached an agreement to implement Pillar Two, which introduces a global corporate minimum tax of 15% for certain large multinational companies beginning in 2023. For the rules to take effect, E.U. member states are required to enact domestic legislation by the end of 2023 to be effective January 1, 2024. The Company is currently evaluating the impact Pillar Two will have on its condensed consolidated financial statements.

Acquisitions and Divestitures

Acquisitions and Divestitures	6 Months Ended
	Jun. 30, 2023
Dispositions [Abstract]
Acquisitions and Divestitures	Note 3 — Acquisitions and Divestitures Divestitures Divestment of Russian Business During the first quarter of 2022, WTW announced its intention to transfer ownership of its Russian subsidiaries to local management who will operate independently in the Russian market. Due to the sanctions and prohibitions on certain types of business and activities, WTW deconsolidated its Russian entities on March 14, 2022. The transfer of its Russian subsidiaries to local management was completed on the agreed-upon terms on July 18, 2022, and the transfer was registered in Russia on July 25, 2022. The deconsolidation in the first quarter of 2022 resulted in a loss of $ 57 million, which includes an allocation of Risk & Broking goodwill, and was recognized as a loss on disposal of a business within Other income, net on our condensed consolidated statements of comprehensive income. Further, certain Russian insurance contracts were placed historically by our U.K. brokers into the London market, the majority of which were under multi-year terms resulting in both current and non-current accounts receivables. Total net assets impaired, including accounts receivable balances related to our Russian business that are held outside of our Russian entities, were $ 81 million recorded during the three months ended March 31, 2022 in Other operating expenses on our condensed consolidated statements of comprehensive income. Willis Re Divestiture On August 13, 2021, the Company entered into a definitive security and asset purchase agreement (the ‘Willis Re SAPA’) to sell its treaty-reinsurance business (‘Willis Re’) to Arthur J. Gallagher & Co. (‘Gallagher’), a leading global provider of insurance, risk management and consulting services, for total upfront cash consideration of $ 3.25 billion plus an earnout payable in 2025 of up to $ 750 million in cash, subject to certain adjustments. The deal was subject to required regulatory approvals and clearances, as well as other customary closing conditions, and was completed on December 1, 2021 (‘Principal Closing’). Although the majority of the Willis Re businesses transferred to Gallagher at Principal Closing, the assets and liabilities of certain Willis Re businesses were not transferred to Gallagher at the time due to local territory restrictions (‘Deferred Closing’). The Deferred Closing for all but one business was completed during the second quarter of 2022, and all net earnings of the Deferred Closing businesses accumulated between the Principal Closing and Deferred Closing remained payable to Gallagher at June 30, 2022 and September 30, 2022. The Company recognized a preliminary pre-tax gain of $ 2.3 billion upon completion of the sale in 2021, and during the second quarter of 2022, WTW recognized a $ 60 million reduction to the pre-tax gain related to an updated estimate of the working capital transferred upon disposal. The Company recognized the final allocation of the proceeds and related tax expense, as well as an adjustment of certain indemnities for the three months ended September 30, 2022. These amounts as well as the amounts payable with respect to the settled Deferred Closing businesses were remitted to Gallagher in October 2022. The remaining Deferred Closing business transferred during the fourth quarter of 2022, and all businesses have now been transferred to Gallagher. The gain is subject to tax in certain jurisdictions, mainly in the U.S., and is predominantly tax-exempt in the U.K. In connection with the transaction, the Company reclassified the results of its Willis Re operations as discontinued operations on its condensed consolidated statements of comprehensive income and reclassified Willis Re assets and liabilities as held for sale on its condensed consolidated balance sheets. The condensed consolidated cash flow statements were not adjusted for the divestiture. Willis Re was previously included in the Company's former Investment, Risk and Reinsurance segment. As noted above, the results of the Deferred Closing businesses following the Principal Closing until their respective Deferred Closing dates have been included in income from discontinued operations on the condensed consolidated statements of comprehensive income during 2022. The Company will account for the earnout as a gain contingency and therefore did not record any receivables upon close. Rather, the earnout will be recognized in the Company’s condensed consolidated financial statements, if it is received, in 2025. A number of services are continuing under a cost reimbursement Transition Services Agreement (‘TSA’) in which WTW is providing Gallagher support including real estate leases, information technology, payroll, human resources and accounting. These services are expected to be provided for a period not to exceed two years from the Principal Closing. Fees earned under the TSA were $ 9 million and $ 18 million during the three and six months ended June 30, 2023, respectively, and $ 11 million and $ 23 million during the three and six months ended June 30, 2022, respectively, and have been recognized as a reduction to the costs incurred to service the TSA and are included in continuing operations within Other operating expenses on the condensed consolidated statements of comprehensive income. Costs incurred to service the TSA are expected to be reduced as part of the Company’s Transformation program (see Note 6 — Restructuring Costs for a description of the program) as quickly as possible when the services are no longer required by Gallagher. The following selected financial information relates to the operations of Willis Re for the periods presented: Three Months Ended Six Months Ended Revenue from discontinued operations $ 12 $ 40 Costs of providing services Salaries and benefits 2 8 Other operating expenses 1 1 Total costs of providing services 3 9 Other income, net — — Income from discontinued operations before income taxes 9 31 Adjustment to gain on disposal of Willis Re ( 61 ) ( 63 ) Benefit from income taxes 5 2 Net income receivable/(payable) to Gallagher on Deferred Closing 1 ( 5 ) Loss from discontinued operations, net of tax $ ( 46 ) $ ( 35 ) The expense amounts reflected above represent only the direct costs attributable to the Willis Re business and exclude allocations of corporate costs that will be retained following the sale. Neither the discontinued operations presented above, nor the unallocated corporate costs, reflect the impact of any cost reimbursement that will be received under the TSA. Certain amounts included in the condensed consolidated balance sheets did not transfer to Gallagher under the terms of the Willis Re SAPA, and instead were to be settled by the Company, noting that certain fiduciary positions continued to be held under the terms of various co-broking agreements between subsidiaries of the Company and Gallagher. At December 31, 2022, the amounts of significant assets and liabilities related to the Willis Re businesses which were not transferred in the sale were $ 3.2 billion of fiduciary assets and liabilities, $ 29 million of accounts receivable and $ 73 million of other current liabilities. On May 31, 2023, the Company and Gallagher entered into a side letter to the Willis Re SAPA which became effective on June 1, 2023 and which (A) ended the co-broking agreements prospectively and which (B) transferred related fiduciary and certain non-fiduciary assets and liabilities to Gallagher at that time based on then-current estimates. These non-fiduciary amounts will be finalized in the third quarter of 2023. The value of the initial transfer amounted to $ 74 million of other current liabilities less $ 26 million of accounts receivables due to the Company, totaling $ 48 million of net cash transferred to Gallagher. Additionally, total fiduciary assets and liabilities of $ 4.5 billion, including $ 868 million of fiduciary cash, was transferred to Gallagher. The total cash outflow of $ 916 million is included in cash used in investing activities in the condensed consolidated statement of cash flows.

Revenue

Revenue	6 Months Ended
	Jun. 30, 2023
Revenue from Contract with Customer [Abstract]
Revenue	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, 2023 and 2022. Along with reimbursable expenses and other, total revenue by service offering represents our revenue from customer contracts. Three Months Ended June 30, HWC R&B Corporate (i) Total 2023 2022 2023 2022 2023 2022 2023 2022 Broking $ 259 $ 236 $ 724 $ 661 $ 3 $ 3 $ 986 $ 900 Consulting 643 617 87 91 4 3 734 711 Outsourced administration 245 224 17 16 — — 262 240 Other 59 62 55 48 — — 114 110 Total revenue by service offering 1,206 1,139 883 816 7 6 2,096 1,961 Reimbursable expenses and other (i) 18 14 3 2 1 ( 3 ) 22 13 Total revenue from customer contracts $ 1,224 $ 1,153 $ 886 $ 818 $ 8 $ 3 $ 2,118 $ 1,974 Interest and other income 9 20 17 36 15 1 41 57 Total revenue $ 1,233 $ 1,173 $ 903 $ 854 $ 23 $ 4 $ 2,159 $ 2,031 Six Months Ended June 30, HWC R&B Corporate (i) Total 2023 2022 2023 2022 2023 2022 2023 2022 Broking $ 548 $ 507 $ 1,415 $ 1,357 $ 8 $ 7 $ 1,971 $ 1,871 Consulting 1,304 1,270 185 195 8 5 1,497 1,470 Outsourced administration 507 474 46 43 — — 553 517 Other 128 126 122 109 — — 250 235 Total revenue by service offering 2,487 2,377 1,768 1,704 16 12 4,271 4,093 Reimbursable expenses and other (i) 33 27 6 5 11 ( 1 ) 50 31 Total revenue from customer contracts $ 2,520 $ 2,404 $ 1,774 $ 1,709 $ 27 $ 11 $ 4,321 $ 4,124 Interest and other income 15 26 36 39 31 2 82 67 Total revenue $ 2,535 $ 2,430 $ 1,810 $ 1,748 $ 58 $ 13 $ 4,403 $ 4,191 (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. Interest and other income is included in segment revenue and total revenue, however it has been presented separately in the above tables because it does not arise directly from contracts with customers. The significant components of interest and other income are as follows for the periods presented above: Three Months Ended June 30, HWC R&B Corporate Total 2023 2022 2023 2022 2023 2022 2023 2022 Book-of-business settlements $ — $ 15 $ 3 $ 30 $ — $ — $ 3 $ 45 Interest income 6 1 15 6 14 — 35 7 Other income 3 4 ( 1 ) — 1 1 3 5 Total interest and other income $ 9 $ 20 $ 17 $ 36 $ 15 $ 1 $ 41 $ 57 Six Months Ended June 30, HWC R&B Corporate Total 2023 2022 2023 2022 2023 2022 2023 2022 Book-of-business settlements $ — $ 18 $ 10 $ 30 $ — $ — $ 10 $ 48 Interest income 11 2 27 9 29 — 67 11 Other income 4 6 ( 1 ) — 2 2 5 8 Total interest and other income $ 15 $ 26 $ 36 $ 39 $ 31 $ 2 $ 82 $ 67 As a result of the cessation of the co-broking agreement, (see Note 3 — Acquisitions and Divestitures) interest income associated with fiduciary funds will be allocated more directly to the Risk and Broking segment beginning in the third quarter of 2023. These amounts were previously allocated to the Corporate segment following the disposal of Willis Re. The following tables present revenue from service offerings by the geography where our work was performed for the three and six months ended June 30, 2023 and 2022. Reconciliations to total revenue on our condensed consolidated statements of comprehensive income and to segment revenue are shown in the tables above. Three Months Ended June 30, HWC R&B Corporate Total 2023 2022 2023 2022 2023 2022 2023 2022 North America $ 792 $ 756 $ 355 $ 333 $ 2 $ 2 $ 1,149 $ 1,091 Europe 315 293 389 351 4 3 708 647 International 99 90 139 132 1 1 239 223 Total revenue by geography $ 1,206 $ 1,139 $ 883 $ 816 $ 7 $ 6 $ 2,096 $ 1,961 Six Months Ended June 30, HWC R&B Corporate Total 2023 2022 2023 2022 2023 2022 2023 2022 North America $ 1,615 $ 1,535 $ 646 $ 610 $ 3 $ 4 $ 2,264 $ 2,149 Europe 661 646 860 831 11 7 1,532 1,484 International 211 196 262 263 2 1 475 460 Total revenue by geography $ 2,487 $ 2,377 $ 1,768 $ 1,704 $ 16 $ 12 $ 4,271 $ 4,093 Contract Balances The Company reports accounts receivable, net on the condensed consolidated balance sheets, which includes billed and unbilled receivables and current contract assets. In addition to accounts receivable, net, the Company had the following non-current contract assets and deferred revenue balances at June 30, 2023 and December 31, 2022: June 30, 2023 December 31, 2022 Billed receivables, net of allowance for doubtful accounts of $ 37 million and $ 46 million $ 1,408 $ 1,464 Unbilled receivables 497 457 Current contract assets 301 466 Accounts receivable, net $ 2,206 $ 2,387 Non-current accounts receivable, net $ 8 $ 9 Non-current contract assets $ 792 $ 745 Deferred revenue $ 694 $ 646 During the three and six months ended June 30, 2023, revenue of $ 58 million and $ 385 million, respectively, was recognized that was reflected as deferred revenue at December 31, 2022. During the three months ended June 30, 2023, revenue of $ 262 million was recognized that was reflected as deferred revenue at March 31, 2023. During the three and six months ended June 30, 2023, the Company recognized revenue of $ 3 million and $ 7 million, respectively, related to performance obligations satisfied prior to 2023. Performance Obligations The Company has contracts for which performance obligations have not been satisfied as of June 30, 2023 or have been partially satisfied as of this date. The following table shows the expected timing for the satisfaction of the remaining performance obligations. This table does not include contract renewals or variable consideration, which was excluded from the transaction prices in accordance with the guidance on constraining estimates of variable consideration. In addition, in accordance with ASC 606, Revenue From Contracts With Customers (‘ASC 606’), the Company has elected not to disclose the remaining performance obligations when one or both of the following circumstances apply: • Performance obligations which are part of a contract that has an original expected duration of less than one year , and • Performance obligations satisfied in accordance with ASC 606-10-55-18 (‘right to invoice’). Remainder of 2023 2024 2025 onward Total Revenue expected to be recognized on contracts as of June 30, 2023 $ 398 $ 414 $ 560 $ 1,372 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, 2023 have been excluded from the table above.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2023
Segment Reporting [Abstract]
Segment Information	Note 5 — Segment Information WTW has two reportable operating segments or business areas: • Health, Wealth & Career (‘HWC’); and • Risk & Broking (‘R&B’). WTW’s chief operating decision maker is its chief executive officer. We determined that the operational data used by the chief operating decision maker is at the segment level. Management bases strategic goals and decisions on these segments and the data presented below is used to assess the adequacy of strategic decisions and the methods of achieving these strategies and related financial results. Management evaluates the performance of its segments and allocates resources to them based on net operating income on a pre-tax basis. The Company experiences seasonal fluctuations of its revenue. Revenue is typically higher during the Company’s first and fourth quarters due primarily to the timing of broking-related activities. The following table presents segment revenue and segment operating income for our reportable segments for the three months ended June 30, 2023 and 2022. Three Months Ended June 30, HWC R&B Total 2023 2022 2023 2022 2023 2022 Segment revenue $ 1,215 $ 1,159 $ 900 $ 852 $ 2,115 $ 2,011 Segment operating income $ 222 $ 217 $ 145 $ 168 $ 367 $ 385 The following table presents segment revenue and segment operating income for our reportable segments for the six months ended June 30, 2023 and 2022. Six Months Ended June 30, HWC R&B Total 2023 2022 2023 2022 2023 2022 Segment revenue $ 2,502 $ 2,403 $ 1,804 $ 1,743 $ 4,306 $ 4,146 Segment operating income $ 531 $ 474 $ 325 $ 360 $ 856 $ 834 The following table presents reconciliations of the information reported by segment to the Company’s condensed consolidated statements of comprehensive income amounts reported for the three and six months ended June 30, 2023 and 2022. Three Months Ended Six Months Ended 2023 2022 2023 2022 Revenue: Total segment revenue $ 2,115 $ 2,011 $ 4,306 $ 4,146 Reimbursable expenses and other 44 20 97 45 Revenue $ 2,159 $ 2,031 $ 4,403 $ 4,191 Total segment operating income $ 367 $ 385 $ 856 $ 834 Impairment (i) — — — ( 81 ) Amortization ( 70 ) ( 83 ) ( 141 ) ( 168 ) Restructuring costs (ii) ( 10 ) ( 56 ) ( 13 ) ( 62 ) Transaction and transformation (iii) ( 93 ) ( 38 ) ( 152 ) ( 58 ) Unallocated, net (iv) ( 52 ) ( 71 ) ( 123 ) ( 149 ) Income from operations 142 137 427 316 Interest expense ( 57 ) ( 51 ) ( 111 ) ( 100 ) Other income, net 35 93 60 120 Income from continuing operations before income taxes $ 120 $ 179 $ 376 $ 336 (i) Represents the impairment related to the net assets of our Russian business that are held outside of our Russian entities (see Note 3 — Acquisitions and Divestitures for further information). (ii) See Note 6 — Restructuring Costs for the composition of costs for 2023 and 2022. (iii) In 2023 and 2022, in addition to legal fees and other transaction costs, includes primarily consulting fees and compensation costs related to the Transformation program (see Note 6 — Restructuring Costs). (iv) Includes certain costs, primarily related to corporate functions which are not directly related to the segments, and certain differences between budgeted expenses determined at the beginning of the year and actual expenses that we report for U.S. GAAP purposes. The Company does not currently provide asset information by reportable segment as it does not routinely evaluate the total asset position by segment.

Restructuring Costs

Restructuring Costs	6 Months Ended
	Jun. 30, 2023
Restructuring and Related Activities [Abstract]
Restructuring Costs	Note 6 — Restructuring Costs In the fourth quarter of 2021, the Company initiated a three-year ‘Transformation program’ designed to enhance operations, optimize technology and align its real estate footprint to its new ways of working . During the second quarter of 2023, we revised the expected costs and savings under the program and we now expect the program to generate annual cost savings in excess of $ 380 million by the end of 2024. The program is expected to incur cumulative costs of approximately $ 630 million and capital expenditures of approximately $ 270 million, for a total investment of $ 900 million. The main categories of charges will be in the following four areas: • Real estate rationalization — includes costs to align the real estate footprint to the new ways of working (hybrid work) and includes breakage fees and the impairment of right-of-use (‘ROU’) assets and other related leasehold assets. • Technology modernization — these charges are incurred in moving to common platforms and technologies, including migrating certain platforms and applications to the cloud. This category will include the impairment of technology assets that are duplicative or no longer revenue-producing, as well as costs for technology investments that do not qualify for capitalization. • Process optimization — these costs will be incurred in the right-shoring strategy and automation of our operations, which will include optimizing resource deployment and appropriate colleague alignment. These costs will include process and organizational design costs, severance and separation-related costs and temporary retention costs. • Other — other costs not included above including fees for professional services, other contract terminations not related to the above categories and supplier migration costs. Certain costs under the Transformation program are accounted for under ASC 420, Exit or Disposal Cost Obligation, and are included as restructuring costs in the condensed consolidated statements of comprehensive income. Other costs incurred under the Transformation program are included in transaction and transformation and were $ 82 million and $ 127 million during the three and six months ended June 30, 2023, respectively, and $ 26 million and $ 31 million during the three and six months ended June 30, 2022, respectively. An analysis of total restructuring costs incurred under the Transformation program by category and by segment and corporate functions, from commencement to June 30, 2023, is as follows: HWC R&B Corporate Total 2021 Real estate rationalization $ — $ — $ 19 $ 19 Technology modernization — 5 — 5 Process optimization — — — — Other — — 2 2 2022 Real estate rationalization — — 79 79 Technology modernization — 3 16 19 Process optimization 1 — — 1 Other — — — — 2023 Real estate rationalization — — 12 12 Technology modernization — — 1 1 Process optimization — — — — Other — — — — Total Real estate rationalization — — 110 110 Technology modernization — 8 17 25 Process optimization 1 — — 1 Other — — 2 2 Total $ 1 $ 8 $ 129 $ 138 A rollforward of the liability associated with cash-based charges related to restructuring costs associated with the Transformation program is as follows: Real estate rationalization Technology modernization Process optimization Other Total Balance at October 1, 2021 $ — $ — $ — $ — $ — Charges incurred — — — 2 2 Cash payments — — — ( 1 ) ( 1 ) Balance at December 31, 2021 — — — 1 1 Charges incurred 27 — 1 — 28 Cash payments ( 21 ) — ( 1 ) ( 1 ) ( 23 ) Balance at December 31, 2022 6 — — — 6 Charges incurred 5 — — — 5 Cash payments ( 9 ) — — — ( 9 ) Balance at June 30, 2023 $ 2 $ — $ — $ — $ 2

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Note 7 — Income Taxes Provision for income taxes for the three and six months ended June 30, 2023 was $ 24 million and $ 74 million, respectively, compared to $ 19 million and $ 62 million for the three and six months ended June 30, 2022, respectively. The effective tax rates were 19.8 % and 19.6 % for the three and six months ended June 30, 2023, respectively, and 10.5 % and 18.4 % for the three and six months ended June 30, 2022, respectively. These effective tax rates are calculated using extended values from our condensed consolidated statements of comprehensive income and are therefore more precise tax rates than can be calculated from rounded values. The prior-year quarter effective tax rate was lower due to certain discrete tax benefits primarily related to return-to-provision true ups. The Company recognizes deferred tax balances related to the undistributed earnings of subsidiaries when it expects that it will recover those undistributed earnings in a taxable manner, such as through receipt of dividends or sale of the investments. Historically, the Company has not provided taxes on cumulative earnings of its subsidiaries that have been reinvested indefinitely. As a result of its plans to restructure or distribute accumulated earnings of certain foreign operations, the Company has recorded an estimate of non-U.S. withholding and state income taxes. However, the Company asserts that the historical cumulative earnings of its other subsidiaries are reinvested indefinitely and therefore does not provide deferred tax liabilities on these amounts. The Company records valuation allowances against net deferred tax assets based on whether it is more likely than not that the deferred tax assets will be realized. We have liabilities for uncertain tax positions under ASC 740, Income Taxes of $ 39 million, excluding interest and penalties. The Company believes the outcomes that are reasonably possible within the next 12 months may result in a reduction in the liability for uncertain tax positions of approximately $ 1 million to $ 2 million, excluding interest and penalties.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Note 8 — Goodwill and Other Intangible Assets The components of goodwill are outlined below for the six months ended June 30, 2023. HWC R&B Total Balance at December 31, 2022: Goodwill, gross $ 7,870 $ 2,795 $ 10,665 Accumulated impairment losses ( 130 ) ( 362 ) ( 492 ) Goodwill, net - December 31, 2022 7,740 2,433 10,173 Foreign exchange 13 16 29 Balance at June 30, 2023: Goodwill, gross 7,883 2,811 10,694 Accumulated impairment losses ( 130 ) ( 362 ) ( 492 ) Goodwill, net - June 30, 2023 $ 7,753 $ 2,449 $ 10,202 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, 2023: Client relationships Software Trademark and trade name Other Total Balance at December 31, 2022: Intangible assets, gross $ 3,760 $ 725 $ 1,038 $ 98 $ 5,621 Accumulated amortization ( 2,282 ) ( 712 ) ( 298 ) ( 56 ) ( 3,348 ) Intangible assets, net - December 31, 2022 1,478 13 740 42 2,273 Intangible assets acquired 4 — — — 4 Amortization ( 107 ) ( 9 ) ( 21 ) ( 4 ) ( 141 ) Foreign exchange 10 — — — 10 Balance at June 30, 2023: Intangible assets, gross 3,798 727 1,039 99 5,663 Accumulated amortization ( 2,413 ) ( 723 ) ( 320 ) ( 61 ) ( 3,517 ) Intangible assets, net - June 30, 2023 $ 1,385 $ 4 $ 719 $ 38 $ 2,146 The weighted-average remaining life of amortizable intangible assets at June 30, 2023 was 12 .0 years. The table below reflects the future estimated amortization expense for amortizable intangible assets for the remainder of 2023 and for subsequent years: Amortization Remainder of 2023 $ 124 2024 233 2025 210 2026 203 2027 199 Thereafter 1,177 Total $ 2,146

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Note 9 — Derivative Financial Instruments We are exposed to certain foreign currency risks. Where possible, we identify exposures in our business that can be offset internally. Where no natural offset is identified, we may choose to enter into various derivative transactions. These instruments have the effect of reducing our exposure to unfavorable changes in foreign currency rates. The Company’s board of directors reviews and approves policies for managing this risk as summarized below. Additional information regarding our derivative financial instruments can be found in Note 11 — Fair Value Measurements and Note 17 — Accumulated Other Comprehensive Loss. Foreign Currency Risk Certain non-U.S. subsidiaries receive revenue and incur expenses in currencies other than their functional currency, and as a result, the foreign subsidiary’s functional currency revenue and/or expenses will fluctuate as the currency rates change. Additionally, the forecast Pounds sterling expenses of our London brokerage market operations may exceed their Pounds sterling revenue, and the entity with such operations may also hold significant foreign currency asset or liability positions in the condensed consolidated balance sheets. To reduce such variability, we use foreign exchange contracts to hedge against this currency risk. These derivatives were designated as hedging instruments and at June 30, 2023 and December 31, 2022 had total notional amounts of $ 107 million and $ 134 million, respectively, and had a net fair value asset of $ 2 million and a net fair value liability of $ 3 million, respectively. At June 30, 2023 , the Company estimates, based on current exchange rates, there will be less than $ 1 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, 2023 , our longest outstanding maturity was 1.7 years. The effects of the material derivative instruments that are designated as hedging instruments on the condensed consolidated statements of comprehensive income for the three and six months ended June 30, 2023 and 2022 are below. Amounts pertaining to the ineffective portion of hedging instruments and those excluded from effectiveness testing were immaterial for the three and six months ended June 30, 2023 and 2022. Gain/(loss) recognized in OCI (effective element) Three months ended June 30, Six months ended June 30, 2023 2022 2023 2022 Forward exchange contracts $ 2 $ ( 5 ) $ 3 $ ( 6 ) 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, 2023 2022 2023 2022 Revenue $ — $ 1 $ — $ 1 Salaries and benefits — ( 1 ) ( 1 ) 1 $ — $ — $ ( 1 ) $ 2 The Company engages in intercompany borrowing and lending between subsidiaries, primarily through its in-house banking operations which give rise to foreign exchange exposures. The Company mitigates these risks through the use of short-term foreign currency forward and swap transactions that offset the underlying exposure created when the borrower and lender have different functional currencies. These derivatives are not generally designated as hedging instruments, and at June 30, 2023 and December 31, 2022, we had notional amounts of $ 1.6 billion and $ 1.7 billion, respectively. At June 30, 2023 and December 31, 2022, we had a net fair value liability of $ 2 million and a net fair value asset of $ 24 million, respectively. Such derivatives typically mature within three months. The effects of derivatives that have not been designated as hedging instruments on the condensed consolidated statements of comprehensive income for the three and six months ended June 30, 2023 and 2022 are as follows (see Note 16 — Other Income, Net for the net foreign currency impact on the Company’s condensed consolidated statements of comprehensive income which includes the results of the offset of underlying exposures): Gain(loss) recognized in income Three Months Ended Six Months Ended Derivatives not designated as hedging instruments: Location of gain/(loss) 2023 2022 2023 2022 Forward exchange contracts Other income, net $ 8 $ ( 20 ) $ 16 $ ( 26 )

Debt

Debt	6 Months Ended
	Jun. 30, 2023
Debt Disclosure [Abstract]
Debt	Note 10 — Debt Current debt consists of the following: June 30, December 31, 4.625 % senior notes due 2023 $ 250 $ 250 3.600 % senior notes due 2024 649 — $ 899 $ 250 Long-term debt consists of the following: June 30, December 31, Revolving $ 1.5 billion credit facility $ — $ — 3.600 % senior notes due 2024 — 649 4.400 % senior notes due 2026 547 547 4.650 % senior notes due 2027 744 744 4.500 % senior notes due 2028 597 597 2.950 % senior notes due 2029 726 726 5.350 % senior notes due 2033 742 — 6.125 % senior notes due 2043 272 271 5.050 % senior notes due 2048 395 395 3.875 % senior notes due 2049 542 542 $ 4,565 $ 4,471 Senior Notes On May 17 , 2023, the Company, together with its wholly-owned subsidiary, Willis North America Inc. as issuer, completed an offering of $ 750 million aggregate principal amount of 5.350 % senior notes due 2033 (‘2033 senior notes’). The effective interest rate of the 2033 senior notes is 5.47 %, which includes the impact of the discount upon issuance. The 2033 senior notes will mature on May 15, 2033 . Interest on the 2033 senior notes accrues from May 17, 2023 and will be paid in cash on May 15 and November 15 of each year, commencing on November 15, 2023. The net proceeds from this offering, after deducting the underwriting discount and estimated offering expenses, were approximately $ 742 million and will be used to fully repay the $ 250 million aggregate principal amount of the 4.625 % senior notes, which will mature during the third quarter of 2023, and related accrued interest, and for general corporate purposes. Revolving Credit Facility On June 29, 2023, Trinity Acquisition plc amended its revolving credit facility to replace the use of London Interbank Offered Rate (‘LIBOR’) with the Secured Overnight Financing Rate (‘SOFR’) in connection with its base-rate borrowings. This amendment was done in connection with the cessation of LIBOR and all other terms remain the same. At June 30, 2023 and December 31, 2022, we were in compliance with all financial covenants.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 11 — Fair Value Measurements The Company has categorized its assets and liabilities that are measured at fair value on a recurring and non-recurring basis into a three-level fair value hierarchy, based on the reliability of the inputs used to determine fair value as follows: • Level 1: refers to fair values determined based on quoted market prices in active markets for identical assets; • Level 2: refers to fair values estimated using observable market-based inputs or unobservable inputs that are corroborated by market data; and • Level 3: includes fair values estimated using unobservable inputs that are not corroborated by market data. The following methods and assumptions were used by the Company in estimating its fair value disclosure for financial instruments: • Mutual funds and exchange-traded funds are classified as Level 1 because we use quoted market prices in active markets in determining the fair value of these securities. • Commingled funds are not leveled within the fair value hierarchy as the funds are valued at the net value of shares held as reported by the manager of the funds. These funds are not exchange-traded. • Hedge funds are not leveled within the fair value hierarchy as the fair values for these investments are estimated based on the net asset values derived from the latest audited financial statements or most recent capital account statements provided by the funds’ investment manager or third-party administrator, as a practical expedient. • Market values for our derivative instruments have been used to determine the fair values of forward foreign exchange contracts based on estimated amounts the Company would receive or have to pay to terminate the agreements, taking into account observable information about the current foreign currency forward rates. Such financial instruments are classified as Level 2. • Contingent consideration payable is classified as Level 3, and we estimate fair value based on the likelihood and timing of achieving the relevant milestones of each arrangement, applying a probability assessment to each of the potential outcomes, which at times includes the use of a Monte Carlo simulation and discounting the probability-weighted payout. Typically, milestones are based on revenue or earnings growth for the acquired business. The following tables present our assets and liabilities measured at fair value on a recurring basis at June 30, 2023 and December 31, 2022: Fair Value Measurements on a Recurring Basis at Balance Sheet Location Level 1 Level 2 Level 3 Total Assets: Available-for-sale securities: Mutual funds / exchange-traded funds (i) Prepaid and other current assets and other non-current assets $ 100 $ — $ — $ 100 Fiduciary assets 182 — — 182 Commingled funds (i) (ii) Other non-current assets — — — 8 Hedge funds (i) (iii) Other non-current assets — — — 5 Derivatives: Derivative financial instruments (iv) Prepaid and other current assets and other non-current assets $ — $ 3 $ — $ 3 Liabilities: Contingent consideration: Contingent consideration (v) (vi) Other current liabilities and other non-current liabilities $ — $ — $ 43 $ 43 Derivatives: Derivative financial instruments (iv) Other current liabilities and other non-current liabilities $ — $ 3 $ — $ 3 Fair Value Measurements on a Recurring Basis at Balance Sheet Location Level 1 Level 2 Level 3 Total Assets: Available-for-sale securities: Mutual funds / exchange-traded funds Prepaid and other current assets and other non-current assets $ 7 $ — $ — $ 7 Fiduciary assets 142 — — 142 Derivatives: Derivative financial instruments (iv) Prepaid and other current assets and other non-current assets $ — $ 26 $ — $ 26 Liabilities: Contingent consideration: Contingent consideration (v) (vi) Other current liabilities and other non-current liabilities $ — $ — $ 40 $ 40 Derivatives: Derivative financial instruments (iv) Other current liabilities and other non-current liabilities $ — $ 5 $ — $ 5 (i) With the exception of the funds included in fiduciary assets, the majority of these balances are held as part of deferred compensation plans with related liabilities in other current liabilities and other non-current liabilities on the condensed consolidated balance sheets. (ii) Consists of the Towers Watson Global Equity Focus Fund, for which redemptions can occur on any business day, and require a minimum of one business day’s notice. (iii) Consists of the Towers Watson Alternative Credit Fund, for which the redemption period is generally quarterly, however requires a 50-day notice. (iv) See Note 9 — Derivative Financial Instruments for further information on our derivative investments . (v) Probability weightings are based on our knowledge of the past and planned performance of the acquired entity to which the contingent consideration applies. The fair value weighted-average discount rates used in our material contingent consideration calculations were 10.03 % and 10.26 % at June 30, 2023 and December 31, 2022, respectively. The range of these discount rates was 3.53 % - 13.80 % at June 30, 2023. Using different probability weightings and discount rates could result in an increase or decrease of the contingent consideration payable. (vi) Consideration due to be paid across multiple years until 2027. The following table summarizes the change in fair value of the Level 3 liabilities: Fair Value Measurements Using Significant Unobservable Inputs (Level 3) June 30, 2023 Balance at December 31, 2022 $ 40 Obligations assumed — Payments ( 2 ) Realized and unrealized losses (i) 5 Foreign exchange — Balance at June 30, 2023 $ 43 (i) Realized and unrealized losses include accretion and adjustments to contingent consideration liabilities, which are included within Interest expense and Other operating expenses, respectively, on the condensed consolidated statements of comprehensive income. There were no significant transfers to or from Level 3 in the six months ended June 30, 2023. Fair value information about financial instruments not measured at fair value The following tables present our liabilities not measured at fair value on a recurring basis at June 30, 2023 and December 31, 2022: June 30, 2023 December 31, 2022 Carrying Value Fair Value Carrying Value Fair Value Assets: Long-term note receivable $ 71 $ 61 $ 68 $ 63 Liabilities: Current debt $ 899 $ 884 $ 250 $ 248 Long-term debt $ 4,565 $ 4,202 $ 4,471 $ 4,069 The carrying value of our revolving credit facility approximates its fair value. The fair values above, which exclude accrued interest, are not necessarily indicative of the amounts that the Company would realize upon disposition, nor do they indicate the Company’s intent or ability to dispose of the financial instruments. The fair values of our respective senior notes and long-term note receivable are considered Level 2 financial instruments as they are corroborated by observable market data.

Retirement Benefits

Retirement Benefits	6 Months Ended
	Jun. 30, 2023
Retirement Benefits [Abstract]
Retirement Benefits	Note 12 — Retirement Benefits Defined Benefit Plans WTW sponsors both qualified and non-qualified defined benefit pension plans throughout the world. The majority of our plan assets and obligations are in the U.S. and the U.K. We have also included disclosures related to defined benefit plans in certain other countries, including Canada, France, Germany, Switzerland and Ireland. Together, these disclosed funded and unfunded plans represent 98 % of WTW’s pension obligations and are disclosed herein. We have removed prior-period disclosures pertaining to our post-retirement welfare plans as the Company considers such disclosure to no longer be material. Components of Net Periodic Benefit (Income)/Cost for Defined Benefit Pension Plans The following tables set forth the components of net periodic benefit (income)/cost for the Company’s defined benefit pension plans for the three and six months ended June 30, 2023 and 2022: Three Months Ended June 30, 2023 2022 U.S. U.K. Other U.S. U.K. Other Service cost $ 14 $ 2 $ 4 $ 19 $ 4 $ 5 Interest cost 49 30 7 30 17 4 Expected return on plan assets ( 76 ) ( 41 ) ( 10 ) ( 82 ) ( 37 ) ( 9 ) Settlements 1 — ( 1 ) — — — Amortization of net loss 3 12 — 3 7 1 Amortization of prior service credit — ( 3 ) 1 — ( 3 ) — Net periodic benefit (income)/cost $ ( 9 ) $ — $ 1 $ ( 30 ) $ ( 12 ) $ 1 Six Months Ended June 30, 2023 2022 U.S. U.K. Other U.S. U.K. Other Service cost $ 28 $ 3 $ 7 $ 38 $ 7 $ 11 Interest cost 98 59 14 59 36 8 Expected return on plan assets ( 152 ) ( 80 ) ( 19 ) ( 165 ) ( 76 ) ( 19 ) Settlements 1 — ( 1 ) — — — Amortization of net loss 6 24 — 7 15 2 Amortization of prior service credit — ( 6 ) 1 — ( 6 ) — Net periodic benefit (income)/cost $ ( 19 ) $ — $ 2 $ ( 61 ) $ ( 24 ) $ 2 Employer Contributions to Defined Benefit Pension Plans The Company did no t make any contributions to its U.S. plans during the six months ended June 30, 2023 and currently does no t anticipate making contributions over the remainder of the fiscal year . The Company made contributions of $ 10 million to its U.K. plans for the six months ended June 30, 2023 and anticipates making additional contributions of $ 8 million for the remainder of the fiscal year. The Company made contributions of $ 18 million to its other plans for the six months ended June 30, 2023 and anticipates making additional contributions of $ 5 million for the remainder of the fiscal year. Defined Contribution Plans The Company made contributions to its defined contribution plans of $ 41 million and $ 81 million during the three and six months ended June 30, 2023, respectively, and $ 38 million and $ 80 million during the three and six months ended June 30, 2022, respectively.

Leases

Leases	6 Months Ended
	Jun. 30, 2023
Leases [Abstract]
Leases	Note 13 — Leases The following tables present lease costs recorded on our condensed consolidated statements of comprehensive income for the three and six months ended June 30, 2023 and 2022: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Finance lease cost: Amortization of right-of-use assets $ 1 $ 1 $ 1 $ 1 Interest on lease liabilities — — 1 1 Operating lease cost 37 56 71 95 Variable lease cost 16 16 28 34 Sublease income ( 3 ) ( 5 ) ( 6 ) ( 9 ) Total lease cost, net $ 51 $ 68 $ 95 $ 122 The total lease cost is recognized in different locations in our condensed consolidated statements of comprehensive income. Amortization of the finance lease ROU assets is included in depreciation, while the interest cost component of these finance leases is included in interest expense. All other costs are included in other operating expenses, with the exception of $ 4 million and $ 5 million incurred during the three and six months ended June 30, 2023, respectively, and $ 26 million and $ 31 million incurred during the three and six months ended June 30, 2022, respectively, that were included in restructuring costs (see Note 6 — Restructuring Costs) that primarily related to the acceleration of amortization of certain abandoned ROU assets and the payment of early termination fees. There are no significant lease costs that have been included as discontinued operations in the condensed consolidated statements of comprehensive income during the three and six months ended June 30, 2022.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 14 — Commitments and Contingencies Indemnification Agreements WTW has various agreements which provide that it may be obligated to indemnify the other party to the agreement with respect to certain matters. Generally, these indemnification provisions are included in contracts arising in the normal course of business and in connection with the purchase and sale of certain businesses, including the disposal of Willis Re. It is not possible to predict the maximum potential amount of future payments that may become due under these indemnification agreements because of the conditional nature of the Company’s obligations and the unique facts of each particular agreement. However, we do not believe that any potential liability that may arise from such indemnity provisions is probable or material. Legal Proceedings In the ordinary course of business, the Company is subject to various actual and potential claims, lawsuits and other proceedings. Some of the claims, lawsuits and other proceedings seek damages in amounts which could, if assessed, be significant. The Company also receives subpoenas in the ordinary course of business and, from time to time, receives requests for information in connection with governmental investigations. Errors and omissions claims, lawsuits, and other proceedings arising in the ordinary course of business are covered in part by professional indemnity or other appropriate insurance. The terms of this insurance vary by policy year. Regarding self-insured risks, the Company has established provisions which are believed to be adequate in light of current information and legal advice, or, in certain cases, where a range of loss exists, the Company accrues the minimum amount in the range if no amount within the range is a better estimate than any other amount. The Company adjusts such provisions from time to time according to developments. See Note 15 — Supplementary Information for Certain Balance Sheet Accounts for the amounts accrued at June 30, 2023 and December 31, 2022 in the condensed consolidated balance sheets. On the basis of current information, the Company does not expect that the actual claims, lawsuits and other proceedings to which it is subject, or potential claims, lawsuits, and other proceedings relating to matters of which it is aware, will ultimately have a material adverse effect on its financial condition, results of operations or liquidity. Nonetheless, given the large or indeterminate amounts sought in certain of these actions, and the inherent unpredictability of litigation and disputes with insurance companies, it is possible that an adverse outcome or settlement in certain matters could, from time to time, have a material adverse effect on the Company’s results of operations or cash flows in a particular quarterly or annual period. The Company provides for contingent liabilities based on ASC 450, Contingencies, when it is determined that a liability, inclusive of defense costs, is probable and reasonably estimable. The contingent liabilities recorded are primarily developed actuarially. Litigation is subject to many factors which are difficult to predict so there can be no assurance that in the event of a material unfavorable result in one or more claims, we will not incur material costs.

Supplementary Information for C

Supplementary Information for Certain Balance Sheet Accounts	6 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Supplementary Information for Certain Balance Sheet Accounts	Note 15 — 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, December 31, Accounts payable, accrued liabilities and deferred revenue $ 1,016 $ 975 Accrued discretionary and incentive compensation 397 708 Accrued vacation 199 142 Other employee-related liabilities 73 90 Total deferred revenue and accrued expenses $ 1,685 $ 1,915 Provision for liabilities consists of the following: June 30, December 31, Claims, lawsuits and other proceedings $ 319 $ 296 Other provisions 67 61 Total provision for liabilities $ 386 $ 357

Other Income, Net

Other Income, Net	6 Months Ended
	Jun. 30, 2023
Other Income and Expenses [Abstract]
Other Income, Net	Note 16 — Other Income, Net Other income, net consists of the following: Three Months Ended Six Months Ended 2023 2022 2023 2022 Gain/(loss) on disposal of operations (i) $ 3 $ 22 $ 3 $ ( 32 ) Net periodic pension and postretirement benefit credits 25 69 53 140 Interest in earnings of associates and other investments 1 2 2 4 Foreign exchange gain/(loss) (ii) 1 ( 1 ) ( 4 ) 5 Other 5 1 6 3 Other income, net $ 35 $ 93 $ 60 $ 120 (i) For both the three and six months ended June 30, 2022, includes a $ 24 million non-cash revaluation gain related to an acquisition completed in stages. (ii) Includes the offsetting effects of the Company's foreign currency hedging program. See Note 9 — Derivative Financial Instruments.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	6 Months Ended
	Jun. 30, 2023
Equity [Abstract]
Accumulated Other Comprehensive Loss	Note 17 — Accumulated Other Comprehensive Loss Changes in accumulated other comprehensive loss, net of non-controlling interests, and net of tax are provided in the following tables for the three and six months ended June 30, 2023 and 2022. This table excludes amounts attributable to non-controlling interests, which are not material for further disclosure. Foreign currency (i) Derivative (i) Defined pension and (ii) Total 2023 2022 2023 2022 2023 2022 2023 2022 Quarter-to-date activity: Balance at March 31, 2023 and 2022, respectively $ ( 944 ) $ ( 548 ) $ 11 $ 8 $ ( 1,635 ) $ ( 1,702 ) $ ( 2,568 ) $ ( 2,242 ) Other comprehensive income/(loss) before 18 ( 246 ) 1 ( 2 ) 1 ( 4 ) 20 ( 252 ) Loss reclassified from accumulated other 3 and $ 1 , respectively) — — — — 8 8 8 8 Net current-period other comprehensive income/(loss) 18 ( 246 ) 1 ( 2 ) 9 4 28 ( 244 ) Balance at June 30, 2023 and 2022, respectively $ ( 926 ) $ ( 794 ) $ 12 $ 6 $ ( 1,626 ) $ ( 1,698 ) $ ( 2,540 ) $ ( 2,486 ) Year-to-date activity: Balance at December 31, 2022 and 2021, respectively $ ( 987 ) $ ( 489 ) $ 9 $ 11 $ ( 1,643 ) $ ( 1,708 ) $ ( 2,621 ) $ ( 2,186 ) Other comprehensive income/(loss) before 61 ( 305 ) 3 ( 3 ) — ( 2 ) 64 ( 310 ) (Gain)/loss reclassified from accumulated other 6 and $ 4 , respectively) — — — ( 2 ) 17 12 17 10 Net current-period other comprehensive income/(loss) 61 ( 305 ) 3 ( 5 ) 17 10 81 ( 300 ) Balance at June 30, 2023 and 2022, respectively $ ( 926 ) $ ( 794 ) $ 12 $ 6 $ ( 1,626 ) $ ( 1,698 ) $ ( 2,540 ) $ ( 2,486 ) (i) Reclassification adjustments from accumulated other comprehensive loss related to derivative instruments are included in Revenue and Salaries and benefits in the accompanying condensed consolidated statements of comprehensive income. See Note 9 — Derivative Financial Instruments for additional details regarding the reclassification adjustments for the derivative settlements. (ii) Reclassification adjustments from accumulated other comprehensive loss are included in the computation of net periodic pension cost (see Note 12 — Retirement Benefits). These components are included in Other income, net in the accompanying condensed consolidated statements of comprehensive income.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2023
Earnings Per Share [Abstract]
Earnings Per Share	Note 18 — Earnings Per Share Basic and diluted earnings per share from continuing operations attributable to WTW and discontinued operations, net of tax are calculated by dividing net income from continuing operations attributable to WTW and discontinued operations, net of tax, respectively, by the average number of ordinary shares outstanding during each period. The computation of diluted earnings per share reflects the potential dilution that could occur if dilutive securities and other contracts to issue shares were exercised or converted into shares or resulted in the issuance of shares that then shared in the net income of the Company. At June 30, 2023 and 2022, there were 0.6 million and 0.7 million restricted performance-based stock units outstanding, respectively, and 0.5 million and 0.4 million restricted time-based stock units outstanding, respectively. The Company’s time-based share options were immaterial at both June 30, 2023 and 2022. There were no performance-based options outstanding at June 30, 2023 ; there were 0.1 million performance-based options outstanding at June 30, 2022. Basic and diluted earnings per share are as follows: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Income from continuing operations $ 96 $ 160 $ 302 $ 274 Less: income attributable to non-controllable interests ( 2 ) ( 5 ) ( 5 ) ( 8 ) Income from continuing operations attributable to WTW $ 94 $ 155 $ 297 $ 266 Loss from discontinued operations, net of tax $ — $ ( 46 ) $ — $ ( 35 ) Basic average number of shares outstanding 107 112 107 115 Dilutive effect of potentially issuable shares — — — — Diluted average number of shares outstanding 107 112 107 115 Basic earnings per share from continuing operations attributable to WTW $ 0.88 $ 1.38 $ 2.78 $ 2.31 Dilutive effect of potentially issuable shares — — ( 0.01 ) — Diluted earnings per share from continuing operations attributable to WTW $ 0.88 $ 1.38 $ 2.77 $ 2.31 Basic loss per share from discontinued operations, net of tax $ — $ ( 0.41 ) $ — $ ( 0.30 ) Dilutive effect of potentially issuable shares — — — — Diluted loss per share from discontinued operations, net of tax $ — $ ( 0.41 ) $ — $ ( 0.30 ) Anti-dilutive restricted stock units were immaterial for the three and six months ended June 30, 2023; for the three and six months ended June 30, 2022, 0.3 million and 0.2 million restricted stock units, respectively, were not included in the computation of the dilutive effect of potentially issuable shares because their effect was anti-dilutive. There were no anti-dilutive options for the three and six months ended June 30, 2023 and 2022.

Supplemental Disclosures of Cas

Supplemental Disclosures of Cash Flow Information	6 Months Ended
	Jun. 30, 2023
Supplemental Cash Flow Elements [Abstract]
Supplemental Disclosures of Cash Flow Information	Note 19 — Supplemental Disclosures of Cash Flow Information Supplemental disclosures regarding cash flow information are as follows: Six months ended June 30, 2023 2022 Supplemental disclosures of cash flow information: Cash and cash equivalents $ 1,602 $ 1,920 Fiduciary funds (included in fiduciary assets) 2,402 3,183 Cash and cash equivalents and fiduciary funds (included in current assets held — 5 Total cash, cash equivalents and restricted cash $ 4,004 $ 5,108 Increase/(decrease) in cash, cash equivalents and other restricted cash $ 345 $ ( 2,515 ) (Decrease)/increase in fiduciary funds ( 1,063 ) 102 Total $ ( 718 ) $ ( 2,413 )

Basis of Presentation and Rec_2

Basis of Presentation and Recent Accounting Pronouncements (Policies)	6 Months Ended
	Jun. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited quarterly condensed consolidated financial statements of WTW and our subsidiaries are presented in accordance with the rules and regulations of the SEC for quarterly reports on Form 10-Q and therefore certain footnote disclosures have been condensed or omitted from these financial statements as they are not required for interim reporting under U.S. GAAP. In the opinion of management, these condensed consolidated financial statements reflect all adjustments, consisting of normal recurring adjustments, which are necessary for a fair presentation of the condensed consolidated financial statements and results for the interim periods. All intercompany accounts and transactions have been eliminated in consolidation. The condensed consolidated financial statements should be read together with the Company’s Annual Report on Form 10-K, filed with the SEC on February 24, 2023, and may be accessed via EDGAR on the SEC’s web site at www.sec.gov. The results of operations for the three and six months ended June 30, 2023 are not necessarily indicative of the results that can be expected for the entire year. The Company experiences seasonal fluctuations of its revenue. Revenue is typically higher during the Company’s first and fourth quarters due primarily to the timing of broking-related activities. The results reflect certain estimates and assumptions made by management, including those estimates used in calculating acquisition consideration and fair value of tangible and intangible assets and acquisition-related liabilities, professional liability claims, estimated bonuses, valuation of billed and unbilled receivables, and anticipated tax liabilities that affect the amounts reported in the condensed consolidated financial statements and related notes.
Recent Accounting Pronouncements	Recent Accounting Pronouncements There were no new pronouncements that are expected to have a significant impact to the Company or its condensed consolidated financial statements.
Other Legislation	Other Legislation Inflation Reduction Act The Inflation Reduction Act (the ‘IRA’) was enacted into law on August 16, 2022 and certain portions of the IRA became effective January 1, 2023. The IRA introduced, among other provisions, a share repurchase excise tax and a new Corporate Alternative Minimum Tax (‘CAMT’) which imposes a 15% tax on the adjusted financial statement income of ‘applicable corporations’. The Company does not expect the excise tax or CAMT to have a significant impact on its condensed consolidated financial statements. Pillar Two On December 12, 2022, E.U. member states reached an agreement to implement Pillar Two, which introduces a global corporate minimum tax of 15% for certain large multinational companies beginning in 2023. For the rules to take effect, E.U. member states are required to enact domestic legislation by the end of 2023 to be effective January 1, 2024. The Company is currently evaluating the impact Pillar Two will have on its condensed consolidated financial statements.
Fair Value of Financial Instruments	The Company has categorized its assets and liabilities that are measured at fair value on a recurring and non-recurring basis into a three-level fair value hierarchy, based on the reliability of the inputs used to determine fair value as follows: • Level 1: refers to fair values determined based on quoted market prices in active markets for identical assets; • Level 2: refers to fair values estimated using observable market-based inputs or unobservable inputs that are corroborated by market data; and • Level 3: includes fair values estimated using unobservable inputs that are not corroborated by market data. The following methods and assumptions were used by the Company in estimating its fair value disclosure for financial instruments: • Mutual funds and exchange-traded funds are classified as Level 1 because we use quoted market prices in active markets in determining the fair value of these securities. • Commingled funds are not leveled within the fair value hierarchy as the funds are valued at the net value of shares held as reported by the manager of the funds. These funds are not exchange-traded. • Hedge funds are not leveled within the fair value hierarchy as the fair values for these investments are estimated based on the net asset values derived from the latest audited financial statements or most recent capital account statements provided by the funds’ investment manager or third-party administrator, as a practical expedient. • Market values for our derivative instruments have been used to determine the fair values of forward foreign exchange contracts based on estimated amounts the Company would receive or have to pay to terminate the agreements, taking into account observable information about the current foreign currency forward rates. Such financial instruments are classified as Level 2. • Contingent consideration payable is classified as Level 3, and we estimate fair value based on the likelihood and timing of achieving the relevant milestones of each arrangement, applying a probability assessment to each of the potential outcomes, which at times includes the use of a Monte Carlo simulation and discounting the probability-weighted payout. Typically, milestones are based on revenue or earnings growth for the acquired business.

Acquisitions and Divestitures (

Acquisitions and Divestitures (Tables)	6 Months Ended
	Jun. 30, 2023
Business Combinations [Abstract]
Schedule of Selected Financial Information and Summary of Total Assets and Liabilities Relates to the Operations of Willis Re	The following selected financial information relates to the operations of Willis Re for the periods presented: Three Months Ended Six Months Ended Revenue from discontinued operations $ 12 $ 40 Costs of providing services Salaries and benefits 2 8 Other operating expenses 1 1 Total costs of providing services 3 9 Other income, net — — Income from discontinued operations before income taxes 9 31 Adjustment to gain on disposal of Willis Re ( 61 ) ( 63 ) Benefit from income taxes 5 2 Net income receivable/(payable) to Gallagher on Deferred Closing 1 ( 5 ) Loss from discontinued operations, net of tax $ ( 46 ) $ ( 35 )

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2023
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables present revenue by service offering and segment, as well as reconciliations to total revenue for the three and six months ended June 30, 2023 and 2022. Along with reimbursable expenses and other, total revenue by service offering represents our revenue from customer contracts. Three Months Ended June 30, HWC R&B Corporate (i) Total 2023 2022 2023 2022 2023 2022 2023 2022 Broking $ 259 $ 236 $ 724 $ 661 $ 3 $ 3 $ 986 $ 900 Consulting 643 617 87 91 4 3 734 711 Outsourced administration 245 224 17 16 — — 262 240 Other 59 62 55 48 — — 114 110 Total revenue by service offering 1,206 1,139 883 816 7 6 2,096 1,961 Reimbursable expenses and other (i) 18 14 3 2 1 ( 3 ) 22 13 Total revenue from customer contracts $ 1,224 $ 1,153 $ 886 $ 818 $ 8 $ 3 $ 2,118 $ 1,974 Interest and other income 9 20 17 36 15 1 41 57 Total revenue $ 1,233 $ 1,173 $ 903 $ 854 $ 23 $ 4 $ 2,159 $ 2,031 Six Months Ended June 30, HWC R&B Corporate (i) Total 2023 2022 2023 2022 2023 2022 2023 2022 Broking $ 548 $ 507 $ 1,415 $ 1,357 $ 8 $ 7 $ 1,971 $ 1,871 Consulting 1,304 1,270 185 195 8 5 1,497 1,470 Outsourced administration 507 474 46 43 — — 553 517 Other 128 126 122 109 — — 250 235 Total revenue by service offering 2,487 2,377 1,768 1,704 16 12 4,271 4,093 Reimbursable expenses and other (i) 33 27 6 5 11 ( 1 ) 50 31 Total revenue from customer contracts $ 2,520 $ 2,404 $ 1,774 $ 1,709 $ 27 $ 11 $ 4,321 $ 4,124 Interest and other income 15 26 36 39 31 2 82 67 Total revenue $ 2,535 $ 2,430 $ 1,810 $ 1,748 $ 58 $ 13 $ 4,403 $ 4,191 (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. Interest and other income is included in segment revenue and total revenue, however it has been presented separately in the above tables because it does not arise directly from contracts with customers. The significant components of interest and other income are as follows for the periods presented above: Three Months Ended June 30, HWC R&B Corporate Total 2023 2022 2023 2022 2023 2022 2023 2022 Book-of-business settlements $ — $ 15 $ 3 $ 30 $ — $ — $ 3 $ 45 Interest income 6 1 15 6 14 — 35 7 Other income 3 4 ( 1 ) — 1 1 3 5 Total interest and other income $ 9 $ 20 $ 17 $ 36 $ 15 $ 1 $ 41 $ 57 Six Months Ended June 30, HWC R&B Corporate Total 2023 2022 2023 2022 2023 2022 2023 2022 Book-of-business settlements $ — $ 18 $ 10 $ 30 $ — $ — $ 10 $ 48 Interest income 11 2 27 9 29 — 67 11 Other income 4 6 ( 1 ) — 2 2 5 8 Total interest and other income $ 15 $ 26 $ 36 $ 39 $ 31 $ 2 $ 82 $ 67 As a result of the cessation of the co-broking agreement, (see Note 3 — Acquisitions and Divestitures) interest income associated with fiduciary funds will be allocated more directly to the Risk and Broking segment beginning in the third quarter of 2023. These amounts were previously allocated to the Corporate segment following the disposal of Willis Re. The following tables present revenue from service offerings by the geography where our work was performed for the three and six months ended June 30, 2023 and 2022. Reconciliations to total revenue on our condensed consolidated statements of comprehensive income and to segment revenue are shown in the tables above. Three Months Ended June 30, HWC R&B Corporate Total 2023 2022 2023 2022 2023 2022 2023 2022 North America $ 792 $ 756 $ 355 $ 333 $ 2 $ 2 $ 1,149 $ 1,091 Europe 315 293 389 351 4 3 708 647 International 99 90 139 132 1 1 239 223 Total revenue by geography $ 1,206 $ 1,139 $ 883 $ 816 $ 7 $ 6 $ 2,096 $ 1,961 Six Months Ended June 30, HWC R&B Corporate Total 2023 2022 2023 2022 2023 2022 2023 2022 North America $ 1,615 $ 1,535 $ 646 $ 610 $ 3 $ 4 $ 2,264 $ 2,149 Europe 661 646 860 831 11 7 1,532 1,484 International 211 196 262 263 2 1 475 460 Total revenue by geography $ 2,487 $ 2,377 $ 1,768 $ 1,704 $ 16 $ 12 $ 4,271 $ 4,093
Contract with Customer, Asset and Liability	The Company reports accounts receivable, net on the condensed consolidated balance sheets, which includes billed and unbilled receivables and current contract assets. In addition to accounts receivable, net, the Company had the following non-current contract assets and deferred revenue balances at June 30, 2023 and December 31, 2022: June 30, 2023 December 31, 2022 Billed receivables, net of allowance for doubtful accounts of $ 37 million and $ 46 million $ 1,408 $ 1,464 Unbilled receivables 497 457 Current contract assets 301 466 Accounts receivable, net $ 2,206 $ 2,387 Non-current accounts receivable, net $ 8 $ 9 Non-current contract assets $ 792 $ 745 Deferred revenue $ 694 $ 646
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction	In addition, in accordance with ASC 606, Revenue From Contracts With Customers (‘ASC 606’), the Company has elected not to disclose the remaining performance obligations when one or both of the following circumstances apply: • Performance obligations which are part of a contract that has an original expected duration of less than one year , and • Performance obligations satisfied in accordance with ASC 606-10-55-18 (‘right to invoice’). Remainder of 2023 2024 2025 onward Total Revenue expected to be recognized on contracts as of June 30, 2023 $ 398 $ 414 $ 560 $ 1,372

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2023
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The following table presents segment revenue and segment operating income for our reportable segments for the three months ended June 30, 2023 and 2022. Three Months Ended June 30, HWC R&B Total 2023 2022 2023 2022 2023 2022 Segment revenue $ 1,215 $ 1,159 $ 900 $ 852 $ 2,115 $ 2,011 Segment operating income $ 222 $ 217 $ 145 $ 168 $ 367 $ 385 The following table presents segment revenue and segment operating income for our reportable segments for the six months ended June 30, 2023 and 2022. Six Months Ended June 30, HWC R&B Total 2023 2022 2023 2022 2023 2022 Segment revenue $ 2,502 $ 2,403 $ 1,804 $ 1,743 $ 4,306 $ 4,146 Segment operating income $ 531 $ 474 $ 325 $ 360 $ 856 $ 834
Net Operating Income of the Reported Segments	The following table presents reconciliations of the information reported by segment to the Company’s condensed consolidated statements of comprehensive income amounts reported for the three and six months ended June 30, 2023 and 2022. Three Months Ended Six Months Ended 2023 2022 2023 2022 Revenue: Total segment revenue $ 2,115 $ 2,011 $ 4,306 $ 4,146 Reimbursable expenses and other 44 20 97 45 Revenue $ 2,159 $ 2,031 $ 4,403 $ 4,191 Total segment operating income $ 367 $ 385 $ 856 $ 834 Impairment (i) — — — ( 81 ) Amortization ( 70 ) ( 83 ) ( 141 ) ( 168 ) Restructuring costs (ii) ( 10 ) ( 56 ) ( 13 ) ( 62 ) Transaction and transformation (iii) ( 93 ) ( 38 ) ( 152 ) ( 58 ) Unallocated, net (iv) ( 52 ) ( 71 ) ( 123 ) ( 149 ) Income from operations 142 137 427 316 Interest expense ( 57 ) ( 51 ) ( 111 ) ( 100 ) Other income, net 35 93 60 120 Income from continuing operations before income taxes $ 120 $ 179 $ 376 $ 336 (i) Represents the impairment related to the net assets of our Russian business that are held outside of our Russian entities (see Note 3 — Acquisitions and Divestitures for further information). (ii) See Note 6 — Restructuring Costs for the composition of costs for 2023 and 2022. (iii) In 2023 and 2022, in addition to legal fees and other transaction costs, includes primarily consulting fees and compensation costs related to the Transformation program (see Note 6 — Restructuring Costs). (iv) Includes certain costs, primarily related to corporate functions which are not directly related to the segments, and certain differences between budgeted expenses determined at the beginning of the year and actual expenses that we report for U.S. GAAP purposes.

Restructuring Costs (Tables)

Restructuring Costs (Tables)	6 Months Ended
	Jun. 30, 2023
Restructuring and Related Activities [Abstract]
Summary of Total Restructuring Costs	An analysis of total restructuring costs incurred under the Transformation program by category and by segment and corporate functions, from commencement to June 30, 2023, is as follows: HWC R&B Corporate Total 2021 Real estate rationalization $ — $ — $ 19 $ 19 Technology modernization — 5 — 5 Process optimization — — — — Other — — 2 2 2022 Real estate rationalization — — 79 79 Technology modernization — 3 16 19 Process optimization 1 — — 1 Other — — — — 2023 Real estate rationalization — — 12 12 Technology modernization — — 1 1 Process optimization — — — — Other — — — — Total Real estate rationalization — — 110 110 Technology modernization — 8 17 25 Process optimization 1 — — 1 Other — — 2 2 Total $ 1 $ 8 $ 129 $ 138
Rollforward of Liability Associated with Cash-based Charges	A rollforward of the liability associated with cash-based charges related to restructuring costs associated with the Transformation program is as follows: Real estate rationalization Technology modernization Process optimization Other Total Balance at October 1, 2021 $ — $ — $ — $ — $ — Charges incurred — — — 2 2 Cash payments — — — ( 1 ) ( 1 ) Balance at December 31, 2021 — — — 1 1 Charges incurred 27 — 1 — 28 Cash payments ( 21 ) — ( 1 ) ( 1 ) ( 23 ) Balance at December 31, 2022 6 — — — 6 Charges incurred 5 — — — 5 Cash payments ( 9 ) — — — ( 9 ) Balance at June 30, 2023 $ 2 $ — $ — $ — $ 2

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Components of Goodwill	The components of goodwill are outlined below for the six months ended June 30, 2023. HWC R&B Total Balance at December 31, 2022: Goodwill, gross $ 7,870 $ 2,795 $ 10,665 Accumulated impairment losses ( 130 ) ( 362 ) ( 492 ) Goodwill, net - December 31, 2022 7,740 2,433 10,173 Foreign exchange 13 16 29 Balance at June 30, 2023: Goodwill, gross 7,883 2,811 10,694 Accumulated impairment losses ( 130 ) ( 362 ) ( 492 ) Goodwill, net - June 30, 2023 $ 7,753 $ 2,449 $ 10,202
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, 2023: Client relationships Software Trademark and trade name Other Total Balance at December 31, 2022: Intangible assets, gross $ 3,760 $ 725 $ 1,038 $ 98 $ 5,621 Accumulated amortization ( 2,282 ) ( 712 ) ( 298 ) ( 56 ) ( 3,348 ) Intangible assets, net - December 31, 2022 1,478 13 740 42 2,273 Intangible assets acquired 4 — — — 4 Amortization ( 107 ) ( 9 ) ( 21 ) ( 4 ) ( 141 ) Foreign exchange 10 — — — 10 Balance at June 30, 2023: Intangible assets, gross 3,798 727 1,039 99 5,663 Accumulated amortization ( 2,413 ) ( 723 ) ( 320 ) ( 61 ) ( 3,517 ) Intangible assets, net - June 30, 2023 $ 1,385 $ 4 $ 719 $ 38 $ 2,146
Schedule of Future Estimated Amortization Expense for Amortizable Intangible Assets	The table below reflects the future estimated amortization expense for amortizable intangible assets for the remainder of 2023 and for subsequent years: Amortization Remainder of 2023 $ 124 2024 233 2025 210 2026 203 2027 199 Thereafter 1,177 Total $ 2,146

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2023
Designated [Member]
Schedule of Derivative Instruments Designated/Nondesignated As Hedging Instrument Effect on Condensed Consolidated Statements of Comprehensive Income	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, 2023 and 2022 are below. Gain/(loss) recognized in OCI (effective element) Three months ended June 30, Six months ended June 30, 2023 2022 2023 2022 Forward exchange contracts $ 2 $ ( 5 ) $ 3 $ ( 6 ) 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, 2023 2022 2023 2022 Revenue $ — $ 1 $ — $ 1 Salaries and benefits — ( 1 ) ( 1 ) 1 $ — $ — $ ( 1 ) $ 2
Nondesignated [Member]
Schedule of Derivative Instruments Designated/Nondesignated As Hedging Instrument Effect on Condensed Consolidated Statements of Comprehensive Income	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, 2023 and 2022 are as follows (see Note 16 — Other Income, Net for the net foreign currency impact on the Company’s condensed consolidated statements of comprehensive income which includes the results of the offset of underlying exposures): Gain(loss) recognized in income Three Months Ended Six Months Ended Derivatives not designated as hedging instruments: Location of gain/(loss) 2023 2022 2023 2022 Forward exchange contracts Other income, net $ 8 $ ( 20 ) $ 16 $ ( 26 )

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2023
Debt Disclosure [Abstract]
Schedule of Current and Long-term Debt	Current debt consists of the following: June 30, December 31, 4.625 % senior notes due 2023 $ 250 $ 250 3.600 % senior notes due 2024 649 — $ 899 $ 250 Long-term debt consists of the following: June 30, December 31, Revolving $ 1.5 billion credit facility $ — $ — 3.600 % senior notes due 2024 — 649 4.400 % senior notes due 2026 547 547 4.650 % senior notes due 2027 744 744 4.500 % senior notes due 2028 597 597 2.950 % senior notes due 2029 726 726 5.350 % senior notes due 2033 742 — 6.125 % senior notes due 2043 272 271 5.050 % senior notes due 2048 395 395 3.875 % senior notes due 2049 542 542 $ 4,565 $ 4,471

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2023
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis	The following tables present our assets and liabilities measured at fair value on a recurring basis at June 30, 2023 and December 31, 2022: Fair Value Measurements on a Recurring Basis at Balance Sheet Location Level 1 Level 2 Level 3 Total Assets: Available-for-sale securities: Mutual funds / exchange-traded funds (i) Prepaid and other current assets and other non-current assets $ 100 $ — $ — $ 100 Fiduciary assets 182 — — 182 Commingled funds (i) (ii) Other non-current assets — — — 8 Hedge funds (i) (iii) Other non-current assets — — — 5 Derivatives: Derivative financial instruments (iv) Prepaid and other current assets and other non-current assets $ — $ 3 $ — $ 3 Liabilities: Contingent consideration: Contingent consideration (v) (vi) Other current liabilities and other non-current liabilities $ — $ — $ 43 $ 43 Derivatives: Derivative financial instruments (iv) Other current liabilities and other non-current liabilities $ — $ 3 $ — $ 3 Fair Value Measurements on a Recurring Basis at Balance Sheet Location Level 1 Level 2 Level 3 Total Assets: Available-for-sale securities: Mutual funds / exchange-traded funds Prepaid and other current assets and other non-current assets $ 7 $ — $ — $ 7 Fiduciary assets 142 — — 142 Derivatives: Derivative financial instruments (iv) Prepaid and other current assets and other non-current assets $ — $ 26 $ — $ 26 Liabilities: Contingent consideration: Contingent consideration (v) (vi) Other current liabilities and other non-current liabilities $ — $ — $ 40 $ 40 Derivatives: Derivative financial instruments (iv) Other current liabilities and other non-current liabilities $ — $ 5 $ — $ 5 (i) With the exception of the funds included in fiduciary assets, the majority of these balances are held as part of deferred compensation plans with related liabilities in other current liabilities and other non-current liabilities on the condensed consolidated balance sheets. (ii) Consists of the Towers Watson Global Equity Focus Fund, for which redemptions can occur on any business day, and require a minimum of one business day’s notice. (iii) Consists of the Towers Watson Alternative Credit Fund, for which the redemption period is generally quarterly, however requires a 50-day notice. (iv) See Note 9 — Derivative Financial Instruments for further information on our derivative investments . (v) Probability weightings are based on our knowledge of the past and planned performance of the acquired entity to which the contingent consideration applies. The fair value weighted-average discount rates used in our material contingent consideration calculations were 10.03 % and 10.26 % at June 30, 2023 and December 31, 2022, respectively. The range of these discount rates was 3.53 % - 13.80 % at June 30, 2023. Using different probability weightings and discount rates could result in an increase or decrease of the contingent consideration payable. (vi) Consideration due to be paid across multiple years until 2027.
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, 2023 Balance at December 31, 2022 $ 40 Obligations assumed — Payments ( 2 ) Realized and unrealized losses (i) 5 Foreign exchange — Balance at June 30, 2023 $ 43 (i) Realized and unrealized losses include accretion and adjustments to contingent consideration liabilities, which are included within Interest expense and Other operating expenses, respectively, on the condensed consolidated statements of comprehensive income.
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, 2023 and December 31, 2022: June 30, 2023 December 31, 2022 Carrying Value Fair Value Carrying Value Fair Value Assets: Long-term note receivable $ 71 $ 61 $ 68 $ 63 Liabilities: Current debt $ 899 $ 884 $ 250 $ 248 Long-term debt $ 4,565 $ 4,202 $ 4,471 $ 4,069

Retirement Benefits (Tables)

Retirement Benefits (Tables)	6 Months Ended
	Jun. 30, 2023
Retirement Benefits [Abstract]
Schedule of Net Periodic Benefit Cost	The following tables set forth the components of net periodic benefit (income)/cost for the Company’s defined benefit pension plans for the three and six months ended June 30, 2023 and 2022: Three Months Ended June 30, 2023 2022 U.S. U.K. Other U.S. U.K. Other Service cost $ 14 $ 2 $ 4 $ 19 $ 4 $ 5 Interest cost 49 30 7 30 17 4 Expected return on plan assets ( 76 ) ( 41 ) ( 10 ) ( 82 ) ( 37 ) ( 9 ) Settlements 1 — ( 1 ) — — — Amortization of net loss 3 12 — 3 7 1 Amortization of prior service credit — ( 3 ) 1 — ( 3 ) — Net periodic benefit (income)/cost $ ( 9 ) $ — $ 1 $ ( 30 ) $ ( 12 ) $ 1 Six Months Ended June 30, 2023 2022 U.S. U.K. Other U.S. U.K. Other Service cost $ 28 $ 3 $ 7 $ 38 $ 7 $ 11 Interest cost 98 59 14 59 36 8 Expected return on plan assets ( 152 ) ( 80 ) ( 19 ) ( 165 ) ( 76 ) ( 19 ) Settlements 1 — ( 1 ) — — — Amortization of net loss 6 24 — 7 15 2 Amortization of prior service credit — ( 6 ) 1 — ( 6 ) — Net periodic benefit (income)/cost $ ( 19 ) $ — $ 2 $ ( 61 ) $ ( 24 ) $ 2

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2023
Leases [Abstract]
Schedule of Lease Costs Recorded in Condensed Consolidated Statements of Comprehensive Income	The following tables present lease costs recorded on our condensed consolidated statements of comprehensive income for the three and six months ended June 30, 2023 and 2022: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Finance lease cost: Amortization of right-of-use assets $ 1 $ 1 $ 1 $ 1 Interest on lease liabilities — — 1 1 Operating lease cost 37 56 71 95 Variable lease cost 16 16 28 34 Sublease income ( 3 ) ( 5 ) ( 6 ) ( 9 ) Total lease cost, net $ 51 $ 68 $ 95 $ 122

Supplementary Information for_2

Supplementary Information for Certain Balance Sheet Accounts (Tables)	6 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred Revenue and Accrued Expenses	Deferred revenue and accrued expenses consist of the following: June 30, December 31, Accounts payable, accrued liabilities and deferred revenue $ 1,016 $ 975 Accrued discretionary and incentive compensation 397 708 Accrued vacation 199 142 Other employee-related liabilities 73 90 Total deferred revenue and accrued expenses $ 1,685 $ 1,915
Provisions for Liabilities	Provision for liabilities consists of the following: June 30, December 31, Claims, lawsuits and other proceedings $ 319 $ 296 Other provisions 67 61 Total provision for liabilities $ 386 $ 357

Other Income, Net (Tables)

Other Income, Net (Tables)	6 Months Ended
	Jun. 30, 2023
Other Income and Expenses [Abstract]
Schedule of Other Nonoperating Income	Other income, net consists of the following: Three Months Ended Six Months Ended 2023 2022 2023 2022 Gain/(loss) on disposal of operations (i) $ 3 $ 22 $ 3 $ ( 32 ) Net periodic pension and postretirement benefit credits 25 69 53 140 Interest in earnings of associates and other investments 1 2 2 4 Foreign exchange gain/(loss) (ii) 1 ( 1 ) ( 4 ) 5 Other 5 1 6 3 Other income, net $ 35 $ 93 $ 60 $ 120 (i) For both the three and six months ended June 30, 2022, includes a $ 24 million non-cash revaluation gain related to an acquisition completed in stages. (ii) Includes the offsetting effects of the Company's foreign currency hedging program. See Note 9 — Derivative Financial Instruments.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
	Jun. 30, 2023
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (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, 2023 and 2022. This table excludes amounts attributable to non-controlling interests, which are not material for further disclosure. Foreign currency (i) Derivative (i) Defined pension and (ii) Total 2023 2022 2023 2022 2023 2022 2023 2022 Quarter-to-date activity: Balance at March 31, 2023 and 2022, respectively $ ( 944 ) $ ( 548 ) $ 11 $ 8 $ ( 1,635 ) $ ( 1,702 ) $ ( 2,568 ) $ ( 2,242 ) Other comprehensive income/(loss) before 18 ( 246 ) 1 ( 2 ) 1 ( 4 ) 20 ( 252 ) Loss reclassified from accumulated other 3 and $ 1 , respectively) — — — — 8 8 8 8 Net current-period other comprehensive income/(loss) 18 ( 246 ) 1 ( 2 ) 9 4 28 ( 244 ) Balance at June 30, 2023 and 2022, respectively $ ( 926 ) $ ( 794 ) $ 12 $ 6 $ ( 1,626 ) $ ( 1,698 ) $ ( 2,540 ) $ ( 2,486 ) Year-to-date activity: Balance at December 31, 2022 and 2021, respectively $ ( 987 ) $ ( 489 ) $ 9 $ 11 $ ( 1,643 ) $ ( 1,708 ) $ ( 2,621 ) $ ( 2,186 ) Other comprehensive income/(loss) before 61 ( 305 ) 3 ( 3 ) — ( 2 ) 64 ( 310 ) (Gain)/loss reclassified from accumulated other 6 and $ 4 , respectively) — — — ( 2 ) 17 12 17 10 Net current-period other comprehensive income/(loss) 61 ( 305 ) 3 ( 5 ) 17 10 81 ( 300 ) Balance at June 30, 2023 and 2022, respectively $ ( 926 ) $ ( 794 ) $ 12 $ 6 $ ( 1,626 ) $ ( 1,698 ) $ ( 2,540 ) $ ( 2,486 ) (i) Reclassification adjustments from accumulated other comprehensive loss related to derivative instruments are included in Revenue and Salaries and benefits in the accompanying condensed consolidated statements of comprehensive income. See Note 9 — Derivative Financial Instruments for additional details regarding the reclassification adjustments for the derivative settlements. (ii) Reclassification adjustments from accumulated other comprehensive loss are included in the computation of net periodic pension cost (see Note 12 — Retirement Benefits). These components are included in Other income, net in the accompanying condensed consolidated statements of comprehensive income.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2023
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, 2023 2022 2023 2022 Income from continuing operations $ 96 $ 160 $ 302 $ 274 Less: income attributable to non-controllable interests ( 2 ) ( 5 ) ( 5 ) ( 8 ) Income from continuing operations attributable to WTW $ 94 $ 155 $ 297 $ 266 Loss from discontinued operations, net of tax $ — $ ( 46 ) $ — $ ( 35 ) Basic average number of shares outstanding 107 112 107 115 Dilutive effect of potentially issuable shares — — — — Diluted average number of shares outstanding 107 112 107 115 Basic earnings per share from continuing operations attributable to WTW $ 0.88 $ 1.38 $ 2.78 $ 2.31 Dilutive effect of potentially issuable shares — — ( 0.01 ) — Diluted earnings per share from continuing operations attributable to WTW $ 0.88 $ 1.38 $ 2.77 $ 2.31 Basic loss per share from discontinued operations, net of tax $ — $ ( 0.41 ) $ — $ ( 0.30 ) Dilutive effect of potentially issuable shares — — — — Diluted loss per share from discontinued operations, net of tax $ — $ ( 0.41 ) $ — $ ( 0.30 )

Supplemental Disclosures of C_2

Supplemental Disclosures of Cash Flow Information (Tables)	6 Months Ended
	Jun. 30, 2023
Supplemental Cash Flow Elements [Abstract]
Supplemental Disclosures Regarding Cash Flow Information and Non-cash Flow Investing and Financing Activities	Supplemental disclosures regarding cash flow information are as follows: Six months ended June 30, 2023 2022 Supplemental disclosures of cash flow information: Cash and cash equivalents $ 1,602 $ 1,920 Fiduciary funds (included in fiduciary assets) 2,402 3,183 Cash and cash equivalents and fiduciary funds (included in current assets held — 5 Total cash, cash equivalents and restricted cash $ 4,004 $ 5,108 Increase/(decrease) in cash, cash equivalents and other restricted cash $ 345 $ ( 2,515 ) (Decrease)/increase in fiduciary funds ( 1,063 ) 102 Total $ ( 718 ) $ ( 2,413 )

Nature of Operations (Details)

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

Acquisitions and Divestitures -

Acquisitions and Divestitures - Divestment of Russian Business (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Discontinued Operations and Disposal Groups [Abstract]
Deconsolidation gain or loss amount	$ 57
Impairment	$ 81	$ 0	$ 81

Acquisitions and Divestitures_2

Acquisitions and Divestitures - Willis Re Divestiture (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
	Jun. 01, 2023	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Aug. 13, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Preliminary pre-tax gain on sale					$ 3	$ (96)
Cash outflow of cash and non-fiduciary cash related to settlement.					916	12
Cash outflow of cash and fiduciary cash related to settlement.					$ 916	12
Gallagher [Member] | Transition Services Agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Maximum expected service period					2 years
Fees earned under service agreement		$ 9	$ 11		$ 18	$ 23
Willis Re SAPA [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total consideration received from sale of subsidiary								$ 3,250
Preliminary pre-tax gain on sale			$ (60)	$ 2,300
Fiduciary assets excluded from held-for-sale							$ 3,200
Accounts receivable, net balances excluded from held-for-sale							29
Other current liabilities excluded from held for sale							$ 73
Willis Re SAPA [Member] | Maximum [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earnout receivable in cash in 2025								$ 750
Willis Re SAPA [Member] | Gallagher [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Value of obligation in initial transfer	$ 74
Value of receivables in initial transfer	26
Cash outflow of cash and non-fiduciary cash related to settlement.	916
Cash outflow of cash and fiduciary cash related to settlement.	916
Fiduciary assets transferred	4,500
Willis Re SAPA [Member] | Gallagher [Member] | Fiduciary Cash [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash outflow of cash and non-fiduciary cash related to settlement.	868
Cash outflow of cash and fiduciary cash related to settlement.	868
Willis Re SAPA [Member] | Gallagher [Member] | Non-Fiduciary Cash [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash outflow of cash and non-fiduciary cash related to settlement.	48
Cash outflow of cash and fiduciary cash related to settlement.	$ 48

Acquisitions and Divestitures_3

Acquisitions and Divestitures - Schedule of Selected Financial Information Relates to the Operations of Willis Re (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Adjustment to gain on disposal of Willis Re			$ 3	$ (96)
Loss from discontinued operations, net of tax	$ 0	$ (46)	$ 0	(35)
Willis Re [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue from discontinued operations		12		40
Salaries and benefits		2		8
Other operating expenses		1		1
Total costs of providing services		3		9
Other income, net		0		0
Income from discontinued operations before income taxes		9		31
Adjustment to gain on disposal of Willis Re		(61)		(63)
Provision for income taxes		5		2
Net income payable to Gallagher on Deferred Closing		1		(5)
Loss from discontinued operations, net of tax		$ (46)		$ (35)

Revenue - Schedule of Disaggreg

Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 2,118	$ 1,974	$ 4,321	$ 4,124
Reimbursable expenses and other	[1]	22	13	50	31
Interest and other income		41	57	82	67
Total revenue		2,159	2,031	4,403	4,191
HWC [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,224	1,153	2,520	2,404
Reimbursable expenses and other	[1]	18	14	33	27
Interest and other income		9	20	15	26
Total revenue		1,233	1,173	2,535	2,430
R&B [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		886	818	1,774	1,709
Reimbursable expenses and other	[1]	3	2	6	5
Interest and other income		17	36	36	39
Total revenue		903	854	1,810	1,748
Corporate, Non-Segment
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	8	3	27	11
Reimbursable expenses and other	[1]	1	(3)	11	(1)
Interest and other income	[1]	15	1	31	2
Total revenue	[1]	23	4	58	13
Broking [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		986	900	1,971	1,871
Broking [Member] | HWC [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		259	236	548	507
Broking [Member] | R&B [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		724	661	1,415	1,357
Broking [Member] | Corporate, Non-Segment
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	3	3	8	7
Consulting [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		734	711	1,497	1,470
Consulting [Member] | HWC [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		643	617	1,304	1,270
Consulting [Member] | R&B [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		87	91	185	195
Consulting [Member] | Corporate, Non-Segment
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	4	3	8	5
Outsourced administration [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		262	240	553	517
Outsourced administration [Member] | HWC [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		245	224	507	474
Outsourced administration [Member] | R&B [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		17	16	46	43
Outsourced administration [Member] | Corporate, Non-Segment
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	0	0	0	0
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		114	110	250	235
Other [Member] | HWC [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		59	62	128	126
Other [Member] | R&B [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		55	48	122	109
Other [Member] | Corporate, Non-Segment
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	0	0	0	0
Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		2,096	1,961	4,271	4,093
Service | HWC [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,206	1,139	2,487	2,377
Service | R&B [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		883	816	1,768	1,704
Service | Corporate, Non-Segment
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	$ 7	$ 6	$ 16	$ 12
[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.

Revenue - Schedule of Component

Revenue - Schedule of Components of Interest and Other Income (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Book-of-Business Settlements		$ 3	$ 45	$ 10	$ 48
Interest income		35	7	67	11
Other income		3	5	5	8
Total interest and other income		41	57	82	67
HWC [Member]
Disaggregation of Revenue [Line Items]
Book-of-Business Settlements		0	15	0	18
Interest income		6	1	11	2
Other income		3	4	4	6
Total interest and other income		9	20	15	26
R&B [Member]
Disaggregation of Revenue [Line Items]
Book-of-Business Settlements		3	30	10	30
Interest income		15	6	27	9
Other income		(1)	0	(1)	0
Total interest and other income		17	36	36	39
Corporate, Non-Segment
Disaggregation of Revenue [Line Items]
Book-of-Business Settlements		0	0	0	0
Interest income		14	0	29	0
Other income		1	1	2	2
Total interest and other income	[1]	$ 15	$ 1	$ 31	$ 2
[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.

Revenue - Narrative (Details)

Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023
Disaggregation Of Revenue [Line Items]
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 3	$ 7
March 31, 2023 [Member]
Disaggregation Of Revenue [Line Items]
Contract with Customer, Liability, Revenue Recognized	262
Dec 31, 2022 [Member]
Disaggregation Of Revenue [Line Items]
Contract with Customer, Liability, Revenue Recognized	$ 58	$ 385

Revenue - Schedule of Revenue b

Revenue - Schedule of Revenue by Geography (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 2,118	$ 1,974	$ 4,321	$ 4,124
Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		2,096	1,961	4,271	4,093
Operating Segments [Member] | Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		2,096	1,961	4,271	4,093
Corporate, Non-Segment
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	8	3	27	11
Corporate, Non-Segment | Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	7	6	16	12
HWC [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,224	1,153	2,520	2,404
HWC [Member] | Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,206	1,139	2,487	2,377
HWC [Member] | Operating Segments [Member] | Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,206	1,139	2,487	2,377
R&B [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		886	818	1,774	1,709
R&B [Member] | Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		883	816	1,768	1,704
R&B [Member] | Operating Segments [Member] | Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		883	816	1,768	1,704
North America [Member] | Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax				2,264	2,149
North America [Member] | Operating Segments [Member] | Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,149	1,091
North America [Member] | Corporate, Non-Segment
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax				3	4
North America [Member] | Corporate, Non-Segment | Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		2	2
North America [Member] | HWC [Member] | Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax				1,615	1,535
North America [Member] | HWC [Member] | Operating Segments [Member] | Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		792	756
North America [Member] | R&B [Member] | Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax				646	610
North America [Member] | R&B [Member] | Operating Segments [Member] | Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		355	333
Europe [Member] | Operating Segments [Member] | Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		708	647	1,532	1,484
Europe [Member] | Corporate, Non-Segment | Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		4	3	11	7
Europe [Member] | HWC [Member] | Operating Segments [Member] | Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		315	293	661	646
Europe [Member] | R&B [Member] | Operating Segments [Member] | Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		389	351	860	831
International [Member] | Operating Segments [Member] | Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		239	223	475	460
International [Member] | Corporate, Non-Segment | Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1	1	2	1
International [Member] | HWC [Member] | Operating Segments [Member] | Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		99	90	211	196
International [Member] | R&B [Member] | Operating Segments [Member] | Service
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 139	$ 132	$ 262	$ 263
[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.

Revenue - Schedule of Contract

Revenue - Schedule of Contract Balances (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Billed Receivable, Current	$ 1,408	$ 1,464
Unbilled Receivable, Current	497	457
Contract asset, Current	301	466
Accounts receivable, net	2,206	2,387
Non-current accounts receivable, net	8	9
Non-current contract assets	792	745
Deferred revenue	$ 694	$ 646

Revenue - Schedule of Contrac_2

Revenue - Schedule of Contract Balances (Parenthetical) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Allowance for doubtful debts	$ 37	$ 46

Revenue - Schedule of Remaining

Revenue - Schedule of Remaining Performance Obligations (Details)	Jun. 30, 2023 USD ($)
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 1,372
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-07-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 398,000,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 414,000,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 560,000,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year

Segment Information - Narrative

Segment Information - Narrative (Details)	6 Months Ended
	Jun. 30, 2023 Segment
Segment Reporting [Abstract]
Number of reportable segments	2

Segment Information - Revenue (

Segment Information - Revenue (Net of Reimbursable Expenses) of the Reported Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Segment revenue	$ 2,159	$ 2,031	$ 4,403	$ 4,191
Segment operating income	142	137	427	316
HWC [Member]
Segment Reporting Information [Line Items]
Segment revenue	1,233	1,173	2,535	2,430
R&B [Member]
Segment Reporting Information [Line Items]
Segment revenue	903	854	1,810	1,748
Operating Segments [Member]
Segment Reporting Information [Line Items]
Segment revenue	2,115	2,011	4,306	4,146
Segment operating income	367	385	856	834
Operating Segments [Member] | HWC [Member]
Segment Reporting Information [Line Items]
Segment revenue	1,215	1,159	2,502	2,403
Segment operating income	222	217	531	474
Operating Segments [Member] | R&B [Member]
Segment Reporting Information [Line Items]
Segment revenue	900	852	1,804	1,743
Segment operating income	$ 145	$ 168	$ 325	$ 360

Segment Information - Reconcili

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, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue:
Revenue		$ 2,159	$ 2,031		$ 4,403	$ 4,191
Income/(loss) from operations		142	137		427	316
Impairment				$ (81)	0	(81)
Amortization		(70)	(83)		(141)	(168)
Restructuring costs		(10)	(56)		(13)	(62)
Interest expense		(57)	(51)		(111)	(100)
Other income, net		35	93		60	120
Income from continuing operations before income taxes		120	179		376	336
Operating Segments [Member]
Revenue:
Revenue		2,115	2,011		4,306	4,146
Income/(loss) from operations		367	385		856	834
Segment Reconciling Items [Member]
Revenue:
Revenue		44	20		97	45
Income/(loss) from operations		142	137		427	316
Impairment	[1]	0	0		0	(81)
Amortization		(70)	(83)		(141)	(168)
Restructuring costs	[2]	(10)	(56)		(13)	(62)
Transaction and transformation	[3]	(93)	(38)		(152)	(58)
Unallocated, net	[4]	(52)	(71)		(123)	(149)
Interest expense		(57)	(51)		(111)	(100)
Other income, net		$ 35	$ 93		$ 60	$ 120
[1] Represents the impairment related to the net assets of our Russian business that are held outside of our Russian entities (see Note 3 — Acquisitions and Divestitures for further information). See Note 6 — Restructuring Costs for the composition of costs for 2023 and 2022. In 2023 and 2022, in addition to legal fees and other transaction costs, includes primarily consulting fees and compensation costs related to the Transformation program (see Note 6 — Restructuring Costs). Includes certain costs, primarily related to corporate functions which are not directly related to the segments, and certain differences between budgeted expenses determined at the beginning of the year and actual expenses that we report for U.S. GAAP purposes.

Restructuring Costs - Narrative

Restructuring Costs - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Restructuring Cost and Reserve [Line Items]
Transaction and transformation	$ 93	$ 38	$ 152	$ 58
Transformation Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, description			the Company initiated a three-year ‘Transformation program’ designed to enhance operations, optimize technology and align its real estate footprint to its new ways of working
Restructuring, Expected future effects	900
Transaction and transformation	82	$ 26	$ 127	$ 31
Transformation Program [Member] | Projected Annual Cost Savings by End of 2024 [Member]
Restructuring Cost and Reserve [Line Items]
Annual cost savings of program	380
Transformation Program [Member] | Cumulative Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, Expected future effects	630
Transformation Program [Member] | Capital Expenditures [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, Expected future effects	$ 270

Restructuring Costs - Summary o

Restructuring Costs - Summary of Total Restructuring Costs (Details) - Transformation Program [Member] - USD ($) $ in Millions	6 Months Ended	12 Months Ended		21 Months Ended
	Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2023
Restructuring Cost and Reserve [Line Items]
Total				$ 138
Real Estate Rationalization [Member]
Restructuring Cost and Reserve [Line Items]
Total	$ 12	$ 79	$ 19	110
Technology Modernization [Member]
Restructuring Cost and Reserve [Line Items]
Total	1	19	5	25
Process optimization [Member]
Restructuring Cost and Reserve [Line Items]
Total		1		1
Other [Member]
Restructuring Cost and Reserve [Line Items]
Total			2	2
Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Total				129
Corporate, Non-Segment | Real Estate Rationalization [Member]
Restructuring Cost and Reserve [Line Items]
Total	12	79	19	110
Corporate, Non-Segment | Technology Modernization [Member]
Restructuring Cost and Reserve [Line Items]
Total	$ 1	16		17
Corporate, Non-Segment | Other [Member]
Restructuring Cost and Reserve [Line Items]
Total			2	2
HWC [Member]
Restructuring Cost and Reserve [Line Items]
Total				1
HWC [Member] | Process optimization [Member]
Restructuring Cost and Reserve [Line Items]
Total		1		1
R&B [Member]
Restructuring Cost and Reserve [Line Items]
Total				8
R&B [Member] | Technology Modernization [Member]
Restructuring Cost and Reserve [Line Items]
Total		$ 3	$ 5	$ 8

Restructuring Costs - Rollforwa

Restructuring Costs - Rollforward of Liability Associated with Cash-based Charges (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Charges incurred	$ 10	$ 56		$ 13	$ 62
Transformation Program [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			$ 0	6	1	$ 1
Charges incurred			2	0		28
Cash payments			(1)	0		(23)
Ending Balance	2		1	2		6
Transformation Program [Member] | Real Estate Rationalization [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance				6
Charges incurred				0		27
Cash payments				0		(21)
Ending Balance	2			2		6
Transformation Program [Member] | Process optimization [Member]
Restructuring Cost and Reserve [Line Items]
Charges incurred						1
Cash payments						(1)
Transformation Program [Member] | Other [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			0		$ 1	1
Charges incurred			2
Cash payments			(1)			$ (1)
Ending Balance	$ 0		$ 1	$ 0

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating Loss Carryforwards [Line Items]
Provision for income taxes	$ (24)	$ (19)	$ (74)	$ (62)
Effective tax rate	19.80%	10.50%	19.60%	18.40%
Liabilities for uncertain tax positions	$ 39		$ 39
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Expected decrease in liability for uncertain tax position	1		1
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Expected decrease in liability for uncertain tax position	$ 2		$ 2

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Components of Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	$ 10,665
Accumulated impairment losses, beginning balance	(492)
Goodwill, net, beginning balance	10,173
Foreign exchange	29
Goodwill, gross, ending balance	10,694
Accumulated impairment losses, ending balance	(492)
Goodwill, net, ending balance	10,202
HWC [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	7,870
Accumulated impairment losses, beginning balance	(130)
Goodwill, net, beginning balance	7,740
Foreign exchange	13
Goodwill, gross, ending balance	7,883
Accumulated impairment losses, ending balance	(130)
Goodwill, net, ending balance	7,753
R&B [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	2,795
Accumulated impairment losses, beginning balance	(362)
Goodwill, net, beginning balance	2,433
Foreign exchange	16
Goodwill, gross, ending balance	2,811
Accumulated impairment losses, ending balance	(362)
Goodwill, net, ending balance	$ 2,449

Goodwill and Other Intangible_4

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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	$ 5,663		$ 5,663		$ 5,621
Finite-lived intangible assets, accumulated amortization	(3,517)		(3,517)		(3,348)
Finite-lived intangible assets, net amount	2,146		2,146		2,273
Intangible assets acquired			4
Amortization	(70)	$ (83)	(141)	$ (168)
Foreign exchange			10
Client relationships [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	3,798		3,798		3,760
Finite-lived intangible assets, accumulated amortization	(2,413)		(2,413)		(2,282)
Finite-lived intangible assets, net amount	1,385		1,385		1,478
Intangible assets acquired			4
Amortization			(107)
Foreign exchange			10
Software [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	727		727		725
Finite-lived intangible assets, accumulated amortization	(723)		(723)		(712)
Finite-lived intangible assets, net amount	4		4		13
Intangible assets acquired			0
Amortization			(9)
Foreign exchange			0
Trademark and trade name [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	1,039		1,039		1,038
Finite-lived intangible assets, accumulated amortization	(320)		(320)		(298)
Finite-lived intangible assets, net amount	719		719		740
Intangible assets acquired			0
Amortization			(21)
Foreign exchange			0
Other [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross carrying amount	99		99		98
Finite-lived intangible assets, accumulated amortization	(61)		(61)		(56)
Finite-lived intangible assets, net amount	$ 38		38		$ 42
Intangible assets acquired			0
Amortization			(4)
Foreign exchange			$ 0

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Narrative (Details)	Jun. 30, 2023
Finite-lived Intangible Assets [Roll Forward]
Weighted average remaining life of amortizable intangible assets	12 years

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets - Schedule of Future Estimated Amortization Expense for Amortizable Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Remainder of 2023	$ 124
2024	233
2025	210
2026	203
2027	199
Thereafter	1,177
Total	$ 2,146	$ 2,273

Derivative Financial Instrume_3

Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Gains/losses on derivatives to be reclassified within the next twelve months	$ 1
Maximum [Member]
Derivative [Line Items]
Longest outstanding maturity	1 year 8 months 12 days
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Derivative, notional amount	$ 1,600	$ 1,700
Derivative liability, fair value	2
Derivative assets, fair value		24
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Derivative, notional amount	$ 107	$ 134
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Other Liabilities, Noncurrent
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent
Derivative liability, fair value		$ 3
Derivative assets, fair value	$ 2

Derivative Financial Instrume_4

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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative [Line Items]
Gain/(loss) recognized in OCI (effective element)	$ 2	$ (5)	$ 3	$ (6)
Gain/(Loss) reclassified from Accumulated OCL into income (effective element)	$ 0	$ 0	$ (1)	$ 2
Revenue [Member]
Derivative [Line Items]
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	Revenues	Revenues	Revenues	Revenues
Gain/(Loss) reclassified from Accumulated OCL into income (effective element)	$ 0	$ 1	$ 0	$ 1
Salaries and Benefits [Member]
Derivative [Line Items]
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	Labor and Related Expense	Labor and Related Expense	Labor and Related Expense	Labor and Related Expense
Gain/(Loss) reclassified from Accumulated OCL into income (effective element)	$ 0	$ (1)	$ (1)	$ 1

Derivative Financial Instrume_5

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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Other income, net [Member] | Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Gain (loss) recognized in income	$ 8	$ (20)	$ 16	$ (26)

Debt - Schedule of Current and

Debt - Schedule of Current and Long-term Debt (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Current debt	$ 899,000,000	$ 250,000,000
Long-term debt, excluding current maturities	4,565,000,000	4,471,000,000
Revolving15 Billion Dollar Credit Facility Member | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	1,500,000,000
4.625% senior notes due 2023 [Member]
Debt Instrument [Line Items]
Current debt	$ 250,000,000	$ 250,000,000
Stated interest rate	4.625%	4.625%
Debt instrument maturity year	2023	2023
3.600% senior notes due 2024 [Member]
Debt Instrument [Line Items]
Current debt	$ 649,000,000	$ 0
Stated interest rate	3.60%	3.60%
Debt instrument maturity year	2024	2024
Long-term debt, excluding current maturities	$ 0	$ 649,000,000
4.400% senior notes due 2026 [Member]
Debt Instrument [Line Items]
Stated interest rate	4.40%	4.40%
Debt instrument maturity year	2026	2026
Long-term debt, excluding current maturities	$ 547,000,000	$ 547,000,000
4.650% senior notes due 2027 [ Member]
Debt Instrument [Line Items]
Stated interest rate	4.65%	4.65%
Debt instrument maturity year	2027	2027
Long-term debt, excluding current maturities	$ 744,000,000	$ 744,000,000
4.500% senior notes due 2028 [Member]
Debt Instrument [Line Items]
Stated interest rate	4.50%	4.50%
Debt instrument maturity year	2028	2028
Long-term debt, excluding current maturities	$ 597,000,000	$ 597,000,000
2.950% senior notes due 2029 [Member]
Debt Instrument [Line Items]
Stated interest rate	2.95%	2.95%
Debt instrument maturity year	2029	2029
Long-term debt, excluding current maturities	$ 726,000,000	$ 726,000,000
5.350% senior notes due 2033 [Member]
Debt Instrument [Line Items]
Stated interest rate	5.35%	5.35%
Debt instrument maturity year	2033	2033
Long-term debt, excluding current maturities	$ 742,000,000	$ 0
6.125% senior notes due 2043 [Member]
Debt Instrument [Line Items]
Stated interest rate	6.125%	6.125%
Debt instrument maturity year	2043	2043
Long-term debt, excluding current maturities	$ 272,000,000	$ 271,000,000
5.050% senior notes due 2048 [Member]
Debt Instrument [Line Items]
Stated interest rate	5.05%	5.05%
Debt instrument maturity year	2048	2048
Long-term debt, excluding current maturities	$ 395,000,000	$ 395,000,000
3.875% senior notes due 2049 [Member]
Debt Instrument [Line Items]
Stated interest rate	3.875%	3.875%
Debt instrument maturity year	2049	2049
Long-term debt, excluding current maturities	$ 542,000,000	$ 542,000,000

Debt - Narrative (Details)

Debt - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	May 17, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.625%
Proceeds from debt, net of issuance costs	$ 742
Senior Notes [Member] | Forecast [Member]
Debt Instrument [Line Items]
Repayment of debt		$ 250
5.350% senior notes due 2033 [Member]
Debt Instrument [Line Items]
Stated interest rate			5.35%	5.35%
Description of interest accrual date			Interest on the 2033 senior notes accrues from May 17, 2023 and will be paid in cash on May 15 and November 15 of each year, commencing on November 15, 2023.
5.350% senior notes due 2033 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 750
Stated interest rate	5.35%
Debt Instrument, Interest Rate, Effective Percentage	5.47%
Maturity Date	May 15, 2033
4.625% senior notes due 2023 [Member]
Debt Instrument [Line Items]
Stated interest rate			4.625%	4.625%

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) $ in Millions		Jun. 30, 2023 USD ($)		Dec. 31, 2022 USD ($)
Contingent consideration [Member] | Fair Value Inputs, Discount Rate [Member]
Liabilities:
Fair value inputs, weighted-average discount rate		0.1003		0.1026
Contingent consideration [Member] | Fair Value Inputs, Discount Rate [Member] | Minimum [Member]
Liabilities:
Fair value inputs, weighted-average discount rate		0.0353
Contingent consideration [Member] | Fair Value Inputs, Discount Rate [Member] | Maximum [Member]
Liabilities:
Fair value inputs, weighted-average discount rate		0.138
Recurring [Member]
Assets:
Mutual funds / exchange traded funds		$ 100	[1]	$ 7
Derivative financial instruments	[2]	3		26
Liabilities:
Contingent consideration	[3],[4]	43		40
Derivative financial instruments	[2]	3		5
Recurring [Member] | Fiduciary Assets [Member]
Assets:
Mutual funds / exchange traded funds		182		142
Recurring [Member] | Commingled Funds [Member]
Assets:
Deferred compensation plans	[1],[5]	8
Recurring [Member] | Hedge Funds [Member]
Assets:
Deferred compensation plans	[1],[6]	5
Recurring [Member] | Level 1 [Member]
Assets:
Mutual funds / exchange traded funds		100	[1]	7
Derivative financial instruments	[2]	0		0
Liabilities:
Contingent consideration	[3],[4]	0		0
Derivative financial instruments	[2]	0		0
Recurring [Member] | Level 1 [Member] | Fiduciary Assets [Member]
Assets:
Mutual funds / exchange traded funds		182		142
Recurring [Member] | Level 1 [Member] | Commingled Funds [Member]
Assets:
Deferred compensation plans	[1],[5]	0
Recurring [Member] | Level 1 [Member] | Hedge Funds [Member]
Assets:
Deferred compensation plans	[1],[6]	0
Recurring [Member] | Level 2 [Member]
Assets:
Mutual funds / exchange traded funds		0	[1]	0
Derivative financial instruments	[2]	3		26
Liabilities:
Contingent consideration	[3],[4]	0		0
Derivative financial instruments	[2]	3		5
Recurring [Member] | Level 2 [Member] | Fiduciary Assets [Member]
Assets:
Mutual funds / exchange traded funds		0		0
Recurring [Member] | Level 2 [Member] | Commingled Funds [Member]
Assets:
Deferred compensation plans	[1],[5]	0
Recurring [Member] | Level 2 [Member] | Hedge Funds [Member]
Assets:
Deferred compensation plans	[1],[6]	0
Recurring [Member] | Level 3 [Member]
Assets:
Mutual funds / exchange traded funds		0	[1]	0
Derivative financial instruments	[2]	0		0
Liabilities:
Contingent consideration	[3],[4]	43		40
Derivative financial instruments	[2]	0		0
Recurring [Member] | Level 3 [Member] | Fiduciary Assets [Member]
Assets:
Mutual funds / exchange traded funds		0		$ 0
Recurring [Member] | Level 3 [Member] | Commingled Funds [Member]
Assets:
Deferred compensation plans	[1],[5]	0
Recurring [Member] | Level 3 [Member] | Hedge Funds [Member]
Assets:
Deferred compensation plans	[1],[6]	$ 0
[1] With the exception of the funds included in fiduciary assets, the majority of these balances are held as part of deferred compensation plans with related liabilities in other current liabilities and other non-current liabilities on the condensed consolidated balance sheets. See Note 9 — Derivative Financial Instruments for further information on our derivative investments Consideration due to be paid across multiple years until 2027. 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 10.03 % and 10.26 % at June 30, 2023 and December 31, 2022, respectively. The range of these discount rates was 3.53 % - 13.80 % at June 30, 2023. Using different probability weightings and discount rates could result in an increase or decrease of the contingent consideration payable. Consists of the Towers Watson Global Equity Focus Fund, for which redemptions can occur on any business day, and require a minimum of one business day’s notice. Consists of the Towers Watson Alternative Credit Fund, for which the redemption period is generally quarterly, however requires a 50-day notice.

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value Liabilities Measured Using Significant Unobservable Inputs Level 3 (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance as of beginning of period	$ 40
Obligations assumed	0
Payments	(2)
Realized and unrealized losses	$ 5	[1]
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Cost and Expense, Operating
Foreign exchange	$ 0
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Other Cost and Expense, Operating
Balance as of end of period	$ 43
[1] Realized and unrealized losses include accretion and adjustments to contingent consideration liabilities, which are included within Interest expense and Other operating expenses, respectively, on the condensed consolidated statements of comprehensive income.

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details)	6 Months Ended
	Jun. 30, 2023 USD ($)
Fair Value Disclosures [Abstract]
Fair value significant transfers to or from Level 3	$ 0

Fair Value Measurements - Sch_2

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, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current debt	$ 899	$ 250
Long-term debt	4,565	4,471
Carrying Value [Member] | Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term note receivable	71	68
Current debt	899	250
Long-term debt	4,565	4,471
Fair Value [Member] | Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term note receivable	61	63
Current debt	884	248
Long-term debt	$ 4,202	$ 4,069

Retirement Benefits - Narrative

Retirement Benefits - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Compensation and Retirement Disclosure [Line Items]
Portion of pension and OPEB obligation attributed to disclosed plans (as a percent)			98%
Defined contribution plan, employer contribution	$ 41	$ 38	$ 81	$ 80
Pension Plan [Member] | United States [Member]
Compensation and Retirement Disclosure [Line Items]
Defined benefit pension plans, employer contributions			0
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			10
Defined benefit plan, estimated future employer additional contributions, remainder of fiscal year	8		8
Pension Plan [Member] | Other Foreign Plans [Member]
Compensation and Retirement Disclosure [Line Items]
Defined benefit pension plans, employer contributions			18
Defined benefit plan, estimated future employer additional contributions, remainder of fiscal year	$ 5		$ 5

Retirement Benefits - Net Perio

Retirement Benefits - Net Periodic Benefit Cost (Details) - Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 14	$ 19	$ 28	$ 38
Interest cost	49	30	98	59
Expected return on plan assets	(76)	(82)	(152)	(165)
Settlements	1		1
Amortization of net loss	3	3	6	7
Amortization of prior service credit	0	0	0	0
Net periodic benefit (income)/cost	(9)	(30)	(19)	(61)
United Kingdom [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	4	3	7
Interest cost	30	17	59	36
Expected return on plan assets	(41)	(37)	(80)	(76)
Amortization of net loss	12	7	24	15
Amortization of prior service credit	(3)	(3)	(6)	(6)
Net periodic benefit (income)/cost	0	(12)	0	(24)
Other Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	5	7	11
Interest cost	7	4	14	8
Expected return on plan assets	(10)	(9)	(19)	(19)
Settlements	(1)		(1)
Amortization of net loss	0	1	0	2
Amortization of prior service credit	1	0	1	0
Net periodic benefit (income)/cost	$ 1	$ 1	$ 2	$ 2

Leases - Schedule of Lease Cost

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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Finance lease cost:
Amortization of right-of-use assets	$ 1	$ 1	$ 1	$ 1
Interest on lease liabilities	0	0	1	1
Operating lease cost	37	56	71	95
Variable lease cost	16	16	28	34
Sublease income	(3)	(5)	(6)	(9)
Total lease cost, net	$ 51	$ 68	$ 95	$ 122

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Lessee, Lease, Description [Line Items]
Lease Cost	$ 51	$ 68	$ 95	$ 122
Restructuring Charges [Member]
Lessee, Lease, Description [Line Items]
Lease Cost	$ 4	$ 26	$ 5	$ 31

Supplementary Information for_3

Supplementary Information for Certain Balance Sheet Accounts - Deferred Revenue and Accrued Expenses (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts payable, accrued liabilities and deferred revenue	$ 1,016	$ 975
Accrued discretionary and incentive compensation	397	708
Accrued vacation	199	142
Other employee-related liabilities	73	90
Total deferred revenue and accrued expenses	$ 1,685	$ 1,915

Supplementary Information for_4

Supplementary Information for Certain Balance Sheet Accounts - Provision For Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Claims, lawsuits and other proceedings	$ 319	$ 296
Other provisions	67	61
Total provision for liabilities	$ 386	$ 357

Other Income, Net (Details)

Other Income, Net (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Other Income and Expenses [Abstract]
Gain/(loss) on disposal of operations	[1]	$ 3	$ 22	$ 3	$ (32)
Net periodic pension and postretirement benefit credits		25	69	53	140
Interest in earnings of associates and other investments		1	2	2	4
Foreign exchange gain/(loss)	[2]	1	(1)	(4)	5
Other		5	1	6	3
Other income, net		$ 35	$ 93	$ 60	$ 120
[1] For both the three and six months ended June 30, 2022, includes a $ 24 million non-cash revaluation gain related to an acquisition completed in stages. Includes the offsetting effects of the Company's foreign currency hedging program. See Note 9 — Derivative Financial Instruments.

Other Income, Net (Parenthetica

Other Income, Net (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022
Non-cash Revaluation Gain Related to Acquisition [Member]
Business Acquisition [Line Items]
Gain on disposal of operations	$ 24	$ 24

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance				$ 10,016
Stockholders' equity attributable to parent, ending balance		$ 9,799		9,799
Foreign currency translation [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	[1]	(944)	$ (548)	(987)	$ (489)
Other comprehensive income/ (loss) before reclassifications	[1]	18	(246)	61	(305)
(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax)	[1]	0	0	0	0
Net current-period other comprehensive income/(loss)	[1]	18	(246)	61	(305)
Stockholders' equity attributable to parent, ending balance	[1]	(926)	(794)	(926)	(794)
Derivative instruments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	[1]	11	8	9	11
Other comprehensive income/ (loss) before reclassifications	[1]	1	(2)	3	(3)
(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax)	[1]	0	0	0	(2)
Net current-period other comprehensive income/(loss)	[1]	1	(2)	3	(5)
Stockholders' equity attributable to parent, ending balance	[1]	12	6	12	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	[2]	(1,635)	(1,702)	(1,643)	(1,708)
Other comprehensive income/ (loss) before reclassifications	[2]	1	(4)	0	(2)
(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax)	[2]	8	8	17	12
Net current-period other comprehensive income/(loss)	[2]	9	4	17	10
Stockholders' equity attributable to parent, ending balance	[2]	(1,626)	(1,698)	(1,626)	(1,698)
Total [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance		(2,568)	(2,242)	(2,621)	(2,186)
Other comprehensive income/ (loss) before reclassifications		20	(252)	64	(310)
(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax)		8	8	17	10
Net current-period other comprehensive income/(loss)		28	(244)	81	(300)
Stockholders' equity attributable to parent, ending balance		$ (2,540)	$ (2,486)	$ (2,540)	$ (2,486)
[1] Reclassification adjustments from accumulated other comprehensive loss related to derivative instruments are included in Revenue and Salaries and benefits in the accompanying condensed consolidated statements of comprehensive income. See Note 9 — Derivative Financial Instruments for additional details regarding the reclassification adjustments for the derivative settlements. Reclassification adjustments from accumulated other comprehensive loss are included in the computation of net periodic pension cost (see Note 12 — Retirement Benefits). These components are included in Other income, net in the accompanying condensed consolidated statements of comprehensive income.

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification from AOCI, Current Period, Tax	$ (3)	$ (1)	$ (6)	$ (4)

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Restricted share units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Antidilutive securities excluded from computation of earnings per share		0.3		0.2
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Antidilutive securities excluded from computation of earnings per share	0	0	0	0
Time-based award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share units outstanding	0.5	0.4	0.5	0.4
Performance-Based Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding	0	0.1	0	0.1
Restricted share units outstanding	0.6	0.7	0.6	0.7

Earnings Per Share - Basic and

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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Income from continuing operations	$ 96	$ 160	$ 302	$ 274
Less: income attributable to non-controllable interests	(2)	(5)	(5)	(8)
Income from continuing operations attributable to WTW	94	155	297	266
Income from discontinued operations, net of tax	$ 0	$ (46)	$ 0	$ (35)
Basic average number of shares outstanding (shares)	107	112	107	115
Dilutive effect of potentially issuable shares (shares)	0	0	0	0
Diluted average number of shares outstanding (shares)	107	112	107	115
Basic earnings per share from continuing operations attributable to WTW	$ 0.88	$ 1.38	$ 2.78	$ 2.31
Dilutive effect of potentially issuable shares	0	0	0	0
Diluted earnings per share from continuing operations attributable to WTW	0.88	1.38	2.77	2.31
Basic earnings per share from discontinued operations, net of tax		(0.41)		(0.3)
Dilutive effect of potentially issuable shares	$ 0		$ (0.01)	0
Diluted earnings per share from discontinued operations, net of tax		$ (0.41)		$ (0.3)

Supplemental Disclosures of C_3

Supplemental Disclosures of Cash Flow Information (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Supplemental disclosures of cash flow information:
Cash and cash equivalents		$ 1,602	$ 1,920	$ 1,262
Fiduciary funds (included in fiduciary assets)		2,402	3,183
Cash and cash equivalents and fiduciary funds (included in current assets held for sale)		0	5
Total cash, cash equivalents and restricted cash		4,004	5,108
Increase/(decrease) in cash, cash equivalents and other restricted cash	[1]	(718)	(2,413)
Non-Fiduciary [Member]
Supplemental disclosures of cash flow information:
Increase/(decrease) in cash, cash equivalents and other restricted cash		345	(2,515)
Fiduciary [Member]
Supplemental disclosures of cash flow information:
Increase/(decrease) in cash, cash equivalents and other restricted cash		$ (1,063)	$ 102
[1] The amounts of cash, cash equivalents and restricted cash, their respective classification on the condensed consolidated balance sheets as well as their respective portions of the increase or decrease in cash, cash equivalents and restricted cash for each of the periods presented have been included in Note 19 — Supplemental Disclosures of Cash Flow Information.