10-Q

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

_____________________________________________ 

FORM 10-Q

_____________________________________________ 

(Mark One)

☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended September 30, 2021

OR

☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from to

____________________________________________ 

Marsh & McLennan Companies, Inc.

1166 Avenue of the Americas

New York, New York 10036

(212) 345-5000

_____________________________________________ 

Commission file number 1-5998

State of Incorporation: Delaware

I.R.S. Employer Identification No. 36-2668272

_____________________________________________ 

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading symbol(s)	Name of exchange on which registered
Common Stock, par value $1.00 per share	MMC	New York Stock Exchange
		Chicago Stock Exchange
		London Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ý    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ý    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large Accelerated Filer	☒	Accelerated Filer	☐
Non-Accelerated Filer	☐(Do not check if a smaller reporting company)	Smaller Reporting Company	☐
		Emerging Growth Company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.    ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).     Yes  ☐   No  ý

As of October 15, 2021, there were outstanding 504,895,367 shares of common stock, par value $1.00 per share, of the registrant.

INFORMATION CONCERNING FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q contains "forward-looking statements," as defined in the Private Securities Litigation Reform Act of 1995. These statements, which express management's current views concerning future events or results, use words like "anticipate," "assume," "believe," "continue," "estimate," "expect," "intend," "plan," "project" and similar terms, and future or conditional tense verbs like "could," "may," "might," "should," "will" and "would."

Forward-looking statements are subject to inherent risks and uncertainties that could cause actual results to differ materially from those expressed or implied in our forward-looking statements. Factors that could materially affect our future results include, among other things:

•the increasing prevalence of ransomware, supply chain and other forms of cyber attacks, and their potential to disrupt our operations and result in the disclosure of confidential client or company information;

•the impact from lawsuits or investigations arising from errors and omissions, breaches of fiduciary duty or other claims against us in our capacity as a broker or investment advisor;

•increased regulatory activity and scrutiny by regulatory or law enforcement authorities;

•the financial and operational impact of complying with laws and regulations where we operate and the risks of noncompliance with such laws by us or third-party providers, including anti-corruption laws such as the U.S. Foreign Corrupt Practices Act, U.K. Anti-Bribery Act and cybersecurity and data privacy regulations such as the E.U.’s General Data Protection Regulation;

•the impact of COVID-19, including emerging vaccine mandates, on our business operations, results of operations, cash flows and financial position;

•our ability to compete effectively and adapt to changes in the competitive environment, including to respond to technological change, disintermediation, digital disruption and other types of innovation;

•our ability to manage risks associated with our investment management and related services business, particularly in the context of uncertain equity markets, including our ability to execute timely trades in light of increased trading volume and to manage potential conflicts of interest;

•our ability to attract and retain industry leading talent;

•the impact of changes in tax laws, guidance and interpretations, or disagreements with tax authorities; and

•the regulatory, contractual and reputational risks that arise based on insurance placement activities and insurer revenue streams.

The factors identified above are not exhaustive. Marsh & McLennan Companies, Inc. and its subsidiaries (the "Company" or "Marsh McLennan") operate in a dynamic business environment in which new risks emerge frequently. Accordingly, we caution readers not to place undue reliance on any forward-looking statements, which are based only on information currently available to us and speak only as of the dates on which they are made. The Company undertakes no obligation to update or revise any forward-looking statement to reflect events or circumstances arising after the date on which it is made.

Further information concerning Marsh McLennan and its businesses, including information about factors that could materially affect our results of operations and financial condition, is contained in the Company's filings with the Securities and Exchange Commission, including the "Risk Factors" section and the "Management’s Discussion and Analysis of Financial Condition and Results of Operations" section of this Quarterly Report on Form 10-Q and our most recently filed Annual Report on Form 10-K.

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TABLE OF CONTENTS

PART I. FINANCIAL INFORMATION		4
ITEM 1.	FINANCIAL STATEMENTS (UNAUDITED)	4
	CONSOLIDATED STATEMENTS OF INCOME	4
	CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME	5
	CONSOLIDATED BALANCE SHEETS	6
	CONSOLIDATED STATEMENTS OF CASH FLOWS	8
	CONSOLIDATED STATEMENTS OF EQUITY	9
	NOTES TO CONSOLIDATED FINANCIAL STATEMENTS	10
ITEM 2.	MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS	36
	OF OPERATIONS
ITEM 3.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	49
ITEM 4.	CONTROLS & PROCEDURES	50
PART II. OTHER INFORMATION		51
ITEM 1.	LEGAL PROCEEDINGS	51
ITEM 1A.	RISK FACTORS	51
ITEM 2.	UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	51
ITEM 3.	DEFAULTS UPON SENIOR SECURITIES	51
ITEM 4.	MINE SAFETY DISCLOSURE	51
ITEM 5.	OTHER INFORMATION	51
ITEM 6.	EXHIBITS	51

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PART I.    FINANCIAL INFORMATION

Item 1.Financial Statements.

MARSH & McLENNAN COMPANIES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME

(Unaudited)

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions, except per share data)	2021		2020		2021		2020
Revenue	$	4,583	$	3,968	$	14,683	$	12,808
Expense:
Compensation and benefits	2,853		2,495		8,520		7,479
Other operating expenses	990		933		2,837		2,834
Operating expenses	3,843		3,428		11,357		10,313
Operating income	740		540		3,326		2,495
Other net benefit credits	69		60		211		187
Interest income	1		1		2		5
Interest expense	(107)		(128)		(335)		(387)
Investment income (loss)	13		(14)		43		(47)
Income before income taxes	716		459		3,247		2,253
Income tax expense	174		139		880		586
Net income before non-controlling interests	542		320		2,367		1,667
Less: Net income attributable to non-controlling interests	5		4		27		25
Net income attributable to the Company	$	537	$	316	$	2,340	$	1,642
Net income per share attributable to the Company:
Basic	$	1.06	$	0.62	$	4.61	$	3.25
Diluted	$	1.05	$	0.62	$	4.56	$	3.21
Average number of shares outstanding:
Basic	506		507		508		506
Diluted	513		512		513		511
Shares outstanding at September 30,	505		507		505		507

The accompanying notes are an integral part of these unaudited consolidated statements.

4

MARSH & McLENNAN COMPANIES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2021		2020		2021		2020
Net income before non-controlling interests	$	542	$	320	$	2,367	$	1,667
Other comprehensive (loss) income, before tax:
Foreign currency translation (loss) gain adjustments	(346)		500		(413)		(200)
Gain (loss) related to pension/post-retirement plans	204		(73)		234		136
Other comprehensive (loss) income, before tax	(142)		427		(179)		(64)
Income tax expense (benefit) on other comprehensive income	50		(7)		56		29
Other comprehensive (loss) income, net of tax	(192)		434		(235)		(93)
Comprehensive income	350		754		2,132		1,574
Less: comprehensive income attributable to non-controlling interest	5		4		27		25
Comprehensive income attributable to the Company	$	345	$	750	$	2,105	$	1,549

The accompanying notes are an integral part of these unaudited consolidated statements.

5

MARSH & McLENNAN COMPANIES, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(In millions, except share data)	(Unaudited) September 30, 2021		December 31, 2020
ASSETS
Current assets:
Cash and cash equivalents	$	1,398	$	2,089
Receivables
Commissions and fees	5,190		4,679
Advanced premiums and claims	120		112
Other	475		677
	5,785		5,468
Less-allowance for credit losses	(161)		(142)
Net receivables	5,624		5,326
Other current assets	855		740
Total current assets	7,877		8,155
Goodwill	15,648		15,517
Other intangible assets	2,587		2,699
Fixed assets (net of accumulated depreciation and amortization of $2,327 at September 30, 2021 and $2,159 at December 31, 2020)	824		856
Pension related assets	1,935		1,768
Right of use assets	1,899		1,894
Deferred tax assets	692		702
Other assets	1,520		1,458
	$	32,982	$	33,049

 The accompanying notes are an integral part of these unaudited consolidated statements.

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MARSH & McLENNAN COMPANIES, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS (Continued)

(In millions, except share data)	(Unaudited) September 30, 2021		December 31, 2020
LIABILITIES AND EQUITY
Current liabilities:
Short-term debt	$	516	$	517
Accounts payable and accrued liabilities	2,833		3,050
Accrued compensation and employee benefits	2,365		2,400
Current lease liabilities	339		342
Accrued income taxes	333		247
Dividends payable	273		—
Total current liabilities	6,659		6,556
Fiduciary liabilities	10,408		8,585
Less – cash and investments held in a fiduciary capacity	(10,408)		(8,585)
	—		—
Long-term debt	10,228		10,796
Pension, post-retirement and post-employment benefits	2,387		2,662
Long-term lease liabilities	1,900		1,924
Liabilities for errors and omissions	356		366
Other liabilities	1,564		1,485
Commitments and contingencies	—		—
Equity:
Preferred stock, $1 par value, authorized 6,000,000 shares, none issued	—		—
Common stock, $1 par value, authorized 1,600,000,000 shares, issued 560,641,640 shares at September 30, 2021 and December 31, 2020	561		561
Additional paid-in capital	1,034		943
Retained earnings	17,589		16,272
Accumulated other comprehensive loss	(5,345)		(5,110)
Non-controlling interests	154		156
	13,993		12,822
Less – treasury shares, at cost, 55,175,963 shares at September 30, 2021 and 52,914,550 shares at December 31, 2020	(4,105)		(3,562)
Total equity	9,888		9,260
	$	32,982	$	33,049

The accompanying notes are an integral part of these unaudited consolidated statements.

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MARSH & McLENNAN COMPANIES, INC. AND SUBSIDIARIES                        

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)

For the Nine Months Ended September 30,
(In millions)	2021		2020
Operating cash flows:
Net income before non-controlling interests	$	2,367	$	1,667
Adjustments to reconcile net income used for operations:
Depreciation and amortization of fixed assets and capitalized software	291		282
Amortization of intangible assets	278		265
Non cash lease expense	241		241
Adjustments and payments related to contingent consideration assets and liabilities	(16)		(14)
Provision for deferred income taxes	7		6
Net (gain) loss on investments	(43)		47
Net (gain) loss on disposition of assets	(37)		9
Share-based compensation expense	263		219
Changes in assets and liabilities:
Net receivables	(336)		77
Other current assets	(114)		(14)
Other assets	(115)		69
Accounts payable and accrued liabilities	(66)		(144)
Accrued compensation and employee benefits	(53)		(431)
Accrued income taxes	92		150
Contributions to pension and other benefit plans in excess of current year credit	(282)		(240)
Other liabilities	(96)		74
Operating lease liabilities	(262)		(254)
Effect of exchange rate changes	(45)		(10)
Net cash provided by operations	2,074		1,999
Financing cash flows:
Purchase of treasury shares	(734)		—
Borrowings from term-loan and credit facilities	—		1,000
Proceeds from issuance of debt	—		737
Repayments of debt	(512)		(1,011)
Purchase of non-controlling interests	—		(3)
Shares withheld for taxes on vested units – treasury shares	(99)		(131)
Issuance of common stock from treasury shares	115		98
Payments of deferred and contingent consideration for acquisitions	(110)		(125)
Receipts of contingent consideration for dispositions	71		—
Distributions of non-controlling interests	(27)		(26)
Dividends paid	(750)		(702)
Net cash used for financing activities	(2,046)		(163)
Investing cash flows:
Capital expenditures	(268)		(278)
Net sale of long term investments	2		102
Dispositions	84		93
Acquisitions	(401)		(559)
Other, net	(6)		(4)
Net cash used for investing activities	(589)		(646)
Effect of exchange rate changes on cash and cash equivalents	(130)		43
(Decrease) increase in cash and cash equivalents	(691)		1,233
Cash and cash equivalents at beginning of period	2,089		1,155
Cash and cash equivalents at end of period	$	1,398	$	2,388

The accompanying notes are an integral part of these unaudited consolidated statements.

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MARSH & McLENNAN COMPANIES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF EQUITY

(Unaudited)

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions, except per share data)	2021		2020		2021		2020
COMMON STOCK
Balance, beginning and end of period	$	561	$	561	$	561	$	561
ADDITIONAL PAID-IN CAPITAL
Balance, beginning of period	$	945	$	814	$	943	$	862
Change in accrued stock compensation costs	89		69		41		6
Issuance of shares under stock compensation plans and employee stock purchase plans	—		(1)		50		15
Other	—		—		—		(1)
Balance, end of period	$	1,034	$	882	$	1,034	$	882
RETAINED EARNINGS
Balance, beginning of period	$	17,597	$	16,060	$	16,272	$	15,199
Net income attributable to the Company	537		316		2,340		1,642
Dividend equivalents declared	(2)		(3)		(8)		(9)
Dividends declared	(543)		(471)		(1,015)		(930)
Balance, end of period	$	17,589	$	15,902	$	17,589	$	15,902
ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME
Balance, beginning of period	$	(5,153)	$	(5,582)	$	(5,110)	$	(5,055)
Other comprehensive (loss) income, net of tax	(192)		434		(235)		(93)
Balance, end of period	$	(5,345)	$	(5,148)	$	(5,345)	$	(5,148)
TREASURY SHARES
Balance, beginning of period	$	(3,842)	$	(3,627)	$	(3,562)	$	(3,774)
Issuance of shares under stock compensation plans and employee stock purchase plans	37		21		191		168
Purchase of treasury shares	(300)		—		(734)		—
Balance, end of period	$	(4,105)	$	(3,606)	$	(4,105)	$	(3,606)
NON-CONTROLLING INTERESTS
Balance, beginning of period	$	156	$	166	$	156	$	150
Net income attributable to non-controlling interests	5		4		27		25
Net non-controlling interests disposed	—		—		—		(1)
Distributions and other changes	(7)		(9)		(29)		(13)
Balance, end of period	$	154	$	161	$	154	$	161
TOTAL EQUITY	$	9,888	$	8,752	$	9,888	$	8,752
Dividends declared per share	$	1.07	$	0.93	$	2.00	$	1.84

The accompanying notes are an integral part of these unaudited consolidated statements.

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MARSH & McLENNAN COMPANIES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1.     Nature of Operations

Marsh & McLennan Companies, Inc. (the "Company" or "Marsh McLennan"), a global professional services firm, is organized based on the different services that it offers. Under this structure, the Company’s two business segments are Risk and Insurance Services and Consulting.

The Risk and Insurance Services segment ("RIS") provides risk management solutions, services, advice and insurance broking, reinsurance broking and insurance program management services for businesses, public entities, insurance companies, associations, professional services organizations, and private clients. The Company conducts business in this segment through Marsh and Guy Carpenter. Marsh advises individual and commercial clients of all sizes on insurance broking and innovative risk management solutions. Guy Carpenter develops advanced risk, reinsurance and capital strategies that help clients grow profitably and pursue emerging opportunities.

The Company conducts business in its Consulting segment through Mercer and Oliver Wyman Group. Mercer provides consulting expertise, advice, services and solutions in the areas of health, wealth and career consulting services and products. Oliver Wyman Group provides specialized management and economic and brand consulting services.

Business Update Related To COVID-19

The World Health Organization declared COVID-19 a pandemic in March 2020. The pandemic has impacted businesses globally including virtually every geography in which the Company operates. Governments continue to ease restrictions or fully reopen their economies, as the various vaccines are effective in mitigating the effects of the virus. Our businesses have been resilient throughout the pandemic and demand for our advice and services remains strong as the global economic conditions improve.

Although the vast majority of colleagues continue to work in a remote environment, the Company has provided guidelines on a gradual and phased return to the office depending on the level of virus containment and local health and safety regulations in each geography. The safety and well-being of our colleagues is paramount and the Company expects to continue to service clients effectively in the current remote environment and as colleagues gradually return to the office.

The Company had strong revenue growth through the first nine months of 2021 and benefited from the continued recovery of the global economy. However, uncertainty remains in the economic outlook and the ultimate extent of COVID-19 impact to the Company will depend on future developments that it is unable to predict, including new "waves" of infection from emerging variants of the virus, potential renewed restrictions and mandates by various governments or agencies, and the distribution and uptake of vaccines.

2.     Principles of Consolidation and Other Matters

The Company prepared the consolidated financial statements included herein pursuant to the rules and regulations of the Securities and Exchange Commission. For interim filings, certain information and disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been omitted pursuant to such rules and regulations. The Company believes that the information and disclosures presented are adequate to make such information and disclosures not misleading. These consolidated financial statements should be read in conjunction with the consolidated financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 (the "2020 Form 10-K").

The financial information contained herein reflects all normal recurring adjustments which are, in the opinion of management, necessary for a fair presentation of the Company’s consolidated financial statements as of and for the nine months ended September 30, 2021 and 2020.

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Estimates: The preparation of the consolidated financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expense during the reporting period. On an ongoing basis, the Company evaluates its estimates, judgments and methodologies. The estimates are based on historical experience and on various other assumptions that the Company believes are reasonable. Such matters include:

•the allowance for current expected credit losses on receivables

•estimates of revenue

•impairment assessments and charges

•recoverability of long-lived assets

•liabilities for errors and omissions

•deferred tax assets, uncertain tax positions and income tax expense

•share-based and incentive compensation expense

•useful lives assigned to long-lived assets, and depreciation and amortization

•fair value estimates of contingent consideration receivable or payable related to acquisitions or dispositions

The Company believes these estimates are reasonable based on information currently available at the time they are made. The Company also considered any COVID-19 potential impacts to its customer base in various industries and geographies. Insurance exposures subject to variable factors are subject to mid-term and end of term adjustments, as well as policy audits, which may reduce premiums and corresponding commissions. Estimates were updated based on internal and industry specific economic data. The ultimate extent to which COVID-19 will directly or indirectly impact the Company’s businesses, results of operations and financial condition will depend on numerous evolving factors and future developments that it is not able to predict. Actual results may differ from these estimates.

Cash and Cash Equivalents

Cash and cash equivalents primarily consist of certificates of deposit and time deposits, with original maturities of three months or less, and money market funds. The estimated fair value of the Company's cash and cash equivalents approximates their carrying value. The Company is required to maintain operating funds primarily related to regulatory requirements outside of the United States or as collateral under captive insurance arrangements. At September 30, 2021, the Company maintained $306 million compared to $270 million at December 31, 2020 related to these regulatory requirements.

Allowance for Credit Losses on Accounts Receivable

The Company’s policy for providing an allowance for credit losses on its accounts receivable is based on a combination of factors, including historical write-offs, aging of balances, and other qualitative and quantitative analyses. The charge related to expected credit losses was immaterial to the consolidated statement of income for the three and nine months ended September 30, 2021 and 2020.

Investments

The caption "Investment income (loss)" in the consolidated statements of income comprises realized and unrealized gains and losses from investments recognized in earnings. It includes, when applicable, other than temporary declines in the value of securities, mark-to-market increases or decreases in equity investments with readily determinable fair values and equity method gains or losses on the Company's investments in private equity funds.

The Company holds investments in certain private equity funds that are accounted for in accordance with the equity method of accounting using a consistently applied three-month lag period adjusted for any known significant changes from the lag period to the reporting date of the Company. The underlying private equity funds follow investment company accounting, where investments within the fund are carried at fair value. Investment gains or losses for the Company's proportionate share of the change in fair value of the funds are recorded in earnings. Investments accounted for using the equity method of accounting are included in "other assets" in the consolidated balance sheets.

The Company recorded net investment income of $13 million and $43 million for the three and nine months ended September 30, 2021 compared to net investment losses of $14 million and $47 million for the same periods last

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year. The income in 2021 is primarily driven by gains in the Company's private equity investments compared to losses for the same periods in prior year. The net investment loss reported in the third quarter of 2020 is primarily

due to the mark-to-market change related to the Company's investment in Alexander Forbes ("AF"). The net

investment loss for the nine months ended September 30, 2020 also includes a loss of $23 million from the sale of

shares of AF during the second quarter of 2020, as well as losses related to its private equity fund investments.

Income Taxes

The Company's effective tax rate in the third quarter of 2021 was 24.2% compared with 30.3% in the third quarter of 2020. The effective tax rates for the nine months ended September 30, 2021 and 2020 were 27.1% and 26.0%, respectively.

The rate in the third quarter of 2021 reflects tax benefits from planning implemented in the period that postponed the utilization of current-year losses in the U.K. to a future year when the tax rate will be 25%, additional tax benefits related to share-based compensation offset by changes to uncertain tax positions, deferred tax and other tax adjustments. The rate in the nine months ended September 30, 2021 reflects the charge recorded in the second quarter of approximately $100 million to re-measure the Company’s U.K. deferred tax assets and liabilities upon the enactment of legislation on June 10, 2021, commonly referred to as the "Finance Act 2021". The legislation increased the U.K. corporate income tax rate from 19% to 25% effective April 1, 2023. This is the most significant discrete item in the year-to-date period, increasing the Company’s effective tax rate by 3.1% for the nine months ended September 30, 2021.

The rate in the third quarter and nine months ended September 30, 2020 reflects costs of re-measuring the Company’s U.K. deferred tax assets and liabilities upon the enactment of legislation that cancelled a scheduled 2% reduction in the U.K. corporate income tax rate, partially offset by tax benefits for the implementation of a new international funding structure to facilitate global staffing and contracting.

The tax rates in both periods reflect the impact of discrete tax items such as excess tax benefits related to share-based compensation, enacted tax legislation, changes in uncertain tax positions, deferred tax adjustments and nontaxable adjustments to contingent acquisition consideration.

The Company's tax rate reflects its income, statutory tax rates, and tax planning in the various jurisdictions in which it operates. Significant judgment is required in determining the annual effective tax rate and in evaluating uncertain tax positions.

Losses in one jurisdiction, generally, cannot offset earnings in another, and within certain jurisdictions profits and losses may not offset between entities. Consequently, losses in certain jurisdictions may require valuation allowances affecting the effective tax rate, depending on estimates of the realizability of associated deferred tax assets. The tax rate is also sensitive to changes in unrecognized tax benefits, including the impact of settled tax audits and expired statutes of limitation.

Changes in tax laws or tax rulings may have a significant impact on our effective tax rate. The Company reports a liability for unrecognized tax benefits resulting from uncertain tax positions taken or expected to be taken in tax returns. The Company's gross unrecognized tax benefits was $101 million at September 30, 2021 and $98 million at December 31, 2020. It is reasonably possible that the total amount of unrecognized tax benefits will decrease between zero and approximately $33 million within the next twelve months due to settlements of audits and expirations of statutes of limitation.

Integration and Restructuring Charges

Severance and related costs are recognized based on amounts due under established severance plans or estimates of one-time benefits that will be provided. Typically, severance benefits are recognized when the impacted colleagues are notified of their expected termination and such termination is expected to occur within the legally required notification period. These costs are included in compensation and benefits in the consolidated statements of income.

Costs for real estate consolidation are recognized based on the type of cost, and the expected future use of the facility. For locations where the Company does not expect to sub-lease the property, the amortization of any right-of-use asset is accelerated from the decision date to the cease use date. For locations where the Company expects to sub-lease the properties subsequent to its vacating the property, the right-of-use asset is reviewed for potential impairment at the earlier of the cease use date or the date a sub-lease is signed. To determine the amount of impairment, the fair value of the right-of-use asset is determined based on the present value of the estimated net cash flows related to the property. Contractual costs outside of the right-of-use asset are recognized based on the net present value of expected future cash outflows for which the Company will not receive any benefit. Such

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amounts are based on estimates of future sub-lease income to be received and future contractual costs to be incurred. These costs are included in other operating expenses in the consolidated statements of income.

Other costs related to integration and restructuring, such as moving, legal or consulting costs are recognized as incurred. These costs are included in other operating expenses in the consolidated statements of income.

3.     Revenue

The core principle of the revenue recognition guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The entity applies the following steps to achieve that principle: identify the contract(s) with the customer, identify the performance obligations in the contract(s), determine the transaction price, allocate the transaction price to the performance obligations in the contract and recognize revenue when (or as) the entity satisfies a performance obligation. A performance obligation is satisfied either at a “point in time” or “over time” depending on the nature of the product or service provided, and the specific terms of the contract with customers.

The Company's revenue recognition guidance is provided in more detail in Note 2 of the consolidated financial statements and the notes included in Form 10-K for the year ended December 31, 2020.

The following schedule disaggregates components of the Company's revenue:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2021		2020		2021		2020
Marsh:
EMEA	$	600	$	536	$	2,233	$	1,887
Asia Pacific	281		254		902		790
Latin America	105		93		298		283
Total International	986		883		3,433		2,960
U.S./Canada	1,366		1,126		3,894		3,271
Total Marsh	2,352		2,009		7,327		6,231
Guy Carpenter	314		274		1,697		1,534
Subtotal	2,666		2,283		9,024		7,765
Fiduciary interest income	4		8		12		40
Total Risk and Insurance Services	$	2,670	$	2,291	$	9,036	$	7,805
Mercer:
Wealth	$	613	$	566	$	1,861	$	1,719
Health	449		430		1,398		1,348
Career	253		220		618		549
Total Mercer	1,315		1,216		3,877		3,616
Oliver Wyman Group	610		480		1,813		1,458
Total Consulting	$	1,925	$	1,696	$	5,690	$	5,074

The Company recognizes commission revenue from arrangements for a significant portion of its brokerage arrangements at a point in time on the effective date of the underlying policy. Commission revenue is estimated using historical information about the risks to be covered over the policy period, some of which are dependent on variable factors such as number of employees covered, covered payroll, airline passenger miles flown, shipped tonnage of marine cargo and others.

The following schedule provides contract assets and contract liabilities information from contracts with customers:

(In millions)	September 30, 2021		December 31, 2020
Contract assets	$	307	$	236
Contract liabilities	$	738	$	676

The Company records accounts receivable when the right to consideration is unconditional, subject only to the passage of time. Contract assets primarily relate to quota share reinsurance brokerage and contingent insurer

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revenue. The Company does not have the right to bill and collect revenue for quota share brokerage until the underlying policies written by the ceding insurer attach to the treaty. Contract assets are included in other current assets in the Company's consolidated balance sheets. Contract liabilities primarily relate to the advance consideration received from customers. Contract liabilities are included in current liabilities in the Company's consolidated balance sheets. Revenue recognized in the first nine months of 2021 and 2020 that was included in the contract liability balance at the beginning of each of those years was $511 million and $420 million, respectively.

The amount of revenue recognized in the first nine months of 2021 and 2020 from performance obligations satisfied in previous periods, mainly due to variable consideration from contracts with insurers, quota share business and consulting contracts previously considered constrained was $68 million and $84 million, respectively.

The Company applies the practical expedient and does not disclose the value of unsatisfied performance obligations for (1) contracts with original contract terms of one year or less and (2) contracts where the Company has the right to invoice for services performed. The revenue expected to be recognized in future periods during the non-cancellable term of existing contracts greater than one year that is related to performance obligations that are unsatisfied or partially satisfied at the end of the reporting period is approximately $54 million for Marsh, $204 million for Mercer and $4 million for Oliver Wyman Group. The Company expects revenue in 2022, 2023, 2024, 2025 and 2026 and beyond of $143 million, $66 million, $31 million, $14 million and $8 million, respectively, related to these performance obligations.

4.     Fiduciary Assets and Liabilities

In its capacity as an insurance broker or agent, the Company collects premiums from insureds and, after deducting its commissions, remits the premiums to the respective insurance underwriters. The Company also collects claims or refunds from underwriters on behalf of insureds. Un-remitted insurance premiums and claims proceeds are held by the Company in a fiduciary capacity. Risk and Insurance Services revenue includes interest on fiduciary funds ("fiduciary interest income") of $4 million and $12 million for the three and nine month periods ended September 30, 2021, respectively, and $8 million and $40 million for the three and nine month periods ended September 30, 2020, respectively. The decrease in 2021 compared to 2020 reflects the impact of lower interest rates partially offset by a higher level of average invested funds. Since fiduciary assets are not available for corporate use, they are shown in the consolidated balance sheets as an offset to fiduciary liabilities.

Net uncollected premiums and claims and the related payables amounted to $12.7 billion at September 30, 2021 and $11.2 billion at December 31, 2020. The Company is not a principal to the contracts under which the right to receive premiums or the right to receive reimbursement of insured losses arises. Accordingly, net uncollected premiums and claims and the related payables are not assets and liabilities of the Company and are not included in the accompanying consolidated balance sheets.

In certain instances, the Company advances premiums, refunds or claims to insurance underwriters or insureds prior to collection. These advances are made from corporate funds and are reflected in the accompanying consolidated balance sheets as receivables.

5.    Per Share Data

Basic net income per share attributable to the Company is calculated by dividing the after-tax income attributable to the Company by the weighted average number of outstanding shares of the Company’s common stock.

Diluted net income per share attributable to the Company is calculated by dividing the after-tax income attributable to the Company by the weighted average number of outstanding shares of the Company’s common stock, which have been adjusted for the dilutive effect of potentially issuable common shares.

Basic and Diluted EPS Calculation	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions, except per share data)	2021		2020		2021		2020
Net income before non-controlling interests	$	542	$	320	$	2,367	$	1,667
Less: Net income attributable to non-controlling interests	5		4		27		25
Net income attributable to the Company	$	537	$	316	$	2,340	$	1,642
Basic weighted average common shares outstanding	506		507		508		506
Dilutive effect of potentially issuable common shares	7		5		5		5
Diluted weighted average common shares outstanding	513		512		513		511
Average stock price used to calculate common stock equivalents	$	151.22	$	114.64	$	133.41	$	107.64

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6.    Supplemental Disclosures to the Consolidated Statements of Cash Flows

The following schedule provides additional information concerning acquisitions, interest and income taxes paid for the nine month periods ended September 30, 2021 and 2020.

(In millions)	2021		2020
Assets acquired, excluding cash	$	601	$	795
Liabilities assumed	(59)		(73)
Contingent/deferred purchase consideration	(141)		(163)
Net cash outflow for current year acquisitions	$	401	$	559

(In millions)	2021		2020
Interest paid	$	407	$	437
Income taxes paid, net of refunds	$	686	$	414

The classification of contingent consideration in the statement of cash flows is dependent upon whether the payment was part of the initial liability established on the acquisition date (financing) or an adjustment to the acquisition date liability (operating).

The following amounts are included in the consolidated statements of cash flows as a financing activity. The Company paid deferred and contingent consideration of $110 million for the nine months ended September 30, 2021. This consisted of deferred purchase consideration related to prior years' acquisitions of $84 million and contingent purchase consideration of $26 million. Cash flows from financing activities also reflect the receipt of contingent consideration of $71 million related to prior year dispositions. For the nine months ended September 30, 2020, the Company paid deferred and contingent consideration of $125 million, consisting of deferred purchase consideration related to prior years' acquisitions of $60 million and contingent consideration of $65 million.

The following amounts are included in the operating section of the consolidated statements of cash flows. For the nine months ended September 30, 2021, the Company recorded an expense for adjustments to contingent consideration liabilities of $35 million and made contingent consideration payments of $46 million. In addition, the Company recorded income of $24 million, primarily related to the settlement of contingent consideration receivables and received cash of $19 million related to prior year dispositions. For the nine months ended September 30, 2020, the Company recorded an expense for adjustments to contingent consideration liabilities of $22 million and made contingent consideration payments of $36 million.

The Company had non-cash issuances of common stock under its share-based payment plan of $225 million and $217 million for the nine months ended September 30, 2021 and 2020, respectively. The Company recorded stock-based compensation expense for equity awards related to restricted stock units, performance stock units and stock options of $263 million and $219 million for the nine months ended September 30, 2021 and 2020, respectively.

7.    Other Comprehensive Income (Loss)

The changes, net of tax, in the balances of each component of Accumulated Other Comprehensive Income ("AOCI") for the three and nine months ended September 30, 2021 and 2020, including amounts reclassified out of AOCI, are as follows:

(In millions)	Pension/Post-Retirement Plans Gains (Losses)		Foreign Currency Translation Gains (Losses)		Total Gains (Losses)
Balance as of July 1, 2021	$	(4,102)	$	(1,051)	$	(5,153)
Other comprehensive income (loss) before reclassifications	115		(346)		(231)
Amounts reclassified from accumulated other comprehensive income	39		—		39
Net current period other comprehensive income (loss)	154		(346)		(192)
Balance as of September 30, 2021	$	(3,948)	$	(1,397)	$	(5,345)

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(In millions)	Pension/Post-Retirement Plans Gains (Losses)		Foreign Currency Translation Gains (Losses)		Total Gains (Losses)
Balance as of July 1, 2020	$	(3,346)	$	(2,236)	$	(5,582)
Other comprehensive (loss) income before reclassifications	(94)		497		403
Amounts reclassified from accumulated other comprehensive income	31		—		31
Net current period other comprehensive (loss) income	(63)		497		434
Balance as of September 30, 2020	$	(3,409)	$	(1,739)	$	(5,148)

(In millions)	Pension/Post-Retirement Plans Gains (Losses)		Foreign Currency Translation Gains (Losses)		Total Gains (Losses)
Balance as of December 31, 2020	$	(4,126)	$	(984)	$	(5,110)
Other comprehensive income (loss) before reclassifications	63		(413)		(350)
Amounts reclassified from accumulated other comprehensive income	115		—		115
Net current period other comprehensive income (loss)	178		(413)		(235)
Balance as of September 30, 2021	$	(3,948)	$	(1,397)	$	(5,345)

(In millions)	Pension/Post-Retirement Plans Gains (Losses)		Foreign Currency Translation Gains (Losses)		Total Gains (Losses)
Balance as of December 31, 2019	$	(3,512)	$	(1,543)	$	(5,055)
Other comprehensive income (loss) before reclassifications	12		(196)		(184)
Amounts reclassified from accumulated other comprehensive income	91		—		91
Net current period other comprehensive income (loss)	103		(196)		(93)
Balance as of September 30, 2020	$	(3,409)	$	(1,739)	$	(5,148)

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The components of other comprehensive income (loss) for the three and nine month periods ended September 30, 2021 and 2020 are as follows:

Three Months Ended September 30,	2021						2020
(In millions)	Pre-Tax		Tax (Credit)		Net of Tax		Pre-Tax		Tax (Credit)		Net of Tax
Foreign currency translation adjustments	$	(346)	$	—	$	(346)	$	500	$	3	$	497
Pension/post-retirement plans:
Amortization of gains included in net periodic pension cost:
Net actuarial losses (a)	52		13		39		40		9		31
Subtotal	52		13		39		40		9		31
Foreign currency translation adjustments	88		21		67		(113)		(19)		(94)
Effect of remeasurement	64		16		48		—		—		—
Pension/post-retirement plans gains (losses)	204		50		154		(73)		(10)		(63)
Other comprehensive (loss) income	$	(142)	$	50	$	(192)	$	427	$	(7)	$	434
(a) Components of net periodic pension cost are included in other net benefit credits in the consolidated statements of income. Income tax expense on net actuarial losses are included in income tax expense.

Nine Months Ended September 30,	2021						2020
(In millions)	Pre-Tax		Tax (Credit)		Net of Tax		Pre-Tax		Tax (Credit)		Net of Tax
Foreign currency translation adjustments	$	(413)	$	—	$	(413)	$	(200)	$	(4)	$	(196)
Pension/post-retirement plans:
Amortization of (gains) losses included in net periodic pension cost:
Prior service credits (a)	(1)		—		(1)		(1)		—		(1)
Net actuarial losses (a)	156		40		116		120		28		92
Subtotal	155		40		115		119		28		91
Foreign currency translation adjustments	7		1		6		17		5		12
Other adjustments	(7)		(2)		(5)		—		—		—
Effect of remeasurement	77		17		60		—		—		—
Effect of settlement	2		—		2		—		—		—
Pension/post-retirement plans gains	234		56		178		136		33		103
Other comprehensive (loss) income	$	(179)	$	56	$	(235)	$	(64)	$	29	$	(93)
(a) Components of net periodic pension cost are included in other net benefit credits in the consolidated statements of income. Income tax expense on net actuarial losses are included in income tax expense.

8.     Acquisitions and Dispositions

The Company’s acquisitions have been accounted for as business combinations. Net assets and results of operations are included in the Company’s consolidated financial statements commencing at the respective purchase closing dates. In connection with acquisitions, the Company records the estimated values of the net tangible assets and the identifiable intangible assets purchased, which typically consist of customer relationships, developed technology, trademarks and non-compete agreements. The valuation of purchased intangible assets involves significant estimates and assumptions. The Company estimates the fair value of purchased intangible assets, primarily using the income approach, by determining the present value of future cash flows over the remaining economic life of the respective assets. The significant estimates and assumptions used in this approach include the determination of the discount rate, economic life, future revenue growth rates, expected account attrition rates and earnings margins. Refinement and completion of final valuation of net assets acquired could affect the carrying value of tangible assets, goodwill and identifiable intangible assets.

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The Risk and Insurance Services segment completed three acquisitions during the first nine months ended September 30, 2021:

•April – Marsh McLennan Agency ("MMA") acquired PayneWest Insurance, Inc., a Montana-based full-service broker providing business insurance, surety, employee benefits and personal insurance services to companies and individuals, and The Pryor Group, LLC, a Texas-based full-service broker providing business insurance with a specialty in quick service restaurants and the personal lines of franchise owners.

•September – MMA acquired Vaaler Insurance, Inc., a North Dakota-based insurance broker providing business insurance, employee health and benefits, and personal lines solutions, with specialized expertise in the construction, education, and healthcare industries.

Total purchase consideration for acquisitions made during the nine months ended September 30, 2021 was $546 million, which consisted of cash paid of $405 million and deferred purchase consideration and estimated contingent consideration of $141 million. Contingent consideration arrangements are based primarily on earnings before interest, tax, depreciation and amortization ("EBITDA") or revenue targets over a period of two to four years. The Company also paid $84 million of deferred purchase consideration and $72 million of contingent consideration related to acquisitions made in prior years. Estimated fair values of assets acquired and liabilities assumed are subject to adjustment until purchase accounting is finalized.

The following table presents the preliminary allocation of purchase consideration to the assets acquired and liabilities assumed during 2021 based on the estimated fair values for the acquisitions as of their respective acquisition dates:

Acquisitions through September 30, 2021
(In millions)
Cash	$	405
Estimated fair value of deferred/contingent consideration	141
Total consideration	$	546
Allocation of purchase price:
Cash and cash equivalents	$	4
Accounts receivable, net	32
Fixed assets, net	5
Other intangible assets	190
Goodwill	374
Total assets acquired	605
Current liabilities	27
Other liabilities	32
Total liabilities assumed	59
Net assets acquired	$	546

The purchase price allocation for assets acquired and liabilities assumed is based on estimates that are preliminary in nature and subject to adjustments, which could be material. Any necessary adjustments must be finalized during the measurement period, which for a particular asset, liability, or non-controlling interest ends once the acquirer determines that either (1) the necessary information has been obtained or (2) the information is not available. However, the measurement period for all items is limited to one year from the acquisition date.

The estimation of fair value requires numerous judgments, assumptions and estimates about future events and uncertainties, which could materially impact these values, and the related amortization, where applicable, in the Company’s results of operations.

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The following chart provides information about intangible assets acquired during 2021:

Intangible assets through September 30, 2021 (In millions)	Amount		Weighted Average Amortization Period
Client relationships	$	176	13.7 years
Other	14		3.8 years
	$	190

The consolidated statements of income include the results of operations of acquired companies since their respective acquisition dates. The consolidated statements of income for the three and nine month periods ended September 30, 2021 include revenue of approximately $38 million and $73 million and operating income of $3 million and $4 million for acquisitions made in 2021. The consolidated statements of income for the three and nine month periods ended September 30, 2020 included approximately $52 million and $115 million of revenue, respectively, and operating loss of $8 million and operating income of $3 million, respectively, related to acquisitions made in 2020.

Dispositions

During the first nine months of 2021, the Company sold certain businesses, primarily in the U.S. and the U.K., for cash proceeds of approximately $84 million and recognized a net gain of approximately $50 million, primarily related to the commercial networks business in the U.K. that provided broking and back-office solutions for small independent brokers.

Prior-Year Acquisitions

The Risk and Insurance Services segment completed seven acquisitions during 2020:

•January – MMA acquired Momentous Insurance Brokerage Inc., a California-based full-service risk management and employee benefits firm specializing in high net worth private client services and insurance solutions for the entertainment industry, and Ironwood Insurance Services, LLC, an Atlanta-based broker that provides commercial property/casualty insurance, employee benefits, and private client solutions to mid-size businesses and individuals across the U.S.

•April – MMA acquired Assurance Holdings, Inc., an Illinois-based full service brokerage providing business insurance, employee benefits, private client insurance, and retirement services to businesses and individuals across the U.S.

•June – MMA acquired Nico Insurance Services, Inc., a California-based agency providing employee benefits solutions to groups and individuals.

•December – MMA acquired Heritage Insurance Services, Inc., a Kentucky-based full service broker that provides commercial property and casualty and personal lines primarily in the trucking and transportation industry, Inspro Insurance, Inc., a Nebraska-based full service broker that provides commercial property and casualty insurance, personal lines and employee benefits services, and Compass Financial Partners, LLC, a North Carolina-based retirement consulting and investment advisory firm.

Total purchase consideration for acquisitions made during the nine months ended September 30, 2020 was approximately $742 million, which consisted of cash paid of $579 million and deferred purchase and estimated contingent consideration of $163 million. Contingent consideration arrangements are based primarily on earnings before interest, tax, depreciation and amortization ("EBITDA") or revenue targets over a period of two to four years. For the first nine months of 2020, the Company also paid $60 million of deferred purchase consideration and $101 million of contingent consideration related to acquisitions made in prior years. Estimated fair values of assets acquired and liabilities assumed are subject to adjustment when purchase accounting is finalized.

Prior year dispositions

In the first nine months of 2020, the Company sold certain businesses primarily in the U.S., U.K. and Canada for cash proceeds of approximately $93 million.

Pro-Forma Information

The following unaudited pro-forma financial data gives effect to the acquisitions made by the Company during 2021 and 2020. In accordance with accounting guidance related to pro-forma disclosures, the information presented for acquisitions made in 2021 is as if they occurred on January 1, 2020 and reflects acquisitions made in 2020 as if they occurred on January 1, 2019. The unaudited pro-forma information adjusts for the effects of amortization of

19

acquired intangibles. The unaudited pro-forma financial data is presented for illustrative purposes only and is not necessarily indicative of the operating results that would have been achieved if such acquisitions had occurred on the dates indicated, nor is it necessarily indicative of future consolidated results.

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions, except per share data)	2021		2020		2021		2020
Revenue	$	4,587	$	4,019	$	14,730	$	12,955
Net income attributable to the Company	$	538	$	322	$	2,345	$	1,655
Basic net income per share attributable to the Company	$	1.06	$	0.63	$	4.62	$	3.27
Diluted net income per share attributable to the Company	$	1.05	$	0.63	$	4.57	$	3.24

9.    Goodwill and Other Intangibles

The Company is required to assess goodwill and any indefinite-lived intangible assets for impairment annually, or more frequently if circumstances indicate impairment may have occurred. The Company performs the annual impairment assessment for each of its reporting units during the third quarter of each year. In accordance with applicable accounting guidance, a company can assess qualitative factors to determine whether it is necessary to perform a quantitative goodwill impairment test. Alternatively, the Company may elect to proceed directly to the quantitative goodwill impairment test. In 2021, the Company elected to perform a qualitative impairment assessment. As part of its assessment, the Company considered numerous factors, including:

•that the fair value of each reporting unit exceeds its carrying value by a substantial margin based on its most recent quantitative assessment in 2019;

•whether significant acquisitions or dispositions occurred which might alter the fair value of its reporting units;

•macroeconomic conditions and their potential impact on reporting unit fair values;

•actual performance compared with budget and prior projections used in its estimation of reporting unit fair values;

•industry and market conditions; and

•the year-over-year change in the Company’s share price.

The Company completed its qualitative assessment in the third quarter of 2021 and concluded that goodwill was not impaired.

Other intangible assets that are not deemed to have an indefinite life are amortized over their estimated lives and assessed for impairment upon the occurrence of certain triggering events in accordance with applicable accounting literature. Based on its assessment, the Company concluded that other intangible assets were not impaired. The Company does not have any indefinite lived intangible assets.

Changes in the carrying amount of goodwill are as follows:

September 30,
(In millions)	2021		2020
Balance as of January 1,	$	15,517	$	14,671
Goodwill acquired	374		462
Other adjustments(a)	(243)		(99)
Balance at September 30,	$	15,648	$	15,034

(a) Primarily reflects the impact of foreign exchange.

The goodwill arising from the acquisitions in 2021 and 2020 consist largely of the synergies and economies of scale

expected from combining the operations of the Company and the acquired entities and the trained and assembled

workforce acquired.

The goodwill acquired in 2021 and 2020 included approximately $374 million and $462 million, respectively, of which approximately $25 million and $140 million is deductible for tax purposes, and is primarily related to the Risk and Insurance Services segment.

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Goodwill allocable to the Company’s reportable segments at September 30, 2021 is as follows: Risk and Insurance Services, $11.8 billion and Consulting, $3.8 billion.

The gross cost and accumulated amortization of identified intangible assets at September 30, 2021 and December 31, 2020 are as follows:

	September 30, 2021						December 31, 2020
(In millions)	Gross Cost		Accumulated Amortization		Net Carrying Amount		Gross Cost		Accumulated Amortization		Net Carrying Amount
Client relationships	$	3,827	$	1,331	$	2,496	$	3,713	$	1,170	$	2,543
Other (a)	367		276		91		386		230		156
Amortized intangibles	$	4,194	$	1,607	$	2,587	$	4,099	$	1,400	$	2,699

(a) Primarily non-compete agreements, trade names and developed technology.

Aggregate amortization expense for the nine months ended September 30, 2021 and 2020 was $278 million and $265 million, respectively. The estimated future aggregate amortization expense is as follows:

For the Years Ending December 31,
(In millions)	Estimated Expense
2021 (excludes amortization through September 30, 2021)	$	88
2022	329
2023	302
2024	281
2025	241
Subsequent years	1,346
Total future amortization	$	2,587

10.     Fair Value Measurements

Fair Value Hierarchy

The Company has categorized its assets and liabilities that are valued at fair value on a recurring basis into a three-level fair value hierarchy as defined by the FASB. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets and liabilities (Level 1) and lowest priority to unobservable inputs (Level 3). In some cases, the inputs used to measure fair value might fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy, for disclosure purposes, is determined based on the lowest level input that is significant to the fair value measurement. Assets and liabilities recorded in the consolidated balance sheets at fair value are categorized based on the inputs in the valuation techniques as follows:

Level 1.Assets and liabilities whose values are based on unadjusted quoted prices for identical assets or liabilities in an active market (examples include active exchange-traded equity securities and exchange-traded money market mutual funds).

Assets and liabilities measured using Level 1 inputs include exchange-traded equity securities, exchange-traded mutual funds and money market funds.

Level 2.Assets and liabilities whose values are based on the following:

a)Quoted prices for similar assets or liabilities in active markets;

b)Quoted prices for identical or similar assets or liabilities in non-active markets (examples include corporate and municipal bonds, which trade infrequently);

c)Pricing models whose inputs are observable for substantially the full term of the asset or liability (examples include most over-the-counter derivatives, including interest rate and currency swaps); and

d)Pricing models whose inputs are derived principally from or corroborated by observable market data through correlation or other means for substantially the full asset or liability (for example, certain mortgage loans).

Assets and liabilities using Level 2 inputs are related to an equity security.

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Level 3.Assets and liabilities whose values are based on prices, or valuation techniques that require inputs that are both unobservable and significant to the overall fair value measurement. These inputs reflect management’s own assumptions about the assumptions a market participant would use in pricing the asset or liability.

Assets and liabilities measured using Level 3 inputs relate to assets and liabilities for contingent purchase consideration.

Valuation Techniques

Equity Securities, Money Market Mutual Funds and Mutual Funds – Level 1

Investments for which market quotations are readily available are valued at the sale price on their principal exchange or, for certain markets, official closing bid price. Money market mutual funds are valued using a valuation technique that results in price per share at $1.00.

Contingent Purchase Consideration Assets and Liabilities – Level 3

Purchase consideration for some acquisitions and dispositions made by the Company include contingent consideration arrangements. Contingent consideration arrangements are based primarily on EBITDA or revenue targets over a period of two to four years. The fair value of the contingent purchase consideration asset and liability is estimated as the present value of future cash flows to be paid, based on projections of revenue and earnings and related targets of the acquired and disposed entities.

The following fair value hierarchy table presents information about the Company’s assets and liabilities measured at fair value on a recurring basis as of September 30, 2021 and December 31, 2020:

	Identical Assets (Level 1)				Observable Inputs (Level 2)				Unobservable Inputs (Level 3)				Total
(In millions)	09/30/21		12/31/20		09/30/21		12/31/20		09/30/21		12/31/20		09/30/21		12/31/20
Assets:
Financial instruments owned:
Exchange traded equity securities(a)	$	60	$	59	$	—	$	—	$	—	$	—	$	60	$	59
Mutual funds(a)	193		186		—		—		—		—		193		186
Money market funds(b)	106		587		—		—		—		—		106		587
Other equity investment(a)	—		—		8		8		—		—		8		8
Contingent purchase consideration assets(c)	—		—		—		—		5		68		5		68
Total assets measured at fair value	$	359	$	832	$	8	$	8	$	5	$	68	$	372	$	908
Fiduciary Assets:
U.S. treasury bills	$	75	$	150	$	—	$	—	$	—	$	—	$	75	$	150
Money market funds	244		173		—		—		—		—		244		173
Total fiduciary assets measured at fair value	$	319	$	323	$	—	$	—	$	—	$	—	$	319	$	323
Liabilities:
Contingent purchase consideration liability(d)	$	—	$	—	$	—	$	—	$	303	$	243	$	303	$	243
Total liabilities measured at fair value	$	—	$	—	$	—	$	—	$	303	$	243	$	303	$	243

(a) Included in other assets in the consolidated balance sheets.

(b) Included in cash and cash equivalents in the consolidated balance sheets.

(c) Included in other receivables in the consolidated balance sheets.

(d) Included in accounts payable and accrued liabilities and other liabilities in the consolidated balance sheets.

The Level 3 assets in the chart reflect contingent purchase consideration from the sale of businesses. The change in the contingent purchase consideration assets from December 31, 2020 is driven primarily by cash receipts of approximately $90 million. This decrease was partially offset by the impact of accretion and adjustments to the fair value of the contingent purchase consideration assets.

During the nine months ended September 30, 2021, there were no assets or liabilities that were transferred between levels.

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The following table sets forth a summary of the changes in fair value of the Company’s Level 3 liabilities for the three and nine month periods ended September 30, 2021 and 2020:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2021		2020		2021		2020
Balance at beginning of period	$	340	$	233	$	243	$	225
Net additions	1		—		99		96
Payments	(54)		(23)		(72)		(101)
Revaluation impact	18		18		35		8
Other (a)	(2)		2		(2)		2
Balance at September 30,	$	303	$	230	$	303	$	230

(a) Primarily reflects the impact of foreign exchange.

Long-Term Investments

The Company holds investments in public and private companies as well as certain private equity investments that are accounted for using the equity method of accounting. The carrying value of these investments was $328 million and $280 million at September 30, 2021 and December 31, 2020, respectively.

Investments in Public and Private Companies

The Company has investments in private insurance and consulting companies with a carrying value of $178 million and $169 million at September 30, 2021 and December 31, 2020, respectively. These investments are accounted for using the equity method of accounting, the results of which are included in revenue in the consolidated statements of income and the carrying value of which is included in other assets in the consolidated balance sheets. The Company records its share of income or loss on its equity method investments, some of which are on a one quarter lag basis.

Private Equity Investments

The Company's investments in private equity funds were $150 million and $111 million at September 30, 2021 and December 31, 2020, respectively. The carrying values of these private equity investments approximate fair value. The underlying private equity funds follow investment company accounting, where investments within the fund are carried at fair value. The Company records in earnings its proportionate share of the change in fair value of the funds on the investment income (loss) line in the consolidated statements of income. These investments are included in other assets in the consolidated balance sheets. The Company recorded net investment gains of $13 million and $40 million for the three and nine month periods ended September 30, 2021, respectively, and gain of $2 million and loss of $6 million from these investments for the same periods in 2020.

Other Investments

At September 30, 2021 and December 31, 2020, the Company held certain equity investments with readily determinable market values of $74 million and $72 million, respectively, including an investment in the common stock of Alexander Forbes ("AF") of $55 million at September 30, 2021 and $54 million at December 31, 2020. The Company also held investments without readily determinable market values of $33 million at both September 30, 2021 and December 31, 2020.

The Company sold 242 million shares of the common stock of AF during 2020. The investment in AF, which was accounted for using the equity method of accounting prior to the sale of these shares, is accounted for at fair value, with investment gains and losses recorded as investment income (loss) in the consolidated statement of income.

11.    Derivatives

Net Investment Hedge

The Company has investments in various subsidiaries with Euro functional currencies. As a result, the Company is exposed to the risk of fluctuations between the Euro and U.S. dollar exchange rates. The Company designated its €1.1 billion senior note debt instruments ("euro notes") as a net investment hedge (the "hedge") of its Euro denominated subsidiaries. The hedge effectiveness is re-assessed each quarter to confirm that the designated equity balance at the beginning of each period continues to equal or exceed 80% of the outstanding balance of the Euro debt instrument and that all the critical terms of the hedging instrument and the hedged net investment continue to match. The Company concluded that the hedge continues to be highly effective as of September 30,

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2021, and the change in the debt balance related to foreign exchange fluctuations was recorded in foreign currency translation gains (losses) in the consolidated balance sheet. The U.S. dollar value of the euro notes decreased $63 million through September 30, 2021 due to the impact of foreign exchange rates, with a corresponding decrease to accumulated other comprehensive loss.

12.    Leases

A lease is defined as a party obtaining the right to use an asset legally owned by another party. The Company determines if an arrangement is a lease at inception. Operating leases are recognized on the balance sheet as Right-of-Use ("ROU") assets and operating lease liabilities based on the present value of the remaining future minimum payments over the lease term at commencement date of the lease.

The Company uses discount rates to determine the present value of future lease payments. The Company primarily uses its incremental borrowing rate adjusted to reflect a secured rate, based on the information available for leases, including the lease term and interest rate environment in the country in which the lease exists. The lease terms used to calculate the ROU asset and lease liability may include options to extend or terminate when it is reasonably certain that the Company will exercise that option.

The Company leases office facilities under non-cancelable operating leases with terms generally ranging between 10 and 25 years. The Company utilizes these leased office facilities for use by its employees in countries in which the Company conducts its business. Leases are negotiated with third-parties and, in some instances contain renewal, expansion and termination options. The Company also subleases certain office facilities to third-parties when the Company no longer utilizes the space. None of the Company’s leases restrict the payment of dividends or the incurrence of debt or additional lease obligations, or contain significant purchase options. In addition to the base rental costs, our lease agreements generally provide for rent escalations resulting from increased assessments for real estate taxes and other charges. A portion of our real estate lease portfolio contains base rents subject to annual changes in the Consumer Price Index ("CPI") as well as charges for operating expenses which are reimbursable to the landlord based on actual usage. Changes to the CPI and payments for such reimbursable operating expenses are considered variable and are recognized as variable lease costs in the period in which the obligation for those payments is incurred. Approximately 99% of the Company’s lease obligations are for the use of office space. All of the Company’s material leases are operating leases.

As a practical expedient, the Company elected an accounting policy not to separate non-lease components from lease components and instead account as a single lease component. The Company also elected not to recognize ROU assets and lease liabilities for leases that, at the commencement date, are for 12 months or less.

The following chart provides additional information about the Company’s property leases:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2021		2020		2021		2020
Lease Cost:
Operating lease cost	$	93	$	99	$	282	$	288
Short-term lease cost	1		1		4		3
Variable lease cost	38		28		101		92
Sublease income	(3)		(5)		(16)		(15)
Net lease cost	$	129	$	123	$	371	$	368
Other information:
Operating cash outflows from operating leases					$	310	$	306
Right of use assets obtained in exchange for new operating lease liabilities					$	282	$	162
Weighted-average remaining lease term – real estate					9.0 years		8.4 years
Weighted-average discount rate – real estate leases					2.75%		3.02%

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Future minimum lease payments for the Company’s operating leases as of September 30, 2021 are as follows:

Payment Dates (In millions)	Real Estate Leases
Remainder of 2021	$	102
2022	387
2023	340
2024	298
2025	266
2026	243
Subsequent years	897
Total future lease payments	2,533
Less: Imputed interest	(294)
Total	$	2,239
Current lease liabilities	$	339
Long-term lease liabilities	1,900
Total lease liabilities	$	2,239

Note: Table excludes obligations for leases with original terms of 12 months or less which have not been recognized as a right of use asset or liability in the consolidated balance sheets.

As of September 30, 2021, the Company had additional operating real estate leases that had not yet commenced of $13 million. These operating leases will commence over the next 12 months.

13.    Retirement Benefits

The Company maintains qualified and non-qualified defined benefit pension plans for some of its U.S. and non-U.S. eligible employees. The Company’s policy for funding its tax-qualified defined benefit pension plans is to contribute amounts at least sufficient to meet the funding requirements set forth in accordance with applicable law.

The target asset allocation for the Company's U.S. plans is 64% equities and equity alternatives and 36% fixed income. At September 30, 2021 the actual allocation for the Company's U.S. Plan was 65% equities and equity alternatives and 35% fixed income. The target allocation for the U.K. Plans at September 30, 2021 is 27% equities and equity alternatives and 73% fixed income. At September 30, 2021, the actual allocation for the U.K. Plans was 28% equities and equity alternatives and 72% fixed income. The Company's U.K. Plans comprised approximately 81% of non-U.S. plan assets at December 31, 2020. The assets of the Company's defined benefit plans are diversified and are managed in accordance with applicable laws and with the goal of maximizing the plans' real return within acceptable risk parameters. The Company generally uses threshold-based portfolio re-balancing to ensure the actual portfolio remains consistent with target asset allocation ranges.

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The components of the net periodic benefit cost for defined benefit plans are as follows:

Combined U.S. and significant non-U.S. Plans	Pension Benefits
For the Three Months Ended September 30,
(In millions)	2021		2020
Service cost	$	9	$	10
Interest cost	87		112
Expected return on plan assets	(208)		(212)
Recognized actuarial loss	52		40
Total credit	$	(60)	$	(50)
Combined U.S. and significant non-U.S. Plans	Pension Benefits
For the Nine Months Ended September 30,
(In millions)	2021		2020
Service cost	$	29	$	27
Interest cost	258		322
Expected return on plan assets	(627)		(629)
Recognized actuarial loss	155		120
Net periodic benefit credit	$	(185)	$	(160)
Settlement loss	2		—
Total credit	$	(183)	$	(160)

Amounts Recorded in the Consolidated Statement of Income
Combined U.S. and significant non-U.S. Plans	Pension Benefits
For the Three Months Ended September 30,
(In millions)	2021		2020
Compensation and benefits expense	$	9	$	10
Other net benefit credit	(69)		(60)
Total credit	$	(60)	$	(50)

Amounts Recorded in the Consolidated Statement of Income
Combined U.S. and significant non-U.S. Plans	Pension Benefits
For the Nine Months Ended September 30,
(In millions)	2021		2020
Compensation and benefits expense	$	29	$	27
Other net benefit credit	(212)		(187)
Total credit	$	(183)	$	(160)

U.S. Plans only	Pension Benefits
For the Three Months Ended September 30,
(In millions)	2021		2020
Interest cost	$	47	$	53
Expected return on plan assets	(82)		(86)
Recognized actuarial loss	22		18
Net periodic benefit credit	$	(13)	$	(15)

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U.S. Plans only	Pension Benefits
For the Nine Months Ended September 30,
(In millions)	2021		2020
Interest cost	$	139	$	160
Expected return on plan assets	(245)		(259)
Recognized actuarial loss	67		54
Net periodic benefit credit	$	(39)	$	(45)

Significant non-U.S. Plans only	Pension Benefits
For the Three Months Ended September 30,
(In millions)	2021		2020
Service cost	$	9	$	10
Interest cost	40		59
Expected return on plan assets	(126)		(126)
Recognized actuarial loss	30		22
Total credit	$	(47)	$	(35)

Significant non-U.S. Plans only	Pension Benefits
For the Nine Months Ended September 30,
(In millions)	2021		2020
Service cost	$	29	$	27
Interest cost	119		162
Expected return on plan assets	(382)		(370)
Recognized actuarial loss	88		66
Net periodic benefit credit	$	(146)	$	(115)
Settlement loss	2		—
Total credit	$	(144)	$	(115)

The weighted average actuarial assumptions utilized to calculate the net periodic benefit costs for the U.S. and significant non-U.S. defined benefit plans are as follows:

Combined U.S. and significant non-U.S. Plans	Pension Benefits
September 30,	2021		2020
Weighted average assumptions:
Expected return on plan assets	4.72	%	5.31	%
Discount rate	1.92	%	2.57	%
Rate of compensation increase	1.85	%	1.76	%

The Company made approximately $90 million of contributions to its U.S. and non-U.S. defined benefit pension plans for the nine months ended September 30, 2021. The Company expects to contribute approximately $39 million to its U.S. and non-U.S. defined benefit pension plans during the remainder of 2021.

Defined Contribution Plans

The Company maintains certain defined contribution plans ("DC Plans") for its employees, the most significant being in the U.S. and the U.K. The cost of the U.S. DC Plans was $115 million and $110 million for the nine months ended September 30, 2021 and 2020, respectively. The cost of the U.K. DC Plans was $106 million and $94 million for the nine months ended September 30, 2021 and 2020, respectively.

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14.    Debt

The Company’s outstanding debt is as follows:

(In millions)	September 30, 2021		December 31, 2020
Short-term:
Current portion of long-term debt	$	516	$	517
	516		517
Long-term:
Senior notes – 4.80% due 2021	—		500
Senior notes – 2.75% due 2022	500		499
Senior notes – 3.30% due 2023	349		349
Senior notes – 4.05% due 2023	249		249
Senior notes – 3.50% due 2024	598		598
Senior notes – 3.875% due 2024	996		995
Senior notes – 3.50% due 2025	498		498
Senior notes – 1.349% due 2026	647		677
Senior notes – 3.75% due 2026	598		597
Senior notes – 4.375% due 2029	1,499		1,499
Senior notes – 1.979% due 2030	632		664
Senior notes – 2.250% due 2030	738		737
Senior notes – 5.875% due 2033	298		298
Senior notes – 4.75% due 2039	495		495
Senior notes – 4.35% due 2047	493		493
Senior notes – 4.20% due 2048	592		592
Senior notes – 4.90% due 2049	1,238		1,237
Mortgage – 5.70% due 2035	320		331
Other	4		5
	10,744		11,313
Less current portion	516		517
	$	10,228	$	10,796

The senior notes in the table are registered by the Company with the Securities and Exchange Commission and are not guaranteed.

On April 9, 2021, the Company increased its short-term commercial paper financing program to $2.0 billion from $1.5 billion. The Company had no commercial paper outstanding at September 30, 2021.

Credit Facilities

On April 2, 2021, the Company entered into an amended and restated multi-currency unsecured $2.8 billion five-year revolving credit facility ("New Facility"). The interest rate on the New Facility is based on LIBOR plus a fixed margin which varies with the Company’s credit ratings. The New Facility expires in April 2026 and requires the Company to maintain certain coverage and leverage ratios which are tested quarterly. The New Facility includes provisions for determining a LIBOR successor rate in the event LIBOR reference rates are no longer available or in certain other circumstances which are determined to make using an alternative rate desirable. As of September 30, 2021, the Company had no borrowings under this facility.

In connection with the New Facility, the Company terminated its previous multi-currency unsecured $1.8 billion five-year revolving credit facility and its unsecured $1 billion 364-day unsecured revolving credit facility ("364-day Facility").

In January 2020, the Company closed on a $500 million one-year and $500 million two-year term loan facilities. In the first quarter of 2020 the Company borrowed $1 billion against these facilities, which were subsequently repaid during the third and fourth quarters of 2020. These two facilities were terminated as of December 31, 2020 after repayment of the initial draw down.

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Additional credit facilities, guarantees and letters of credit are maintained with various banks, primarily related to operations located outside the United States, aggregating $512 million at September 30, 2021 and $573 million at December 31, 2020. There were no outstanding borrowings under these facilities at September 30, 2021 and December 31, 2020.

Senior Notes

On April 15, 2021, the Company repaid $500 million of senior notes maturing in July 2021.

In May 2020, the Company issued $750 million of senior notes due 2030.

In March 2020, the Company repaid $500 million of maturing senior notes.

Fair Value of Short-term and Long-term Debt

The following table reflects the carrying values and estimated fair value of the Company’s short-term and long-term debt. Certain estimates and judgments were required to develop the fair value amounts. The fair value amounts are not necessarily indicative of the amounts that the Company would realize upon disposition, nor do they indicate the Company’s intent or need to dispose of the financial instrument.

	September 30, 2021				December 31, 2020
(In millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Short-term debt	$	516	$	519	$	517	$	523
Long-term debt	$	10,228	$	11,878	$	10,796	$	12,858

The fair value of the Company's short-term debt consists primarily of term debt maturing within the next year and its fair value approximates its carrying value. The estimated fair value of the Company's long-term debt is based on discounted future cash flows using current interest rates available for debt with similar terms and remaining maturities. Short-term and long-term debt would be classified as Level 2 in the fair value hierarchy.

15.    Restructuring Costs

Jardine Lloyd Thompson Group plc ("JLT") Related Integration and Restructuring

The Company is in the final stages of its integration of JLT, which the Company acquired in April 2019. The costs incurred in connection with the integration and restructuring of the combined businesses, primarily related to severance, real estate rationalization and technology, consulting fees related to the management of the integration processes and legal fees related to the rationalization of legal entity structures.

Since the acquisition of JLT, the Company has incurred JLT integration and restructuring costs of $647 million through September 30, 2021. This reflects $19 million and $61 million of costs incurred for the three and nine months ended September 30, 2021, respectively, compared to $44 million and $181 million, respectively, for the same periods in the prior year.

Costs recognized are based on applicable accounting guidance which includes accounting for disposal or exit activities, guidance related to impairment of long lived assets (for right of use assets related to real estate leases), as well as other costs resulting from accelerated depreciation or amortization of leasehold improvements and other property and equipment.

In connection with the JLT integration and restructuring, the Company incurred costs of $19 million and $61 million: $11 million and $38 million in RIS and $9 million and $21 million in Consulting for the three and nine months ended September 30, 2021, respectively. The severance and related costs were included in compensation and benefits and the other costs were included in other operating expenses in the consolidated statements of income.

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Details of the JLT integration and restructuring activity from January 1, 2020 through September 30, 2021, are as follows:

(In millions)	Severance		Real Estate Related Costs (a)		Information Technology (a)		Consulting and Other Outside Services (b)		Total
Liability at 1/1/20	$	42	$	5	$	—	$	—	$	47
2020 charges	43		69		62		77		251
Cash payments	(69)		(25)		(55)		(77)		(226)
Non-cash charges	—		(42)		(5)		—		(47)
Liability at 12/31/20	$	16	$	7	$	2	$	—	$	25
2021 charges	9		19		15		18		61
Cash payments	(15)		(9)		(16)		(18)		(58)
Non-cash charges	—		(13)		—		—		(13)
Liability at 9/30/21	$	10	$	4	$	1	$	—	$	15

(a) Includes ROU asset impairments, data center contract termination costs and temporary infrastructure leasing costs.

(b) Includes consulting fees related to the management of the integration processes and legal fees related to the rationalization of legal entity structures.

Other Restructuring

The Company incurred costs of $12 million and $35 million for the three and nine months ended September 30, 2021 which reflect costs associated with the Company's global information technology and HR functions, and adjustments to restructuring liabilities for future rent under non-cancellable leases.

The following details other restructuring liabilities for actions initiated prior to 2021:

(In millions)	Liability at 1/1/20		Amounts Accrued		Cash Paid		Non-Cash/Other		Liability at 12/31/20		Amounts Accrued		Cash Paid		Non-Cash/Other		Liability at 9/30/21
Severance	$	51	$	39	$	(54)	$	—	$	36	$	13	$	(35)	$	—	$	14
Future rent under non-cancelable leases and other costs	51		50		(46)		(10)		45		22		(31)		(4)		32
Total	$	102	$	89	$	(100)	$	(10)	$	81	$	35	$	(66)	$	(4)	$	46

The expenses associated with these initiatives are included in compensation and benefits and other operating expenses in the consolidated statements of income. The liabilities associated with these initiatives are classified on the consolidated balance sheets as accounts payable and accrued liabilities, other liabilities or accrued compensation and employee benefits, depending on the nature of the items.

16.    Common Stock

In November 2019, the Board of Directors of the Company authorized the Company to repurchase up to $2.5 billion in shares of the Company's common stock, which superseded any prior authorizations. During the first nine months of 2021, the Company repurchased 5.3 million shares of its common stock for $734 million. As of September 30, 2021, the Company remained authorized to repurchase up to approximately $1.7 billion in shares of its common stock. There is no time limit on the authorization. During the first nine months of 2020, there were no repurchases of the Company's common stock.

The Company issued approximately 3.1 million and 3.4 million shares related to stock compensation and employee stock purchase plans during the first nine months of 2021 and 2020, respectively.

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17.    Claims, Lawsuits and Other Contingencies

Nature of Contingencies

The Company and its subsidiaries are subject to a significant number of claims, lawsuits and proceedings in the course of our business. Such claims and lawsuits consist principally of alleged errors and omissions in connection with the performance of professional services, including the placement of insurance, the provision of actuarial services for corporate and public sector clients, the provision of investment advice and investment management services to pension plans, the provision of advice relating to pension buy-out transactions and the provision of consulting services relating to the drafting and interpretation of trust deeds and other documentation governing pension plans. These claims often seek damages, including punitive and treble damages, in amounts that could be significant. In establishing liabilities for errors and omissions claims in accordance with FASB guidance on Contingencies - Loss Contingencies, the Company uses case level reviews by inside and outside counsel, and internal actuarial analysis by Oliver Wyman, a subsidiary of the Company, and other methods to estimate potential losses. A liability is established when a loss is both probable and reasonably estimable. The liability is reviewed quarterly and adjusted as developments warrant. In many cases, the Company has not recorded a liability, other than for legal fees to defend the claim, because we are unable, at the present time, to make a determination that a loss is both probable and reasonably estimable. To the extent that expected losses exceed our deductible in any policy year, the Company also records an asset for the amount that we expect to recover under any available third-party insurance programs. The Company has varying levels of third-party insurance coverage, with policy limits and coverage terms varying significantly by policy year.

Our activities are regulated under the laws of the United States and its various states, the United Kingdom, the European Union and its member states, and the many other jurisdictions in which the Company operates. 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.

Current Matters

Risk and Insurance Services Segment

•In January 2019, the Company received a notice that the Administrative Council for Economic Defense anti-trust agency in Brazil had commenced an administrative proceeding against a number of insurance brokers, including both Marsh and JLT, and insurers “to investigate an alleged sharing of sensitive commercial and competitive confidential information" in the aviation insurance and reinsurance sector.

•In 2017, JLT identified payments to a third-party introducer that had been directed to unapproved bank accounts. These payments related to reinsurance placements made on behalf of an Ecuadorian state-owned insurer between 2014 and 2017. In early 2018, JLT voluntarily reported this matter to law enforcement authorities. In February and March 2020, money laundering charges were filed in the United States against a former employee of JLT, the principals of the third-party introducer and a former official of the state-owned insurer. These individuals, including the former JLT employee, have since pleaded guilty to criminal charges. We are cooperating with all ongoing investigations related to this matter.

•From 2014, Marsh Ltd. was engaged by Greensill Capital (UK) Limited as its insurance broker. Marsh Ltd. placed a number of trade credit insurance policies for Greensill. On March 1, 2021, Greensill filed an action against certain of its trade credit insurers in Australia seeking a mandatory injunction compelling these insurers to renew coverage under expiring policies. Later that day, the Australian court denied Greensill’s application. Since then, a number of Greensill entities have filed for, or been subject to, insolvency proceedings, and several litigations and investigations have been commenced in the U.K., Australia, Germany, Switzerland and the U.S.

Consulting Segment

•In 2014, the FCA conducted an industry-wide review of the suitability of financial advice provided to individuals by a number of companies, including JLT, relating to enhanced transfer value ("ETV") defined benefit pension transfers. In January 2015, the FCA notified JLT that it was commissioning a Skilled Person review of ETV pension transfer advice given by JLT and a business acquired by JLT in 2012. Following the Skilled Person review which took place between 2015 and 2018, JLT engaged a compliance consulting firm to conduct an analysis of approximately 14,000 individual files to assess the suitability of the advice provided and, where appropriate, the amount of redress to be paid. In February 2019, prior to the completion of its acquisition by the Company, JLT recorded a gross liability of £59 million (or $77 million). This preliminary estimate by JLT, which reflected the projected redress amounts contained in the Skilled Person report, was based on a review of a limited number of files. Thereafter, the FCA expanded the scope

31

of the review. As of December 31, 2020, the updated redress liability, including the projected costs of completing the review, increased to £155 million (or $210 million) resulting from the expansion in the scope of the review, and the significant progress made in completing the individual suitability reviews. Payments of redress and expenses during the first three quarters of 2021, together with a reduction of the actuarial estimates of future redress payments, reduced the recorded liability to £25 million (or $34 million) as of September 30, 2021. We expect to finalize the suitability review and redress calculations and to make substantially all redress payments by the end of the fourth quarter of 2021. This gross liability has been, and we anticipate will continue to be, partially offset by a contractual indemnity obligation and insurance recoveries from third-party E&O insurers.

At this time, we are unable to predict the likely timing, outcome or ultimate impact of the foregoing matters. Adverse determinations in one or more of these matters could have a material impact on the Company's consolidated results of operations, financial condition or cash flows in a future period.

Other Contingencies-Guarantees

In connection with its acquisition of U.K.-based Sedgwick Group in 1998, the Company acquired several insurance underwriting businesses that were already in run-off, including River Thames Insurance Company Limited ("River Thames"), which the Company sold in 2001. Sedgwick guaranteed payment of claims on certain policies underwritten through the Institute of London Underwriters (the "ILU") by River Thames. The policies covered by this guarantee are partly reinsured by a related party of River Thames. Payment of claims under the reinsurance agreement is collateralized by funds withheld by River Thames from the reinsurer. To the extent River Thames or the reinsurer is unable to meet its obligations under those policies, a claimant may seek to recover from the Company under the guarantee.

From 1980 to 1983, the Company owned indirectly the English & American Insurance Company ("E&A"), which was a member of the ILU. The ILU required the Company to guarantee a portion of E&A's obligations. After E&A became insolvent in 1993, the ILU agreed to discharge the guarantee in exchange for the Company's agreement to post an evergreen letter of credit that is available to pay claims by policyholders on certain E&A policies issued through the ILU and incepting between July 3, 1980 and October 6, 1983. Certain claims have been paid under the letter of credit and the Company anticipates that additional claimants may seek to recover against the letter of credit.

* * * *

The pending proceedings described above and other matters not explicitly described in this Note 17 on Claims, Lawsuits and Other Contingencies may expose the Company or its subsidiaries to liability for significant monetary damages, fines, penalties or other forms of relief. Where a loss is both probable and reasonably estimable, the Company establishes liabilities in accordance with FASB guidance on Contingencies - Loss Contingencies. Except as described above, the Company is not able at this time to provide a reasonable estimate of the range of possible loss attributable to these matters or the impact they may have on the Company's consolidated results of operations, financial position or cash flows. This is primarily because these matters are still developing and involve complex issues subject to inherent uncertainty. Adverse determinations in one or more of these matters could have a material impact on the Company's consolidated results of operations, financial condition or cash flows in a future period.

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18.    Segment Information

The Company is organized based on the types of services provided. Under this structure, the Company’s segments are:

•Risk and Insurance Services, comprising insurance services (Marsh) and reinsurance services (Guy Carpenter); and

•Consulting, comprising Mercer and Oliver Wyman Group.

The accounting policies of the segments are the same as those used for the consolidated financial statements described in Note 1 to the Company’s 2020 Form 10-K. Segment performance is evaluated based on segment operating income, which includes directly related expenses, and charges or credits related to integration and restructuring but not the Company’s corporate-level expenses. Revenues are attributed to geographic areas on the basis of where the services are performed.

Selected information about the Company’s operating segments for the three and nine month periods ended September 30, 2021 and 2020 are as follows:

	Three Months Ended September 30,					Nine Months Ended September 30,
(In millions)	Revenue			Operating Income (Loss)		Revenue			Operating Income (Loss)
2021–
Risk and Insurance Services	$	2,670	(a)	$	403	$	9,036	(c)	$	2,413
Consulting	1,925		(b)	404		5,690		(d)	1,109
Total Operating Segments	4,595			807		14,726			3,522
Corporate/Eliminations	(12)			(67)		(43)			(196)
Total Consolidated	$	4,583		$	740	$	14,683		$	3,326
2020–
Risk and Insurance Services	$	2,291	(a)	$	333	$	7,805	(c)	$	1,883
Consulting	1,696		(b)	278		5,074		(d)	815
Total Operating Segments	3,987			611		12,879			2,698
Corporate/Eliminations	(19)			(71)		(71)			(203)
Total Consolidated	$	3,968		$	540	$	12,808		$	2,495

(a) Includes interest income on fiduciary funds of $4 million and $8 million in 2021 and 2020, respectively, and equity method income of $8 million in 2021 and equity method loss of $6 million in 2020.

(b) Includes inter-segment revenue of $11 million and $19 million in 2021 and 2020, respectively.

(c) Includes inter-segment revenue of $5 million for both 2021 and 2020, interest income on fiduciary funds of $12 million and $40 million in 2021 and 2020, respectively, and equity method income of $25 million and $7 million in 2021 and 2020, respectively.

(d) Includes inter-segment revenue of $38 million and $66 million in 2021 and 2020, respectively, and equity method income of $4 million in 2020 and none in 2021.

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Details of operating segment revenue for the three and nine month periods ended September 30, 2021 and 2020 are as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2021		2020		2021		2020
Risk and Insurance Services
Marsh	$	2,355	$	2,015	$	7,336	$	6,259
Guy Carpenter	315		276		1,700		1,546
Total Risk and Insurance Services	2,670		2,291		9,036		7,805
Consulting
Mercer	1,315		1,216		3,877		3,616
Oliver Wyman Group	610		480		1,813		1,458
Total Consulting	1,925		1,696		5,690		5,074
Total Operating Segments	4,595		3,987		14,726		12,879
Corporate/Eliminations	(12)		(19)		(43)		(71)
Total	$	4,583	$	3,968	$	14,683	$	12,808

19.    New Accounting Guidance

New Accounting Pronouncements Adopted Effective January 1, 2021:

In January 2020, the FASB issued guidance that addresses accounting for the transition into and out of the equity method and measuring certain purchased options and forward contracts to acquire investments. The standard takes effect for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. The adoption of this standard did not have a material impact on the Company’s financial position or its results of operations.

In December 2019, the FASB issued guidance related to the accounting for income taxes. The standard removes specific exceptions in the current rules and eliminates the need for an organization to analyze whether the following apply in a given period: (a) exception to the incremental approach for intraperiod tax allocation; (b) exceptions to accounting for basis differences when there are ownership changes in foreign investments and (c) exception in interim period income tax accounting for year-to-date losses that exceed anticipated losses. The standard also is designed to improve financial statement preparers’ application of income tax-related guidance and simplify GAAP for (a) franchise taxes that are partially based on income; (b) transactions with a government that result in a step-up in the tax basis of goodwill; (c) separate financial statements of legal entities that are not subject to tax and (d) enacted changes in tax laws in interim periods. The standard takes effect for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. The adoption of this standard did not have a material impact on the Company’s financial position or its results of operations.

New Accounting Pronouncements Adopted Effective January 1, 2020:

In August 2018, the FASB issued new guidance that amends required fair value measurement disclosures. The guidance adds new requirements, eliminates some current disclosures and modifies other required disclosures. The new disclosure requirements, along with modifications made to disclosures as a result of the change in requirements for narrative descriptions of measurement uncertainty, must be applied on a prospective basis. The effects of all other amendments included in the guidance must be applied retrospectively for all periods presented. The adoption of this guidance impacted disclosures only and did not have an impact on the Company's financial position or results of operations.

In January 2017, the FASB issued new guidance to simplify the test for goodwill impairment. The new guidance eliminates the second step in the current two-step goodwill impairment process, under which a goodwill impairment loss is measured by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill for that reporting unit. The new guidance requires a one-step impairment test, in which the goodwill impairment charge is based on the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The guidance should be applied on a prospective basis with the nature of and reason

34

for the change in accounting principle disclosed upon transition. The adoption of this standard did not have an impact on the Company's financial position or results of operations.

In June 2016, the FASB issued new guidance on the impairment of financial instruments. The new guidance adds an allowance for credit losses ("CECL") impairment model that is based on expected losses rather than incurred losses. Under the new guidance, an entity recognizes as an allowance its estimate of lifetime expected credit losses, which the FASB believes will result in more timely recognition of such losses. The new standard is also intended to reduce the complexity of U.S. GAAP by decreasing the number of credit impairment models that entities use to account for debt instruments. Further, the new standard makes targeted changes to the impairment model for available-for-sale debt securities. The adoption of this standard did not have a material impact on the Company’s financial position or results of operations.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

General

Marsh & McLennan Companies, Inc. and its consolidated subsidiaries (the "Company" or "Marsh McLennan") is a global professional services firm offering clients advice in the areas of risk, strategy and people. The Company’s 81,000 colleagues advise clients in 130 countries. With annual revenue over $19 billion, the Company helps clients navigate an increasingly dynamic and complex environment through four market-leading businesses. Marsh advises individual and commercial clients of all sizes on insurance broking and innovative risk management solutions. Guy Carpenter develops advanced risk, reinsurance and capital strategies that help clients grow profitably and pursue emerging opportunities. Mercer delivers advice and technology-driven solutions that help organizations redefine the world of work, reshape retirement and investment outcomes, and unlock health and well being for a changing workforce. Oliver Wyman Group serves as a critical strategic, economic and brand advisor to private sector and governmental clients.

The Company conducts business through two segments:

•Risk and Insurance Services includes risk management activities (risk advice, risk transfer and risk control and mitigation solutions) as well as insurance and reinsurance broking and services. The Company conducts business in this segment through Marsh and Guy Carpenter.

•Consulting includes health, wealth and career consulting services and products, and specialized management, economic and brand consulting services. The Company conducts business in this segment through Mercer and Oliver Wyman Group.

A reconciliation of segment operating income to total operating income is included in Note 18 to the consolidated financial statements included in Part I Item 1 in this report. The accounting policies used for each segment are the same as those used for the consolidated financial statements.

For information on the three and nine months ended September 30, 2020 results and similar comparisons, see "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations" of our Form 10-Q for the quarter ended September 30, 2020.

Business Update Related To COVID-19

The World Health Organization declared COVID-19 a pandemic in March 2020. The pandemic has impacted businesses globally including virtually every geography in which the Company operates. Governments continue to ease restrictions or fully reopen their economies, as the various vaccines are effective in mitigating the effects of the virus. Our businesses have been resilient throughout the pandemic and demand for our advice and services remains strong as the global economic conditions improve.

Although the vast majority of colleagues continue to work in a remote environment, the Company has provided guidelines on a gradual and phased return to the office depending on the level of virus containment and local health and safety regulations in each geography. The safety and well-being of our colleagues is paramount and the Company expects to continue to service clients effectively in the current remote environment and as colleagues gradually return to the office.

The Company had strong revenue growth through the first nine months of 2021 and benefited from the continued recovery of the global economy. However, uncertainty remains in the economic outlook and the ultimate extent of COVID-19 impact to the Company will depend on future developments that it is unable to predict, including new “waves” of infection from emerging variants of the virus, potential renewed restrictions and mandates by various governments or agencies, and the distribution and uptake of vaccines.

Factors that could adversely affect the Company’s financial statements related to the financial and operational impact of COVID-19 are outlined in “Item 1A - Risk Factors” in the Company’s Form 10-K for the year ended December 31, 2020.

Acquisitions and dispositions impacting the Risk and Insurance Services and Consulting segments are discussed in Note 8 to the consolidated financial statements.

This Management's Discussion & Analysis ("MD&A") contains forward-looking statements as that term is defined in the Private Securities Litigation Reform Act of 1995. See "Information Concerning Forward-Looking Statements" at the outset of this report.

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Consolidated Results of Operations

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions, except per share data)	2021		2020		2021		2020
Revenue	$	4,583	$	3,968	$	14,683	$	12,808
Expense:
Compensation and benefits	2,853		2,495		8,520		7,479
Other operating expenses	990		933		2,837		2,834
Operating expenses	3,843		3,428		11,357		10,313
Operating income	740		540		3,326		2,495
Income before income taxes	716		459		3,247		2,253
Net income before non-controlling interests	542		320		2,367		1,667
Net income attributable to the Company	$	537	$	316	$	2,340	$	1,642
Net Income per share attributable to the Company:
Basic	$	1.06	$	0.62	$	4.61	$	3.25
Diluted	$	1.05	$	0.62	$	4.56	$	3.21
Average number of shares outstanding:
Basic	506		507		508		506
Diluted	513		512		513		511
Shares outstanding at September 30,	505		507		505		507

Risk and Insurance Services

The following reflects the results of operations for the Risk and Insurance Services segment:

For the Three and Nine Months Ended September 30,	Three Months				Nine Months
(In millions)	2021		2020		2021		2020
Revenue	$	2,670	$	2,291	$	9,036	$	7,805
Compensation and benefits	1,634		1,400		4,876		4,234
Other operating expenses	633		558		1,747		1,688
Expense	2,267		1,958		6,623		5,922
Operating income	$	403	$	333	$	2,413	$	1,883
Operating income margin	15.1%		14.5%		26.7%		24.1%

Consulting

The following reflects the results of operations for the Consulting segment:

For the Three and Nine Months Ended September 30,	Three Months				Nine Months
(In millions)	2021		2020		2021		2020
Revenue	$	1,925	$	1,696	$	5,690	$	5,074
Compensation and benefits	1,103		980		3,287		2,911
Other operating expenses	418		438		1,294		1,348
Expense	1,521		1,418		4,581		4,259
Operating income	$	404	$	278	$	1,109	$	815
Operating income margin	21.0%		16.4%		19.5%		16.1%

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Consolidated operating income increased $200 million, or 37% to $740 million for the three months ended September 30, 2021 compared to $540 million for the three months ended September 30, 2020, reflecting a 16% increase in revenue and 12% increase in expense. The revenue growth was driven by increases in the Risk and Insurance Services and Consulting segments of 17% and 13%, respectively. There continues to be high demand for our advice and services as the U.S. and global economies continue to rebound from the impact of the pandemic. The increase in expense is primarily related to higher incentive compensation and increase in base salaries for additional headcount.

Consolidated operating income increased $831 million, or 33% to $3.3 billion for the nine months ended September 30, 2021 compared to $2.5 billion for the nine months ended September 30, 2020, reflecting a 15% increase in revenue and 10% increase in expense. The revenue growth was driven by increases in the Risk and Insurance Services and Consulting segments of 16% and 12%, respectively. The increase in revenue and expense for the nine months ended September 30, 2021 is due to the same factors as previously discussed for the third quarter. The Company also incurred lower Jardine Lloyd Thompson ("JLT") integration and restructuring costs in 2021 compared to 2020.

Diluted earnings per share increased 69% to $1.05 for the three months ended September 30, 2021 compared to $0.62 for the three months ended September 30, 2020 and 42% to $4.56 for the nine months ended September 30, 2021 compared to $3.21 for the nine months ended September 30, 2020. The increase for the three and nine months ended September 30, 2021 is a result of higher operating income, lower interest expense and higher investment gains in 2021 compared to 2020. The nine months ended September 30, 2021 also included a net charge of approximately $100 million related to the remeasurement of deferred tax assets and liabilities due to the enactment of a tax rate increase from 19% to 25% in the U.K. in the second quarter of 2021.

The Company’s results of operations and earnings per share for the three and nine months ended September 30, 2021 and 2020 include costs related to JLT integration and restructuring activities, and other restructuring activities as discussed in more detail in Note 15 of the consolidated financial statements.

The following chart provides a summary of costs that are reflected as part of net operating income:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2021		2020		2021		2020
Restructuring costs, excluding JLT	$	12	$	23	$	35	$	43
JLT integration and restructuring costs	19		44		61		181
JLT acquisition related costs	11		15		35		41
JLT legacy E&O provision	(63)		—		(63)		—
Legal claims and other	22		—		29		—
Net (gain) loss on sale of businesses	—		—		(49)		2
Impact on operating income	$	1	$	82	$	48	$	267

JLT Integration and Restructuring Costs

The Company is in the final stages of its integration of JLT. The costs incurred in connection with the integration and restructuring of the combined businesses are primarily related to severance, real estate rationalization and technology, consulting fees related to the management of the integration processes and legal fees related to the rationalization of legal entity structures. Since the acquisition of JLT, the Company has incurred JLT integration and restructuring costs of $647 million through September 30, 2021. This reflects $61 million of costs incurred during the first nine months of 2021 compared to $181 million for the same period in the prior year. The Company expects to incur the remaining $77 million of costs substantially in 2021, primarily related to real estate and technology, of which approximately $69 million will be cash expenditures. Through September 30, 2021, the Company has exceeded the initial estimated savings of $350 million and has realized at least $425 million of annualized savings.

JLT Acquisition Related Costs

JLT acquisition related costs reflect retention costs related to the acquisition of JLT.

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JLT Legacy E&O Provision

In the third quarter of 2021, the Company recorded a $36 million reduction in the liability for a legacy JLT Errors and Omissions ("E&O") related to the suitability of advice provided to individuals for defined benefit pension transfers in the UK, as well as $27 million of recoveries under indemnities and insurance. The reduction in liability primarily reflects lower redress payments than previously estimated, partly offset by higher costs to review and calculate redress. See Note 17 ("Claims, Lawsuits and Other Contingencies") to the consolidated financial statements in this report for additional detail.

Legal claims and other

The Company recorded settlement charges and legal costs related to strategic recruiting.

Net (gain) loss on sale of business

During the first nine months of 2021, the Company sold certain businesses in the U.S. and the U.K. and recognized a net gain of approximately $50 million, primarily related to the commercial networks business in the U.K. that provided broking and back-office solutions for small independent brokers.

Revenue

The Company conducts business in 130 countries. As a result, foreign exchange rate movements may impact period-to-period comparisons of revenue. Similarly, certain other items such as acquisitions and dispositions, including transfers among businesses, may impact period-to-period comparisons of revenue. Underlying revenue measures the change in revenue from one period to the next by isolating these impacts.

The impact of foreign currency exchange fluctuations, acquisitions and dispositions, including transfers among businesses, on the Company’s operating revenues by segment are as follows:

39

	Three Months Ended September 30,				% Change GAAP Revenue		Components of Revenue Change*
							Currency Impact		Acquisitions/ Dispositions/ Other Impact		Underlying Revenue
(In millions, except percentage data)	2021		2020
Risk and Insurance Services
Marsh	$	2,352	$	2,009	17	%	2	%	3	%	13	%
Guy Carpenter	314		274		15	%	—		—		15	%
Subtotal	2,666		2,283		17	%	1	%	2	%	13	%
Fiduciary interest income	4		8
Total Risk and Insurance Services	2,670		2,291		17	%	1	%	2	%	13	%
Consulting
Mercer	1,315		1,216		8	%	2	%	(1)	%	7	%
Oliver Wyman Group	610		480		27	%	1	%	—		25	%
Total Consulting	1,925		1,696		13	%	2	%	—		12	%
Corporate Eliminations	(12)		(19)
Total Revenue	$	4,583	$	3,968	16	%	2	%	1	%	13	%

	Three Months Ended September 30,				% Change GAAP Revenue		Components of Revenue Change*
							Currency Impact		Acquisitions/ Dispositions/ Other Impact		Underlying Revenue
(In millions, except percentage data)	2021		2020
Marsh:
EMEA	$	600	$	536	12	%	4	%	—		8	%
Asia Pacific	281		254		10	%	2	%	—		9	%
Latin America	105		93		13	%	1	%	—		12	%
Total International	986		883		12	%	3	%	—		9	%
U.S./Canada	1,366		1,126		21	%	—		4	%	16	%
Total Marsh	$	2,352	$	2,009	17	%	2	%	3	%	13	%
Mercer:
Wealth	$	613	$	566	9	%	3	%	(1)	%	6	%
Health	449		430		4	%	1	%	(1)	%	4	%
Career	253		220		15	%	1	%	—		13	%
Total Mercer	$	1,315	$	1,216	8	%	2	%	(1)	%	7	%

* Components of revenue change may not add due to rounding.

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	Nine Months Ended September 30,				% Change GAAP Revenue		Components of Revenue Change*
							Currency Impact		Acquisitions/ Dispositions/ Other Impact		Underlying Revenue
(In millions, except percentage data)	2021		2020
Risk and Insurance Services
Marsh	$	7,327	$	6,231	18	%	3	%	3	%	12	%
Guy Carpenter	1,697		1,534		11	%	1	%	—		10	%
Subtotal	9,024		7,765		16	%	3	%	2	%	11	%
Fiduciary interest income	12		40
Total Risk and Insurance Services	9,036		7,805		16	%	3	%	2	%	11	%
Consulting
Mercer	3,877		3,616		7	%	4	%	(1)	%	4	%
Oliver Wyman Group	1,813		1,458		24	%	3	%	—		21	%
Total Consulting	5,690		5,074		12	%	4	%	(1)	%	9	%
Corporate Eliminations	(43)		(71)
Total Revenue	$	14,683	$	12,808	15	%	3	%	1	%	10	%

	Nine Months Ended September 30,				% Change GAAP Revenue		Components of Revenue Change*
							Currency Impact		Acquisitions/ Dispositions/ Other Impact		Underlying Revenue
(In millions, except percentage data)	2021		2020
Marsh:
EMEA	$	2,233	$	1,887	18	%	6	%	2	%	10	%
Asia Pacific	902		790		14	%	6	%	—		9	%
Latin America	298		283		5	%	(1)	%	—		6	%
Total International	3,433		2,960		16	%	5	%	1	%	9	%
U.S./Canada	3,894		3,271		19	%	1	%	5	%	14	%
Total Marsh	$	7,327	$	6,231	18	%	3	%	3	%	12	%
Mercer:
Wealth	$	1,861	$	1,719	8	%	6	%	(1)	%	4	%
Health	1,398		1,348		4	%	2	%	(1)	%	3	%
Career	618		549		13	%	3	%	—		10	%
Total Mercer	$	3,877	$	3,616	7	%	4	%	(1)	%	4	%

* Components of revenue change may not add due to rounding.

Consolidated revenue increased $615 million, or 16% to $4.6 billion for the three months ended September 30, 2021 compared to $4.0 billion for the three months ended September 30, 2020. Consolidated revenue increased 13% on an underlying basis, 2% from the impact of foreign currency translation and 1% from acquisitions. On an underlying basis, revenue increased 13% and 12% for the three months ended September 30, 2021 in Risk and Insurance Services and Consulting segments, respectively.

Consolidated revenue increased $1.9 billion, or 15% to $14.7 billion for the nine months ended September 30, 2021 compared to $12.8 billion for the nine months ended September 30, 2020. This reflects increases of 10% on an underlying basis, 3% from the impact of foreign currency translation and 1% from acquisitions. On an underlying basis, revenue increased 11% and 9% for the nine months ended September 30, 2021 in Risk and Insurance Services and Consulting segments, respectively.

Underlying revenue growth in the Risk and Insurance and Consulting segments for the three and nine months ended September 30, 2021 was driven by the high demand for our advice and services as the U.S. and global economies continue to rebound from the impact of the pandemic.

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Risk and Insurance Services

Revenue in the Risk and Insurance Services segment increased $379 million, or 17% to $2.7 billion for the three months ended September 30, 2021 compared to $2.3 billion for the three months ended September 30, 2020. This reflects increases of 13% on an underlying basis, 1% from the impact of foreign currency translation and 2% from acquisitions.

Revenue in the Risk and Insurance Services segment increased $1.2 billion, or 16% to $9.0 billion for the nine months ended September 30, 2021 compared to $7.8 billion for the nine months ended September 30, 2020. This reflects increases of 11% in underlying revenue, 3% from the impact of foreign currency translation and 2% from acquisitions. The increase in underlying revenue in the Risk and Insurance Services segment for the three and nine months ended September 30, 2021, was primarily due to strong growth in new business, solid retention, and benefits from pricing in the marketplace.

At Marsh, revenue increased $343 million, or 17% to $2.4 billion for the third quarter of 2021 compared to $2.0 billion for the third quarter of 2020. This reflects an increase in underlying revenue of 13%, a 2% increase from the impact of foreign exchange translation, and a 3% increase from acquisitions. For Marsh, in U.S./Canada, underlying revenue rose 16%. International operations produced underlying revenue growth of 9%, reflecting growth of 9% in Asia Pacific, 8% in EMEA and 12% in Latin America.

At Marsh, revenue increased $1.1 billion, or 18% to $7.3 billion for the nine months ended September 30, 2021 compared to $6.2 billion for the nine months ended September 30, 2020. This reflects an increase in underlying revenue of 12%, a 3% increase from the impact of foreign exchange translation, and a 3% increase from acquisitions. In U.S./Canada, underlying revenue rose 14%. International operations produced underlying revenue growth of 9%, reflecting growth of 9% in Asia Pacific, 10% in EMEA and 6% in Latin America.

At Guy Carpenter, revenue increased $40 million, or 15% to $314 million for the three months ended September 30, 2021, compared to $274 million for the three months ended September 30, 2020, on both a reported and underlying basis.

At Guy Carpenter, revenue increased $163 million, or 11% to $1.7 billion for the nine months ended September 30, 2021 compared to $1.5 billion for the nine months ended September 30, 2020.

Consulting

Consulting revenue increased $229 million, or 13% to $1.9 billion for the three months ended September 30, 2021 compared to $1.7 billion for the three months ended September 30, 2020. This reflects increases of 12% in underlying revenue and 2% from the impact of foreign currency translation.

Consulting revenue increased $616 million, or 12% to $5.7 billion for the nine months ended September 30, 2021, compared to $5.1 billion for the nine months ended September 30, 2020. This reflects increases of 9% in underlying revenue and 4% from the impact of foreign currency translation offset by a decrease of 1% from the disposition of businesses.

Mercer's revenue increased $99 million, or 8% to $1.3 billion for the three months ended September 30, 2021 compared to $1.2 billion for the three months ended September 30, 2020, or 7% on an underlying basis. Revenue also reflects an increase of 2% from the impact of foreign currency translation offset by a 1% decrease from dispositions. On an underlying basis, revenue for Health and Wealth increased 4% and 6% respectively, while Career increased 13% as compared to the same period last year.

Mercer's revenue increased $261 million, or 7% to $3.9 billion for the nine months ended September 30, 2021 compared to $3.6 billion for the nine months ended September 30, 2020. This reflects an increase of 4% from the impact of foreign currency translation and 4% in underlying revenue, offset by a 1% decrease from dispositions. On an underlying basis, revenue in Health and Wealth increased 3% and 4%, respectively, while Career increased 10% as compared to prior year. The increase in underlying revenue at Mercer for the three and nine months ended September 30, 2021 was due to higher investment management fees from growth in assets under management and increased demand and retention for Health and Career products and services.

Oliver Wyman's revenue increased $130 million, or 27% to $610 million for the three months ended September 30, 2021 compared to $480 million for the three months ended September 30, 2020, reflecting an increase of 25% on an underlying basis and a 1% increase from the impact of foreign currency translation.

Oliver Wyman's revenue increased $355 million, or 24% to $1.8 billion for the nine months ended September 30, 2021 compared to $1.5 billion for the nine months ended September 30, 2020, reflecting an increase of 21% on an underlying basis and a 3% increase from the impact of foreign currency translation. The increase in underlying revenue at Oliver Wyman for the three and nine months ended September 30, 2021 primarily reflects the impact of increased demand for project-based services in the U.S.

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Operating Expense

Consolidated operating expense increased $415 million, or 12% to $3.8 billion for the three months ended September 30, 2021 compared to $3.4 billion for the three months ended September 30, 2020, reflecting increases of 9% on an underlying basis, 2% from the impact of foreign currency translation and 1% from acquisitions. On an underlying basis, expenses increased 12% and 6% for the three months ended September 30, 2021 in Risk and Insurance Services and Consulting, respectively.

Consolidated operating expense increased $1.0 billion, or 10% to $11.4 billion for the nine months ended September 30, 2021 compared to $10.3 billion for the nine months ended September 30, 2020, reflecting increases of 6% on an underlying basis, 3% increase from the impact of foreign currency translation and 1% from acquisitions. On an underlying basis, expenses increased 7% and 5% for the nine months ended September 30, 2021 in Risk and Insurance Services and Consulting, respectively. Underlying expenses for the three and nine months ended September 30, 2021 primarily reflect higher incentive compensation and increase in base salaries for additional headcount.

Risk and Insurance Services

Expenses in the Risk and Insurance Services segment increased $309 million, or 16% to $2.3 billion for the three months ended September 30, 2021 compared to $2.0 billion for the three months ended September 30, 2020. This reflects increases of 2% for both foreign currency translation and acquisitions. On an underlying basis, expenses increased 12%, reflecting the impact of higher incentive compensation and increases in base salaries for additional headcount.

Expenses in the Risk and Insurance Services segment increased $701 million, or 12% to $6.6 billion for the nine months ended September 30, 2021 compared to $5.9 billion for the nine months ended September 30, 2020. This reflects increases of 3% for foreign currency translation and 2% for acquisitions. On an underlying basis, expenses increased 7%, reflecting higher incentive compensation and increases in base salaries for additional headcount, partly offset by lower JLT integration and restructuring costs.

Consulting

Consulting expenses increased $103 million, or 7% to $1.5 billion for the three months ended September 30, 2021 compared to $1.4 billion for the three months ended September 30, 2020. This reflects increases of 1% from the impact of foreign currency translation and 6% on an underlying basis.

Consulting expenses increased $322 million, or 8% to $4.6 billion for the nine months ended September 30, 2021 compared to $4.3 billion for the first nine months ended September 30, 2020. This reflects an increase of 3% from the impact of foreign currency translation and 5% on an underlying basis. The increase in underlying expense in the Consulting segment for the three and nine months ended September 30, 2021 primarily reflects higher incentive compensation expense, partially offset by a $63 million reduction in the liability for a legacy JLT E&O, as well as recoveries under indemnities and insurance.

Corporate and Other

Corporate expenses were $67 million for the three months ended September 30, 2021 compared to $71 million for the three months ended September 30, 2020 and $196 million for the nine months ended September 30, 2021 compared to $203 million for the nine months ended September 30, 2020. The decrease is primarily due to lower integration and restructuring costs.

Interest

Interest expense decreased $21 million and $52 million in the three and nine months ended September 30, 2021 compared with the same periods of 2020 due to lower average debt levels in 2021 compared with the same period last year.

Investment Income (Loss)

The caption "Investment income (loss)" in the consolidated statements of income comprises realized and unrealized gains and losses from investments. It includes, when applicable, other than temporary declines in the value of securities, mark-to-market increases or decreases in equity investments with readily determinable fair values and equity method gains or losses on its investments in private equity funds. The Company's investments may include direct investments in insurance, consulting or other strategically linked companies and investments in private equity funds.

The Company recorded net investment income of $13 million and $43 million for the three and nine periods ended September 30, 2021 compared to net investment losses of $14 million and $47 million for the same periods last

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year. The income in 2021 is primarily driven by gains in the Company's private equity investments compared to losses for the same periods in prior year. The net investment loss reported in the third quarter of 2020 is primarily

due to the mark-to-market change related to the Company's investment in Alexander Forbes ("AF"). Prior year also included a loss of $23 million for the nine month period ended September 30, 2020 related to the Company's investment in AF.

Income and Other Taxes

The Company's effective tax rate in the third quarter of 2021 was 24.2% compared with 30.3% in the third quarter of 2020. The effective tax rates for the nine months ended September 30, 2021 and 2020 were 27.1% and 26.0%, respectively.

The rate in the third quarter of 2021 reflects tax benefits from planning implemented in the period that postponed the utilization of current-year losses in the U.K. to a future year when the tax rate will be 25%, additional tax benefits related to share-based compensation offset by changes to uncertain tax positions, deferred tax and other tax adjustments. The rate for the nine months ended September 30, 2021 reflects the charge recorded in the second quarter of approximately $100 million for re-measuring the Company’s U.K. deferred tax assets and liabilities upon the enactment of legislation on June 10, 2021, commonly referred to as the "Finance Act 2021". The legislation increased the U.K. corporate income tax rate from 19% to 25% effective April 1, 2023. This is the most significant discrete item in the year-to-date period, increasing the Company’s effective tax rate by 3.1% for the nine months ended September 30, 2021.

The rate in the third quarter and nine months ended September 30, 2020 reflects costs of re-measuring the Company’s U.K. deferred tax assets and liabilities upon the enactment of legislation that cancelled a scheduled 2% reduction in the U.K. corporate income tax rate, partially offset by tax benefits for the implementation of a new international funding structure to facilitate global staffing and contracting.

The tax rates in both periods reflect the impact of discrete tax matters such as excess tax benefits related to share-based compensation, enacted tax legislation, changes in uncertain tax positions, deferred tax adjustments and non-taxable adjustments to contingent acquisition consideration.

The effective tax rate may vary significantly from period to period. The effective tax rate is sensitive to the geographic mix and repatriation of the Company's earnings, which may result in higher or lower effective tax rates. Thus, a shift in the mix of profits among jurisdictions, or changes in the Company’s repatriation strategy to access offshore cash, can affect the effective tax rate.

In addition, losses in certain jurisdictions cannot be offset by earnings from other operations, and may require valuation allowances that affect the rate in a particular period, depending on estimates of the value of associated deferred tax assets which can be realized. A valuation allowance was recorded to reduce deferred tax assets to the amount that the Company believes is more likely than not to be realized. The effective tax rate is also sensitive to changes in unrecognized tax benefits, including the impact of settled tax audits and expired statutes of limitation.

Changes in tax laws, rulings, policies or related legal and regulatory interpretations occur frequently and may have a significant favorable or adverse impact on our effective tax rate.

As a U.S. domiciled parent holding company, the Company is the issuer of essentially all of the external indebtedness and incurs the related interest expense in the U.S. The Company’s interest expense deductions are not currently limited. Further, most senior executive and oversight functions are conducted in the U.S. and the associated costs are incurred primarily in the U.S. Some of these expenses may not be deductible in the U.S., which may impact the effective tax rate.

The quasi-territorial U.S. tax regime provides an opportunity for the Company to repatriate foreign earnings more tax efficiently and there is less incentive for permanent reinvestment of these earnings. However, permanent reinvestment continues to be a component of the Company’s global capital strategy. For post 2017 years, including 2021, the Company continues to evaluate its global investment and repatriation strategy in light of its capital requirements, considering the Tax Cuts and Jobs Act (the "TCJA") and the quasi-territorial tax regime for future foreign earnings.

The Company has established liabilities for uncertain tax positions in relation to potential assessments in the jurisdictions in which it operates. The Company believes the resolution of tax matters will not have a material effect on the consolidated financial position of the Company, although a resolution of tax matters could have a material impact on the Company's net income or cash flows and on its effective tax rate in a particular future period. It is reasonably possible that the total amount of unrecognized tax benefits will decrease between zero and approximately $33 million within the next twelve months due to settlement of audits and expiration of statutes of limitation.

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The Coronavirus Aid, Relief and Economic Security Act (the "CARES Act") was signed into law on March 27, 2020. The CARES Act provided over $2 trillion in economic relief to individuals, governmental agencies and companies, to deal with the public health and economic impacts of COVID-19. Pursuant to the CARES Act, payroll taxes due from March 27, 2020 through December 31, 2020 were deferred until 2021 and 2022 (50% to be paid each year) without interest or penalties.

Liquidity and Capital Resources

The Company is organized as a legal entity separate and distinct from its operating subsidiaries. As the Company does not have significant operations of its own, the Company is dependent upon dividends and other payments from its operating subsidiaries to pay principal and interest on its outstanding debt obligations, pay dividends to stockholders, repurchase its shares and pay corporate expenses. The Company can also provide financial support to its operating subsidiaries for acquisitions, investments and certain parts of their business that require liquidity, such as the capital markets business of Guy Carpenter. Other sources of liquidity include borrowing facilities discussed in financing cash flows.

The Company derives a significant portion of its revenue and operating profit from operating subsidiaries located outside of the United States. Funds from those operating subsidiaries are regularly repatriated to the United States out of annual earnings. At September 30, 2021, the Company had approximately $815 million of cash and cash equivalents in its foreign operations, which includes $283 million of operating funds required to be maintained for regulatory requirements or as collateral under certain captive insurance arrangements. The Company expects to continue its practice of repatriating available funds from its non-U.S. operating subsidiaries out of current annual earnings. Where appropriate, a portion of the current year earnings will continue to be permanently reinvested. With respect to repatriating 2018 and prior earnings, the Company has evaluated such factors as its short- and long-term capital needs, acquisition and borrowing strategies, and the availability of cash for repatriation for each of its subsidiaries. The Company has determined that, in general, its permanent reinvestment assertions, in light of the enactment of the Tax Cuts and Jobs Act, should allow the Company to repatriate previously taxed earnings from the deemed repatriations as cash becomes available.

During the first nine months of 2021, the Company recorded foreign currency translation adjustments which decreased net equity by $413 million. Continued strengthening of the U.S. dollar against foreign currencies would further decrease the translated U.S. dollar value of the Company’s net investments in its non-U.S. subsidiaries, as well as the translated U.S. dollar value of cash repatriations from those subsidiaries.

Cash on our consolidated balance sheets includes funds available for general corporate purposes. Funds held on behalf of clients in a fiduciary capacity are segregated and shown separately in the consolidated balance sheets as an offset to fiduciary liabilities. Fiduciary funds cannot be used for general corporate purposes, and should not be considered as a source of liquidity for the Company.

Operating Cash Flows

The Company generated $2.1 billion of cash from operations for the nine months ended September 30, 2021 compared to $2.0 billion generated by operations in the first nine months of 2020. These amounts reflect the net income of the Company during those periods, excluding gains or losses from investments, adjusted for non-cash charges and changes in working capital which relate primarily to the timing of payments of accrued liabilities and pension plan contributions or receipts of assets. The Company paid $58 million and $169 million related to the JLT integration and restructuring activity for the nine months ended September 30, 2021 and 2020, respectively.

Pension Related Items

Contributions

The Company's policy for funding its tax-qualified defined benefit plans is to contribute amounts at least sufficient to meet the funding requirements set forth in accordance with applicable law. During the first nine months of 2021, the Company contributed $63 million to its non-U.S. defined benefit pension plans and $27 million to its U.S. defined benefit pension plans. In the first nine months of 2020, the Company contributed $56 million to its non-U.S. defined benefit pension plans and $25 million to its U.S. defined benefit pension plans.

In the United States, contributions to the tax-qualified defined benefit plans are based on ERISA guidelines.

Outside the U.S., the Company has a large number of non-U.S. defined benefit pension plans, the largest of which are in the U.K., which comprise approximately 81% of non-U.S. plan assets at December 31, 2020. Contribution rates for non-U.S. plans are generally based on local funding practices and statutory requirements, which may differ significantly from measurements under U.S. GAAP.

In the U.K., the assumptions used to determine pension contributions are the result of legally-prescribed negotiations between the Company and the plans' trustee that typically occur every three years in conjunction with

45

the actuarial valuation of the plans. Currently, this results in a lower funded status compared to U.S. GAAP and may result in contributions irrespective of the U.S. GAAP funded status. For the MMC U.K. Pension Fund, a new agreement was reached with the trustee in the fourth quarter of 2019 based on the surplus funding position at December 31, 2018. In accordance with the agreement, no deficit funding is required until 2023. The funding level will be re-assessed during 2022 to determine if contributions are required in 2023. In order to have greater influence over asset allocation and overall investment decisions, in November 2019, the Company renewed its agreement to support annual deficit contributions by the U.K. operating companies under certain circumstances, up to GBP 450 million over a seven-year period.

The Company has agreed to a deficit funding plan with the trustee of the U.K. JLT Pension Scheme to fund $41 million in 2021.

The Company expects to fund an additional $31 million to its non-U.S. defined benefit plans over the remainder of 2021, comprising approximately $17 million to plans outside of the U.K. and $14 million to the U.K. plans. The Company expects to fund an additional $8 million to its U.S. defined benefit plans during the remainder of 2021.

Financing Cash Flows

Net cash used for financing activities was $2.0 billion for the nine months ended September 30, 2021, compared with $163 million of net cash used by such activities for the same period in 2020.

On April 9, 2021, the Company increased its short-term commercial paper financing program to $2.0 billion from $1.5 billion. The Company had no commercial paper outstanding at September 30, 2021.

Credit Facilities

On April 2, 2021, the Company entered into an amended and restated multi-currency unsecured $2.8 billion five-year revolving credit facility ("New Facility"). The interest rate on the New Facility is based on LIBOR plus a fixed margin which varies with the Company’s credit ratings. The New Facility expires in April 2026 and requires the Company to maintain certain coverage and leverage ratios which are tested quarterly. The New Facility includes provisions for determining a LIBOR successor rate in the event LIBOR reference rates are no longer available or in certain other circumstances which are determined to make using an alternative rate desirable. As of September 30, 2021, the Company had no borrowings under this facility. In connection with the New Facility, the Company terminated its previous multicurrency unsecured $1.8 billion five-year revolving credit facility and its unsecured $1 billion 364-day unsecured revolving credit facility ("364-day Facility").

In January 2020, the Company closed on $500 million one-year and $500 million two-year term loan facilities. In the first quarter of 2020 the Company borrowed $1 billion against these facilities, which were subsequently repaid during the third and fourth quarters of 2020. These two facilities were terminated as of December 31, 2020 after repayment of the initial draw down.

Additional credit facilities, guarantees and letters of credit are maintained with various banks, primarily related to operations located outside the United States, aggregating $512 million at September 30, 2021 and $573 million at December 31, 2020. There were no outstanding borrowings under these facilities at September 30, 2021 and December 31, 2020.

Debt

On April 15, 2021, the Company repaid $500 million of senior notes maturing in July 2021.

In May 2020, the Company issued $750 million of senior notes.

In March 2020, the Company repaid $500 million of maturing senior notes.

The Company's senior debt is currently rated A- by Standard & Poor's ("S&P") and Baa1 by Moody's. The Company's short-term debt is currently rated A-2 by S&P and P-2 by Moody's. The Company carries a Stable outlook with both S&P and Moody's.

Share Repurchases

In November 2019, the Board of Directors authorized an increase in the Company’s share repurchase program, which supersedes any prior authorization, allowing management to buy back up to $2.5 billion of the Company’s common stock. During the first nine months of 2021, the Company repurchased 5.3 million shares of its common stock for total consideration of approximately $734 million. As of September 30, 2021, the Company remained authorized to purchase shares of its common stock up to a value of approximately $1.7 billion. There is no time limit on this authorization. There were no repurchases of the Company's common stock during the nine months ending September 30, 2020.

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Contingent Payments Related to Acquisitions

During the first nine months of 2021, the Company paid $72 million of contingent payments related to acquisitions made in prior periods and received cash of $90 million related to dispositions made in prior years. These payments are split between financing and operating cash flows in the consolidated statements of cash flows. Payments of $26 million related to the contingent consideration liability that was recorded on the date of acquisition are reflected as financing cash flows. Payments related to increases in the contingent consideration liability subsequent to the date of acquisition of $46 million are reflected as operating cash flows. Operating cash flows also include cash receipts of approximately $19 million due to increases in the contingent consideration receivables subsequent to the date of dispositions. Remaining estimated future contingent consideration payments of $303 million for acquisitions completed in the first nine months of 2021 and in prior years are recorded in accounts payable and accrued liabilities or other liabilities in the consolidated balance sheet at September 30, 2021.

The Company paid deferred purchase consideration related to prior years' acquisitions of $84 million in the first nine months of 2021. Financing cash flows also reflect the receipt of contingent consideration of $71 million related to prior year dispositions. Remaining deferred cash payments of approximately $203 million for acquisitions completed in prior years are recorded in accounts payable and accrued liabilities or other liabilities in the consolidated balance sheet at September 30, 2021.

In the first nine months of 2020, the Company paid $101 million of contingent payments related to acquisitions made in prior periods. Of this amount, $65 million was reported as financing cash flows and $36 million as operating cash flows.

Dividends

The Company paid dividends on its common shares of $750 million ($1.465 per share) during the first nine months of 2021, as compared with $702 million ($1.375 per share) during the first nine months of 2020.

Derivatives

Net Investment Hedge

The Company has investments in various subsidiaries with Euro functional currencies. As a result, the Company is exposed to the risk of fluctuations between the Euro and U.S. dollar exchange rates. As part of its risk management program to fund the JLT acquisition, the Company issued €1.1 billion Senior Notes, and designated the debt instruments as a net investment hedge of its Euro denominated subsidiaries. The hedge is re-assessed each quarter to confirm that the designated equity balance at the beginning of each period continues to equal or exceed 80% of the outstanding balance of the Euro debt instrument and that all the critical terms of the hedging instrument and the hedged net investment continue to match. The Company concluded that the hedge continues to be highly effective as of September 30, 2021, and the change in the debt balance related to foreign exchange fluctuations was recorded in foreign currency translation gains (losses) in the consolidated balance sheet. The U.S. dollar value of the Euro notes decreased by $63 million through September 30, 2021 due to the impact foreign exchange rates, with a corresponding decrease to accumulated other comprehensive loss.

Investing Cash Flows

Net cash used for investing activities amounted to $589 million in the first nine months of 2021, compared with $646 million used during the same period in 2020.

The Company paid $401 million and $559 million, net of cash acquired, for acquisitions it made during the first nine months of 2021 and 2020, respectively.

During the first nine months of 2021 and 2020, the Company sold certain businesses, primarily in the U.S. and U.K., for cash proceeds of approximately $84 million and $93 million, respectively.

The Company used cash of $268 million to purchase fixed assets and capitalized software in the first nine months of 2021, compared with $278 million in the first nine months of 2020, primarily related to computer equipment and software purchases, software development costs and the refurbishing and modernizing of office facilities.

In 2020, the Company sold approximately 240 million shares of the common stock of AF.

The Company has commitments for potential future investments of approximately $27 million in five private equity funds that invest primarily in financial services companies.

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Commitments and Obligations

The following table reflects the Company’s contractual obligations by type as of September 30, 2021:

(In millions)	Payment due by Period
Contractual Obligations	Total		Within 1 Year		1-3 Years		4-5 Years		After 5 Years
Short-term debt	$	516	$	516	$	—	$	—	$	—
Long-term debt	10,292		—		2,235		1,780		6,277
Interest on long-term debt	5,026		420		775		612		3,219
Net operating leases	2,533		396		660		521		956
Service agreements	196		98		72		23		3
Other long-term obligations	574		209		353		10		2
Total	$	19,137	$	1,639	$	4,095	$	2,946	$	10,457

The table does not include unrecognized tax benefits of $101 million as the Company is unable to reasonably predict the timing of settlement of these liabilities, other than approximately $22 million that may become payable within one year. The table also excludes the provisional estimate of remaining transitional tax payments related to the Tax Cuts and Job Act ("the TCJA") of $66 million.

Management’s Discussion of Critical Accounting Policies

The Company’s discussion of critical accounting policies that place the most significant demands on management’s judgment and requires management to make significant estimates about matters that are inherently uncertain are discussed in the MD&A in the 2020 Form 10-K.

New Accounting Guidance

Note 19 to the consolidated financial statements in this report contains a discussion of recently issued accounting guidance and their impact or potential future impact on the Company’s financial results, if determinable.

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Item 3.Quantitative and Qualitative Disclosures About Market Risk.

Market Risk and Credit Risk

Certain of the Company’s revenues, expenses, assets and liabilities are exposed to the impact of interest rate changes and fluctuations in foreign currency exchange rates and equity markets.

Interest Rate Risk and Credit Risk

Interest income generated from the Company's cash investments as well as invested fiduciary funds will vary with the general level of interest rates.

The Company had the following investments subject to variable interest rates:

(In millions of dollars)	September 30, 2021
Cash and cash equivalents invested in money market funds, certificates of deposit and time deposits	$	1,398
Fiduciary cash and investments	$	10,408

Based on these balances, if short-term interest rates increased or decreased by 10%, or 2 basis points, over the full year, annual interest income, including interest earned on fiduciary funds, would increase or decrease by approximately $1 million.

Changes in interest rates can also affect the discount rate and assumed rate of return on plan assets, two of the assumptions among several others used to measure net periodic pension expense. The assumptions used to measure plan assets and liabilities are typically assessed at the end of each year, and determine the expense for the subsequent year. Assumptions used to determine net periodic expense for 2021 are discussed in Note 8 to the consolidated financial statements included in our most recently filed Annual Report on Form 10-K. For a discussion on pension expense sensitivity to changes in these rates, see the "Management’s Discussion and Analysis of Financial Condition and Results of Operations-Management’s Discussion of Critical Accounting Policies-Retirement Benefits" section of our most recently filed Annual Report on Form 10-K.

In addition to interest rate risk, our cash investments and fiduciary fund investments are subject to potential loss of value due to counter-party credit risk. To minimize this risk, the Company invests pursuant to a Board approved investment policy. The policy mandates the preservation of principal and liquidity and requires broad diversification with counter-party limits assigned based primarily on credit rating and type of investment. The Company carefully monitors its cash and fiduciary fund investments and will further restrict the portfolio as appropriate to market conditions. The majority of cash and fiduciary fund investments are invested in short-term bank deposits and liquid money market funds.

Foreign Currency Risk

The translated values of revenue and expense from the Company’s international operations are subject to fluctuations due to changes in currency exchange rates. The non-U.S. based revenue that is exposed to foreign exchange fluctuations is approximately 53% of total revenue. We periodically use forward contracts and options to limit foreign currency exchange rate exposure on net income and cash flows for specific, clearly defined transactions arising in the ordinary course of business. Although the Company has significant revenue generated in foreign locations which is subject to foreign exchange rate fluctuations, in most cases both the foreign currency revenue and expenses are in the functional currency of the foreign location. As such, under normal circumstances, the U.S. dollar translation of both the revenues and expenses, as well as the potentially offsetting movements of various currencies against the U.S. dollar, generally tends to mitigate the impact on net operating income of foreign currency risk. However, there have been periods where the impact was not mitigated due to external market factors, and external macroeconomic events may result in greater foreign exchange rate fluctuations in the future. If foreign exchange rates of major currencies (Euro, Sterling, Australian dollar and Canadian dollar) moved 10% in the same direction against the U.S. dollar that held constant over the course of the year, the Company estimates that full year net operating income would increase or decrease by approximately $65 million. The Company has exposure to approximately 80 foreign currencies overall. If exchange rates at September 30, 2021 hold constant for the rest of 2021, the Company estimates the year-over-year impact from conversion of foreign currency earnings will increase full year net operating income by approximately $49 million.

In Continental Europe, the largest amount of revenue from renewals for the Risk and Insurance Services segment occurs in the first quarter.

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Equity Price Risk

The Company holds investments in both public and private companies as well as private equity funds, including investments of approximately $74 million that are valued using readily determinable fair values and approximately $33 million of investments without readily determinable fair values. The Company also has investments of approximately $328 million that are accounted for using the equity method. The investments are subject to risk of decline in market value, which, if determined to be other than temporary for assets without readily determinable fair values, could result in realized impairment losses. The Company periodically reviews the carrying value of such investments to determine if any valuation adjustments are appropriate under the applicable accounting pronouncements.

At September 30, 2021, the Company owns approximately 14% of the common stock of Alexander Forbes ("AF"), a South African company listed on the Johannesburg Stock Exchange, at a closing share price of 4.15 South African Rand per share. The investment in AF is accounted at fair value, with investment gains and losses recorded as investment income in the consolidated statement of income. The fair value of this investment at September 30, 2021 was approximately $55 million.

Other

A number of lawsuits and regulatory proceedings are pending. See Note 17 ("Claims, Lawsuits and Other Contingencies") to the consolidated financial statements in this report.

Item 4. Controls & Procedures.

a. Evaluation of Disclosure Controls and Procedures

Based on their evaluation, as of the end of the period covered by this report, the Company’s Chief Executive Officer and Chief Financial Officer have concluded that the Company’s disclosure controls and procedures (as defined in Rules 13a-15(e) or 15d-15(e) under the Securities Exchange Act of 1934) are effective.

b. Changes in Internal Control

There were no other changes in the Company’s internal control over financial reporting identified in connection with the evaluation required by Rules 13a-15(d) or 15d-15(d) under the Securities Exchange Act of 1934 that occurred during the Company’s last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 1.     Legal Proceedings.

The Company and its subsidiaries are also party to a variety of other legal, administrative, regulatory and government proceedings, claims and inquiries arising in the normal course of business. Additional information regarding certain legal proceedings and related matters as set forth in Note 17 to the consolidated financial statements provided in Part I of this report is incorporated herein by reference.

Item 1A. Risk Factors.

The Company and its subsidiaries face a number of risks and uncertainties. In addition to the other information in this report and our other filings with the SEC, readers should consider carefully the risk factors discussed in "Part I, Item 1A. Risk Factors" in our Annual Report on Form 10-K for the year ended December 31, 2020.

If any of the risks described in our Annual Report on Form 10-K or such other risks actually occur, our business, results of operations or financial condition could be materially adversely affected.

Item 2.      Unregistered Sales of Equity Securities and Use of Proceeds.

Issuer Repurchases of Equity Securities

In November 2019, the Board of Directors of the Company authorized the Company to repurchase up to $2.5 billion in shares of the Company's common stock, which superseded any prior authorizations. The Company repurchased approximately 1.9 million shares of its common stock for $289 million during the third quarter of 2021. As of September 30, 2021, the Company remained authorized to repurchase up to approximately $1.7 billion in shares of its common stock. There is no time limit on the authorization.

Period	(a) Total Number of Shares (or Units) Purchased	(b) Average Price Paid per Share (or Unit)		(c) Total Number of Shares (or Units) Purchased as Part of Publicly Announced Plans or Programs	(d) Maximum Number (or Approximate Dollar Value) of Shares (or Units) that May Yet Be Purchased Under the Plans or Programs
July 1-31, 2021	703,299	$	142.8967	703,299	$	1,877,976,872
August 1-31, 2021	643,816	$	153.0324	643,816	$	1,779,452,151
September 1-30, 2021	572,329	$	158.0839	572,329	$	1,688,976,131
Total	1,919,444	$	150.8248	1,919,444	$	1,688,976,131

Item 3.      Defaults Upon Senior Securities.

None.

Item 4.      Mine Safety Disclosure.

Not Applicable.

Item 5.      Other Information.

None.

Item 6.      Exhibits.

See the Exhibit Index immediately following the signature page of this report, which is incorporated herein by reference.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Date:	October 21, 2021	/s/ Mark C. McGivney
		Mark C. McGivney
		Chief Financial Officer
Date:	October 21, 2021	/s/ Stacy M. Mills
		Stacy M. Mills
		Vice President & Controller
		(Chief Accounting Officer)

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EXHIBIT INDEX

Exhibit No.	Exhibit Name
31.1	Rule 13a-14(a)/15d-14(a) Certification of Chief Executive Officer
31.2	Rule 13a-14(a)/15d-14(a) Certification of Chief Financial Officer
32.1	Section 1350 Certifications
101.INS	XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH	XBRL Taxonomy Extension Schema
101.CAL	XBRL Taxonomy Extension Calculation Linkbase
101.DEF	XBRL Taxonomy Extension Definition Linkbase
101.LAB	XBRL Taxonomy Extension Label Linkbase
101.PRE	XBRL Taxonomy Extension Presentation Linkbase

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EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, Daniel S. Glaser, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Marsh & McLennan Companies, Inc. (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	October 21, 2021	/s/ Daniel S. Glaser
		Daniel S. Glaser
		President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Mark C. McGivney, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Marsh & McLennan Companies, Inc. (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	October 21, 2021	/s/ Mark C. McGivney
		Mark C. McGivney
		Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification of Chief Executive Officer and Chief Financial Officer

The certification set forth below is being submitted in connection with the Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2021 of Marsh & McLennan Companies, Inc. (the "Report") for the purpose of complying with Rule 13a-14(b) or Rule 15d-14(b) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and Section 1350 of Chapter 63 of Title 18 of the United States Code.

Daniel S. Glaser, the President and Chief Executive Officer, and Mark C. McGivney, Chief Financial Officer, of Marsh & McLennan Companies, Inc. each certifies that, to the best of his knowledge:

1.the Report fully complies with the requirements of Section 13(a) or 15(d) of the Exchange Act; and

2.the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Marsh & McLennan Companies, Inc.

Date:	October 21, 2021	/s/ Daniel S. Glaser
		Daniel S. Glaser
		President and Chief Executive Officer

Date:	October 21, 2021	/s/ Mark C. McGivney
		Mark C. McGivney
		Chief Financial Officer

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Oct. 15, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity Registrant Name	Marsh & McLennan Companies, Inc.
Entity Address, Address Line One	1166 Avenue of the Americas
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10036
City Area Code	212
Local Phone Number	345-5000
Entity File Number	1-5998
Entity Address, State or Province	DE
Entity Tax Identification Number	36-2668272
Title of 12(b) Security	Common Stock, par value $1.00 per share
Trading Symbol	MMC
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		504,895,367
Entity Central Index Key	0000062709
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false
New York Stock Exchange
Entity Information [Line Items]
Security Exchange Name	NYSE
Chicago Stock Exchange
Entity Information [Line Items]
Security Exchange Name	CHX

XML

Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 4,583	$ 3,968	$ 14,683	$ 12,808
Expense:
Compensation and benefits	2,853	2,495	8,520	7,479
Other operating expenses	990	933	2,837	2,834
Operating expenses	3,843	3,428	11,357	10,313
Operating income	740	540	3,326	2,495
Other net benefit credits	69	60	211	187
Interest income	1	1	2	5
Interest expense	(107)	(128)	(335)	(387)
Investment income (loss)	13	(14)	43	(47)
Income before income taxes	716	459	3,247	2,253
Income tax expense	174	139	880	586
Net income before non-controlling interests	542	320	2,367	1,667
Less: Net income attributable to non-controlling interests	5	4	27	25
Net income attributable to the Company	$ 537	$ 316	$ 2,340	$ 1,642
Net income per share attributable to the Company:
Basic (usd per share)	$ 1.06	$ 0.62	$ 4.61	$ 3.25
Diluted (usd per share)	$ 1.05	$ 0.62	$ 4.56	$ 3.21
Average number of shares outstanding:
Basic (in shares)	506	507	508	506
Diluted (in shares)	513	512	513	511
Shares outstanding (in shares)	505	507	505	507

XML

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income before non-controlling interests	$ 542	$ 320	$ 2,367	$ 1,667
Other comprehensive (loss) income, before tax:
Foreign currency translation (loss) gain adjustments	(346)	500	(413)	(200)
Gain (loss) related to pension/post-retirement plans	204	(73)	234	136
Other comprehensive (loss) income, before tax	(142)	427	(179)	(64)
Income tax expense (benefit) on other comprehensive income	50	(7)	56	29
Other comprehensive (loss) income, net of tax	(192)	434	(235)	(93)
Comprehensive income	350	754	2,132	1,574
Less: comprehensive income attributable to non-controlling interest	5	4	27	25
Comprehensive income attributable to the Company	$ 345	$ 750	$ 2,105	$ 1,549

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Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 1,398	$ 2,089
Receivables
Commissions and fees	5,190	4,679
Advanced premiums and claims	120	112
Other	475	677
Gross receivables	5,785	5,468
Less-allowance for credit losses	(161)	(142)
Net receivables	5,624	5,326
Other current assets	855	740
Total current assets	7,877	8,155
Goodwill	15,648	15,517
Other intangible assets	2,587	2,699
Fixed assets (net of accumulated depreciation and amortization of $2,327 at September 30, 2021 and $2,159 at December 31, 2020)	824	856
Pension related assets	1,935	1,768
Right of use assets	1,899	1,894
Deferred tax assets	692	702
Other assets	1,520	1,458
Total assets	32,982	33,049
Current liabilities:
Short-term debt	516	517
Accounts payable and accrued liabilities	2,833	3,050
Accrued compensation and employee benefits	2,365	2,400
Current lease liabilities	339	342
Accrued income taxes	333	247
Dividends payable	273	0
Total current liabilities	6,659	6,556
Fiduciary liabilities	10,408	8,585
Less – cash and investments held in a fiduciary capacity	(10,408)	(8,585)
Net fiduciary liabilities	0	0
Long-term debt	10,228	10,796
Pension, post-retirement and post-employment benefits	2,387	2,662
Long-term lease liabilities	1,900	1,924
Liabilities for errors and omissions	356	366
Other liabilities	1,564	1,485
Commitments and contingencies	0	0
Equity:
Preferred stock, $1 par value, authorized 6,000,000 shares, none issued	0	0
Common stock, $1 par value, authorized 1,600,000,000 shares, issued 560,641,640 shares at September 30, 2021 and December 31, 2020	561	561
Additional paid-in capital	1,034	943
Retained earnings	17,589	16,272
Accumulated other comprehensive loss	(5,345)	(5,110)
Non-controlling interests	154	156
Stockholders' equity before treasury stock	13,993	12,822
Less – treasury shares, at cost, 55,175,963 shares at September 30, 2021 and 52,914,550 shares at December 31, 2020	(4,105)	(3,562)
Total equity	9,888	9,260
Total liabilities and stockholders' equity	$ 32,982	$ 33,049

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Fixed assets, accumulated depreciation and amortization	$ 2,327	$ 2,159
Preferred stock, par value (usd per share)	$ 1	$ 1
Preferred stock, shares authorized	6,000,000	6,000,000
Preferred stock, shares issued	0	0
Common stock, par value (usd per share)	$ 1	$ 1
Common stock, shares authorized	1,600,000,000	1,600,000,000
Common stock, shares issued	560,641,640	560,641,640
Treasury shares, shares	55,175,963	52,914,550

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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating cash flows:
Net income before non-controlling interests	$ 2,367	$ 1,667
Adjustments to reconcile net income used for operations:
Depreciation and amortization of fixed assets and capitalized software	291	282
Amortization of intangible assets	278	265
Non cash lease expense	241	241
Adjustments and payments related to contingent consideration assets and liabilities	(16)	(14)
Provision for deferred income taxes	7	6
Net (gain) loss on investments	(43)	47
Net (gain) loss on disposition of assets	(37)	9
Share-based compensation expense	263	219
Changes in assets and liabilities:
Net receivables	(336)	77
Other current assets	(114)	(14)
Other assets	(115)	69
Accounts payable and accrued liabilities	(66)	(144)
Accrued compensation and employee benefits	(53)	(431)
Accrued income taxes	92	150
Contributions to pension and other benefit plans in excess of current year credit	(282)	(240)
Other liabilities	(96)	74
Operating lease liabilities	(262)	(254)
Effect of exchange rate changes	(45)	(10)
Net cash provided by operations	2,074	1,999
Financing cash flows:
Purchase of treasury shares	(734)	0
Borrowings from term-loan and credit facilities	0	1,000
Proceeds from issuance of debt	0	737
Repayments of debt	(512)	(1,011)
Purchase of non-controlling interests	0	(3)
Shares withheld for taxes on vested units – treasury shares	(99)	(131)
Issuance of common stock from treasury shares	115	98
Payments of deferred and contingent consideration for acquisitions	(110)	(125)
Receipts of contingent consideration for dispositions	71	0
Distributions of non-controlling interests	(27)	(26)
Dividends paid	(750)	(702)
Net cash used for financing activities	(2,046)	(163)
Investing cash flows:
Capital expenditures	(268)	(278)
Net sale of long term investments	2	102
Dispositions	84	93
Acquisitions	(401)	(559)
Other, net	(6)	(4)
Net cash used for investing activities	(589)	(646)
Effect of exchange rate changes on cash and cash equivalents	(130)	43
(Decrease) increase in cash and cash equivalents	(691)	1,233
Cash and cash equivalents at beginning of period	2,089	1,155
Cash and cash equivalents at end of period	$ 1,398	$ 2,388

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Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions	Total	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME	TREASURY SHARES	NON-CONTROLLING INTERESTS
Balance, beginning of period at Dec. 31, 2019		$ 561	$ 862	$ 15,199	$ (5,055)	$ (3,774)	$ 150
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accrued stock compensation costs			6
Issuance of shares under stock compensation plans and employee stock purchase plans			15			168
Other			(1)
Net income attributable to the Company	$ 1,667			1,642			25
Dividend equivalents declared				(9)
Dividends declared				(930)
Other comprehensive (loss) income, net of tax	(93)				(93)
Purchase of treasury shares						0
Net non-controlling interests disposed							(1)
Distributions and other changes							(13)
Balance, end of period at Sep. 30, 2020	$ 8,752	561	882	15,902	(5,148)	(3,606)	161
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share (in dollars per share)	$ 1.84
Balance, beginning of period at Jun. 30, 2020		561	814	16,060	(5,582)	(3,627)	166
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accrued stock compensation costs			69
Issuance of shares under stock compensation plans and employee stock purchase plans			(1)			21
Other			0
Net income attributable to the Company	$ 320			316			4
Dividend equivalents declared				(3)
Dividends declared				(471)
Other comprehensive (loss) income, net of tax	434				434
Purchase of treasury shares						0
Net non-controlling interests disposed							0
Distributions and other changes							(9)
Balance, end of period at Sep. 30, 2020	$ 8,752	561	882	15,902	(5,148)	(3,606)	161
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share (in dollars per share)	$ 0.93
Balance, beginning of period at Dec. 31, 2020	$ 9,260	561	943	16,272	(5,110)	(3,562)	156
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accrued stock compensation costs			41
Issuance of shares under stock compensation plans and employee stock purchase plans			50			191
Other			0
Net income attributable to the Company	2,367			2,340			27
Dividend equivalents declared				(8)
Dividends declared				(1,015)
Other comprehensive (loss) income, net of tax	(235)				(235)
Purchase of treasury shares	(734)					(734)
Net non-controlling interests disposed							0
Distributions and other changes							(29)
Balance, end of period at Sep. 30, 2021	$ 9,888	561	1,034	17,589	(5,345)	(4,105)	154
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share (in dollars per share)	$ 2.00
Balance, beginning of period at Jun. 30, 2021		561	945	17,597	(5,153)	(3,842)	156
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accrued stock compensation costs			89
Issuance of shares under stock compensation plans and employee stock purchase plans			0			37
Other			0
Net income attributable to the Company	$ 542			537			5
Dividend equivalents declared				(2)
Dividends declared				(543)
Other comprehensive (loss) income, net of tax	(192)				(192)
Purchase of treasury shares						(300)
Net non-controlling interests disposed							0
Distributions and other changes							(7)
Balance, end of period at Sep. 30, 2021	$ 9,888	$ 561	$ 1,034	$ 17,589	$ (5,345)	$ (4,105)	$ 154
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share (in dollars per share)	$ 1.07

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Nature of Operations

9 Months Ended

Sep. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Nature of Operations

Nature of Operations

Marsh & McLennan Companies, Inc. (the "Company" or "Marsh McLennan"), a global professional services firm, is organized based on the different services that it offers. Under this structure, the Company’s two business segments are Risk and Insurance Services and Consulting.

The Risk and Insurance Services segment ("RIS") provides risk management solutions, services, advice and insurance broking, reinsurance broking and insurance program management services for businesses, public entities, insurance companies, associations, professional services organizations, and private clients. The Company conducts business in this segment through Marsh and Guy Carpenter. Marsh advises individual and commercial clients of all sizes on insurance broking and innovative risk management solutions. Guy Carpenter develops advanced risk, reinsurance and capital strategies that help clients grow profitably and pursue emerging opportunities.

The Company conducts business in its Consulting segment through Mercer and Oliver Wyman Group. Mercer provides consulting expertise, advice, services and solutions in the areas of health, wealth and career consulting services and products. Oliver Wyman Group provides specialized management and economic and brand consulting services.

Business Update Related To COVID-19

The World Health Organization declared COVID-19 a pandemic in March 2020. The pandemic has impacted businesses globally including virtually every geography in which the Company operates. Governments continue to ease restrictions or fully reopen their economies, as the various vaccines are effective in mitigating the effects of the virus. Our businesses have been resilient throughout the pandemic and demand for our advice and services remains strong as the global economic conditions improve.

Although the vast majority of colleagues continue to work in a remote environment, the Company has provided guidelines on a gradual and phased return to the office depending on the level of virus containment and local health and safety regulations in each geography. The safety and well-being of our colleagues is paramount and the Company expects to continue to service clients effectively in the current remote environment and as colleagues gradually return to the office.

The Company had strong revenue growth through the first nine months of 2021 and benefited from the continued recovery of the global economy. However, uncertainty remains in the economic outlook and the ultimate extent of COVID-19 impact to the Company will depend on future developments that it is unable to predict, including new "waves" of infection from emerging variants of the virus, potential renewed restrictions and mandates by various governments or agencies, and the distribution and uptake of vaccines.

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Principles of Consolidation and Other Matters

9 Months Ended

Sep. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Principles of Consolidation and Other Matters

Principles of Consolidation and Other Matters

The Company prepared the consolidated financial statements included herein pursuant to the rules and regulations of the Securities and Exchange Commission. For interim filings, certain information and disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been omitted pursuant to such rules and regulations. The Company believes that the information and disclosures presented are adequate to make such information and disclosures not misleading. These consolidated financial statements should be read in conjunction with the consolidated financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 (the "2020 Form 10-K").

The financial information contained herein reflects all normal recurring adjustments which are, in the opinion of management, necessary for a fair presentation of the Company’s consolidated financial statements as of and for the nine months ended September 30, 2021 and 2020.

Estimates: The preparation of the consolidated financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expense during the reporting period. On an ongoing basis, the Company evaluates its estimates, judgments and methodologies. The estimates are based on historical experience and on various other assumptions that the Company believes are reasonable. Such matters include:

•the allowance for current expected credit losses on receivables

•estimates of revenue

•impairment assessments and charges

•recoverability of long-lived assets

•liabilities for errors and omissions

•deferred tax assets, uncertain tax positions and income tax expense

•share-based and incentive compensation expense

•useful lives assigned to long-lived assets, and depreciation and amortization

•fair value estimates of contingent consideration receivable or payable related to acquisitions or dispositions

The Company believes these estimates are reasonable based on information currently available at the time they are made. The Company also considered any COVID-19 potential impacts to its customer base in various industries and geographies. Insurance exposures subject to variable factors are subject to mid-term and end of term adjustments, as well as policy audits, which may reduce premiums and corresponding commissions. Estimates were updated based on internal and industry specific economic data. The ultimate extent to which COVID-19 will directly or indirectly impact the Company’s businesses, results of operations and financial condition will depend on numerous evolving factors and future developments that it is not able to predict. Actual results may differ from these estimates.

Cash and Cash Equivalents

Cash and cash equivalents primarily consist of certificates of deposit and time deposits, with original maturities of three months or less, and money market funds. The estimated fair value of the Company's cash and cash equivalents approximates their carrying value. The Company is required to maintain operating funds primarily related to regulatory requirements outside of the United States or as collateral under captive insurance arrangements. At September 30, 2021, the Company maintained $306 million compared to $270 million at December 31, 2020 related to these regulatory requirements.

Allowance for Credit Losses on Accounts Receivable

The Company’s policy for providing an allowance for credit losses on its accounts receivable is based on a combination of factors, including historical write-offs, aging of balances, and other qualitative and quantitative analyses. The charge related to expected credit losses was immaterial to the consolidated statement of income for the three and nine months ended September 30, 2021 and 2020.

Investments

The caption "Investment income (loss)" in the consolidated statements of income comprises realized and unrealized gains and losses from investments recognized in earnings. It includes, when applicable, other than temporary declines in the value of securities, mark-to-market increases or decreases in equity investments with readily determinable fair values and equity method gains or losses on the Company's investments in private equity funds.

The Company holds investments in certain private equity funds that are accounted for in accordance with the equity method of accounting using a consistently applied three-month lag period adjusted for any known significant changes from the lag period to the reporting date of the Company. The underlying private equity funds follow investment company accounting, where investments within the fund are carried at fair value. Investment gains or losses for the Company's proportionate share of the change in fair value of the funds are recorded in earnings. Investments accounted for using the equity method of accounting are included in "other assets" in the consolidated balance sheets.

The Company recorded net investment income of $13 million and $43 million for the three and nine months ended September 30, 2021 compared to net investment losses of $14 million and $47 million for the same periods last

year. The income in 2021 is primarily driven by gains in the Company's private equity investments compared to losses for the same periods in prior year. The net investment loss reported in the third quarter of 2020 is primarily

due to the mark-to-market change related to the Company's investment in Alexander Forbes ("AF"). The net

investment loss for the nine months ended September 30, 2020 also includes a loss of $23 million from the sale of

shares of AF during the second quarter of 2020, as well as losses related to its private equity fund investments.

Income Taxes

The Company's effective tax rate in the third quarter of 2021 was 24.2% compared with 30.3% in the third quarter of 2020. The effective tax rates for the nine months ended September 30, 2021 and 2020 were 27.1% and 26.0%, respectively.

The rate in the third quarter of 2021 reflects tax benefits from planning implemented in the period that postponed the utilization of current-year losses in the U.K. to a future year when the tax rate will be 25%, additional tax benefits related to share-based compensation offset by changes to uncertain tax positions, deferred tax and other tax adjustments. The rate in the nine months ended September 30, 2021 reflects the charge recorded in the second quarter of approximately $100 million to re-measure the Company’s U.K. deferred tax assets and liabilities upon the enactment of legislation on June 10, 2021, commonly referred to as the "Finance Act 2021". The legislation increased the U.K. corporate income tax rate from 19% to 25% effective April 1, 2023. This is the most significant discrete item in the year-to-date period, increasing the Company’s effective tax rate by 3.1% for the nine months ended September 30, 2021.

The rate in the third quarter and nine months ended September 30, 2020 reflects costs of re-measuring the Company’s U.K. deferred tax assets and liabilities upon the enactment of legislation that cancelled a scheduled 2% reduction in the U.K. corporate income tax rate, partially offset by tax benefits for the implementation of a new international funding structure to facilitate global staffing and contracting.

The tax rates in both periods reflect the impact of discrete tax items such as excess tax benefits related to share-based compensation, enacted tax legislation, changes in uncertain tax positions, deferred tax adjustments and nontaxable adjustments to contingent acquisition consideration.

The Company's tax rate reflects its income, statutory tax rates, and tax planning in the various jurisdictions in which it operates. Significant judgment is required in determining the annual effective tax rate and in evaluating uncertain tax positions.

Losses in one jurisdiction, generally, cannot offset earnings in another, and within certain jurisdictions profits and losses may not offset between entities. Consequently, losses in certain jurisdictions may require valuation allowances affecting the effective tax rate, depending on estimates of the realizability of associated deferred tax assets. The tax rate is also sensitive to changes in unrecognized tax benefits, including the impact of settled tax audits and expired statutes of limitation.

Changes in tax laws or tax rulings may have a significant impact on our effective tax rate. The Company reports a liability for unrecognized tax benefits resulting from uncertain tax positions taken or expected to be taken in tax returns. The Company's gross unrecognized tax benefits was $101 million at September 30, 2021 and $98 million at December 31, 2020. It is reasonably possible that the total amount of unrecognized tax benefits will decrease between zero and approximately $33 million within the next twelve months due to settlements of audits and expirations of statutes of limitation.

Integration and Restructuring Charges

Severance and related costs are recognized based on amounts due under established severance plans or estimates of one-time benefits that will be provided. Typically, severance benefits are recognized when the impacted colleagues are notified of their expected termination and such termination is expected to occur within the legally required notification period. These costs are included in compensation and benefits in the consolidated statements of income.

Costs for real estate consolidation are recognized based on the type of cost, and the expected future use of the facility. For locations where the Company does not expect to sub-lease the property, the amortization of any right-of-use asset is accelerated from the decision date to the cease use date. For locations where the Company expects to sub-lease the properties subsequent to its vacating the property, the right-of-use asset is reviewed for potential impairment at the earlier of the cease use date or the date a sub-lease is signed. To determine the amount of impairment, the fair value of the right-of-use asset is determined based on the present value of the estimated net cash flows related to the property. Contractual costs outside of the right-of-use asset are recognized based on the net present value of expected future cash outflows for which the Company will not receive any benefit. Such

amounts are based on estimates of future sub-lease income to be received and future contractual costs to be incurred. These costs are included in other operating expenses in the consolidated statements of income.

Other costs related to integration and restructuring, such as moving, legal or consulting costs are recognized as incurred. These costs are included in other operating expenses in the consolidated statements of income.

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Revenue

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Revenue

Revenue

The core principle of the revenue recognition guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The entity applies the following steps to achieve that principle: identify the contract(s) with the customer, identify the performance obligations in the contract(s), determine the transaction price, allocate the transaction price to the performance obligations in the contract and recognize revenue when (or as) the entity satisfies a performance obligation. A performance obligation is satisfied either at a “point in time” or “over time” depending on the nature of the product or service provided, and the specific terms of the contract with customers.

The Company's revenue recognition guidance is provided in more detail in Note 2 of the consolidated financial statements and the notes included in Form 10-K for the year ended December 31, 2020.

The following schedule disaggregates components of the Company's revenue:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2021		2020		2021		2020
Marsh:
EMEA	$	600	$	536	$	2,233	$	1,887
Asia Pacific	281		254		902		790
Latin America	105		93		298		283
Total International	986		883		3,433		2,960
U.S./Canada	1,366		1,126		3,894		3,271
Total Marsh	2,352		2,009		7,327		6,231
Guy Carpenter	314		274		1,697		1,534
Subtotal	2,666		2,283		9,024		7,765
Fiduciary interest income	4		8		12		40
Total Risk and Insurance Services	$	2,670	$	2,291	$	9,036	$	7,805
Mercer:
Wealth	$	613	$	566	$	1,861	$	1,719
Health	449		430		1,398		1,348
Career	253		220		618		549
Total Mercer	1,315		1,216		3,877		3,616
Oliver Wyman Group	610		480		1,813		1,458
Total Consulting	$	1,925	$	1,696	$	5,690	$	5,074

The Company recognizes commission revenue from arrangements for a significant portion of its brokerage arrangements at a point in time on the effective date of the underlying policy. Commission revenue is estimated using historical information about the risks to be covered over the policy period, some of which are dependent on variable factors such as number of employees covered, covered payroll, airline passenger miles flown, shipped tonnage of marine cargo and others.

The following schedule provides contract assets and contract liabilities information from contracts with customers:

(In millions)	September 30, 2021		December 31, 2020
Contract assets	$	307	$	236
Contract liabilities	$	738	$	676

The Company records accounts receivable when the right to consideration is unconditional, subject only to the passage of time. Contract assets primarily relate to quota share reinsurance brokerage and contingent insurer

revenue. The Company does not have the right to bill and collect revenue for quota share brokerage until the underlying policies written by the ceding insurer attach to the treaty. Contract assets are included in other current assets in the Company's consolidated balance sheets. Contract liabilities primarily relate to the advance consideration received from customers. Contract liabilities are included in current liabilities in the Company's consolidated balance sheets. Revenue recognized in the first nine months of 2021 and 2020 that was included in the contract liability balance at the beginning of each of those years was $511 million and $420 million, respectively.

The amount of revenue recognized in the first nine months of 2021 and 2020 from performance obligations satisfied in previous periods, mainly due to variable consideration from contracts with insurers, quota share business and consulting contracts previously considered constrained was $68 million and $84 million, respectively.

The Company applies the practical expedient and does not disclose the value of unsatisfied performance obligations for (1) contracts with original contract terms of one year or less and (2) contracts where the Company has the right to invoice for services performed. The revenue expected to be recognized in future periods during the non-cancellable term of existing contracts greater than one year that is related to performance obligations that are unsatisfied or partially satisfied at the end of the reporting period is approximately $54 million for Marsh, $204 million for Mercer and $4 million for Oliver Wyman Group. The Company expects revenue in 2022, 2023, 2024, 2025 and 2026 and beyond of $143 million, $66 million, $31 million, $14 million and $8 million, respectively, related to these performance obligations.

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Fiduciary Assets and Liabilities

9 Months Ended

Sep. 30, 2021

Fiduciary Assets And Liabilities [Abstract]

Fiduciary Assets and Liabilities

Fiduciary Assets and Liabilities

In its capacity as an insurance broker or agent, the Company collects premiums from insureds and, after deducting its commissions, remits the premiums to the respective insurance underwriters. The Company also collects claims or refunds from underwriters on behalf of insureds. Un-remitted insurance premiums and claims proceeds are held by the Company in a fiduciary capacity. Risk and Insurance Services revenue includes interest on fiduciary funds ("fiduciary interest income") of $4 million and $12 million for the three and nine month periods ended September 30, 2021, respectively, and $8 million and $40 million for the three and nine month periods ended September 30, 2020, respectively. The decrease in 2021 compared to 2020 reflects the impact of lower interest rates partially offset by a higher level of average invested funds. Since fiduciary assets are not available for corporate use, they are shown in the consolidated balance sheets as an offset to fiduciary liabilities.

Net uncollected premiums and claims and the related payables amounted to $12.7 billion at September 30, 2021 and $11.2 billion at December 31, 2020. The Company is not a principal to the contracts under which the right to receive premiums or the right to receive reimbursement of insured losses arises. Accordingly, net uncollected premiums and claims and the related payables are not assets and liabilities of the Company and are not included in the accompanying consolidated balance sheets.

In certain instances, the Company advances premiums, refunds or claims to insurance underwriters or insureds prior to collection. These advances are made from corporate funds and are reflected in the accompanying consolidated balance sheets as receivables.

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Per Share Data

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Per Share Data

Per Share Data

Basic net income per share attributable to the Company is calculated by dividing the after-tax income attributable to the Company by the weighted average number of outstanding shares of the Company’s common stock.

Diluted net income per share attributable to the Company is calculated by dividing the after-tax income attributable to the Company by the weighted average number of outstanding shares of the Company’s common stock, which have been adjusted for the dilutive effect of potentially issuable common shares.

Basic and Diluted EPS Calculation	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions, except per share data)	2021		2020		2021		2020
Net income before non-controlling interests	$	542	$	320	$	2,367	$	1,667
Less: Net income attributable to non-controlling interests	5		4		27		25
Net income attributable to the Company	$	537	$	316	$	2,340	$	1,642
Basic weighted average common shares outstanding	506		507		508		506
Dilutive effect of potentially issuable common shares	7		5		5		5
Diluted weighted average common shares outstanding	513		512		513		511
Average stock price used to calculate common stock equivalents	$	151.22	$	114.64	$	133.41	$	107.64

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Supplemental Disclosures to the Consolidated Statements of Cash Flows

9 Months Ended

Sep. 30, 2021

Supplemental Cash Flow Information [Abstract]

Supplemental Disclosures to the Consolidated Statements of Cash Flows

Supplemental Disclosures to the Consolidated Statements of Cash Flows

The following schedule provides additional information concerning acquisitions, interest and income taxes paid for the nine month periods ended September 30, 2021 and 2020.

(In millions)	2021		2020
Assets acquired, excluding cash	$	601	$	795
Liabilities assumed	(59)		(73)
Contingent/deferred purchase consideration	(141)		(163)
Net cash outflow for current year acquisitions	$	401	$	559

(In millions)	2021		2020
Interest paid	$	407	$	437
Income taxes paid, net of refunds	$	686	$	414

The classification of contingent consideration in the statement of cash flows is dependent upon whether the payment was part of the initial liability established on the acquisition date (financing) or an adjustment to the acquisition date liability (operating).

The following amounts are included in the consolidated statements of cash flows as a financing activity. The Company paid deferred and contingent consideration of $110 million for the nine months ended September 30, 2021. This consisted of deferred purchase consideration related to prior years' acquisitions of $84 million and contingent purchase consideration of $26 million. Cash flows from financing activities also reflect the receipt of contingent consideration of $71 million related to prior year dispositions. For the nine months ended September 30, 2020, the Company paid deferred and contingent consideration of $125 million, consisting of deferred purchase consideration related to prior years' acquisitions of $60 million and contingent consideration of $65 million.

The following amounts are included in the operating section of the consolidated statements of cash flows. For the nine months ended September 30, 2021, the Company recorded an expense for adjustments to contingent consideration liabilities of $35 million and made contingent consideration payments of $46 million. In addition, the Company recorded income of $24 million, primarily related to the settlement of contingent consideration receivables and received cash of $19 million related to prior year dispositions. For the nine months ended September 30, 2020, the Company recorded an expense for adjustments to contingent consideration liabilities of $22 million and made contingent consideration payments of $36 million.

The Company had non-cash issuances of common stock under its share-based payment plan of $225 million and $217 million for the nine months ended September 30, 2021 and 2020, respectively. The Company recorded stock-based compensation expense for equity awards related to restricted stock units, performance stock units and stock options of $263 million and $219 million for the nine months ended September 30, 2021 and 2020, respectively.

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Other Comprehensive Income (Loss)

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Other Comprehensive Income (Loss)

Other Comprehensive Income (Loss)

The changes, net of tax, in the balances of each component of Accumulated Other Comprehensive Income ("AOCI") for the three and nine months ended September 30, 2021 and 2020, including amounts reclassified out of AOCI, are as follows:

(In millions)	Pension/Post-Retirement Plans Gains (Losses)		Foreign Currency Translation Gains (Losses)		Total Gains (Losses)
Balance as of July 1, 2021	$	(4,102)	$	(1,051)	$	(5,153)
Other comprehensive income (loss) before reclassifications	115		(346)		(231)
Amounts reclassified from accumulated other comprehensive income	39		—		39
Net current period other comprehensive income (loss)	154		(346)		(192)
Balance as of September 30, 2021	$	(3,948)	$	(1,397)	$	(5,345)

(In millions)	Pension/Post-Retirement Plans Gains (Losses)		Foreign Currency Translation Gains (Losses)		Total Gains (Losses)
Balance as of July 1, 2020	$	(3,346)	$	(2,236)	$	(5,582)
Other comprehensive (loss) income before reclassifications	(94)		497		403
Amounts reclassified from accumulated other comprehensive income	31		—		31
Net current period other comprehensive (loss) income	(63)		497		434
Balance as of September 30, 2020	$	(3,409)	$	(1,739)	$	(5,148)

(In millions)	Pension/Post-Retirement Plans Gains (Losses)		Foreign Currency Translation Gains (Losses)		Total Gains (Losses)
Balance as of December 31, 2020	$	(4,126)	$	(984)	$	(5,110)
Other comprehensive income (loss) before reclassifications	63		(413)		(350)
Amounts reclassified from accumulated other comprehensive income	115		—		115
Net current period other comprehensive income (loss)	178		(413)		(235)
Balance as of September 30, 2021	$	(3,948)	$	(1,397)	$	(5,345)

(In millions)	Pension/Post-Retirement Plans Gains (Losses)		Foreign Currency Translation Gains (Losses)		Total Gains (Losses)
Balance as of December 31, 2019	$	(3,512)	$	(1,543)	$	(5,055)
Other comprehensive income (loss) before reclassifications	12		(196)		(184)
Amounts reclassified from accumulated other comprehensive income	91		—		91
Net current period other comprehensive income (loss)	103		(196)		(93)
Balance as of September 30, 2020	$	(3,409)	$	(1,739)	$	(5,148)

The components of other comprehensive income (loss) for the three and nine month periods ended September 30, 2021 and 2020 are as follows:

Three Months Ended September 30,	2021						2020
(In millions)	Pre-Tax		Tax (Credit)		Net of Tax		Pre-Tax		Tax (Credit)		Net of Tax
Foreign currency translation adjustments	$	(346)	$	—	$	(346)	$	500	$	3	$	497
Pension/post-retirement plans:
Amortization of gains included in net periodic pension cost:
Net actuarial losses (a)	52		13		39		40		9		31
Subtotal	52		13		39		40		9		31
Foreign currency translation adjustments	88		21		67		(113)		(19)		(94)
Effect of remeasurement	64		16		48		—		—		—
Pension/post-retirement plans gains (losses)	204		50		154		(73)		(10)		(63)
Other comprehensive (loss) income	$	(142)	$	50	$	(192)	$	427	$	(7)	$	434
(a) Components of net periodic pension cost are included in other net benefit credits in the consolidated statements of income. Income tax expense on net actuarial losses are included in income tax expense.

Nine Months Ended September 30,	2021						2020
(In millions)	Pre-Tax		Tax (Credit)		Net of Tax		Pre-Tax		Tax (Credit)		Net of Tax
Foreign currency translation adjustments	$	(413)	$	—	$	(413)	$	(200)	$	(4)	$	(196)
Pension/post-retirement plans:
Amortization of (gains) losses included in net periodic pension cost:
Prior service credits (a)	(1)		—		(1)		(1)		—		(1)
Net actuarial losses (a)	156		40		116		120		28		92
Subtotal	155		40		115		119		28		91
Foreign currency translation adjustments	7		1		6		17		5		12
Other adjustments	(7)		(2)		(5)		—		—		—
Effect of remeasurement	77		17		60		—		—		—
Effect of settlement	2		—		2		—		—		—
Pension/post-retirement plans gains	234		56		178		136		33		103
Other comprehensive (loss) income	$	(179)	$	56	$	(235)	$	(64)	$	29	$	(93)
(a) Components of net periodic pension cost are included in other net benefit credits in the consolidated statements of income. Income tax expense on net actuarial losses are included in income tax expense.

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Acquisitions and Dispositions

9 Months Ended

Sep. 30, 2021

Business Combination and Asset Acquisition [Abstract]

Acquisitions and Dispositions

Acquisitions and DispositionsThe Company’s acquisitions have been accounted for as business combinations. Net assets and results of operations are included in the Company’s consolidated financial statements commencing at the respective purchase closing dates. In connection with acquisitions, the Company records the estimated values of the net tangible assets and the identifiable intangible assets purchased, which typically consist of customer relationships, developed technology, trademarks and non-compete agreements. The valuation of purchased intangible assets involves significant estimates and assumptions. The Company estimates the fair value of purchased intangible assets, primarily using the income approach, by determining the present value of future cash flows over the remaining economic life of the respective assets. The significant estimates and assumptions used in this approach include the determination of the discount rate, economic life, future revenue growth rates, expected account attrition rates and earnings margins. Refinement and completion of final valuation of net assets acquired could affect the carrying value of tangible assets, goodwill and identifiable intangible assets.

The Risk and Insurance Services segment completed three acquisitions during the first nine months ended September 30, 2021:

•April – Marsh McLennan Agency ("MMA") acquired PayneWest Insurance, Inc., a Montana-based full-service broker providing business insurance, surety, employee benefits and personal insurance services to companies and individuals, and The Pryor Group, LLC, a Texas-based full-service broker providing business insurance with a specialty in quick service restaurants and the personal lines of franchise owners.

•September – MMA acquired Vaaler Insurance, Inc., a North Dakota-based insurance broker providing business insurance, employee health and benefits, and personal lines solutions, with specialized expertise in the construction, education, and healthcare industries.

Total purchase consideration for acquisitions made during the nine months ended September 30, 2021 was $546 million, which consisted of cash paid of $405 million and deferred purchase consideration and estimated contingent consideration of $141 million. Contingent consideration arrangements are based primarily on earnings before interest, tax, depreciation and amortization ("EBITDA") or revenue targets over a period of two to four years. The Company also paid $84 million of deferred purchase consideration and $72 million of contingent consideration related to acquisitions made in prior years. Estimated fair values of assets acquired and liabilities assumed are subject to adjustment until purchase accounting is finalized.

The following table presents the preliminary allocation of purchase consideration to the assets acquired and liabilities assumed during 2021 based on the estimated fair values for the acquisitions as of their respective acquisition dates:

Acquisitions through September 30, 2021
(In millions)
Cash	$	405
Estimated fair value of deferred/contingent consideration	141
Total consideration	$	546
Allocation of purchase price:
Cash and cash equivalents	$	4
Accounts receivable, net	32
Fixed assets, net	5
Other intangible assets	190
Goodwill	374
Total assets acquired	605
Current liabilities	27
Other liabilities	32
Total liabilities assumed	59
Net assets acquired	$	546

The purchase price allocation for assets acquired and liabilities assumed is based on estimates that are preliminary in nature and subject to adjustments, which could be material. Any necessary adjustments must be finalized during the measurement period, which for a particular asset, liability, or non-controlling interest ends once the acquirer determines that either (1) the necessary information has been obtained or (2) the information is not available. However, the measurement period for all items is limited to one year from the acquisition date.

The estimation of fair value requires numerous judgments, assumptions and estimates about future events and uncertainties, which could materially impact these values, and the related amortization, where applicable, in the Company’s results of operations.

The following chart provides information about intangible assets acquired during 2021:

Intangible assets through September 30, 2021 (In millions)	Amount		Weighted Average Amortization Period
Client relationships	$	176	13.7 years
Other	14		3.8 years
	$	190

The consolidated statements of income include the results of operations of acquired companies since their respective acquisition dates. The consolidated statements of income for the three and nine month periods ended September 30, 2021 include revenue of approximately $38 million and $73 million and operating income of $3 million and $4 million for acquisitions made in 2021. The consolidated statements of income for the three and nine month periods ended September 30, 2020 included approximately $52 million and $115 million of revenue, respectively, and operating loss of $8 million and operating income of $3 million, respectively, related to acquisitions made in 2020.

Dispositions

During the first nine months of 2021, the Company sold certain businesses, primarily in the U.S. and the U.K., for cash proceeds of approximately $84 million and recognized a net gain of approximately $50 million, primarily related to the commercial networks business in the U.K. that provided broking and back-office solutions for small independent brokers.

Prior-Year Acquisitions

The Risk and Insurance Services segment completed seven acquisitions during 2020:

•January – MMA acquired Momentous Insurance Brokerage Inc., a California-based full-service risk management and employee benefits firm specializing in high net worth private client services and insurance solutions for the entertainment industry, and Ironwood Insurance Services, LLC, an Atlanta-based broker that provides commercial property/casualty insurance, employee benefits, and private client solutions to mid-size businesses and individuals across the U.S.

•April – MMA acquired Assurance Holdings, Inc., an Illinois-based full service brokerage providing business insurance, employee benefits, private client insurance, and retirement services to businesses and individuals across the U.S.

•June – MMA acquired Nico Insurance Services, Inc., a California-based agency providing employee benefits solutions to groups and individuals.

•December – MMA acquired Heritage Insurance Services, Inc., a Kentucky-based full service broker that provides commercial property and casualty and personal lines primarily in the trucking and transportation industry, Inspro Insurance, Inc., a Nebraska-based full service broker that provides commercial property and casualty insurance, personal lines and employee benefits services, and Compass Financial Partners, LLC, a North Carolina-based retirement consulting and investment advisory firm.

Total purchase consideration for acquisitions made during the nine months ended September 30, 2020 was approximately $742 million, which consisted of cash paid of $579 million and deferred purchase and estimated contingent consideration of $163 million. Contingent consideration arrangements are based primarily on earnings before interest, tax, depreciation and amortization ("EBITDA") or revenue targets over a period of two to four years. For the first nine months of 2020, the Company also paid $60 million of deferred purchase consideration and $101 million of contingent consideration related to acquisitions made in prior years. Estimated fair values of assets acquired and liabilities assumed are subject to adjustment when purchase accounting is finalized.

Prior year dispositions

In the first nine months of 2020, the Company sold certain businesses primarily in the U.S., U.K. and Canada for cash proceeds of approximately $93 million.

Pro-Forma Information

The following unaudited pro-forma financial data gives effect to the acquisitions made by the Company during 2021 and 2020. In accordance with accounting guidance related to pro-forma disclosures, the information presented for acquisitions made in 2021 is as if they occurred on January 1, 2020 and reflects acquisitions made in 2020 as if they occurred on January 1, 2019. The unaudited pro-forma information adjusts for the effects of amortization of

acquired intangibles. The unaudited pro-forma financial data is presented for illustrative purposes only and is not necessarily indicative of the operating results that would have been achieved if such acquisitions had occurred on the dates indicated, nor is it necessarily indicative of future consolidated results.

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions, except per share data)	2021		2020		2021		2020
Revenue	$	4,587	$	4,019	$	14,730	$	12,955
Net income attributable to the Company	$	538	$	322	$	2,345	$	1,655
Basic net income per share attributable to the Company	$	1.06	$	0.63	$	4.62	$	3.27
Diluted net income per share attributable to the Company	$	1.05	$	0.63	$	4.57	$	3.24

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Goodwill and Other Intangibles

9 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangibles

Goodwill and Other Intangibles

The Company is required to assess goodwill and any indefinite-lived intangible assets for impairment annually, or more frequently if circumstances indicate impairment may have occurred. The Company performs the annual impairment assessment for each of its reporting units during the third quarter of each year. In accordance with applicable accounting guidance, a company can assess qualitative factors to determine whether it is necessary to perform a quantitative goodwill impairment test. Alternatively, the Company may elect to proceed directly to the quantitative goodwill impairment test. In 2021, the Company elected to perform a qualitative impairment assessment. As part of its assessment, the Company considered numerous factors, including:

•that the fair value of each reporting unit exceeds its carrying value by a substantial margin based on its most recent quantitative assessment in 2019;

•whether significant acquisitions or dispositions occurred which might alter the fair value of its reporting units;

•macroeconomic conditions and their potential impact on reporting unit fair values;

•actual performance compared with budget and prior projections used in its estimation of reporting unit fair values;

•industry and market conditions; and

•the year-over-year change in the Company’s share price.

The Company completed its qualitative assessment in the third quarter of 2021 and concluded that goodwill was not impaired.

Other intangible assets that are not deemed to have an indefinite life are amortized over their estimated lives and assessed for impairment upon the occurrence of certain triggering events in accordance with applicable accounting literature. Based on its assessment, the Company concluded that other intangible assets were not impaired. The Company does not have any indefinite lived intangible assets.

Changes in the carrying amount of goodwill are as follows:

September 30,
(In millions)	2021		2020
Balance as of January 1,	$	15,517	$	14,671
Goodwill acquired	374		462
Other adjustments(a)	(243)		(99)
Balance at September 30,	$	15,648	$	15,034

(a) Primarily reflects the impact of foreign exchange.

The goodwill arising from the acquisitions in 2021 and 2020 consist largely of the synergies and economies of scale

expected from combining the operations of the Company and the acquired entities and the trained and assembled

workforce acquired.

The goodwill acquired in 2021 and 2020 included approximately $374 million and $462 million, respectively, of which approximately $25 million and $140 million is deductible for tax purposes, and is primarily related to the Risk and Insurance Services segment.

Goodwill allocable to the Company’s reportable segments at September 30, 2021 is as follows: Risk and Insurance Services, $11.8 billion and Consulting, $3.8 billion.

The gross cost and accumulated amortization of identified intangible assets at September 30, 2021 and December 31, 2020 are as follows:

	September 30, 2021						December 31, 2020
(In millions)	Gross Cost		Accumulated Amortization		Net Carrying Amount		Gross Cost		Accumulated Amortization		Net Carrying Amount
Client relationships	$	3,827	$	1,331	$	2,496	$	3,713	$	1,170	$	2,543
Other (a)	367		276		91		386		230		156
Amortized intangibles	$	4,194	$	1,607	$	2,587	$	4,099	$	1,400	$	2,699

(a) Primarily non-compete agreements, trade names and developed technology.

Aggregate amortization expense for the nine months ended September 30, 2021 and 2020 was $278 million and $265 million, respectively. The estimated future aggregate amortization expense is as follows:

For the Years Ending December 31,
(In millions)	Estimated Expense
2021 (excludes amortization through September 30, 2021)	$	88
2022	329
2023	302
2024	281
2025	241
Subsequent years	1,346
Total future amortization	$	2,587

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Fair Value Measurements

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

Fair Value Hierarchy

The Company has categorized its assets and liabilities that are valued at fair value on a recurring basis into a three-level fair value hierarchy as defined by the FASB. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets and liabilities (Level 1) and lowest priority to unobservable inputs (Level 3). In some cases, the inputs used to measure fair value might fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy, for disclosure purposes, is determined based on the lowest level input that is significant to the fair value measurement. Assets and liabilities recorded in the consolidated balance sheets at fair value are categorized based on the inputs in the valuation techniques as follows:

Level 1.Assets and liabilities whose values are based on unadjusted quoted prices for identical assets or liabilities in an active market (examples include active exchange-traded equity securities and exchange-traded money market mutual funds).

Assets and liabilities measured using Level 1 inputs include exchange-traded equity securities, exchange-traded mutual funds and money market funds.

Level 2.Assets and liabilities whose values are based on the following:

a)Quoted prices for similar assets or liabilities in active markets;

b)Quoted prices for identical or similar assets or liabilities in non-active markets (examples include corporate and municipal bonds, which trade infrequently);

c)Pricing models whose inputs are observable for substantially the full term of the asset or liability (examples include most over-the-counter derivatives, including interest rate and currency swaps); and

d)Pricing models whose inputs are derived principally from or corroborated by observable market data through correlation or other means for substantially the full asset or liability (for example, certain mortgage loans).

Assets and liabilities using Level 2 inputs are related to an equity security.

Level 3.Assets and liabilities whose values are based on prices, or valuation techniques that require inputs that are both unobservable and significant to the overall fair value measurement. These inputs reflect management’s own assumptions about the assumptions a market participant would use in pricing the asset or liability.

Assets and liabilities measured using Level 3 inputs relate to assets and liabilities for contingent purchase consideration.

Valuation Techniques

Equity Securities, Money Market Mutual Funds and Mutual Funds – Level 1

Investments for which market quotations are readily available are valued at the sale price on their principal exchange or, for certain markets, official closing bid price. Money market mutual funds are valued using a valuation technique that results in price per share at $1.00.

Contingent Purchase Consideration Assets and Liabilities – Level 3

Purchase consideration for some acquisitions and dispositions made by the Company include contingent consideration arrangements. Contingent consideration arrangements are based primarily on EBITDA or revenue targets over a period of two to four years. The fair value of the contingent purchase consideration asset and liability is estimated as the present value of future cash flows to be paid, based on projections of revenue and earnings and related targets of the acquired and disposed entities.

The following fair value hierarchy table presents information about the Company’s assets and liabilities measured at fair value on a recurring basis as of September 30, 2021 and December 31, 2020:

	Identical Assets (Level 1)				Observable Inputs (Level 2)				Unobservable Inputs (Level 3)				Total
(In millions)	09/30/21		12/31/20		09/30/21		12/31/20		09/30/21		12/31/20		09/30/21		12/31/20
Assets:
Financial instruments owned:
Exchange traded equity securities(a)	$	60	$	59	$	—	$	—	$	—	$	—	$	60	$	59
Mutual funds(a)	193		186		—		—		—		—		193		186
Money market funds(b)	106		587		—		—		—		—		106		587
Other equity investment(a)	—		—		8		8		—		—		8		8
Contingent purchase consideration assets(c)	—		—		—		—		5		68		5		68
Total assets measured at fair value	$	359	$	832	$	8	$	8	$	5	$	68	$	372	$	908
Fiduciary Assets:
U.S. treasury bills	$	75	$	150	$	—	$	—	$	—	$	—	$	75	$	150
Money market funds	244		173		—		—		—		—		244		173
Total fiduciary assets measured at fair value	$	319	$	323	$	—	$	—	$	—	$	—	$	319	$	323
Liabilities:
Contingent purchase consideration liability(d)	$	—	$	—	$	—	$	—	$	303	$	243	$	303	$	243
Total liabilities measured at fair value	$	—	$	—	$	—	$	—	$	303	$	243	$	303	$	243

(a) Included in other assets in the consolidated balance sheets.

(b) Included in cash and cash equivalents in the consolidated balance sheets.

(c) Included in other receivables in the consolidated balance sheets.

(d) Included in accounts payable and accrued liabilities and other liabilities in the consolidated balance sheets.

The Level 3 assets in the chart reflect contingent purchase consideration from the sale of businesses. The change in the contingent purchase consideration assets from December 31, 2020 is driven primarily by cash receipts of approximately $90 million. This decrease was partially offset by the impact of accretion and adjustments to the fair value of the contingent purchase consideration assets.

During the nine months ended September 30, 2021, there were no assets or liabilities that were transferred between levels.

The following table sets forth a summary of the changes in fair value of the Company’s Level 3 liabilities for the three and nine month periods ended September 30, 2021 and 2020:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2021		2020		2021		2020
Balance at beginning of period	$	340	$	233	$	243	$	225
Net additions	1		—		99		96
Payments	(54)		(23)		(72)		(101)
Revaluation impact	18		18		35		8
Other (a)	(2)		2		(2)		2
Balance at September 30,	$	303	$	230	$	303	$	230

(a) Primarily reflects the impact of foreign exchange.

Long-Term Investments

The Company holds investments in public and private companies as well as certain private equity investments that are accounted for using the equity method of accounting. The carrying value of these investments was $328 million and $280 million at September 30, 2021 and December 31, 2020, respectively.

Investments in Public and Private Companies

The Company has investments in private insurance and consulting companies with a carrying value of $178 million and $169 million at September 30, 2021 and December 31, 2020, respectively. These investments are accounted for using the equity method of accounting, the results of which are included in revenue in the consolidated statements of income and the carrying value of which is included in other assets in the consolidated balance sheets. The Company records its share of income or loss on its equity method investments, some of which are on a one quarter lag basis.

Private Equity Investments

The Company's investments in private equity funds were $150 million and $111 million at September 30, 2021 and December 31, 2020, respectively. The carrying values of these private equity investments approximate fair value. The underlying private equity funds follow investment company accounting, where investments within the fund are carried at fair value. The Company records in earnings its proportionate share of the change in fair value of the funds on the investment income (loss) line in the consolidated statements of income. These investments are included in other assets in the consolidated balance sheets. The Company recorded net investment gains of $13 million and $40 million for the three and nine month periods ended September 30, 2021, respectively, and gain of $2 million and loss of $6 million from these investments for the same periods in 2020.

Other Investments

At September 30, 2021 and December 31, 2020, the Company held certain equity investments with readily determinable market values of $74 million and $72 million, respectively, including an investment in the common stock of Alexander Forbes ("AF") of $55 million at September 30, 2021 and $54 million at December 31, 2020. The Company also held investments without readily determinable market values of $33 million at both September 30, 2021 and December 31, 2020.

The Company sold 242 million shares of the common stock of AF during 2020. The investment in AF, which was accounted for using the equity method of accounting prior to the sale of these shares, is accounted for at fair value, with investment gains and losses recorded as investment income (loss) in the consolidated statement of income.

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Derivatives

9 Months Ended

Sep. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

Derivatives

Net Investment Hedge

The Company has investments in various subsidiaries with Euro functional currencies. As a result, the Company is exposed to the risk of fluctuations between the Euro and U.S. dollar exchange rates. The Company designated its €1.1 billion senior note debt instruments ("euro notes") as a net investment hedge (the "hedge") of its Euro denominated subsidiaries. The hedge effectiveness is re-assessed each quarter to confirm that the designated equity balance at the beginning of each period continues to equal or exceed 80% of the outstanding balance of the Euro debt instrument and that all the critical terms of the hedging instrument and the hedged net investment continue to match. The Company concluded that the hedge continues to be highly effective as of September 30,

2021, and the change in the debt balance related to foreign exchange fluctuations was recorded in foreign currency translation gains (losses) in the consolidated balance sheet. The U.S. dollar value of the euro notes decreased $63 million through September 30, 2021 due to the impact of foreign exchange rates, with a corresponding decrease to accumulated other comprehensive loss.

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Leases

9 Months Ended

Sep. 30, 2021

Leases [Abstract]

Leases

Leases

A lease is defined as a party obtaining the right to use an asset legally owned by another party. The Company determines if an arrangement is a lease at inception. Operating leases are recognized on the balance sheet as Right-of-Use ("ROU") assets and operating lease liabilities based on the present value of the remaining future minimum payments over the lease term at commencement date of the lease.

The Company uses discount rates to determine the present value of future lease payments. The Company primarily uses its incremental borrowing rate adjusted to reflect a secured rate, based on the information available for leases, including the lease term and interest rate environment in the country in which the lease exists. The lease terms used to calculate the ROU asset and lease liability may include options to extend or terminate when it is reasonably certain that the Company will exercise that option.

The Company leases office facilities under non-cancelable operating leases with terms generally ranging between 10 and 25 years. The Company utilizes these leased office facilities for use by its employees in countries in which the Company conducts its business. Leases are negotiated with third-parties and, in some instances contain renewal, expansion and termination options. The Company also subleases certain office facilities to third-parties when the Company no longer utilizes the space. None of the Company’s leases restrict the payment of dividends or the incurrence of debt or additional lease obligations, or contain significant purchase options. In addition to the base rental costs, our lease agreements generally provide for rent escalations resulting from increased assessments for real estate taxes and other charges. A portion of our real estate lease portfolio contains base rents subject to annual changes in the Consumer Price Index ("CPI") as well as charges for operating expenses which are reimbursable to the landlord based on actual usage. Changes to the CPI and payments for such reimbursable operating expenses are considered variable and are recognized as variable lease costs in the period in which the obligation for those payments is incurred. Approximately 99% of the Company’s lease obligations are for the use of office space. All of the Company’s material leases are operating leases.

As a practical expedient, the Company elected an accounting policy not to separate non-lease components from lease components and instead account as a single lease component. The Company also elected not to recognize ROU assets and lease liabilities for leases that, at the commencement date, are for 12 months or less.

The following chart provides additional information about the Company’s property leases:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2021		2020		2021		2020
Lease Cost:
Operating lease cost	$	93	$	99	$	282	$	288
Short-term lease cost	1		1		4		3
Variable lease cost	38		28		101		92
Sublease income	(3)		(5)		(16)		(15)
Net lease cost	$	129	$	123	$	371	$	368
Other information:
Operating cash outflows from operating leases					$	310	$	306
Right of use assets obtained in exchange for new operating lease liabilities					$	282	$	162
Weighted-average remaining lease term – real estate					9.0 years		8.4 years
Weighted-average discount rate – real estate leases					2.75%		3.02%

Future minimum lease payments for the Company’s operating leases as of September 30, 2021 are as follows:

Payment Dates (In millions)	Real Estate Leases
Remainder of 2021	$	102
2022	387
2023	340
2024	298
2025	266
2026	243
Subsequent years	897
Total future lease payments	2,533
Less: Imputed interest	(294)
Total	$	2,239
Current lease liabilities	$	339
Long-term lease liabilities	1,900
Total lease liabilities	$	2,239

Note: Table excludes obligations for leases with original terms of 12 months or less which have not been recognized as a right of use asset or liability in the consolidated balance sheets.

As of September 30, 2021, the Company had additional operating real estate leases that had not yet commenced of $13 million. These operating leases will commence over the next 12 months.

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Retirement Benefits

9 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

Retirement Benefits

Retirement Benefits

The Company maintains qualified and non-qualified defined benefit pension plans for some of its U.S. and non-U.S. eligible employees. The Company’s policy for funding its tax-qualified defined benefit pension plans is to contribute amounts at least sufficient to meet the funding requirements set forth in accordance with applicable law.

The target asset allocation for the Company's U.S. plans is 64% equities and equity alternatives and 36% fixed income. At September 30, 2021 the actual allocation for the Company's U.S. Plan was 65% equities and equity alternatives and 35% fixed income. The target allocation for the U.K. Plans at September 30, 2021 is 27% equities and equity alternatives and 73% fixed income. At September 30, 2021, the actual allocation for the U.K. Plans was 28% equities and equity alternatives and 72% fixed income. The Company's U.K. Plans comprised approximately 81% of non-U.S. plan assets at December 31, 2020. The assets of the Company's defined benefit plans are diversified and are managed in accordance with applicable laws and with the goal of maximizing the plans' real return within acceptable risk parameters. The Company generally uses threshold-based portfolio re-balancing to ensure the actual portfolio remains consistent with target asset allocation ranges.

The components of the net periodic benefit cost for defined benefit plans are as follows:

Combined U.S. and significant non-U.S. Plans	Pension Benefits
For the Three Months Ended September 30,
(In millions)	2021		2020
Service cost	$	9	$	10
Interest cost	87		112
Expected return on plan assets	(208)		(212)
Recognized actuarial loss	52		40
Total credit	$	(60)	$	(50)
Combined U.S. and significant non-U.S. Plans	Pension Benefits
For the Nine Months Ended September 30,
(In millions)	2021		2020
Service cost	$	29	$	27
Interest cost	258		322
Expected return on plan assets	(627)		(629)
Recognized actuarial loss	155		120
Net periodic benefit credit	$	(185)	$	(160)
Settlement loss	2		—
Total credit	$	(183)	$	(160)

Amounts Recorded in the Consolidated Statement of Income
Combined U.S. and significant non-U.S. Plans	Pension Benefits
For the Three Months Ended September 30,
(In millions)	2021		2020
Compensation and benefits expense	$	9	$	10
Other net benefit credit	(69)		(60)
Total credit	$	(60)	$	(50)

Amounts Recorded in the Consolidated Statement of Income
Combined U.S. and significant non-U.S. Plans	Pension Benefits
For the Nine Months Ended September 30,
(In millions)	2021		2020
Compensation and benefits expense	$	29	$	27
Other net benefit credit	(212)		(187)
Total credit	$	(183)	$	(160)

U.S. Plans only	Pension Benefits
For the Three Months Ended September 30,
(In millions)	2021		2020
Interest cost	$	47	$	53
Expected return on plan assets	(82)		(86)
Recognized actuarial loss	22		18
Net periodic benefit credit	$	(13)	$	(15)

U.S. Plans only	Pension Benefits
For the Nine Months Ended September 30,
(In millions)	2021		2020
Interest cost	$	139	$	160
Expected return on plan assets	(245)		(259)
Recognized actuarial loss	67		54
Net periodic benefit credit	$	(39)	$	(45)

Significant non-U.S. Plans only	Pension Benefits
For the Three Months Ended September 30,
(In millions)	2021		2020
Service cost	$	9	$	10
Interest cost	40		59
Expected return on plan assets	(126)		(126)
Recognized actuarial loss	30		22
Total credit	$	(47)	$	(35)

Significant non-U.S. Plans only	Pension Benefits
For the Nine Months Ended September 30,
(In millions)	2021		2020
Service cost	$	29	$	27
Interest cost	119		162
Expected return on plan assets	(382)		(370)
Recognized actuarial loss	88		66
Net periodic benefit credit	$	(146)	$	(115)
Settlement loss	2		—
Total credit	$	(144)	$	(115)

The weighted average actuarial assumptions utilized to calculate the net periodic benefit costs for the U.S. and significant non-U.S. defined benefit plans are as follows:

Combined U.S. and significant non-U.S. Plans	Pension Benefits
September 30,	2021		2020
Weighted average assumptions:
Expected return on plan assets	4.72	%	5.31	%
Discount rate	1.92	%	2.57	%
Rate of compensation increase	1.85	%	1.76	%

The Company made approximately $90 million of contributions to its U.S. and non-U.S. defined benefit pension plans for the nine months ended September 30, 2021. The Company expects to contribute approximately $39 million to its U.S. and non-U.S. defined benefit pension plans during the remainder of 2021.

Defined Contribution Plans

The Company maintains certain defined contribution plans ("DC Plans") for its employees, the most significant being in the U.S. and the U.K. The cost of the U.S. DC Plans was $115 million and $110 million for the nine months ended September 30, 2021 and 2020, respectively. The cost of the U.K. DC Plans was $106 million and $94 million for the nine months ended September 30, 2021 and 2020, respectively.

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Debt

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Debt

Debt

The Company’s outstanding debt is as follows:

(In millions)	September 30, 2021		December 31, 2020
Short-term:
Current portion of long-term debt	$	516	$	517
	516		517
Long-term:
Senior notes – 4.80% due 2021	—		500
Senior notes – 2.75% due 2022	500		499
Senior notes – 3.30% due 2023	349		349
Senior notes – 4.05% due 2023	249		249
Senior notes – 3.50% due 2024	598		598
Senior notes – 3.875% due 2024	996		995
Senior notes – 3.50% due 2025	498		498
Senior notes – 1.349% due 2026	647		677
Senior notes – 3.75% due 2026	598		597
Senior notes – 4.375% due 2029	1,499		1,499
Senior notes – 1.979% due 2030	632		664
Senior notes – 2.250% due 2030	738		737
Senior notes – 5.875% due 2033	298		298
Senior notes – 4.75% due 2039	495		495
Senior notes – 4.35% due 2047	493		493
Senior notes – 4.20% due 2048	592		592
Senior notes – 4.90% due 2049	1,238		1,237
Mortgage – 5.70% due 2035	320		331
Other	4		5
	10,744		11,313
Less current portion	516		517
	$	10,228	$	10,796

The senior notes in the table are registered by the Company with the Securities and Exchange Commission and are not guaranteed.

On April 9, 2021, the Company increased its short-term commercial paper financing program to $2.0 billion from $1.5 billion. The Company had no commercial paper outstanding at September 30, 2021.

Credit Facilities

On April 2, 2021, the Company entered into an amended and restated multi-currency unsecured $2.8 billion five-year revolving credit facility ("New Facility"). The interest rate on the New Facility is based on LIBOR plus a fixed margin which varies with the Company’s credit ratings. The New Facility expires in April 2026 and requires the Company to maintain certain coverage and leverage ratios which are tested quarterly. The New Facility includes provisions for determining a LIBOR successor rate in the event LIBOR reference rates are no longer available or in certain other circumstances which are determined to make using an alternative rate desirable. As of September 30, 2021, the Company had no borrowings under this facility.

In connection with the New Facility, the Company terminated its previous multi-currency unsecured $1.8 billion five-year revolving credit facility and its unsecured $1 billion 364-day unsecured revolving credit facility ("364-day Facility").

In January 2020, the Company closed on a $500 million one-year and $500 million two-year term loan facilities. In the first quarter of 2020 the Company borrowed $1 billion against these facilities, which were subsequently repaid during the third and fourth quarters of 2020. These two facilities were terminated as of December 31, 2020 after repayment of the initial draw down.

Additional credit facilities, guarantees and letters of credit are maintained with various banks, primarily related to operations located outside the United States, aggregating $512 million at September 30, 2021 and $573 million at December 31, 2020. There were no outstanding borrowings under these facilities at September 30, 2021 and December 31, 2020.

Senior Notes

On April 15, 2021, the Company repaid $500 million of senior notes maturing in July 2021.

In May 2020, the Company issued $750 million of senior notes due 2030.

In March 2020, the Company repaid $500 million of maturing senior notes.

Fair Value of Short-term and Long-term Debt

The following table reflects the carrying values and estimated fair value of the Company’s short-term and long-term debt. Certain estimates and judgments were required to develop the fair value amounts. The fair value amounts are not necessarily indicative of the amounts that the Company would realize upon disposition, nor do they indicate the Company’s intent or need to dispose of the financial instrument.

	September 30, 2021				December 31, 2020
(In millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Short-term debt	$	516	$	519	$	517	$	523
Long-term debt	$	10,228	$	11,878	$	10,796	$	12,858

The fair value of the Company's short-term debt consists primarily of term debt maturing within the next year and its fair value approximates its carrying value. The estimated fair value of the Company's long-term debt is based on discounted future cash flows using current interest rates available for debt with similar terms and remaining maturities. Short-term and long-term debt would be classified as Level 2 in the fair value hierarchy.

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Restructuring Costs

9 Months Ended

Sep. 30, 2021

Restructuring and Related Activities [Abstract]

Restructuring Costs

Restructuring Costs

Jardine Lloyd Thompson Group plc ("JLT") Related Integration and Restructuring

The Company is in the final stages of its integration of JLT, which the Company acquired in April 2019. The costs incurred in connection with the integration and restructuring of the combined businesses, primarily related to severance, real estate rationalization and technology, consulting fees related to the management of the integration processes and legal fees related to the rationalization of legal entity structures.

Since the acquisition of JLT, the Company has incurred JLT integration and restructuring costs of $647 million through September 30, 2021. This reflects $19 million and $61 million of costs incurred for the three and nine months ended September 30, 2021, respectively, compared to $44 million and $181 million, respectively, for the same periods in the prior year.

Costs recognized are based on applicable accounting guidance which includes accounting for disposal or exit activities, guidance related to impairment of long lived assets (for right of use assets related to real estate leases), as well as other costs resulting from accelerated depreciation or amortization of leasehold improvements and other property and equipment.

In connection with the JLT integration and restructuring, the Company incurred costs of $19 million and $61 million: $11 million and $38 million in RIS and $9 million and $21 million in Consulting for the three and nine months ended September 30, 2021, respectively. The severance and related costs were included in compensation and benefits and the other costs were included in other operating expenses in the consolidated statements of income.

Details of the JLT integration and restructuring activity from January 1, 2020 through September 30, 2021, are as follows:

(In millions)	Severance		Real Estate Related Costs (a)		Information Technology (a)		Consulting and Other Outside Services (b)		Total
Liability at 1/1/20	$	42	$	5	$	—	$	—	$	47
2020 charges	43		69		62		77		251
Cash payments	(69)		(25)		(55)		(77)		(226)
Non-cash charges	—		(42)		(5)		—		(47)
Liability at 12/31/20	$	16	$	7	$	2	$	—	$	25
2021 charges	9		19		15		18		61
Cash payments	(15)		(9)		(16)		(18)		(58)
Non-cash charges	—		(13)		—		—		(13)
Liability at 9/30/21	$	10	$	4	$	1	$	—	$	15

(a) Includes ROU asset impairments, data center contract termination costs and temporary infrastructure leasing costs.

(b) Includes consulting fees related to the management of the integration processes and legal fees related to the rationalization of legal entity structures.

Other Restructuring

The Company incurred costs of $12 million and $35 million for the three and nine months ended September 30, 2021 which reflect costs associated with the Company's global information technology and HR functions, and adjustments to restructuring liabilities for future rent under non-cancellable leases.

The following details other restructuring liabilities for actions initiated prior to 2021:

(In millions)	Liability at 1/1/20		Amounts Accrued		Cash Paid		Non-Cash/Other		Liability at 12/31/20		Amounts Accrued		Cash Paid		Non-Cash/Other		Liability at 9/30/21
Severance	$	51	$	39	$	(54)	$	—	$	36	$	13	$	(35)	$	—	$	14
Future rent under non-cancelable leases and other costs	51		50		(46)		(10)		45		22		(31)		(4)		32
Total	$	102	$	89	$	(100)	$	(10)	$	81	$	35	$	(66)	$	(4)	$	46

The expenses associated with these initiatives are included in compensation and benefits and other operating expenses in the consolidated statements of income. The liabilities associated with these initiatives are classified on the consolidated balance sheets as accounts payable and accrued liabilities, other liabilities or accrued compensation and employee benefits, depending on the nature of the items.

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Common Stock

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Common Stock

Common Stock

In November 2019, the Board of Directors of the Company authorized the Company to repurchase up to $2.5 billion in shares of the Company's common stock, which superseded any prior authorizations. During the first nine months of 2021, the Company repurchased 5.3 million shares of its common stock for $734 million. As of September 30, 2021, the Company remained authorized to repurchase up to approximately $1.7 billion in shares of its common stock. There is no time limit on the authorization. During the first nine months of 2020, there were no repurchases of the Company's common stock.

The Company issued approximately 3.1 million and 3.4 million shares related to stock compensation and employee stock purchase plans during the first nine months of 2021 and 2020, respectively.

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Claims, Lawsuits And Other Contingencies

9 Months Ended

Sep. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

Claims, Lawsuits and Other Contingencies

Claims, Lawsuits and Other Contingencies

Nature of Contingencies

The Company and its subsidiaries are subject to a significant number of claims, lawsuits and proceedings in the course of our business. Such claims and lawsuits consist principally of alleged errors and omissions in connection with the performance of professional services, including the placement of insurance, the provision of actuarial services for corporate and public sector clients, the provision of investment advice and investment management services to pension plans, the provision of advice relating to pension buy-out transactions and the provision of consulting services relating to the drafting and interpretation of trust deeds and other documentation governing pension plans. These claims often seek damages, including punitive and treble damages, in amounts that could be significant. In establishing liabilities for errors and omissions claims in accordance with FASB guidance on Contingencies - Loss Contingencies, the Company uses case level reviews by inside and outside counsel, and internal actuarial analysis by Oliver Wyman, a subsidiary of the Company, and other methods to estimate potential losses. A liability is established when a loss is both probable and reasonably estimable. The liability is reviewed quarterly and adjusted as developments warrant. In many cases, the Company has not recorded a liability, other than for legal fees to defend the claim, because we are unable, at the present time, to make a determination that a loss is both probable and reasonably estimable. To the extent that expected losses exceed our deductible in any policy year, the Company also records an asset for the amount that we expect to recover under any available third-party insurance programs. The Company has varying levels of third-party insurance coverage, with policy limits and coverage terms varying significantly by policy year.

Our activities are regulated under the laws of the United States and its various states, the United Kingdom, the European Union and its member states, and the many other jurisdictions in which the Company operates. 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.

Current Matters

Risk and Insurance Services Segment

•In January 2019, the Company received a notice that the Administrative Council for Economic Defense anti-trust agency in Brazil had commenced an administrative proceeding against a number of insurance brokers, including both Marsh and JLT, and insurers “to investigate an alleged sharing of sensitive commercial and competitive confidential information" in the aviation insurance and reinsurance sector.

•In 2017, JLT identified payments to a third-party introducer that had been directed to unapproved bank accounts. These payments related to reinsurance placements made on behalf of an Ecuadorian state-owned insurer between 2014 and 2017. In early 2018, JLT voluntarily reported this matter to law enforcement authorities. In February and March 2020, money laundering charges were filed in the United States against a former employee of JLT, the principals of the third-party introducer and a former official of the state-owned insurer. These individuals, including the former JLT employee, have since pleaded guilty to criminal charges. We are cooperating with all ongoing investigations related to this matter.

•From 2014, Marsh Ltd. was engaged by Greensill Capital (UK) Limited as its insurance broker. Marsh Ltd. placed a number of trade credit insurance policies for Greensill. On March 1, 2021, Greensill filed an action against certain of its trade credit insurers in Australia seeking a mandatory injunction compelling these insurers to renew coverage under expiring policies. Later that day, the Australian court denied Greensill’s application. Since then, a number of Greensill entities have filed for, or been subject to, insolvency proceedings, and several litigations and investigations have been commenced in the U.K., Australia, Germany, Switzerland and the U.S.

Consulting Segment

•In 2014, the FCA conducted an industry-wide review of the suitability of financial advice provided to individuals by a number of companies, including JLT, relating to enhanced transfer value ("ETV") defined benefit pension transfers. In January 2015, the FCA notified JLT that it was commissioning a Skilled Person review of ETV pension transfer advice given by JLT and a business acquired by JLT in 2012. Following the Skilled Person review which took place between 2015 and 2018, JLT engaged a compliance consulting firm to conduct an analysis of approximately 14,000 individual files to assess the suitability of the advice provided and, where appropriate, the amount of redress to be paid. In February 2019, prior to the completion of its acquisition by the Company, JLT recorded a gross liability of £59 million (or $77 million). This preliminary estimate by JLT, which reflected the projected redress amounts contained in the Skilled Person report, was based on a review of a limited number of files. Thereafter, the FCA expanded the scope

of the review. As of December 31, 2020, the updated redress liability, including the projected costs of completing the review, increased to £155 million (or $210 million) resulting from the expansion in the scope of the review, and the significant progress made in completing the individual suitability reviews. Payments of redress and expenses during the first three quarters of 2021, together with a reduction of the actuarial estimates of future redress payments, reduced the recorded liability to £25 million (or $34 million) as of September 30, 2021. We expect to finalize the suitability review and redress calculations and to make substantially all redress payments by the end of the fourth quarter of 2021. This gross liability has been, and we anticipate will continue to be, partially offset by a contractual indemnity obligation and insurance recoveries from third-party E&O insurers.

At this time, we are unable to predict the likely timing, outcome or ultimate impact of the foregoing matters. Adverse determinations in one or more of these matters could have a material impact on the Company's consolidated results of operations, financial condition or cash flows in a future period.

Other Contingencies-Guarantees

In connection with its acquisition of U.K.-based Sedgwick Group in 1998, the Company acquired several insurance underwriting businesses that were already in run-off, including River Thames Insurance Company Limited ("River Thames"), which the Company sold in 2001. Sedgwick guaranteed payment of claims on certain policies underwritten through the Institute of London Underwriters (the "ILU") by River Thames. The policies covered by this guarantee are partly reinsured by a related party of River Thames. Payment of claims under the reinsurance agreement is collateralized by funds withheld by River Thames from the reinsurer. To the extent River Thames or the reinsurer is unable to meet its obligations under those policies, a claimant may seek to recover from the Company under the guarantee.

From 1980 to 1983, the Company owned indirectly the English & American Insurance Company ("E&A"), which was a member of the ILU. The ILU required the Company to guarantee a portion of E&A's obligations. After E&A became insolvent in 1993, the ILU agreed to discharge the guarantee in exchange for the Company's agreement to post an evergreen letter of credit that is available to pay claims by policyholders on certain E&A policies issued through the ILU and incepting between July 3, 1980 and October 6, 1983. Certain claims have been paid under the letter of credit and the Company anticipates that additional claimants may seek to recover against the letter of credit.

* * * *

The pending proceedings described above and other matters not explicitly described in this Note 17 on Claims, Lawsuits and Other Contingencies may expose the Company or its subsidiaries to liability for significant monetary damages, fines, penalties or other forms of relief. Where a loss is both probable and reasonably estimable, the Company establishes liabilities in accordance with FASB guidance on Contingencies - Loss Contingencies. Except as described above, the Company is not able at this time to provide a reasonable estimate of the range of possible loss attributable to these matters or the impact they may have on the Company's consolidated results of operations, financial position or cash flows. This is primarily because these matters are still developing and involve complex issues subject to inherent uncertainty. Adverse determinations in one or more of these matters could have a material impact on the Company's consolidated results of operations, financial condition or cash flows in a future period.

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Segment Information

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Segment Information

Segment Information

The Company is organized based on the types of services provided. Under this structure, the Company’s segments are:

•Risk and Insurance Services, comprising insurance services (Marsh) and reinsurance services (Guy Carpenter); and

•Consulting, comprising Mercer and Oliver Wyman Group.

The accounting policies of the segments are the same as those used for the consolidated financial statements described in Note 1 to the Company’s 2020 Form 10-K. Segment performance is evaluated based on segment operating income, which includes directly related expenses, and charges or credits related to integration and restructuring but not the Company’s corporate-level expenses. Revenues are attributed to geographic areas on the basis of where the services are performed.

Selected information about the Company’s operating segments for the three and nine month periods ended September 30, 2021 and 2020 are as follows:

	Three Months Ended September 30,					Nine Months Ended September 30,
(In millions)	Revenue			Operating Income (Loss)		Revenue			Operating Income (Loss)
2021–
Risk and Insurance Services	$	2,670	(a)	$	403	$	9,036	(c)	$	2,413
Consulting	1,925		(b)	404		5,690		(d)	1,109
Total Operating Segments	4,595			807		14,726			3,522
Corporate/Eliminations	(12)			(67)		(43)			(196)
Total Consolidated	$	4,583		$	740	$	14,683		$	3,326
2020–
Risk and Insurance Services	$	2,291	(a)	$	333	$	7,805	(c)	$	1,883
Consulting	1,696		(b)	278		5,074		(d)	815
Total Operating Segments	3,987			611		12,879			2,698
Corporate/Eliminations	(19)			(71)		(71)			(203)
Total Consolidated	$	3,968		$	540	$	12,808		$	2,495

(a) Includes interest income on fiduciary funds of $4 million and $8 million in 2021 and 2020, respectively, and equity method income of $8 million in 2021 and equity method loss of $6 million in 2020.

(b) Includes inter-segment revenue of $11 million and $19 million in 2021 and 2020, respectively.

(c) Includes inter-segment revenue of $5 million for both 2021 and 2020, interest income on fiduciary funds of $12 million and $40 million in 2021 and 2020, respectively, and equity method income of $25 million and $7 million in 2021 and 2020, respectively.

(d) Includes inter-segment revenue of $38 million and $66 million in 2021 and 2020, respectively, and equity method income of $4 million in 2020 and none in 2021.

Details of operating segment revenue for the three and nine month periods ended September 30, 2021 and 2020 are as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2021		2020		2021		2020
Risk and Insurance Services
Marsh	$	2,355	$	2,015	$	7,336	$	6,259
Guy Carpenter	315		276		1,700		1,546
Total Risk and Insurance Services	2,670		2,291		9,036		7,805
Consulting
Mercer	1,315		1,216		3,877		3,616
Oliver Wyman Group	610		480		1,813		1,458
Total Consulting	1,925		1,696		5,690		5,074
Total Operating Segments	4,595		3,987		14,726		12,879
Corporate/Eliminations	(12)		(19)		(43)		(71)
Total	$	4,583	$	3,968	$	14,683	$	12,808

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New Accounting Guidance

9 Months Ended

Sep. 30, 2021

Accounting Standards Update and Change in Accounting Principle [Abstract]

New Accounting Guidance

New Accounting Guidance

New Accounting Pronouncements Adopted Effective January 1, 2021:

In January 2020, the FASB issued guidance that addresses accounting for the transition into and out of the equity method and measuring certain purchased options and forward contracts to acquire investments. The standard takes effect for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. The adoption of this standard did not have a material impact on the Company’s financial position or its results of operations.

In December 2019, the FASB issued guidance related to the accounting for income taxes. The standard removes specific exceptions in the current rules and eliminates the need for an organization to analyze whether the following apply in a given period: (a) exception to the incremental approach for intraperiod tax allocation; (b) exceptions to accounting for basis differences when there are ownership changes in foreign investments and (c) exception in interim period income tax accounting for year-to-date losses that exceed anticipated losses. The standard also is designed to improve financial statement preparers’ application of income tax-related guidance and simplify GAAP for (a) franchise taxes that are partially based on income; (b) transactions with a government that result in a step-up in the tax basis of goodwill; (c) separate financial statements of legal entities that are not subject to tax and (d) enacted changes in tax laws in interim periods. The standard takes effect for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. The adoption of this standard did not have a material impact on the Company’s financial position or its results of operations.

New Accounting Pronouncements Adopted Effective January 1, 2020:

In August 2018, the FASB issued new guidance that amends required fair value measurement disclosures. The guidance adds new requirements, eliminates some current disclosures and modifies other required disclosures. The new disclosure requirements, along with modifications made to disclosures as a result of the change in requirements for narrative descriptions of measurement uncertainty, must be applied on a prospective basis. The effects of all other amendments included in the guidance must be applied retrospectively for all periods presented. The adoption of this guidance impacted disclosures only and did not have an impact on the Company's financial position or results of operations.

In January 2017, the FASB issued new guidance to simplify the test for goodwill impairment. The new guidance eliminates the second step in the current two-step goodwill impairment process, under which a goodwill impairment loss is measured by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill for that reporting unit. The new guidance requires a one-step impairment test, in which the goodwill impairment charge is based on the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The guidance should be applied on a prospective basis with the nature of and reason

for the change in accounting principle disclosed upon transition. The adoption of this standard did not have an impact on the Company's financial position or results of operations.

In June 2016, the FASB issued new guidance on the impairment of financial instruments. The new guidance adds an allowance for credit losses ("CECL") impairment model that is based on expected losses rather than incurred losses. Under the new guidance, an entity recognizes as an allowance its estimate of lifetime expected credit losses, which the FASB believes will result in more timely recognition of such losses. The new standard is also intended to reduce the complexity of U.S. GAAP by decreasing the number of credit impairment models that entities use to account for debt instruments. Further, the new standard makes targeted changes to the impairment model for available-for-sale debt securities. The adoption of this standard did not have a material impact on the Company’s financial position or results of operations.

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Principles of Consolidation and Other Matters (Policies)

9 Months Ended

Sep. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Cash and Cash Equivalents

Cash and cash equivalents primarily consist of certificates of deposit and time deposits, with original maturities of three months or less, and money market funds. The estimated fair value of the Company's cash and cash equivalents approximates their carrying value. The Company is required to maintain operating funds primarily related to regulatory requirements outside of the United States or as collateral under captive insurance arrangements.

Allowance for Credit Losses on Accounts Receivable

The Company’s policy for providing an allowance for credit losses on its accounts receivable is based on a combination of factors, including historical write-offs, aging of balances, and other qualitative and quantitative analyses.

Investments

The caption "Investment income (loss)" in the consolidated statements of income comprises realized and unrealized gains and losses from investments recognized in earnings. It includes, when applicable, other than temporary declines in the value of securities, mark-to-market increases or decreases in equity investments with readily determinable fair values and equity method gains or losses on the Company's investments in private equity funds.

The Company holds investments in certain private equity funds that are accounted for in accordance with the equity method of accounting using a consistently applied three-month lag period adjusted for any known significant changes from the lag period to the reporting date of the Company. The underlying private equity funds follow investment company accounting, where investments within the fund are carried at fair value. Investment gains or losses for the Company's proportionate share of the change in fair value of the funds are recorded in earnings. Investments accounted for using the equity method of accounting are included in "other assets" in the consolidated balance sheets.

Income Taxes

The Company's effective tax rate in the third quarter of 2021 was 24.2% compared with 30.3% in the third quarter of 2020. The effective tax rates for the nine months ended September 30, 2021 and 2020 were 27.1% and 26.0%, respectively.

The rate in the third quarter of 2021 reflects tax benefits from planning implemented in the period that postponed the utilization of current-year losses in the U.K. to a future year when the tax rate will be 25%, additional tax benefits related to share-based compensation offset by changes to uncertain tax positions, deferred tax and other tax adjustments. The rate in the nine months ended September 30, 2021 reflects the charge recorded in the second quarter of approximately $100 million to re-measure the Company’s U.K. deferred tax assets and liabilities upon the enactment of legislation on June 10, 2021, commonly referred to as the "Finance Act 2021". The legislation increased the U.K. corporate income tax rate from 19% to 25% effective April 1, 2023. This is the most significant discrete item in the year-to-date period, increasing the Company’s effective tax rate by 3.1% for the nine months ended September 30, 2021.

The rate in the third quarter and nine months ended September 30, 2020 reflects costs of re-measuring the Company’s U.K. deferred tax assets and liabilities upon the enactment of legislation that cancelled a scheduled 2% reduction in the U.K. corporate income tax rate, partially offset by tax benefits for the implementation of a new international funding structure to facilitate global staffing and contracting.

The tax rates in both periods reflect the impact of discrete tax items such as excess tax benefits related to share-based compensation, enacted tax legislation, changes in uncertain tax positions, deferred tax adjustments and nontaxable adjustments to contingent acquisition consideration.

The Company's tax rate reflects its income, statutory tax rates, and tax planning in the various jurisdictions in which it operates. Significant judgment is required in determining the annual effective tax rate and in evaluating uncertain tax positions.

Losses in one jurisdiction, generally, cannot offset earnings in another, and within certain jurisdictions profits and losses may not offset between entities. Consequently, losses in certain jurisdictions may require valuation allowances affecting the effective tax rate, depending on estimates of the realizability of associated deferred tax assets. The tax rate is also sensitive to changes in unrecognized tax benefits, including the impact of settled tax audits and expired statutes of limitation.

Changes in tax laws or tax rulings may have a significant impact on our effective tax rate. The Company reports a liability for unrecognized tax benefits resulting from uncertain tax positions taken or expected to be taken in tax returns. The Company's gross unrecognized tax benefits was $101 million at September 30, 2021 and $98 million at December 31, 2020. It is reasonably possible that the total amount of unrecognized tax benefits will decrease between zero and approximately $33 million within the next twelve months due to settlements of audits and expirations of statutes of limitation.

Integration and Restructuring Charges

Severance and related costs are recognized based on amounts due under established severance plans or estimates of one-time benefits that will be provided. Typically, severance benefits are recognized when the impacted colleagues are notified of their expected termination and such termination is expected to occur within the legally required notification period. These costs are included in compensation and benefits in the consolidated statements of income.

Costs for real estate consolidation are recognized based on the type of cost, and the expected future use of the facility. For locations where the Company does not expect to sub-lease the property, the amortization of any right-of-use asset is accelerated from the decision date to the cease use date. For locations where the Company expects to sub-lease the properties subsequent to its vacating the property, the right-of-use asset is reviewed for potential impairment at the earlier of the cease use date or the date a sub-lease is signed. To determine the amount of impairment, the fair value of the right-of-use asset is determined based on the present value of the estimated net cash flows related to the property. Contractual costs outside of the right-of-use asset are recognized based on the net present value of expected future cash outflows for which the Company will not receive any benefit. Such

amounts are based on estimates of future sub-lease income to be received and future contractual costs to be incurred. These costs are included in other operating expenses in the consolidated statements of income.

Other costs related to integration and restructuring, such as moving, legal or consulting costs are recognized as incurred. These costs are included in other operating expenses in the consolidated statements of income.

Fair Value Measurement

Fair Value Hierarchy

The Company has categorized its assets and liabilities that are valued at fair value on a recurring basis into a three-level fair value hierarchy as defined by the FASB. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets and liabilities (Level 1) and lowest priority to unobservable inputs (Level 3). In some cases, the inputs used to measure fair value might fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy, for disclosure purposes, is determined based on the lowest level input that is significant to the fair value measurement. Assets and liabilities recorded in the consolidated balance sheets at fair value are categorized based on the inputs in the valuation techniques as follows:

Level 1.Assets and liabilities whose values are based on unadjusted quoted prices for identical assets or liabilities in an active market (examples include active exchange-traded equity securities and exchange-traded money market mutual funds).

Assets and liabilities measured using Level 1 inputs include exchange-traded equity securities, exchange-traded mutual funds and money market funds.

Level 2.Assets and liabilities whose values are based on the following:

a)Quoted prices for similar assets or liabilities in active markets;

b)Quoted prices for identical or similar assets or liabilities in non-active markets (examples include corporate and municipal bonds, which trade infrequently);

c)Pricing models whose inputs are observable for substantially the full term of the asset or liability (examples include most over-the-counter derivatives, including interest rate and currency swaps); and

d)Pricing models whose inputs are derived principally from or corroborated by observable market data through correlation or other means for substantially the full asset or liability (for example, certain mortgage loans).

Assets and liabilities using Level 2 inputs are related to an equity security.

Level 3.Assets and liabilities whose values are based on prices, or valuation techniques that require inputs that are both unobservable and significant to the overall fair value measurement. These inputs reflect management’s own assumptions about the assumptions a market participant would use in pricing the asset or liability.

Assets and liabilities measured using Level 3 inputs relate to assets and liabilities for contingent purchase consideration.

Valuation Techniques

Equity Securities, Money Market Mutual Funds and Mutual Funds – Level 1

Investments for which market quotations are readily available are valued at the sale price on their principal exchange or, for certain markets, official closing bid price. Money market mutual funds are valued using a valuation technique that results in price per share at $1.00.

Contingent Purchase Consideration Assets and Liabilities – Level 3

Purchase consideration for some acquisitions and dispositions made by the Company include contingent consideration arrangements. Contingent consideration arrangements are based primarily on EBITDA or revenue targets over a period of two to four years. The fair value of the contingent purchase consideration asset and liability is estimated as the present value of future cash flows to be paid, based on projections of revenue and earnings and related targets of the acquired and disposed entities.

New Accounting Pronouncements

New Accounting Guidance

New Accounting Pronouncements Adopted Effective January 1, 2021:

In January 2020, the FASB issued guidance that addresses accounting for the transition into and out of the equity method and measuring certain purchased options and forward contracts to acquire investments. The standard takes effect for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. The adoption of this standard did not have a material impact on the Company’s financial position or its results of operations.

In December 2019, the FASB issued guidance related to the accounting for income taxes. The standard removes specific exceptions in the current rules and eliminates the need for an organization to analyze whether the following apply in a given period: (a) exception to the incremental approach for intraperiod tax allocation; (b) exceptions to accounting for basis differences when there are ownership changes in foreign investments and (c) exception in interim period income tax accounting for year-to-date losses that exceed anticipated losses. The standard also is designed to improve financial statement preparers’ application of income tax-related guidance and simplify GAAP for (a) franchise taxes that are partially based on income; (b) transactions with a government that result in a step-up in the tax basis of goodwill; (c) separate financial statements of legal entities that are not subject to tax and (d) enacted changes in tax laws in interim periods. The standard takes effect for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. The adoption of this standard did not have a material impact on the Company’s financial position or its results of operations.

New Accounting Pronouncements Adopted Effective January 1, 2020:

In August 2018, the FASB issued new guidance that amends required fair value measurement disclosures. The guidance adds new requirements, eliminates some current disclosures and modifies other required disclosures. The new disclosure requirements, along with modifications made to disclosures as a result of the change in requirements for narrative descriptions of measurement uncertainty, must be applied on a prospective basis. The effects of all other amendments included in the guidance must be applied retrospectively for all periods presented. The adoption of this guidance impacted disclosures only and did not have an impact on the Company's financial position or results of operations.

In January 2017, the FASB issued new guidance to simplify the test for goodwill impairment. The new guidance eliminates the second step in the current two-step goodwill impairment process, under which a goodwill impairment loss is measured by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill for that reporting unit. The new guidance requires a one-step impairment test, in which the goodwill impairment charge is based on the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The guidance should be applied on a prospective basis with the nature of and reason

for the change in accounting principle disclosed upon transition. The adoption of this standard did not have an impact on the Company's financial position or results of operations.

In June 2016, the FASB issued new guidance on the impairment of financial instruments. The new guidance adds an allowance for credit losses ("CECL") impairment model that is based on expected losses rather than incurred losses. Under the new guidance, an entity recognizes as an allowance its estimate of lifetime expected credit losses, which the FASB believes will result in more timely recognition of such losses. The new standard is also intended to reduce the complexity of U.S. GAAP by decreasing the number of credit impairment models that entities use to account for debt instruments. Further, the new standard makes targeted changes to the impairment model for available-for-sale debt securities. The adoption of this standard did not have a material impact on the Company’s financial position or results of operations.

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Revenue (Tables)

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following schedule disaggregates components of the Company's revenue:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2021		2020		2021		2020
Marsh:
EMEA	$	600	$	536	$	2,233	$	1,887
Asia Pacific	281		254		902		790
Latin America	105		93		298		283
Total International	986		883		3,433		2,960
U.S./Canada	1,366		1,126		3,894		3,271
Total Marsh	2,352		2,009		7,327		6,231
Guy Carpenter	314		274		1,697		1,534
Subtotal	2,666		2,283		9,024		7,765
Fiduciary interest income	4		8		12		40
Total Risk and Insurance Services	$	2,670	$	2,291	$	9,036	$	7,805
Mercer:
Wealth	$	613	$	566	$	1,861	$	1,719
Health	449		430		1,398		1,348
Career	253		220		618		549
Total Mercer	1,315		1,216		3,877		3,616
Oliver Wyman Group	610		480		1,813		1,458
Total Consulting	$	1,925	$	1,696	$	5,690	$	5,074

Contract with Customer, Asset and Liability

The following schedule provides contract assets and contract liabilities information from contracts with customers:

(In millions)	September 30, 2021		December 31, 2020
Contract assets	$	307	$	236
Contract liabilities	$	738	$	676

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Per Share Data (Tables)

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Basic and Diluted EPS Calculation

Basic and Diluted EPS Calculation	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions, except per share data)	2021		2020		2021		2020
Net income before non-controlling interests	$	542	$	320	$	2,367	$	1,667
Less: Net income attributable to non-controlling interests	5		4		27		25
Net income attributable to the Company	$	537	$	316	$	2,340	$	1,642
Basic weighted average common shares outstanding	506		507		508		506
Dilutive effect of potentially issuable common shares	7		5		5		5
Diluted weighted average common shares outstanding	513		512		513		511
Average stock price used to calculate common stock equivalents	$	151.22	$	114.64	$	133.41	$	107.64

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Supplemental Disclosures to the Consolidated Statements of Cash Flows (Tables)

9 Months Ended

Sep. 30, 2021

Supplemental Cash Flow Information [Abstract]

Additional Information Concerning Acquisitions, Interest and Income Taxes Paid

The following schedule provides additional information concerning acquisitions, interest and income taxes paid for the nine month periods ended September 30, 2021 and 2020.

(In millions)	2021		2020
Assets acquired, excluding cash	$	601	$	795
Liabilities assumed	(59)		(73)
Contingent/deferred purchase consideration	(141)		(163)
Net cash outflow for current year acquisitions	$	401	$	559

(In millions)	2021		2020
Interest paid	$	407	$	437
Income taxes paid, net of refunds	$	686	$	414

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Other Comprehensive Income (Loss) (Tables)

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The changes, net of tax, in the balances of each component of Accumulated Other Comprehensive Income ("AOCI") for the three and nine months ended September 30, 2021 and 2020, including amounts reclassified out of AOCI, are as follows:

(In millions)	Pension/Post-Retirement Plans Gains (Losses)		Foreign Currency Translation Gains (Losses)		Total Gains (Losses)
Balance as of July 1, 2021	$	(4,102)	$	(1,051)	$	(5,153)
Other comprehensive income (loss) before reclassifications	115		(346)		(231)
Amounts reclassified from accumulated other comprehensive income	39		—		39
Net current period other comprehensive income (loss)	154		(346)		(192)
Balance as of September 30, 2021	$	(3,948)	$	(1,397)	$	(5,345)

(In millions)	Pension/Post-Retirement Plans Gains (Losses)		Foreign Currency Translation Gains (Losses)		Total Gains (Losses)
Balance as of July 1, 2020	$	(3,346)	$	(2,236)	$	(5,582)
Other comprehensive (loss) income before reclassifications	(94)		497		403
Amounts reclassified from accumulated other comprehensive income	31		—		31
Net current period other comprehensive (loss) income	(63)		497		434
Balance as of September 30, 2020	$	(3,409)	$	(1,739)	$	(5,148)

(In millions)	Pension/Post-Retirement Plans Gains (Losses)		Foreign Currency Translation Gains (Losses)		Total Gains (Losses)
Balance as of December 31, 2020	$	(4,126)	$	(984)	$	(5,110)
Other comprehensive income (loss) before reclassifications	63		(413)		(350)
Amounts reclassified from accumulated other comprehensive income	115		—		115
Net current period other comprehensive income (loss)	178		(413)		(235)
Balance as of September 30, 2021	$	(3,948)	$	(1,397)	$	(5,345)

(In millions)	Pension/Post-Retirement Plans Gains (Losses)		Foreign Currency Translation Gains (Losses)		Total Gains (Losses)
Balance as of December 31, 2019	$	(3,512)	$	(1,543)	$	(5,055)
Other comprehensive income (loss) before reclassifications	12		(196)		(184)
Amounts reclassified from accumulated other comprehensive income	91		—		91
Net current period other comprehensive income (loss)	103		(196)		(93)
Balance as of September 30, 2020	$	(3,409)	$	(1,739)	$	(5,148)

Schedule of Components of Comprehensive Income (Loss)

The components of other comprehensive income (loss) for the three and nine month periods ended September 30, 2021 and 2020 are as follows:

Three Months Ended September 30,	2021						2020
(In millions)	Pre-Tax		Tax (Credit)		Net of Tax		Pre-Tax		Tax (Credit)		Net of Tax
Foreign currency translation adjustments	$	(346)	$	—	$	(346)	$	500	$	3	$	497
Pension/post-retirement plans:
Amortization of gains included in net periodic pension cost:
Net actuarial losses (a)	52		13		39		40		9		31
Subtotal	52		13		39		40		9		31
Foreign currency translation adjustments	88		21		67		(113)		(19)		(94)
Effect of remeasurement	64		16		48		—		—		—
Pension/post-retirement plans gains (losses)	204		50		154		(73)		(10)		(63)
Other comprehensive (loss) income	$	(142)	$	50	$	(192)	$	427	$	(7)	$	434
(a) Components of net periodic pension cost are included in other net benefit credits in the consolidated statements of income. Income tax expense on net actuarial losses are included in income tax expense.

Nine Months Ended September 30,	2021						2020
(In millions)	Pre-Tax		Tax (Credit)		Net of Tax		Pre-Tax		Tax (Credit)		Net of Tax
Foreign currency translation adjustments	$	(413)	$	—	$	(413)	$	(200)	$	(4)	$	(196)
Pension/post-retirement plans:
Amortization of (gains) losses included in net periodic pension cost:
Prior service credits (a)	(1)		—		(1)		(1)		—		(1)
Net actuarial losses (a)	156		40		116		120		28		92
Subtotal	155		40		115		119		28		91
Foreign currency translation adjustments	7		1		6		17		5		12
Other adjustments	(7)		(2)		(5)		—		—		—
Effect of remeasurement	77		17		60		—		—		—
Effect of settlement	2		—		2		—		—		—
Pension/post-retirement plans gains	234		56		178		136		33		103
Other comprehensive (loss) income	$	(179)	$	56	$	(235)	$	(64)	$	29	$	(93)
(a) Components of net periodic pension cost are included in other net benefit credits in the consolidated statements of income. Income tax expense on net actuarial losses are included in income tax expense.

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Acquisitions and Dispositions (Tables)

9 Months Ended

Sep. 30, 2021

Business Combination and Asset Acquisition [Abstract]

Schedule For Allocation of Acquisition Costs

The following table presents the preliminary allocation of purchase consideration to the assets acquired and liabilities assumed during 2021 based on the estimated fair values for the acquisitions as of their respective acquisition dates:

Acquisitions through September 30, 2021
(In millions)
Cash	$	405
Estimated fair value of deferred/contingent consideration	141
Total consideration	$	546
Allocation of purchase price:
Cash and cash equivalents	$	4
Accounts receivable, net	32
Fixed assets, net	5
Other intangible assets	190
Goodwill	374
Total assets acquired	605
Current liabilities	27
Other liabilities	32
Total liabilities assumed	59
Net assets acquired	$	546

Schedule of Acquired Finite-Lived Intangible Assets by Major Class

The following chart provides information about intangible assets acquired during 2021:

Intangible assets through September 30, 2021 (In millions)	Amount		Weighted Average Amortization Period
Client relationships	$	176	13.7 years
Other	14		3.8 years
	$	190

Pro-Forma Information

The following unaudited pro-forma financial data gives effect to the acquisitions made by the Company during 2021 and 2020. In accordance with accounting guidance related to pro-forma disclosures, the information presented for acquisitions made in 2021 is as if they occurred on January 1, 2020 and reflects acquisitions made in 2020 as if they occurred on January 1, 2019. The unaudited pro-forma information adjusts for the effects of amortization of

acquired intangibles. The unaudited pro-forma financial data is presented for illustrative purposes only and is not necessarily indicative of the operating results that would have been achieved if such acquisitions had occurred on the dates indicated, nor is it necessarily indicative of future consolidated results.

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions, except per share data)	2021		2020		2021		2020
Revenue	$	4,587	$	4,019	$	14,730	$	12,955
Net income attributable to the Company	$	538	$	322	$	2,345	$	1,655
Basic net income per share attributable to the Company	$	1.06	$	0.63	$	4.62	$	3.27
Diluted net income per share attributable to the Company	$	1.05	$	0.63	$	4.57	$	3.24

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Goodwill and Other Intangibles (Tables)

9 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the Carrying Amount of Goodwill

Changes in the carrying amount of goodwill are as follows:

September 30,
(In millions)	2021		2020
Balance as of January 1,	$	15,517	$	14,671
Goodwill acquired	374		462
Other adjustments(a)	(243)		(99)
Balance at September 30,	$	15,648	$	15,034

(a) Primarily reflects the impact of foreign exchange.

Amortized Intangible Assets

The gross cost and accumulated amortization of identified intangible assets at September 30, 2021 and December 31, 2020 are as follows:

	September 30, 2021						December 31, 2020
(In millions)	Gross Cost		Accumulated Amortization		Net Carrying Amount		Gross Cost		Accumulated Amortization		Net Carrying Amount
Client relationships	$	3,827	$	1,331	$	2,496	$	3,713	$	1,170	$	2,543
Other (a)	367		276		91		386		230		156
Amortized intangibles	$	4,194	$	1,607	$	2,587	$	4,099	$	1,400	$	2,699

(a) Primarily non-compete agreements, trade names and developed technology.

Estimated Future Aggregate Amortization Expense

The estimated future aggregate amortization expense is as follows:

For the Years Ending December 31,
(In millions)	Estimated Expense
2021 (excludes amortization through September 30, 2021)	$	88
2022	329
2023	302
2024	281
2025	241
Subsequent years	1,346
Total future amortization	$	2,587

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following fair value hierarchy table presents information about the Company’s assets and liabilities measured at fair value on a recurring basis as of September 30, 2021 and December 31, 2020:

	Identical Assets (Level 1)				Observable Inputs (Level 2)				Unobservable Inputs (Level 3)				Total
(In millions)	09/30/21		12/31/20		09/30/21		12/31/20		09/30/21		12/31/20		09/30/21		12/31/20
Assets:
Financial instruments owned:
Exchange traded equity securities(a)	$	60	$	59	$	—	$	—	$	—	$	—	$	60	$	59
Mutual funds(a)	193		186		—		—		—		—		193		186
Money market funds(b)	106		587		—		—		—		—		106		587
Other equity investment(a)	—		—		8		8		—		—		8		8
Contingent purchase consideration assets(c)	—		—		—		—		5		68		5		68
Total assets measured at fair value	$	359	$	832	$	8	$	8	$	5	$	68	$	372	$	908
Fiduciary Assets:
U.S. treasury bills	$	75	$	150	$	—	$	—	$	—	$	—	$	75	$	150
Money market funds	244		173		—		—		—		—		244		173
Total fiduciary assets measured at fair value	$	319	$	323	$	—	$	—	$	—	$	—	$	319	$	323
Liabilities:
Contingent purchase consideration liability(d)	$	—	$	—	$	—	$	—	$	303	$	243	$	303	$	243
Total liabilities measured at fair value	$	—	$	—	$	—	$	—	$	303	$	243	$	303	$	243

(a) Included in other assets in the consolidated balance sheets.

(b) Included in cash and cash equivalents in the consolidated balance sheets.

(c) Included in other receivables in the consolidated balance sheets.

(d) Included in accounts payable and accrued liabilities and other liabilities in the consolidated balance sheets.

Changes in Fair Value of Level 3 Liabilities Representing Acquisition Related Contingent Consideration

The following table sets forth a summary of the changes in fair value of the Company’s Level 3 liabilities for the three and nine month periods ended September 30, 2021 and 2020:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2021		2020		2021		2020
Balance at beginning of period	$	340	$	233	$	243	$	225
Net additions	1		—		99		96
Payments	(54)		(23)		(72)		(101)
Revaluation impact	18		18		35		8
Other (a)	(2)		2		(2)		2
Balance at September 30,	$	303	$	230	$	303	$	230

(a) Primarily reflects the impact of foreign exchange.

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Leases (Tables)

9 Months Ended

Sep. 30, 2021

Leases [Abstract]

Lease Cost and Additional Information

The following chart provides additional information about the Company’s property leases:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2021		2020		2021		2020
Lease Cost:
Operating lease cost	$	93	$	99	$	282	$	288
Short-term lease cost	1		1		4		3
Variable lease cost	38		28		101		92
Sublease income	(3)		(5)		(16)		(15)
Net lease cost	$	129	$	123	$	371	$	368
Other information:
Operating cash outflows from operating leases					$	310	$	306
Right of use assets obtained in exchange for new operating lease liabilities					$	282	$	162
Weighted-average remaining lease term – real estate					9.0 years		8.4 years
Weighted-average discount rate – real estate leases					2.75%		3.02%

Future Minimum Lease Payments for Operating Leases

Future minimum lease payments for the Company’s operating leases as of September 30, 2021 are as follows:

Payment Dates (In millions)	Real Estate Leases
Remainder of 2021	$	102
2022	387
2023	340
2024	298
2025	266
2026	243
Subsequent years	897
Total future lease payments	2,533
Less: Imputed interest	(294)
Total	$	2,239
Current lease liabilities	$	339
Long-term lease liabilities	1,900
Total lease liabilities	$	2,239

Note: Table excludes obligations for leases with original terms of 12 months or less which have not been recognized as a right of use asset or liability in the consolidated balance sheets.

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Retirement Benefits (Tables)

9 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

The components of the net periodic benefit cost for defined benefit plans are as follows:

Combined U.S. and significant non-U.S. Plans	Pension Benefits
For the Three Months Ended September 30,
(In millions)	2021		2020
Service cost	$	9	$	10
Interest cost	87		112
Expected return on plan assets	(208)		(212)
Recognized actuarial loss	52		40
Total credit	$	(60)	$	(50)
Combined U.S. and significant non-U.S. Plans	Pension Benefits
For the Nine Months Ended September 30,
(In millions)	2021		2020
Service cost	$	29	$	27
Interest cost	258		322
Expected return on plan assets	(627)		(629)
Recognized actuarial loss	155		120
Net periodic benefit credit	$	(185)	$	(160)
Settlement loss	2		—
Total credit	$	(183)	$	(160)

Amounts Recorded in the Consolidated Statement of Income
Combined U.S. and significant non-U.S. Plans	Pension Benefits
For the Three Months Ended September 30,
(In millions)	2021		2020
Compensation and benefits expense	$	9	$	10
Other net benefit credit	(69)		(60)
Total credit	$	(60)	$	(50)

Amounts Recorded in the Consolidated Statement of Income
Combined U.S. and significant non-U.S. Plans	Pension Benefits
For the Nine Months Ended September 30,
(In millions)	2021		2020
Compensation and benefits expense	$	29	$	27
Other net benefit credit	(212)		(187)
Total credit	$	(183)	$	(160)

U.S. Plans only	Pension Benefits
For the Three Months Ended September 30,
(In millions)	2021		2020
Interest cost	$	47	$	53
Expected return on plan assets	(82)		(86)
Recognized actuarial loss	22		18
Net periodic benefit credit	$	(13)	$	(15)

U.S. Plans only	Pension Benefits
For the Nine Months Ended September 30,
(In millions)	2021		2020
Interest cost	$	139	$	160
Expected return on plan assets	(245)		(259)
Recognized actuarial loss	67		54
Net periodic benefit credit	$	(39)	$	(45)

Significant non-U.S. Plans only	Pension Benefits
For the Three Months Ended September 30,
(In millions)	2021		2020
Service cost	$	9	$	10
Interest cost	40		59
Expected return on plan assets	(126)		(126)
Recognized actuarial loss	30		22
Total credit	$	(47)	$	(35)

Significant non-U.S. Plans only	Pension Benefits
For the Nine Months Ended September 30,
(In millions)	2021		2020
Service cost	$	29	$	27
Interest cost	119		162
Expected return on plan assets	(382)		(370)
Recognized actuarial loss	88		66
Net periodic benefit credit	$	(146)	$	(115)
Settlement loss	2		—
Total credit	$	(144)	$	(115)

Schedule of Assumptions Used

The weighted average actuarial assumptions utilized to calculate the net periodic benefit costs for the U.S. and significant non-U.S. defined benefit plans are as follows:

Combined U.S. and significant non-U.S. Plans	Pension Benefits
September 30,	2021		2020
Weighted average assumptions:
Expected return on plan assets	4.72	%	5.31	%
Discount rate	1.92	%	2.57	%
Rate of compensation increase	1.85	%	1.76	%

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Debt (Tables)

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Schedule of Outstanding Debt

The Company’s outstanding debt is as follows:

(In millions)	September 30, 2021		December 31, 2020
Short-term:
Current portion of long-term debt	$	516	$	517
	516		517
Long-term:
Senior notes – 4.80% due 2021	—		500
Senior notes – 2.75% due 2022	500		499
Senior notes – 3.30% due 2023	349		349
Senior notes – 4.05% due 2023	249		249
Senior notes – 3.50% due 2024	598		598
Senior notes – 3.875% due 2024	996		995
Senior notes – 3.50% due 2025	498		498
Senior notes – 1.349% due 2026	647		677
Senior notes – 3.75% due 2026	598		597
Senior notes – 4.375% due 2029	1,499		1,499
Senior notes – 1.979% due 2030	632		664
Senior notes – 2.250% due 2030	738		737
Senior notes – 5.875% due 2033	298		298
Senior notes – 4.75% due 2039	495		495
Senior notes – 4.35% due 2047	493		493
Senior notes – 4.20% due 2048	592		592
Senior notes – 4.90% due 2049	1,238		1,237
Mortgage – 5.70% due 2035	320		331
Other	4		5
	10,744		11,313
Less current portion	516		517
	$	10,228	$	10,796

Estimated Fair Value Of Significant Financial Instruments

The following table reflects the carrying values and estimated fair value of the Company’s short-term and long-term debt. Certain estimates and judgments were required to develop the fair value amounts. The fair value amounts are not necessarily indicative of the amounts that the Company would realize upon disposition, nor do they indicate the Company’s intent or need to dispose of the financial instrument.

	September 30, 2021				December 31, 2020
(In millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Short-term debt	$	516	$	519	$	517	$	523
Long-term debt	$	10,228	$	11,878	$	10,796	$	12,858

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Restructuring Costs (Tables)

9 Months Ended

Sep. 30, 2021

Restructuring and Related Activities [Abstract]

Restructuring Activities

Details of the JLT integration and restructuring activity from January 1, 2020 through September 30, 2021, are as follows:

(In millions)	Severance		Real Estate Related Costs (a)		Information Technology (a)		Consulting and Other Outside Services (b)		Total
Liability at 1/1/20	$	42	$	5	$	—	$	—	$	47
2020 charges	43		69		62		77		251
Cash payments	(69)		(25)		(55)		(77)		(226)
Non-cash charges	—		(42)		(5)		—		(47)
Liability at 12/31/20	$	16	$	7	$	2	$	—	$	25
2021 charges	9		19		15		18		61
Cash payments	(15)		(9)		(16)		(18)		(58)
Non-cash charges	—		(13)		—		—		(13)
Liability at 9/30/21	$	10	$	4	$	1	$	—	$	15

(a) Includes ROU asset impairments, data center contract termination costs and temporary infrastructure leasing costs.

(b) Includes consulting fees related to the management of the integration processes and legal fees related to the rationalization of legal entity structures.

The following details other restructuring liabilities for actions initiated prior to 2021:

(In millions)	Liability at 1/1/20		Amounts Accrued		Cash Paid		Non-Cash/Other		Liability at 12/31/20		Amounts Accrued		Cash Paid		Non-Cash/Other		Liability at 9/30/21
Severance	$	51	$	39	$	(54)	$	—	$	36	$	13	$	(35)	$	—	$	14
Future rent under non-cancelable leases and other costs	51		50		(46)		(10)		45		22		(31)		(4)		32
Total	$	102	$	89	$	(100)	$	(10)	$	81	$	35	$	(66)	$	(4)	$	46

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Selected Information And Details For MMC's Operating Segments

Selected information about the Company’s operating segments for the three and nine month periods ended September 30, 2021 and 2020 are as follows:

	Three Months Ended September 30,					Nine Months Ended September 30,
(In millions)	Revenue			Operating Income (Loss)		Revenue			Operating Income (Loss)
2021–
Risk and Insurance Services	$	2,670	(a)	$	403	$	9,036	(c)	$	2,413
Consulting	1,925		(b)	404		5,690		(d)	1,109
Total Operating Segments	4,595			807		14,726			3,522
Corporate/Eliminations	(12)			(67)		(43)			(196)
Total Consolidated	$	4,583		$	740	$	14,683		$	3,326
2020–
Risk and Insurance Services	$	2,291	(a)	$	333	$	7,805	(c)	$	1,883
Consulting	1,696		(b)	278		5,074		(d)	815
Total Operating Segments	3,987			611		12,879			2,698
Corporate/Eliminations	(19)			(71)		(71)			(203)
Total Consolidated	$	3,968		$	540	$	12,808		$	2,495

(a) Includes interest income on fiduciary funds of $4 million and $8 million in 2021 and 2020, respectively, and equity method income of $8 million in 2021 and equity method loss of $6 million in 2020.

(b) Includes inter-segment revenue of $11 million and $19 million in 2021 and 2020, respectively.

(c) Includes inter-segment revenue of $5 million for both 2021 and 2020, interest income on fiduciary funds of $12 million and $40 million in 2021 and 2020, respectively, and equity method income of $25 million and $7 million in 2021 and 2020, respectively.

(d) Includes inter-segment revenue of $38 million and $66 million in 2021 and 2020, respectively, and equity method income of $4 million in 2020 and none in 2021.

Details of Operating Segment Revenue

Details of operating segment revenue for the three and nine month periods ended September 30, 2021 and 2020 are as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2021		2020		2021		2020
Risk and Insurance Services
Marsh	$	2,355	$	2,015	$	7,336	$	6,259
Guy Carpenter	315		276		1,700		1,546
Total Risk and Insurance Services	2,670		2,291		9,036		7,805
Consulting
Mercer	1,315		1,216		3,877		3,616
Oliver Wyman Group	610		480		1,813		1,458
Total Consulting	1,925		1,696		5,690		5,074
Total Operating Segments	4,595		3,987		14,726		12,879
Corporate/Eliminations	(12)		(19)		(43)		(71)
Total	$	4,583	$	3,968	$	14,683	$	12,808

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Nature of Operations (Details)	9 Months Ended
	Sep. 30, 2021 segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of business segments (segment)	2

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Principles of Consolidation And Other Matters (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Operating funds related to regulatory requirements or as collateral under captive insurance arrangements	$ 306,000,000			$ 306,000,000		$ 270,000,000
Equity method investments lag period				3 months
Gain (loss) on investment income, net	$ 13,000,000		$ (14,000,000)	$ 43,000,000	$ (47,000,000)
Effective tax rate (as a percent)	24.20%		30.30%	27.10%	26.00%
Charge related to revaluation of deferred tax assets and liabilities		$ 100,000,000
Increase in effective tax rate due to change in U.K. corporate income tax rate, percent				3.10%
Unrecognized tax benefits	$ 101,000,000			$ 101,000,000		$ 98,000,000
Minimum
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Reasonably possible decrease in unrecognized tax benefits	0			0
Maximum
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Reasonably possible decrease in unrecognized tax benefits	$ 33,000,000			$ 33,000,000
Alexander Forbes Group Holdings Limited
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Gain (loss) on investment income, net			$ (23,000,000)

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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 4,583	$ 3,968	$ 14,683	$ 12,808
Risk and Insurance Services Segment
Disaggregation of Revenue [Line Items]
Revenue	2,670	2,291	9,036	7,805
Fiduciary interest income	4	8	12	40
Risk and Insurance Services Segment | Total International
Disaggregation of Revenue [Line Items]
Revenue	986	883	3,433	2,960
Risk and Insurance Services Segment | EMEA
Disaggregation of Revenue [Line Items]
Revenue	600	536	2,233	1,887
Risk and Insurance Services Segment | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	281	254	902	790
Risk and Insurance Services Segment | Latin America
Disaggregation of Revenue [Line Items]
Revenue	105	93	298	283
Risk and Insurance Services Segment | U.S./Canada
Disaggregation of Revenue [Line Items]
Revenue	1,366	1,126	3,894	3,271
Consulting Segment
Disaggregation of Revenue [Line Items]
Revenue	1,925	1,696	5,690	5,074
Consulting Segment | Wealth
Disaggregation of Revenue [Line Items]
Revenue	613	566	1,861	1,719
Consulting Segment | Health
Disaggregation of Revenue [Line Items]
Revenue	449	430	1,398	1,348
Consulting Segment | Career
Disaggregation of Revenue [Line Items]
Revenue	253	220	618	549
Marsh & Guy Carpenter | Risk and Insurance Services Segment
Disaggregation of Revenue [Line Items]
Revenue	2,666	2,283	9,024	7,765
Marsh Insurance Group | Risk and Insurance Services Segment
Disaggregation of Revenue [Line Items]
Revenue	2,352	2,009	7,327	6,231
Guy Carpenter Reinsurance Group | Risk and Insurance Services Segment
Disaggregation of Revenue [Line Items]
Revenue	314	274	1,697	1,534
Mercer Consulting Group | Consulting Segment
Disaggregation of Revenue [Line Items]
Revenue	1,315	1,216	3,877	3,616
Oliver Wyman Group Consulting Group | Consulting Segment
Disaggregation of Revenue [Line Items]
Revenue	$ 610	$ 480	$ 1,813	$ 1,458

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Revenue - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Contract assets	$ 307	$ 236
Contract liabilities	$ 738	$ 676

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Revenue - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue recognized that was included in the contract liability balance at the beginning of the period	$ 511	$ 420
Performance obligation satisfied in previous period	68	$ 84
Marsh Insurance Group
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation	54
Mercer Consulting Group
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation	204
Oliver Wyman Group Consulting Group
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation	$ 4

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Revenue - Estimated Revenue Expected to Be Recognized Related to Performance Obligations (Details) $ in Millions	Sep. 30, 2021 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 143
Revenue, remaining performance obligation, expected timing of satisfaction, period (in years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 66
Revenue, remaining performance obligation, expected timing of satisfaction, period (in years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 31
Revenue, remaining performance obligation, expected timing of satisfaction, period (in years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 14
Revenue, remaining performance obligation, expected timing of satisfaction, period (in years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 8
Revenue, remaining performance obligation, expected timing of satisfaction, period (in years)

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Fiduciary Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Fiduciary Assets and Liabilities [Line Items]
Net uncollected premiums and claims receivable and payable	$ 12,700		$ 12,700		$ 11,200
Risk and Insurance Services Segment
Fiduciary Assets and Liabilities [Line Items]
Interest on fiduciary funds	4	$ 8	12	$ 40
Operating Segments | Risk and Insurance Services Segment
Fiduciary Assets and Liabilities [Line Items]
Interest on fiduciary funds	$ 4	$ 8	$ 12	$ 40

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Per Share Data (Basic and Diluted EPS Calculation Continuing Operations) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income before non-controlling interests	$ 542	$ 320	$ 2,367	$ 1,667
Less: Net income attributable to non-controlling interests	5	4	27	25
Net income attributable to the Company	$ 537	$ 316	$ 2,340	$ 1,642
Basic weighted average common shares outstanding (in shares)	506	507	508	506
Dilutive effect of potentially issuable common shares (in shares)	7	5	5	5
Diluted weighted average common shares outstanding (in shares)	513	512	513	511
Average stock price used to calculate common stock equivalents (in dollars per share)	$ 151.22	$ 114.64	$ 133.41	$ 107.64

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Supplemental Disclosures to the Consolidated Statements of Cash Flows (Additional Information Concerning Acquisitions, Interest And Income Taxes Paid) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Supplemental Cash Flow Information [Abstract]
Assets acquired, excluding cash	$ 601	$ 795
Liabilities assumed	(59)	(73)
Contingent/deferred purchase consideration	(141)	(163)
Net cash outflow for current year acquisitions	401	559
Interest paid	407	437
Income taxes paid, net of refunds	$ 686	$ 414

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Supplemental Disclosures to the Consolidated Statements of Cash Flows (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Supplemental Cash Flow Information [Abstract]
Deferred and contingent consideration from prior years acquisition	$ 110	$ 125
Deferred purchase consideration from prior years' acquisitions	84	60
Contingent consideration from prior year's acquisitions	26	65
Contingent consideration from prior year's dispositions	71
Credit adjustment related to contingent consideration liabilities	(35)	22
Payment of contingent consideration	46	36
Adjustments related to contingent consideration receivable	24
Proceeds from contingent consideration, prior period dispositions	19
Non-cash issuance of common stock	225	217
Stock-based compensation expense, equity awards	$ 263	$ 219

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Other Comprehensive Income (Loss) (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			$ 9,260
Other comprehensive (loss) income, net of tax	$ (192)	$ 434	(235)	$ (93)
Balance, end of period	9,888	8,752	9,888	8,752
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(5,153)	(5,582)	(5,110)	(5,055)
Other comprehensive income (loss), before reclassification, net of tax	(231)	403	(350)	(184)
Amounts reclassified from accumulated other comprehensive income	39	31	115	91
Other comprehensive (loss) income, net of tax	(192)	434	(235)	(93)
Balance, end of period	(5,345)	(5,148)	(5,345)	(5,148)
Pension/Post-Retirement Plans Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(4,102)	(3,346)	(4,126)	(3,512)
Other comprehensive income (loss), before reclassification, net of tax	115	(94)	63	12
Amounts reclassified from accumulated other comprehensive income	39	31	115	91
Other comprehensive (loss) income, net of tax	154	(63)	178	103
Balance, end of period	(3,948)	(3,409)	(3,948)	(3,409)
Foreign Currency Translation Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(1,051)	(2,236)	(984)	(1,543)
Other comprehensive income (loss), before reclassification, net of tax	(346)	497	(413)	(196)
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Other comprehensive (loss) income, net of tax	(346)	497	(413)	(196)
Balance, end of period	$ (1,397)	$ (1,739)	$ (1,397)	$ (1,739)

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Other Comprehensive Income (Loss) (Schedule Of Components Of Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	$ (142)	$ 427	$ (179)	$ (64)
Other comprehensive income (loss), tax	50	(7)	56	29
Other comprehensive (loss) income, net of tax	(192)	434	(235)	(93)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	(346)	500	(413)	(200)
Other comprehensive income (loss), before reclassification, tax	0	3	0	(4)
Other comprehensive income (loss), before reclassification, net of tax	(346)	497	(413)	(196)
Reclassification from AOCI, net of tax	0	0	0	0
Other comprehensive (loss) income, net of tax	(346)	497	(413)	(196)
Pension/Post-Retirement Plans Gains (Losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, net of tax	115	(94)	63	12
Reclassification from AOCI, before Tax	52	40	155	119
Reclassification from AOCI, tax	13	9	40	28
Reclassification from AOCI, net of tax	39	31	115	91
Other comprehensive income (loss), before tax	204	(73)	234	136
Other comprehensive income (loss), tax	50	(10)	56	33
Other comprehensive (loss) income, net of tax	154	(63)	178	103
Prior service credits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, before Tax			(1)	(1)
Reclassification from AOCI, tax			0	0
Reclassification from AOCI, net of tax			(1)	(1)
Net actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, before Tax	52	40	156	120
Reclassification from AOCI, tax	13	9	40	28
Reclassification from AOCI, net of tax	39	31	116	92
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	88	(113)	7	17
Other comprehensive income (loss), before reclassification, tax	21	(19)	1	5
Other comprehensive income (loss), before reclassification, net of tax	67	(94)	6	12
Other adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax			(7)	0
Other comprehensive income (loss), before reclassification, tax			(2)	0
Other comprehensive income (loss), before reclassification, net of tax			(5)	0
Effect of remeasurement
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	64	0	77	0
Other comprehensive income (loss), before reclassification, tax	16	0	17	0
Other comprehensive income (loss), before reclassification, net of tax	$ 48	$ 0	60	0
Effect of settlement
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax			2	0
Other comprehensive income (loss), before reclassification, tax			0	0
Other comprehensive income (loss), before reclassification, net of tax			$ 2	$ 0

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Acquisitions and Dispositions (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) acquisition	Sep. 30, 2020 USD ($)	Dec. 31, 2020 acquisition
Business Acquisition [Line Items]
Total consideration			$ 546	$ 742
Cash paid			405	579
Estimated fair value of deferred/contingent consideration			141	163
Deferred purchase consideration from prior years' acquisitions			84	60
Contingent consideration from prior year's acquisitions			26	65
Current Fiscal Period Acquisitions
Business Acquisition [Line Items]
Total consideration			546
Cash paid			405
Estimated fair value of deferred/contingent consideration			141
Revenue related to acquisitions	$ 38		73
Operating income (loss) related to acquisitions	$ 3		4
Prior Fiscal Periods Acquisitions
Business Acquisition [Line Items]
Estimated fair value of deferred/contingent consideration			$ 72
Deferred purchase consideration from prior years' acquisitions				60
Revenue related to acquisitions		$ 52		115
Operating income (loss) related to acquisitions		$ (8)		3
Contingent consideration from prior year's acquisitions				101
Risk and Insurance Services Segment
Business Acquisition [Line Items]
Number of acquisitions made (in acquisitions) | acquisition			3		7
Minimum
Business Acquisition [Line Items]
Revenue target period (in years)			2 years
Maximum
Business Acquisition [Line Items]
Revenue target period (in years)			4 years
Certain Businesses Primarily in the U.S., U.K. and Canada
Business Acquisition [Line Items]
Disposal group, consideration			$ 84	$ 93
Gain on disposal			$ 50

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Acquisitions and Dispositions (Allocation Of Acquisition Costs) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Cash	$ 405	$ 579
Estimated fair value of deferred/contingent consideration	141	163
Total consideration	546	742
Allocation of purchase price:
Goodwill	15,648	$ 15,034	$ 15,517	$ 14,671
Current Fiscal Period Acquisitions
Business Acquisition [Line Items]
Cash	405
Estimated fair value of deferred/contingent consideration	141
Total consideration	546
Allocation of purchase price:
Cash and cash equivalents	4
Accounts receivable, net	32
Fixed assets, net	5
Other intangible assets	190
Goodwill	374
Total assets acquired	605
Current liabilities	27
Other liabilities	32
Total liabilities assumed	59
Net assets acquired	$ 546

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Acquisitions and Dispositions (Acquired Finite-Lived Intangible Assets) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 190
Client relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 176
Finite-lived intangible assets, remaining amortization period	13 years 8 months 12 days
Other
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 14
Finite-lived intangible assets, remaining amortization period	3 years 9 months 18 days

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Acquisitions and Dispositions (Pro-Forma Information) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Combination and Asset Acquisition [Abstract]
Revenue	$ 4,587	$ 4,019	$ 14,730	$ 12,955
Net income attributable to the Company	$ 538	$ 322	$ 2,345	$ 1,655
Basic net income per share attributable to the Company (in dollars per share)	$ 1.06	$ 0.63	$ 4.62	$ 3.27
Diluted net income per share attributable to the Company (in dollars per share)	$ 1.05	$ 0.63	$ 4.57	$ 3.24

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Goodwill and Other Intangibles (Changes in the Carrying Amount of Goodwill) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Goodwill [Roll Forward]
Balance as of January 1,	$ 15,517	$ 14,671
Goodwill acquired	374	462
Other adjustments	(243)	(99)
Balance at September 30,	$ 15,648	$ 15,034

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Goodwill and Other Intangibles (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Goodwill acquired	$ 374	$ 462
Goodwill, expected tax deductible amount	25	140
Goodwill	15,648	15,034	$ 15,517	$ 14,671
Aggregate amortization expense	278	$ 265
Risk and Insurance Services Segment
Segment Reporting Information [Line Items]
Goodwill	11,800
Consulting Segment
Segment Reporting Information [Line Items]
Goodwill	$ 3,800

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Goodwill and Other Intangibles (Amortized Intangible Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Cost	$ 4,194	$ 4,099
Accumulated Amortization	1,607	1,400
Net Carrying Amount	2,587	2,699
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross Cost	3,827	3,713
Accumulated Amortization	1,331	1,170
Net Carrying Amount	2,496	2,543
Other
Finite-Lived Intangible Assets [Line Items]
Gross Cost	367	386
Accumulated Amortization	276	230
Net Carrying Amount	$ 91	$ 156

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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
2021 (excludes amortization through September 30, 2021)	$ 88
2022	329
2023	302
2024	281
2025	241
Subsequent years	1,346
Net Carrying Amount	$ 2,587	$ 2,699

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Fair Value Measurements (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of investment	$ 328		$ 328		$ 280
Equity securities	74		74		72
Equity investments without readily determinable market value	33		33		33
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from contingent purchase consideration, asset			$ 90
Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Revenue target period (in years)			2 years
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Revenue target period (in years)			4 years
Private Insurance and Consulting
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of investment	178		$ 178		169
Private Equity Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of investment	150		150		111
Equity method income (loss)	13	$ 2	40	$ (6)
Alexander Forbes Group Holdings Limited
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value	$ 55		$ 55		$ 54
Number of shares sold (shares)					242
Money Market Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Share price (per share amount)	$ 1.00		$ 1.00

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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Financial instruments owned:
Exchange traded equity securities	$ 74	$ 72
Fair Value, Measurements, Recurring
Financial instruments owned:
Total assets measured at fair value	372	908
Fiduciary Assets:
Fiduciary assets	319	323
Liabilities:
Total liabilities measured at fair value	303	243
Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Financial instruments owned:
Total assets measured at fair value	359	832
Fiduciary Assets:
Fiduciary assets	319	323
Liabilities:
Total liabilities measured at fair value	0	0
Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Financial instruments owned:
Total assets measured at fair value	8	8
Fiduciary Assets:
Fiduciary assets	0	0
Liabilities:
Total liabilities measured at fair value	0	0
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Financial instruments owned:
Total assets measured at fair value	5	68
Fiduciary Assets:
Fiduciary assets	0	0
Liabilities:
Total liabilities measured at fair value	303	243
US Treasury Bills | Fair Value, Measurements, Recurring
Fiduciary Assets:
Fiduciary assets	75	150
US Treasury Bills | Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Fiduciary Assets:
Fiduciary assets	75	150
US Treasury Bills | Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fiduciary Assets:
Fiduciary assets	0	0
US Treasury Bills | Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fiduciary Assets:
Fiduciary assets	0	0
Money Market Funds | Fair Value, Measurements, Recurring
Fiduciary Assets:
Fiduciary assets	244	173
Money Market Funds | Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Fiduciary Assets:
Fiduciary assets	244	173
Money Market Funds | Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fiduciary Assets:
Fiduciary assets	0	0
Money Market Funds | Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fiduciary Assets:
Fiduciary assets	0	0
Other Assets | Fair Value, Measurements, Recurring
Financial instruments owned:
Exchange traded equity securities	60	59
Mutual funds	193	186
Other equity investments	8	8
Other Assets | Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Financial instruments owned:
Exchange traded equity securities	60	59
Mutual funds	193	186
Other equity investments	0	0
Other Assets | Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Financial instruments owned:
Exchange traded equity securities	0	0
Mutual funds	0	0
Other equity investments	8	8
Other Assets | Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Financial instruments owned:
Exchange traded equity securities	0	0
Mutual funds	0	0
Other equity investments	0	0
Cash and Cash Equivalents | Fair Value, Measurements, Recurring
Financial instruments owned:
Money market funds	106	587
Cash and Cash Equivalents | Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Financial instruments owned:
Money market funds	106	587
Cash and Cash Equivalents | Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Financial instruments owned:
Money market funds	0	0
Cash and Cash Equivalents | Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Financial instruments owned:
Money market funds	0	0
Other Receivables | Fair Value, Measurements, Recurring
Financial instruments owned:
Contingent purchase consideration asset	5	68
Other Receivables | Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Financial instruments owned:
Contingent purchase consideration asset	0	0
Other Receivables | Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Financial instruments owned:
Contingent purchase consideration asset	0	0
Other Receivables | Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Financial instruments owned:
Contingent purchase consideration asset	5	68
Accounts Payable and Accrued Liabilities and Other Liabilities | Fair Value, Measurements, Recurring
Liabilities:
Contingent purchase consideration liability	303	243
Accounts Payable and Accrued Liabilities and Other Liabilities | Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Liabilities:
Contingent purchase consideration liability	0	0
Accounts Payable and Accrued Liabilities and Other Liabilities | Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Liabilities:
Contingent purchase consideration liability	0	0
Accounts Payable and Accrued Liabilities and Other Liabilities | Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Liabilities:
Contingent purchase consideration liability	$ 303	$ 243

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Fair Value Measurements (Changes In Fair Value Of Level 3 Liabilities Representing Acquisition Related Contingent Consideration) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Revaluation impact			$ (35)	$ 22
Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 340	$ 233	243	225
Net additions	1	0	99	96
Payments	(54)	(23)	(72)	(101)
Revaluation impact	18	18	35	8
Other	(2)	2	(2)	2
Balance at September 30,	$ 303	$ 230	$ 303	$ 230

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Derivatives (Narrative) (Details) - 9 months ended Sep. 30, 2021 $ in Millions	USD ($)	EUR (€)
Derivative [Line Items]
Net investment hedge, threshold percentage of the equity balance	80.00%
Decrease in net investment hedges | $	$ 63
Net Investment Hedging
Derivative [Line Items]
Derivative, notional amount | €		€ 1,100,000,000

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Leases (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Lessee, Lease, Description [Line Items]
Lessee, operating lease, lease not yet commenced, amount	$ 13
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract (years)	10 years
Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract (years)	25 years
Office Space
Lessee, Lease, Description [Line Items]
Lease obligations, percent	99.00%

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Leases (Lease Cost and Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 93	$ 99	$ 282	$ 288
Short-term lease cost	1	1	4	3
Variable lease cost	38	28	101	92
Sublease income	(3)	(5)	(16)	(15)
Net lease cost	$ 129	$ 123	371	368
Operating cash outflows from operating leases			310	306
Right of use assets obtained in exchange for new operating lease liabilities			$ 282	$ 162
Real Estate Lease
Lessee, Lease, Description [Line Items]
Weighted-average remaining lease term	9 years	8 years 4 months 24 days	9 years	8 years 4 months 24 days
Weighted-average discount rate, percent	2.75%	3.02%	2.75%	3.02%

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Leases (Future Minimum Payments for Operating Leases) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Remainder of 2021	$ 102
2022	387
2023	340
2024	298
2025	266
2026	243
Subsequent years	897
Total future lease payments	2,533
Less: Imputed interest	(294)
Total	2,239
Current lease liabilities	339	$ 342
Long-term lease liabilities	$ 1,900	$ 1,924

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Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions		9 Months Ended
	Dec. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer		$ 90
Estimated future employer contributions in current fiscal year		39
United States
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost recognized		115	$ 110
United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost recognized		$ 106	$ 94
United Kingdom | Non-U.S. Plans | Geographic Concentration Risk
Defined Benefit Plan Disclosure [Line Items]
Concentration risk percentage	81.00%
Equity Funds | United States
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation, percentage		64.00%
Actual asset allocation percentage of equity		65.00%
Equity Funds | United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation, percentage		27.00%
Actual asset allocation percentage of equity		28.00%
Fixed Income Funds | United States
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation, percentage		36.00%
Actual asset allocation percentage of equity		35.00%
Fixed Income Funds | United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation, percentage		73.00%
Actual asset allocation percentage of equity		72.00%

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Retirement Benefits (Schedule Of Defined Benefit Plan Net Periodic Benefit Cost Combined U.S. and Significant Non-U.S. Plans) (Details) - Pension Benefits - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9	$ 10	$ 29	$ 27
Interest cost	87	112	258	322
Expected return on plan assets	(208)	(212)	(627)	(629)
Recognized actuarial loss	52	40	155	120
Net periodic benefit (credit) cost			(185)	(160)
Settlement loss			2	0
Total credit	(60)	(50)	(183)	(160)
United States
Defined Benefit Plan Disclosure [Line Items]
Interest cost	47	53	139	160
Expected return on plan assets	(82)	(86)	(245)	(259)
Recognized actuarial loss	22	18	67	54
Net periodic benefit (credit) cost	(13)	(15)	(39)	(45)
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	9	10	29	27
Interest cost	40	59	119	162
Expected return on plan assets	(126)	(126)	(382)	(370)
Recognized actuarial loss	30	22	88	66
Net periodic benefit (credit) cost			(146)	(115)
Settlement loss			2	0
Total credit	$ (47)	$ (35)	$ (144)	$ (115)

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Retirement Benefits (Schedule Of Defined Benefit Plan Net Periodic Benefit Cost Amounts Recorded in Consolidated Statement of Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits expense (Operating income)	$ (740)	$ (540)	$ (3,326)	$ (2,495)
Other net benefit (credits) cost	(69)	(60)	(211)	(187)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits expense (Operating income)	9	10	29	27
Other net benefit (credits) cost	(69)	(60)	(212)	(187)
Total credit	$ (60)	$ (50)	$ (183)	$ (160)

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Retirement Benefits (Schedule Of Defined Benefit Plan Weighted Average Assumption Used In Calculating Net Periodic Benefit Cost) (Details) - Pension Benefits	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Weighted average assumptions:
Expected return on plan assets	4.72%	5.31%
Discount rate	1.92%	2.57%
Rate of compensation increase	1.85%	1.76%

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Debt (Schedule Of Outstanding Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Current portion of long-term debt	$ 516	$ 517
Short-term debt	516	517
Long-term debt	10,744	11,313
Long-term debt, net	10,228	10,796
4.80% Senior Debt Obligations Due 2021
Debt Instrument [Line Items]
Long-term debt	$ 0	500
Interest rate	4.80%
2.75% Senior Debt Obligations Due 2022
Debt Instrument [Line Items]
Long-term debt	$ 500	499
Interest rate	2.75%
3.30% Senior Debt Obligations Due 2023
Debt Instrument [Line Items]
Long-term debt	$ 349	349
Interest rate	3.30%
4.05% Senior Debt Obligations Due 2023
Debt Instrument [Line Items]
Long-term debt	$ 249	249
Interest rate	4.05%
3.50% Senior Debt Obligations Due 2024
Debt Instrument [Line Items]
Long-term debt	$ 598	598
Interest rate	3.50%
3.875% Senior Debt Obligations Due 2024
Debt Instrument [Line Items]
Long-term debt	$ 996	995
Interest rate	3.875%
3.50% Senior Debt Obligations Due 2025
Debt Instrument [Line Items]
Long-term debt	$ 498	498
Interest rate	3.50%
1.349% Senior Debt Obligations Due 2026
Debt Instrument [Line Items]
Long-term debt	$ 647	677
Interest rate	1.349%
3.75% Senior Debt Obligations Due 2026
Debt Instrument [Line Items]
Long-term debt	$ 598	597
Interest rate	3.75%
4.375% Senior Debt Obligations Due 2029
Debt Instrument [Line Items]
Long-term debt	$ 1,499	1,499
Interest rate	4.375%
1.979% Senior Debt Obligations Due 2030
Debt Instrument [Line Items]
Long-term debt	$ 632	664
Interest rate	1.979%
2.250% Senior Debt Obligations Due 2030
Debt Instrument [Line Items]
Long-term debt	$ 738	737
Interest rate	2.25%
5.875% Senior Debt Obligations Due 2033
Debt Instrument [Line Items]
Long-term debt	$ 298	298
Interest rate	5.875%
4.75% Senior Debt Obligations Due 2039
Debt Instrument [Line Items]
Long-term debt	$ 495	495
Interest rate	4.75%
4.35% Senior Debt Obligation Due 2047
Debt Instrument [Line Items]
Long-term debt	$ 493	493
Interest rate	4.35%
4.20% Senior Debt Obligations Due 2048
Debt Instrument [Line Items]
Long-term debt	$ 592	592
Interest rate	4.20%
4.90% Senior Debt Obligations Due 2049
Debt Instrument [Line Items]
Long-term debt	$ 1,238	1,237
Interest rate	4.90%
5.70% Mortgage Due 2035
Debt Instrument [Line Items]
Long-term debt	$ 320	331
Interest rate	5.70%
Other
Debt Instrument [Line Items]
Long-term debt	$ 4	$ 5

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Debt (Narrative) (Details) - USD ($)			1 Months Ended		3 Months Ended	9 Months Ended
	Apr. 15, 2021	Apr. 02, 2021	Mar. 31, 2020	Jan. 31, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Apr. 09, 2021	Apr. 08, 2021	Dec. 31, 2020	May 31, 2020
Debt Instrument [Line Items]
Commercial paper outstanding						$ 0
Proceeds from lines of credit						0	$ 1,000,000,000
Other Debt Facilities
Debt Instrument [Line Items]
Long-term line of credit						0				$ 0
Debt instrument, unused borrowing capacity						512,000,000				$ 573,000,000
Commercial Paper
Debt Instrument [Line Items]
Short-term debt								$ 2,000,000,000	$ 1,500,000,000
Revolving Credit Facility | New Facility
Debt Instrument [Line Items]
Debt facilities, maximum borrowing capacity		$ 2,800,000,000
Term of debt		5 years
Long-term line of credit						0
Revolving Credit Facility | Old Facility
Debt Instrument [Line Items]
Debt facilities, maximum borrowing capacity						$ 1,800,000,000
Term of debt						5 years
Revolving Credit Facility | 364-day Facility
Debt Instrument [Line Items]
Debt facilities, maximum borrowing capacity						$ 1,000,000,000
Term of debt						364 days
Term Loan Facility | $500 Million One-Year Term Loan and $500 Million Two-Year Term Loan
Debt Instrument [Line Items]
Proceeds from lines of credit					$ 1,000,000,000
Term Loan Facility | $500 Million One-Year Term Loan Facility
Debt Instrument [Line Items]
Debt facilities, maximum borrowing capacity				$ 500,000,000
Term of debt				1 year
Term Loan Facility | $500 Million Two-Year Term Loan Facility
Debt Instrument [Line Items]
Debt facilities, maximum borrowing capacity				$ 500,000,000
Term of debt				2 years
Senior Notes
Debt Instrument [Line Items]
Repayments of debt	$ 500,000,000		$ 500,000,000
Senior Notes | 2.250% Senior Debt Obligations Due 2030
Debt Instrument [Line Items]
Debt instrument face amount											$ 750,000,000

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Debt (Estimated Fair Value of Significant Financial Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term debt	$ 516	$ 517
Long-term debt	10,228	10,796
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term debt	519	523
Long-term debt	$ 11,878	$ 12,858

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Restructuring Costs (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Costs incurred			$ 35		$ 89
Global Information Technology, HR Functions and Future Rent
Restructuring Cost and Reserve [Line Items]
Costs incurred	$ 12		35
Jardine Lloyd Thompson Group plc
Restructuring Cost and Reserve [Line Items]
Costs incurred			61		$ 251
Jardine Lloyd Thompson Group plc | Acquisition related
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	647		647
Costs incurred	19	$ 44	61	$ 181
Jardine Lloyd Thompson Group plc | Acquisition related | Risk and Insurance Services Segment
Restructuring Cost and Reserve [Line Items]
Costs incurred	11		38
Jardine Lloyd Thompson Group plc | Acquisition related | Consulting Segment
Restructuring Cost and Reserve [Line Items]
Costs incurred	$ 9		$ 21

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Restructuring Costs (Restructuring Activities) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Restructuring Reserve [Roll Forward]
Liability at beginning of period	$ 81	$ 102
Amounts Accrued	35	89
Cash Paid	(66)	(100)
Non-Cash/Other	(4)	(10)
Liability at end of period	46	81
Severance
Restructuring Reserve [Roll Forward]
Liability at beginning of period	36	51
Amounts Accrued	13	39
Cash Paid	(35)	(54)
Non-Cash/Other	0	0
Liability at end of period	14	36
Future rent under non-cancelable leases and other costs
Restructuring Reserve [Roll Forward]
Liability at beginning of period	45	51
Amounts Accrued	22	50
Cash Paid	(31)	(46)
Non-Cash/Other	(4)	(10)
Liability at end of period	32	45
Jardine Lloyd Thompson Group plc
Restructuring Reserve [Roll Forward]
Liability at beginning of period	25	47
Amounts Accrued	61	251
Cash Paid	(58)	(226)
Non-cash charges	(13)	(47)
Liability at end of period	15	25
Jardine Lloyd Thompson Group plc | Severance
Restructuring Reserve [Roll Forward]
Liability at beginning of period	16	42
Amounts Accrued	9	43
Cash Paid	(15)	(69)
Non-cash charges	0	0
Liability at end of period	10	16
Jardine Lloyd Thompson Group plc | Real estate related costs
Restructuring Reserve [Roll Forward]
Liability at beginning of period	7	5
Amounts Accrued	19	69
Cash Paid	(9)	(25)
Non-cash charges	(13)	(42)
Liability at end of period	4	7
Jardine Lloyd Thompson Group plc | Information Technology
Restructuring Reserve [Roll Forward]
Liability at beginning of period	2	0
Amounts Accrued	15	62
Cash Paid	(16)	(55)
Non-cash charges	0	(5)
Liability at end of period	1	2
Jardine Lloyd Thompson Group plc | Consulting and other outside services
Restructuring Reserve [Roll Forward]
Liability at beginning of period	0	0
Amounts Accrued	18	77
Cash Paid	(18)	(77)
Non-cash charges	0	0
Liability at end of period	$ 0	$ 0

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Common Stock (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Nov. 30, 2019
Equity, Class of Treasury Stock [Line Items]
Common stock repurchased (in shares)		0
Purchase of treasury shares	$ 734,000,000
Stock-based compensation, shares issued during period (in shares)	3,100,000	3,400,000
Common Stock
Equity, Class of Treasury Stock [Line Items]
Share repurchases program, authorized amount (up to)			$ 2,500,000,000
Common stock repurchased (in shares)	5,300,000
Stock repurchase program, remaining authorized repurchase amount	$ 1,700,000,000

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Claims, Lawsuits And Other Contingencies (Details) - Jardine Lloyd Thompson Group plc case in Thousands, £ in Millions, $ in Millions	48 Months Ended
	Dec. 31, 2018 case	Sep. 30, 2021 GBP (£)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 GBP (£)	Dec. 31, 2020 USD ($)	Feb. 28, 2019 GBP (£)	Feb. 28, 2019 USD ($)
Loss Contingencies [Line Items]
Individual cases analyzed	14
Loss contingency accrual		£ 25	$ 34	£ 155	$ 210	£ 59	$ 77

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Segment Information (Selected Information And Details For MMC's Operating Segments) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 4,583	$ 3,968	$ 14,683	$ 12,808
Operating Income (Loss)	740	540	3,326	2,495
Risk and Insurance Services Segment
Segment Reporting Information [Line Items]
Revenue	2,670	2,291	9,036	7,805
Interest on fiduciary funds	4	8	12	40
Consulting Segment
Segment Reporting Information [Line Items]
Revenue	1,925	1,696	5,690	5,074
Operating Segments
Segment Reporting Information [Line Items]
Revenue	4,595	3,987	14,726	12,879
Operating Income (Loss)	807	611	3,522	2,698
Operating Segments | Risk and Insurance Services Segment
Segment Reporting Information [Line Items]
Revenue	2,670	2,291	9,036	7,805
Operating Income (Loss)	403	333	2,413	1,883
Interest on fiduciary funds	4	8	12	40
Equity method income (loss)	8	(6)	25	7
Operating Segments | Consulting Segment
Segment Reporting Information [Line Items]
Revenue	1,925	1,696	5,690	5,074
Operating Income (Loss)	404	278	1,109	815
Equity method income (loss)			0	4
Corporate/Eliminations
Segment Reporting Information [Line Items]
Revenue	(12)	(19)	(43)	(71)
Operating Income (Loss)	(67)	(71)	(196)	(203)
Intersegment Eliminations | Risk and Insurance Services Segment
Segment Reporting Information [Line Items]
Revenue			5	5
Intersegment Eliminations | Consulting Segment
Segment Reporting Information [Line Items]
Revenue	$ 11	$ 19	$ 38	$ 66

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Segment Information (Details of Operating Segment Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 4,583	$ 3,968	$ 14,683	$ 12,808
Risk and Insurance Services Segment
Segment Reporting Information [Line Items]
Revenue	2,670	2,291	9,036	7,805
Risk and Insurance Services Segment | Marsh Insurance Group
Segment Reporting Information [Line Items]
Revenue	2,352	2,009	7,327	6,231
Risk and Insurance Services Segment | Guy Carpenter Reinsurance Group
Segment Reporting Information [Line Items]
Revenue	314	274	1,697	1,534
Consulting Segment
Segment Reporting Information [Line Items]
Revenue	1,925	1,696	5,690	5,074
Consulting Segment | Mercer Consulting Group
Segment Reporting Information [Line Items]
Revenue	1,315	1,216	3,877	3,616
Consulting Segment | Oliver Wyman Group Consulting Group
Segment Reporting Information [Line Items]
Revenue	610	480	1,813	1,458
Operating Segments
Segment Reporting Information [Line Items]
Revenue	4,595	3,987	14,726	12,879
Operating Segments | Risk and Insurance Services Segment
Segment Reporting Information [Line Items]
Revenue	2,670	2,291	9,036	7,805
Operating Segments | Risk and Insurance Services Segment | Marsh Insurance Group
Segment Reporting Information [Line Items]
Revenue	2,355	2,015	7,336	6,259
Operating Segments | Risk and Insurance Services Segment | Guy Carpenter Reinsurance Group
Segment Reporting Information [Line Items]
Revenue	315	276	1,700	1,546
Operating Segments | Consulting Segment
Segment Reporting Information [Line Items]
Revenue	1,925	1,696	5,690	5,074
Operating Segments | Consulting Segment | Mercer Consulting Group
Segment Reporting Information [Line Items]
Revenue	1,315	1,216	3,877	3,616
Operating Segments | Consulting Segment | Oliver Wyman Group Consulting Group
Segment Reporting Information [Line Items]
Revenue	610	480	1,813	1,458
Corporate/Eliminations
Segment Reporting Information [Line Items]
Revenue	$ (12)	$ (19)	$ (43)	$ (71)