10-Q

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

_____________________________________________ 

FORM 10-Q

_____________________________________________ 

Quarterly Report Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

For the quarterly period ended June 30, 2018

_____________________________________________ 

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

_____________________________________________ 

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  x	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. o

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 July 24, 2018, there were outstanding 504,979,546 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," "forecast," "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 impact of any investigations, reviews, market studies or other activity by regulatory or law enforcement authorities, including the ongoing investigations by the European Commission, the Australian Royal Commission and the U.K. FCA;

• the impact from lawsuits, other contingent liabilities and loss contingencies arising from errors and omissions, breach of fiduciary duty or other claims against us;

• our organization's ability to maintain adequate safeguards to protect the security of our information systems and confidential, personal or proprietary information, particularly given the large volume of our vendor network and the need to patch software vulnerabilities;

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

• the financial and operational impact of complying with laws and regulations where we operate, including cybersecurity and data privacy regulations such as the E.U.’s General Data Protection Regulation, anti-corruption laws and trade sanctions regimes;

• the regulatory, contractual and reputational risks that arise based on insurance placement activities and various broker revenue streams;

• the extent to which we manage risks associated with the various services, including fiduciary and investments and other advisory services;

• our ability to successfully recover if we experience a business continuity problem due to cyberattack, natural disaster or otherwise;

• the impact of changes in tax laws, guidance and interpretations, including related to certain provisions of the U.S. Tax Cuts and Jobs Act, or disagreements with tax authorities;

• the impact of fluctuations in foreign exchange and interest rates on our results;

• the impact of macroeconomic, political, regulatory or market conditions on us, our clients and the industries in which we operate; and

• the impact of changes in accounting rules or in our accounting estimates or assumptions, including the impact of the adoption of the new revenue recognition, pension and lease accounting standards.

The factors identified above are not exhaustive. 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 Companies 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 in the "Management’s Discussion and Analysis of Financial Condition and Results of Operations" section of 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	39
	OF OPERATIONS
ITEM 3.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	51
ITEM 4.	CONTROLS & PROCEDURES	52
PART II. OTHER INFORMATION		53
ITEM 1.	LEGAL PROCEEDINGS	53
ITEM 1A.	RISK FACTORS	53
ITEM 2.	UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	53
ITEM 3.	DEFAULTS UPON SENIOR SECURITIES	54
ITEM 4.	MINE SAFETY DISCLOSURE	54
ITEM 5.	OTHER INFORMATION	54
ITEM 6.	EXHIBITS	54

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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 June 30,						Six Months Ended June 30,
(In millions, except per share amounts)	2018			2017			2018			2017
Revenue	$	3,734		$	3,495		$	7,734		$	6,998
Expense:
Compensation and benefits	2,135			1,998			4,359			4,003
Other operating expenses	908			796			1,776			1,545
Operating expenses	3,043			2,794			6,135			5,548
Operating income	691			701			1,599			1,450
Other net benefit credits	65			63			131			123
Interest income	3			2			6			4
Interest expense	(68		)	(60		)	(129		)	(118		)
Investment income	28			5			28			5
Income before income taxes	719			711			1,635			1,464
Income tax expense	183			204			403			379
Net income before non-controlling interests	536			507			1,232			1,085
Less: Net income attributable to non-controlling interests	5			6			11			15
Net income attributable to the Company	$	531		$	501		$	1,221		$	1,070
Net income Per Share Attributable to the Company:
Basic	$	1.05		$	0.98		$	2.41		$	2.08
Diluted	$	1.04		$	0.96		$	2.38		$	2.05
Average number of shares outstanding:
Basic	507			514			507			514
Diluted	512			520			513			521
Shares outstanding at June 30,	505			513			505			513

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 June 30,						Six Months Ended June 30,
(In millions)	2018			2017			2018			2017
Net income before non-controlling interests	$	536		$	507		$	1,232		$	1,085
Other comprehensive (loss) income, before tax:
Foreign currency translation adjustments	(529		)	290			(301		)	525
Unrealized investment gains	—			24			—			19
Gain (loss) related to pension/post-retirement plans	192			(5		)	108			28
Other comprehensive (loss) income, before tax	(337		)	309			(193		)	572
Income tax expense on other comprehensive income	23			13			15			20
Other comprehensive (loss) income, net of tax	(360		)	296			(208		)	552
Comprehensive income	176			803			1,024			1,637
Less: comprehensive income attributable to non-controlling interest	5			6			11			15
Comprehensive income attributable to the Company	$	171		$	797		$	1,013		$	1,622

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 amounts)	(Unaudited) June 30, 2018			December 31, 2017
ASSETS
Current assets:
Cash and cash equivalents	$	1,036		$	1,205
Receivables
Commissions and fees	4,288			3,777
Advanced premiums and claims	62			65
Other	367			401
	4,717			4,243
Less-allowance for doubtful accounts and cancellations	(116		)	(110		)
Net receivables	4,601			4,133
Other current assets	538			224
Total current assets	6,175			5,562
Goodwill	9,177			9,089
Other intangible assets	1,234			1,274
Fixed assets (net of accumulated depreciation and amortization of $1,857 at June 30, 2018 and $1,826 at December 31, 2017)	698			712
Pension related assets	1,808			1,693
Deferred tax assets	532			669
Other assets	1,535			1,430
	$	21,159		$	20,429

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 amounts)	(Unaudited) June 30, 2018			December 31, 2017
LIABILITIES AND EQUITY
Current liabilities:
Short-term debt	$	439		$	262
Accounts payable and accrued liabilities	2,246			2,083
Accrued compensation and employee benefits	1,103			1,718
Accrued income taxes	216			199
Dividends payable	212			—
Total current liabilities	4,216			4,262
Fiduciary liabilities	5,118			4,847
Less – cash and investments held in a fiduciary capacity	(5,118		)	(4,847		)
	—			—
Long-term debt	5,813			5,225
Pension, post-retirement and post-employment benefits	1,768			1,888
Liabilities for errors and omissions	303			301
Other liabilities	1,262			1,311
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 June 30, 2018
and December 31, 2017	561			561
Additional paid-in capital	732			784
Retained earnings	14,131			13,140
Accumulated other comprehensive loss	(4,265		)	(4,043		)
Non-controlling interests	81			83
	11,240			10,525
Less – treasury shares, at cost, 55,507,129 shares at June 30, 2018
and 51,930,135 shares at December 31, 2017	(3,443		)	(3,083		)
Total equity	7,797			7,442
	$	21,159		$	20,429

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

7

MARSH & McLENNAN COMPANIES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

For the Six Months Ended June 30,
(In millions)	2018			2017
Operating cash flows:
Net income before non-controlling interests	$	1,232		$	1,085
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization of fixed assets and capitalized software	159			156
Amortization of intangible assets	88			80
Adjustments and payments related to contingent consideration liability	2			(13		)
Provision for deferred income taxes	34			42
(Gain) loss on investments	(28		)	(5		)
(Gain) loss on disposition of assets	(1		)	9
Share-based compensation expense	99			75
Changes in assets and liabilities:
Net receivables	(388		)	(318		)
Other current assets	4			(18		)
Other assets	(10		)	(34		)
Accounts payable and accrued liabilities	30			52
Accrued compensation and employee benefits	(614		)	(579		)
Accrued income taxes	18			45
Contributions to pension and other benefit plans in excess of current year expense/credit	(178		)	(214		)
Other liabilities	(10		)	9
Effect of exchange rate changes	(24		)	(29		)
Net cash provided by operations	413			343
Financing cash flows:
Purchase of treasury shares	(500		)	(400		)
Net increase in commercial paper	175			100
Proceeds from issuance of debt	592			987
Repayments of debt	(6		)	(256		)
Shares withheld for taxes on vested units – treasury shares	(62		)	(48		)
Issuance of common stock from treasury shares	48			94
Payments of deferred and contingent consideration for acquisitions	(85		)	(97		)
Distributions of non-controlling interests	(11		)	(13		)
Dividends paid	(383		)	(351		)
Net cash (used for) provided by financing activities	(232		)	16
Investing cash flows:
Capital expenditures	(135		)	(144		)
Net (purchases) sales of long-term investments	(3		)	12
Proceeds from sales of fixed assets	1			4
Dispositions	4			—
Acquisitions	(144		)	(412		)
Other, net	(2		)	2
Net cash used for investing activities	(279		)	(538		)
Effect of exchange rate changes on cash and cash equivalents	(71		)	119
Decrease in cash and cash equivalents	(169		)	(60		)
Cash and cash equivalents at beginning of period	1,205			1,026
Cash and cash equivalents at end of period	$	1,036		$	966

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

8

MARSH & McLENNAN COMPANIES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF EQUITY

(Unaudited)

For the Six Months Ended June 30,
(In millions, except per share amounts)	2018			2017
COMMON STOCK
Balance, beginning and end of period	$	561		$	561
ADDITIONAL PAID-IN CAPITAL
Balance, beginning of year	$	784		$	842
Change in accrued stock compensation costs	(26		)	(10		)
Issuance of shares under stock compensation plans and employee stock purchase plans	(26		)	(69		)
Balance, end of period	$	732		$	763
RETAINED EARNINGS
Balance, beginning of year	$	13,140		$	12,388
Cumulative effect of adoption of the revenue recognition standard (See Note 17)	364			—
Cumulative effect of adoption of other accounting standards (See Note 17)	—			—
Net income attributable to the Company	1,221			1,070
Dividend equivalents declared – (per share amounts: $1.165 in 2018 and $1.06 in 2017)	(3		)	(2		)
Dividends declared – (per share amounts: $1.165 in 2018 and $1.06 in 2017)	(591		)	(541		)
Balance, end of period	$	14,131		$	12,915
ACCUMULATED OTHER COMPREHENSIVE LOSS
Balance, beginning of year	$	(4,043	)	$	(5,093	)
Cumulative effect of adoption of the financial instruments standard (See Note 17)	(14		)	—
Other comprehensive income, net of tax	(208		)	552
Balance, end of period	$	(4,265	)	$	(4,541	)
TREASURY SHARES
Balance, beginning of year	$	(3,083	)	$	(2,506	)
Issuance of shares under stock compensation plans and employee stock purchase plans	140			201
Purchase of treasury shares	(500		)	(400		)
Balance, end of period	$	(3,443	)	$	(2,705	)
NON-CONTROLLING INTERESTS
Balance, beginning of year	$	83		$	80
Net income attributable to non-controlling interests	11			15
Distributions and other changes	(13		)	(14		)
Balance, end of period	$	81		$	81
TOTAL EQUITY	$	7,797		$	7,074

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

9

MARSH & McLENNAN COMPANIES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1.     Nature of Operations

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

The Risk and Insurance Services segment 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.

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. As of June 30, 2018, Mercer had assets under delegated management of approximately $240 billion worldwide. Oliver Wyman Group provides specialized management and economic and brand consulting services.

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

2.     Principles of Consolidation and Other Matters

The consolidated financial statements included herein have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission. While certain information and footnote 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 for interim filings, 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, 2017 (the "2017 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 three and six month periods ended June 30, 2018 and 2017.

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 of approximately $189 million, primarily related to regulatory requirements outside the United States or as collateral under captive insurance arrangements.

Investments

The caption "Investment income" 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 debt 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 certain equity investments, that under legacy Generally Accepted Accounting Principles, were previously accounted as available for sale securities, whereby the mark-to-market change was recorded to other comprehensive income in its consolidated balance sheet. As discussed in Note 17, effective January 1, 2018, the Company adopted new accounting guidance that requires equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. The Company recorded a cumulative-effect adjustment that increased retained earnings as of the beginning of the period of adoption of $14 million, reflecting the reclassification of cumulative unrealized gains, net of tax as of December 31, 2017 from accumulated other comprehensive income to retained earnings. Prior periods have not been restated.

The Company holds investments in certain private equity funds that are accounted for under 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

10

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 gains of $28 million for both the three and six month periods ended June 30, 2018 and gains of $5 million for both the three and six month periods ended June 30, 2017. The three months ended June 30, 2018 includes gains of $26 million related to mark-to-market changes in securities with readily determinable market values and gains of $2 million related to investments in private equity funds. The six months ended June 30, 2018 includes gains of $19 million related to mark-to-market changes in securities with readily determinable market values and gains of $9 million related to investments in private equity funds. The prior period gains are related to the Company's investments in private equity funds.

Income Taxes

The Company's effective tax rate in the second quarter of 2018 was 25.6% compared with 28.6% in the second quarter of 2017. The effective tax rates for the first six months of 2018 and 2017 were 24.7% and 25.9%. The rate in the first half of 2018 reflects ongoing impacts of the Tax Cuts and Jobs Act (the "TCJA"), primarily the reduced 21% U.S. statutory rate and certain tax planning benefits, largely offset by higher estimated costs from the new territorial system, greater disallowance of compensation and entertainment deductions and a decrease in excess tax benefits related to share-based compensation. The tax rates in 2017 reflect foreign operations taxed at rates below the 35% U.S. statutory tax rate, including the effect of repatriation. The tax rates in both periods reflect the impact of discrete tax matters, tax legislation and nontaxable adjustments to contingent acquisition consideration.

As a result of TCJA, two discrete provisional charges were recorded in the fourth quarter of 2017. The transition to the new territorial tax system resulted in a transition tax payable over eight years on undistributed earnings of non-U.S. subsidiaries. This mandatory taxation of accumulated foreign earnings substantially changed the economic considerations of continued permanent investment of those accumulated earnings, a key component of the Company's global capital strategy. As a result of the transition tax, the Company anticipates repatriating the majority of the accumulated earnings that it previously intended to permanently invest. A charge of $240 million was recorded in the fourth quarter of 2017 as a provisional estimate of the transition tax and ancillary effects.

The provisional estimate of transition tax includes state taxes and foreign withholding taxes related to the change in the Company's indefinite reinvestment assertion with respect to its pre-2018 foreign earnings. The Company previously considered most unremitted earnings of its non-U.S. subsidiaries, except amounts repatriated in the year earned, to be permanently reinvested and, accordingly, recorded no deferred U.S. income taxes on such earnings. The Company has initially analyzed its global capital requirements and potential tax liabilities attributable to repatriation. The Company estimates that it will repatriate $3.4 billion that was previously considered indefinitely invested. Included in the $240 million charge in 2017 is a $53 million provisional estimate for withholding and state income taxes.

In addition, reducing the U.S. corporate tax rate from 35% to 21% and the change in deductibility of certain compensation awards to certain executive officers of the Company effective on January 1, 2018, resulted in a net charge of $220 million in the fourth quarter of 2017 to reduce the value of our U.S. deferred tax assets and liabilities. Adjustments during the first half of 2018 to provisional estimates of transition taxes and U.S. deferred tax assets and liabilities increased income tax expense by $3 million. These estimates may be further adjusted during 2018 when the Company has finalized its analysis of all the relevant information.

In December of 2017, the SEC issued Staff Accounting Bulletin 118 ("SAB 118"), establishing a one-year measurement period to complete the accounting for the income tax effects of the TCJA. SAB 118 anticipates three alternative states of completion at the end of the reporting period of accounting for these effects: (1) the tax accounting work has been completed with respect to an item; (2) a provisional amount has been recognized because a reasonable estimate was possible, or (3) a reasonable estimate cannot be provided. The Company believes its analysis of the TCJA to date provides an appropriate basis to record a provisional estimate. Our provisional estimates include the effects of the deemed repatriation tax and the Company's position with respect to permanently reinvested earnings, the impact of the Global Intangible Low Taxed Income ("GILTI") provision and the remeasurement of U.S. deferred tax based on estimated enactment-date deferred tax balances, which may be adjusted in 2018 when the 2017 tax return is filed. TCJA’s transition tax requires detailed calculations of current and accumulated taxable earnings at the level of each foreign subsidiary, computed in functional currency at the greater of two alternative measurement dates and converted into U.S. dollars. In preparing its 2017 U.S. federal return the Company is performing these calculations for approximately seven hundred foreign subsidiaries. In the third quarter management expects to update its estimate of the transition tax, its global permanent investment strategy, and the impact on U.S. deferred tax assets from the change in tax rate. However, given the significant complexity of the

11

TCJA and still-anticipated guidance from the U.S. Treasury about its implementation, these estimates may be further adjusted during the fourth quarter.

The Company is routinely examined by tax authorities in the jurisdictions in which it has significant operations. The Company regularly considers the likelihood of assessments in each of the taxing jurisdictions resulting from examinations. When evaluating the potential imposition of penalties, the Company considers a number of relevant factors under penalty statutes, including appropriate disclosure of the tax return position, the existence of legal authority supporting the Company's position and reliance on the opinion of professional tax advisors.

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 increased from $71 million at December 31, 2017 to $72 million at June 30, 2018 due to current accruals partially offset by settlements of audits and expirations of statutes of limitation. It is reasonably possible that the total amount of unrecognized tax benefits will decrease between zero and approximately $8 million within the next twelve months due to settlements of audits and expirations of statutes of limitation.

3.     Revenue

2018 - Under the New Revenue Recognition Standard

In May 2014, the Financial Accounting Standards Board ("FASB") issued new accounting guidance related to revenue from contracts with customers. The core principle of the 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. To achieve that principle, the entity applies the following steps: 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.

The Company adopted the new guidance effective January 1, 2018, using the modified retrospective method, which applies the new guidance beginning in the year of adoption, with the cumulative effect of initially applying the guidance recognized as an adjustment to retained earnings at January 1, 2018. The Company elected to apply the modified retrospective method to all contracts. The comparative financial information included herein has not been restated and continues to be reported under the legacy accounting standards that were in effect for those periods.

In the first quarter of 2018, the Company recorded an increase to the opening balance of retained earnings of $364 million to reflect the cumulative effect of adopting this revenue standard. Other revenue included in the consolidated statements of income that is not from contracts with customers is less than one-quarter of one percent of total revenue, and therefore is not presented as a separate line item.

As discussed in more detail below, the adoption of this new revenue standard will shift income among quarters from historical patterns, but is not expected to have a significant year-over-year impact on annual revenue.

Risk and Insurance Services

Risk and Insurance Services revenue reflects compensation for brokerage and consulting services through commissions and fees. Commission rates and fees vary in amount and can depend upon a number of factors, including the type of insurance or reinsurance coverage provided, the particular insurer or reinsurer selected, and the capacity in which the broker acts and negotiates with clients. For the majority of the insurance and reinsurance brokerage arrangements, advice and services provided which culminate in the placement of an effective policy are considered a single performance obligation. Arrangements with clients may include the placement of a single policy, multiple policies or a combination of policy placements and other services. Consideration related to such "bundled arrangements" is allocated to the individual performance obligations based on their relative fair value. Revenue for policy placement is generally recognized on the policy effective date, at which point control over the services provided by the Company has transferred to the client and the client has accepted the services. The contractual terms for certain fee based brokerage arrangements meet the criteria for revenue recognition over time. For such arrangements, revenue is recognized using output measures, which correspond to the progress toward completing the performance obligation. Fees for non-risk transfer services provided to clients are recognized over time in the period the services are provided, using a proportional performance model, primarily based on input measures. These measures of progress provide a faithful depiction of the progress towards completion of the performance obligation.

Revenue related to reinsurance brokerage for excess of loss ("XOL") treaties is estimated based on contractually specified minimum or deposit premiums, and adjusted as additional evidence of the ultimate amount of brokerage is received. Revenue for quota share treaties is estimated based on indications of estimated premium income provided by the ceding insurer. The estimated brokerage revenue recognized for quota share treaties is constrained

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to an amount that is probable to not have a significant negative adjustment. The estimated revenue and the constraint are evaluated as additional evidence of the ultimate amount of underlying risks to be covered is received over the 12 to 18 months following the effective date of the placement.

In addition to commissions and fees from its clients, the Company also receives other compensation from insurance companies. This other insurer compensation includes, among other things, payments for consulting and analytics services provided to insurers, fees for administrative and other services provided to or on behalf of insurers (including services relating to the administration and management of quota shares, panels and other facilities in which insurers participate). The Company is also eligible for certain contingent commissions from insurers based on the attainment of specified metrics (i.e., volume and loss ratio measures) relating to Marsh's placements, particularly in Marsh & McLennan Agency ("MMA") and in parts of Marsh's international operations. Revenue for contingent commissions from insurers is estimated based on historical evidence of the achievement of the respective contingent metrics and recorded as the underlying policies that contribute to the achievement of the metric are placed. Due to the uncertainty of the amount of contingent consideration that will be received, the estimated revenue is constrained to an amount that is probable to not have a significant negative adjustment. Contingent consideration is generally received in the first quarter of the subsequent year.

A significant majority of the Company's Risk and Insurance Services revenue is for performance obligations recognized at a point in time. Marsh and Guy Carpenter also receive interest income on certain funds (such as premiums and claims proceeds) held in a fiduciary capacity for others.

Insurance brokerage commissions are generally invoiced on the policy effective date. Fee based arrangements generally include a percentage of the total fee due upon signing the arrangement, with additional fixed installments payable over the remainder of the year. Payment terms range from receipt of invoice up to 30 days from invoice date.

Reinsurance brokerage is recognized on the effective date of the treaty. Payment terms depend on the type of reinsurance. For XOL treaties, brokerage is typically collected in four installments during an annual treaty period based on a contractually specified minimum or deposit premium. For proportional or quota share treaties, brokerage is billed as underlying insured risks attach to the reinsurance treaty, generally over 12 to 18 months.

Consulting

The major component of revenue in the Consulting business is fees paid by clients for advice and services. Mercer, principally through its health line of business, also receives revenue in the form of commissions received from insurance companies for the placement of group (and occasionally individual) insurance contracts, primarily health, life and accident coverages. Revenue for Mercer’s investment management business and certain of Mercer’s defined benefit administration services consists principally of fees based on assets under delegated management or administration.

Consulting projects in Mercer’s wealth and career businesses, as well as consulting projects in Oliver Wyman typically consist of a single performance obligation, which is recognized over time as control is transferred continuously to customers. Typically, revenue is recognized over time using an input measure of time expended to date relative to total estimated time incurred at project completion. Incurred hours represent services rendered and thereby faithfullydepicts the transfer of control to the customer.

On a limited number of engagements, performance fees may also be earned for achieving certain prescribed performance criteria. Revenue for achievement is estimated and constrained to an amount that is probable to not have a significant negative adjustment.

A significant majority of fee revenues in the Consulting segment is recognized over time.

For consulting projects, Mercer generally invoices monthly in arrears with payment due within 30 days of the invoice date. Fees for delegated management services are either deducted from the net asset value of the fund or invoiced to the client on monthly or quarterly basis in arrears. Oliver Wyman typically bills its clients 30-60 days in arrears with payment due upon receipt of the invoice.

Health brokerage and consulting services are components of both Marsh, which includes MMA, and Mercer, with approximately 70% of such revenues reported in Mercer. Health contracts typically involve a series of distinct services that are treated as a single performance obligation. Revenue for these services is recognized over time based on the amount of remuneration the Company expects to be entitled in exchange for these services. Payments for health brokerage and consulting services are typically paid monthly in arrears from carriers based on insured lives under the contract.

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

	Three Months Ended June 30,		Six Months Ended June 30,
	2018		2018
Marsh:
EMEA	$	526	$	1,169
Asia Pacific	183		347
Latin America	99		183
Total International	808		1,699
U.S./Canada	941		1,744
Total Marsh	1,749		3,443
Guy Carpenter	332		969
Subtotal	2,081		4,412
Fiduciary interest income	15		28
Total Risk and Insurance Services	$	2,096	$	4,440
Mercer:
Defined Benefit Consulting & Administration	$	320	$	659
Investment Management & Related Services	232		458
Total Wealth	552		1,117
Health	429		871
Career	177		341
Total Mercer	1,158		2,329
Oliver Wyman	492		989
Total Consulting	$	1,650	$	3,318

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

(In millions)	January 1, 2018		June 30, 2018
Contract Assets	$	128	$	178
Contract Liabilities	$	583	$	647

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. Estimated revenue related to achievement of volume or loss ratio metrics cannot be billed or collected until all related policy placements are completed and the contingency is resolved. The change in contract assets from January 1, 2018 to June 30, 2018 is primarily due to $215 million of additions during the period partly offset by $166 million transferred to accounts receivables, as the rights to bill and collect became unconditional. Contract assets are included in other current assets in the Company's consolidated balance sheet. Contract liabilities primarily relate to the advance consideration received from customers. Contract liabilities are included in current liabilities in the Company's consolidated balance sheet. Revenue recognized in the first six months of 2018 that was included in the contract liability balance at the beginning of the year was $334 million. The amount of revenue recognized in the first six months of 2018 from performance obligations satisfied in previous periods, mainly due to variable consideration from contracts with insurers, quota share and excess of loss business and consulting contracts previously considered constrained was $36 million.

The Company applies the practical expedient and therefore 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 $48 million for Marsh, $450

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million for Mercer and $2 million for Oliver Wyman. The Company expects revenue in 2019, 2020, 2021, 2022 and 2023 and beyond of $239 million, $129 million, $74 million, $41 million and $17 million, respectively, related to these performance obligations.

Costs to Obtain and Fulfill a Contract

Under the new standard, certain costs to obtain or fulfill a contract that were previously expensed as incurred have been capitalized.

The Company capitalized the incremental costs to obtain contracts primarily related to commissions or sales bonus payments. These deferred costs are amortized over the expected life of the underlying customer relationships.

In Risk and Insurance Services, the Company capitalizes certain pre-placement costs that are considered fulfillment costs that meet the following criteria: these costs 1) relate directly to a contract, 2) enhance resources used to satisfy the Company’s performance obligation and 3) are expected to be recovered through revenue generated by the contract. These costs are amortized at a point in time when the associated revenue is recognized.

In Consulting, the Company incurs implementation costs necessary to facilitate the delivery of the contracted services. These costs are capitalized and amortized over the initial contract term plus expected renewal periods.

At June 30, 2018, the Company’s capitalized assets related to deferred implementation costs, costs to obtain and costs to fulfill were $39 million, $196 million and $154 million, respectively. Costs to obtain and deferred implementation costs are primarily included in other assets and costs to fulfill are primarily included in other current assets in the Company's consolidated balance sheet. The Company recorded amortization expense of $261 million and $557 million for the three and six month periods ended June 30, 2018, respectively, related to these capitalized costs.

The Company has elected to use the practical expedient and recognizes the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets is one year or less.

2017 - Revenue Recognized Under Guidance in Effect Prior to 2018

Risk and Insurance Services revenue includes insurance commissions, fees for services rendered and interest income on certain fiduciary funds. Insurance commissions and fees for risk transfer services generally were recorded as of the effective date of the applicable policies or, in certain cases (primarily in the Company's reinsurance broking operations), as of the effective date or billing date, whichever is later. A reserve for policy cancellation was provided based on historic and current data on cancellations. Consideration for fee arrangements covering multiple insurance placements, the provision of risk management and/or other services was allocated to all deliverables on the basis of the relative selling prices. Fees for non-risk transfer services provided to clients are recognized over the period in which the services are provided, using a proportional performance model. Fees resulting from achievement of certain performance thresholds are recorded when such levels are attained and such fees are not subject to forfeiture.

In the Consulting segment, the adoption of the new revenue standard did not have a significant impact on the timing of revenue recognition in the quarter.

See Note 17 for further discussion on the impact the new revenue recognition standard has on the Company's consolidated statements of income when comparing the 2018 financial information versus 2017.

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. Unremitted insurance premiums and claims proceeds are held by the Company in a fiduciary capacity. Risk and Insurance Services revenue includes interest on fiduciary funds of$15 million and $28 million for the three and six months ended June 30, 2018, respectively, and $9 million and $17 million for the three and six month periods ended June 30, 2017, respectively. The Consulting segment recorded fiduciary interest income of $1 million and $2 million for the three and six months ended June 30, 2018, respectively, and less than $1 millionand $1 millionfor the three and six months ended June 30,2017, respectively. 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 $8.3 billion at June 30, 2018 and $6.8 billion atDecember 31, 2017. 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

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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 June 30,				Six Months Ended June 30,
(In millions, except per share amounts)	2018		2017		2018		2017
Net income before non-controlling interests	$	536	$	507	$	1,232	$	1,085
Less: Net income attributable to non-controlling interests	5		6		11		15
Net income attributable to the Company	$	531	$	501	$	1,221	$	1,070
Basic weighted average common shares outstanding	507		514		507		514
Dilutive effect of potentially issuable common shares	5		6		6		7
Diluted weighted average common shares outstanding	512		520		513		521
Average stock price used to calculate common stock equivalents	$	81.64	$	75.41	$	82.24	$	73.36

There were 10.5 million and 12.4 million stock options outstanding as of June 30, 2018 and 2017, respectively.

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 six-month periods ended June 30, 2018 and 2017.

(In millions)	2018			2017
Assets acquired, excluding cash	$	204		$	576
Liabilities assumed	(28		)	(74		)
Contingent/deferred purchase consideration	(32		)	(90		)
Net cash outflow for current year acquisitions	$	144		$	412

(In millions)	2018		2017
Interest paid	$	107	$	92
Income taxes paid, net of refunds	$	349	$	297

The classification of contingent consideration in the statement of cash flows is determined by 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 $85 million for the six months ended June 30, 2018. This consisted of deferred purchase consideration related to prior years' acquisitions of $53 million and contingent consideration of $32 million. For the six months ended June 30, 2017, the Company paid deferred and contingent consideration of $97 million, consisting of deferred purchase consideration related to prior years' acquisitions of $37 million and contingent consideration of $60 million.

The following amounts are included in the operating section of the consolidated statements of cash flows. For the six months ended June 30, 2018, the Company recorded an expense for adjustments to contingent consideration liabilities of $11 million and made contingent consideration payments of $9 million. For the six months ended June 30, 2017, the Company recorded a net credit for adjustments to contingent consideration liabilities of $8 million and made contingent consideration payments of $5 million.

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The Company had non-cash issuances of common stock under its share-based payment plan of $128 million and $87 million for the six months ended June 30, 2018 and 2017, respectively. The Company recorded stock-based compensation expense for equity awards related to restricted stock units, performance stock units and stock options of $99 million and $75 million for the six-month periods ended June 30, 2018 and 2017, 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 six-month period ended June 30, 2018 and 2017, including amounts reclassified out of AOCI, are as follows:

(In millions)	Unrealized Investment Gains (Losses)		Pension/Post-Retirement Plans Gains (Losses)			Foreign Currency Translation Gains (Losses)			Total Gains (Losses)
Balance as of April 1, 2018	$	—	$	(2,963	)	$	(942	)	$	(3,905	)
Other comprehensive income (loss) before reclassifications	—		129			(516		)	(387		)
Amounts reclassified from accumulated other comprehensive income	—		27			—			27
Net current period other comprehensive income (loss)	—		156			(516		)	(360		)
Balance as of June 30, 2018	$	—	$	(2,807	)	$	(1,458	)	$	(4,265	)

(In millions)	Unrealized Investment Gains		Pension/Post-Retirement Plans Gains (Losses)			Foreign Currency Translation Gains (Losses)			Total Gains (Losses)
Balance as of April 1, 2017	$	16	$	(3,208	)	$	(1,645	)	$	(4,837	)
Other comprehensive income (loss) before reclassifications	14		(40		)	289			263
Amounts reclassified from accumulated other comprehensive income	—		33			—			33
Net current period other comprehensive income (loss)	14		(7		)	289			296
Balance as of June 30, 2017	$	30	$	(3,215	)	$	(1,356	)	$	(4,541	)

(In millions)	Unrealized Investment Gains (Losses)			Pension/Post-Retirement Plans Gains (Losses)			Foreign Currency Translation Gains (Losses)			Total Gains (Losses)
Balance as of December 31, 2017	$	14		$	(2,892	)	$	(1,165	)	$	(4,043	)
Cumulative effect of amended accounting standard	(14		)	—			—			(14		)
Other comprehensive income (loss) before reclassifications	—			29			(293		)	(264		)
Amounts reclassified from accumulated other comprehensive income	—			56			—			56
Net current period other comprehensive income (loss)	—			85			(293		)	(208		)
Balance as of June 30, 2018	$	—		$	(2,807	)	$	(1,458	)	$	(4,265	)

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(In millions)	Unrealized Investment Gains		Pension/Post-Retirement Plans Gains (Losses)			Foreign Currency Translation Gains (Losses)			Total Gains (Losses)
Balance as of December 31, 2016	$	19	$	(3,232	)	$	(1,880	)	$	(5,093	)
Other comprehensive income (loss) before reclassifications	11		(46		)	524			489
Amounts reclassified from accumulated other comprehensive income	—		63			—			63
Net current period other comprehensive income (loss)	11		17			524			552
Balance as of June 30, 2017	$	30	$	(3,215	)	$	(1,356	)	$	(4,541	)

The components of other comprehensive income (loss) for the three and six-month period ended June 30, 2018 and 2017 are as follows:

Three Months Ended June 30,	2018									2017
(In millions)	Pre-Tax			Tax (Credit)			Net of Tax			Pre-Tax			Tax (Credit)			Net of Tax
Foreign currency translation adjustments	$	(529	)	$	(13	)	$	(516	)	$	290		$	1		$	289
Unrealized investment gains	—			—			—			24			10			14
Pension/post-retirement plans:
Amortization of losses included in net periodic pension cost:
Prior service credits (a)	(1		)	—			(1		)	—			—			—
Net actuarial losses (a)	37			9			28			42			9			33
Subtotal	36			9			27			42			9			33
Effect of remeasurement	—			—			—			—			1			(1		)
Foreign currency translation adjustments	156			27			129			(47		)	(8		)	(39		)
Pension/post-retirement plans gains (losses)	192			36			156			(5		)	2			(7		)
Other comprehensive (loss) income	$	(337	)	$	23		$	(360	)	$	309		$	13		$	296
(a) Components of net periodic pension cost are included in compensation and benefits in the consolidated statements of income. Income tax credits on prior service costs and net actuarial losses are included in income tax expense.

Six Months Ended June 30,	2018									2017
(In millions)	Pre-Tax			Tax (Credit)			Net of Tax			Pre-Tax			Tax (Credit)			Net of Tax
Foreign currency translation adjustments	$	(301	)	$	(8	)	$	(293	)	$	525		$	1		$	524
Unrealized investment gains	—			—			—			19			8			11
Pension/post-retirement plans:
Amortization of losses included in net periodic pension cost:
Prior service credits (a)	(2		)	—			(2		)	—			—			—
Net actuarial losses (a)	74			16			58			82			19			63
Subtotal	72			16			56			82			19			63
Effect of remeasurement	—			—			—			9			3			6
Effect of curtailment	—			—			—			(1		)	—			(1		)
Effect of settlement	—			—			—			1			—			1
Foreign currency translation adjustments	36			7			29			(62		)	(11		)	(51		)
Other	—			—			—			(1		)	—			(1		)
Pension/post-retirement plans gains	108			23			85			28			11			17
Other comprehensive (loss) income	$	(193	)	$	15		$	(208	)	$	572		$	20		$	552
(a) Components of net periodic pension cost are included in other net benefit credits in the consolidated statements of income. Tax on prior service costs and net actuarial losses is included in income tax expense.

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8.     Acquisitions

The Company's strategy includes growing its businesses and building shareholder value through strategic acquisitions. 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 lists, developed technology, trademarks and non-compete agreements. The valuation of purchased intangible assets involves significant estimates and assumptions. 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 seven acquisitions during the first six months of 2018.

• February – MMA acquired Highsmith Insurance Agency, a North Carolina-based independent insurance brokerage firm.

• March – Marsh acquired Hoken Soken, Inc., a Japan-based insurance agency.

• May – Marsh acquired Mountlodge Limited, a Scotland-based independent insurance broker and Lorant Martínez Salas y Compañía Agente de Seguros y de Fianzas, S.A. de C.V., a Mexico-based multi-line insurance broker.

• June – MMA acquired Bleakley Insurance Services, a California-based provider of employee benefits solutions; Klein Agency, Inc., a Minnesota-based surety and property/casualty agency; and Insurance Associates, Inc., a Maryland-based independent insurance agency.

The Consulting segment completed five acquisitions during the first six months of 2018.

• January – Oliver Wyman acquired Draw Ltd., a U.K.-based digital transformation agency.

• March – Oliver Wyman acquired 8Works Limited, a U.K.-based design thinking consultancy.

• May – Mercer acquired EverBe SAS, a France-based Workday implementer and advisory firm; and Evolve Intelligence Pty Ltd., an Australia-based talent strategy firm.

• June – Mercer acquired India Life Capital Private Ltd., an India-based investment advisor.

Total purchase consideration for acquisitions made during the six months ended June 30, 2018 was $192 million, which consisted of cash paid of $160 million and deferred purchase and estimated contingent consideration of $32 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 fair value of the contingent consideration was based on projected revenue or EBITDA of the acquired entities. Estimated fair values of assets acquired and liabilities assumed are subject to adjustment when purchase accounting is finalized. The Company also paid $53 million of deferred purchase consideration and $41 million of contingent consideration related to acquisitions made in prior years.

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The following table presents the preliminary allocation of the acquisition cost to the assets acquired and liabilities assumed during 2018 based on their fair values:

For the Six Months Ended June 30, 2018
(In millions)
Cash	$	160
Estimated fair value of deferred/contingent consideration	32
Total Consideration	$	192
Allocation of purchase price:
Cash and cash equivalents	$	16
Accounts receivable, net	12
Property, plant, and equipment	3
Other intangible assets	73
Goodwill	116
Total assets acquired	220
Current liabilities	10
Other liabilities	18
Total liabilities assumed	28
Net assets acquired	$	192

Other intangible assets acquired are based on initial estimates and subject to change based on final valuations during the measurement period post acquisition date. The following chart provides information about other intangible assets acquired during 2018:

	Amount		Weighted Average Amortization Period
Client relationships	$	72	9 years
Other	1		4 years
	$	73

Prior-Year Acquisitions

The Risk and Insurance Services segment completed seven acquisitions during 2017.

• January – MMA acquired J. Smith Lanier & Co. ("JSL"), a privately held insurance brokerage firm providing insurance, risk management, and employee benefits solutions to businesses and individuals throughout the U.S.

• February – MMA acquired iaConsulting, a Texas-based employee benefits consulting firm.

• March – MMA acquired Blakestad, Inc., a Minnesota-based private client and commercial lines insurance agency, and RJF Financial Services, a Minnesota-based retirement advisory firm.

• May – MMA acquired Insurance Partners of Texas, a Texas-based employee benefits consulting firm.

• August – Marsh acquired International Catastrophe Insurance Managers, LLC, a Colorado-based managing general agent providing property catastrophe insurance to business and homeowners, and MMA acquired Hendrick & Hendrick, Inc., a Texas-based insurance agency.

The Consulting segment completed three acquisitions during 2017.

• August – Mercer acquired Jaeson Associates, a Portugal-based talent management consulting organization.

• December – Mercer acquired Promerit AG, a Germany-based consultancy specializing in HR digitalization and business and HR transformation and BFC Asset Management Co., Ltd., a Japan-based independently owned asset manager, focused on alternative investment strategies.

Total purchase consideration for acquisitions made during the first six months of 2017 was $510 million, which consisted of cash paid of $420 million and deferred purchase and estimated contingent consideration of $90 million. Contingent consideration arrangements are primarily based on EBITDA or revenue targets over a period of two to

20

four years. The fair value of the contingent consideration was based on projected revenue or earnings of the acquired entities. Estimated fair values of assets acquired and liabilities assumed are subject to adjustment when purchase accounting is finalized. In the first six months of 2017, the Company also paid $37 million of deferred purchase consideration and $65 million of contingent consideration related to acquisitions made in prior years.

Pro-Forma Information

The following unaudited pro-forma financial data gives effect to the acquisitions made by the Company during 2018 and 2017. In accordance with accounting guidance related to pro-forma disclosures, the information presented for current year acquisitions is as if they occurred on January 1, 2017 and reflects acquisitions made in 2017 as if they occurred on January 1, 2016. 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 June 30,				Six Months Ended June 30,
(In millions, except per share figures)	2018		2017		2018		2017
Revenue	$	3,748	$	3,539	$	7,770	$	7,098
Net income attributable to the Company	$	532	$	503	$	1,225	$	1,072
Basic net income per share attributable to the Company	$	1.05	$	0.98	$	2.41	$	2.08
Diluted net income per share attributable to the Company	$	1.04	$	0.97	$	2.39	$	2.06

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 six month periods ended June 30, 2018 include approximately $11 million and $14 million of revenue, respectively, and an operating loss of $1 million and $2 million, respectively, for acquisitions made in 2018. The consolidated statements of income for the three and six month periods ended June 30, 2017 included $34 million and $63 million of revenue, respectively, and operating income of $5 million and $15 million, respectively, related to acquisitions made in 2017.

Subsequent Events

On June 25th, the Company announced an agreement to acquire Wortham Insurance, a Houston based independent insurance broker with more than $130 million of revenue and 530colleagues. The transaction is expected to close in the third quarter of 2018.

In July, 2018, the Company entered into a agreement to sell Marsh ClearSight, a cloud based technology platform. The disposal of Marsh ClearSight is not expected to have a significant impact on the Company’s ongoing revenue or results of operations.

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, the Company assesses qualitative factors to determine whether it is necessary to perform the two-step goodwill impairment test. As part of its assessment, the Company considers numerous factors, including that the fair value of each reporting unit exceeds its carrying value by a substantial margin based on its most recent estimates, 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 2017 and concluded that a two-step goodwill impairment test was not required in 2017 and that goodwill was not impaired.

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Changes in the carrying amount of goodwill are as follows:

June 30,
(In millions)	2018			2017
Balance as of January 1,	$	9,089		$	8,369
Goodwill acquired	116			370
Other adjustments(a)	(28		)	82
Balance at June 30,	$	9,177		$	8,821

^(a) Primarily reflects the impact of foreign exchange.

Goodwill allocable to the Company’s reportable segments at June 30, 2018 is as follows: Risk and Insurance Services, $6.5 billion and Consulting, $2.7 billion.

Other intangible assets that are not deemed to have an indefinite life are amortized over their estimated lives and reviewed for impairment upon the occurrence of certain triggering events in accordance with applicable accounting literature.

The gross cost and accumulated amortization at June 30, 2018 and December 31, 2017 are as follows:

	June 30, 2018						December 31, 2017
(In millions)	Gross Cost		Accumulated Amortization		Net Carrying Amount		Gross Cost		Accumulated Amortization		Net Carrying Amount
Client Relationships	$	1,711	$	580	$	1,131	$	1,672	$	518	$	1,154
Other (a)	237		134		103		234		114		120
Amortized intangibles	$	1,948	$	714	$	1,234	$	1,906	$	632	$	1,274

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

Aggregate amortization expense for the six months ended June 30, 2018 and2017 was $88 million and $80 million, respectively. The estimated future aggregate amortization expense is as follows:

For the Years Ending December 31,
(In millions)	Estimated Expense
2018 (excludes amortization through June 30, 2018)	$	94
2019	173
2020	154
2021	143
2022	132
Subsequent years	538
	$	1,234

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.

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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).

The Company does not have any assets or liabilities that are measured using Level 2 inputs.

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.

Liabilities measured using Level 3 inputs include liabilities for contingent purchase consideration.

Valuation Techniques

Equity Securities, Money Market 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 funds are valued using a valuation technique that results in price per share at $1.00.

Contingent Purchase Consideration Liability – Level 3

Purchase consideration for some acquisitions made by the Company includes contingent consideration arrangements. These arrangements typically provide for the payment of additional consideration if earnings or revenue targets are met over periods from two to four years. The fair value of the contingent purchase consideration 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 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 June 30, 2018 and December 31, 2017.

	Identical Assets (Level 1)				Observable Inputs (Level 2)				Unobservable Inputs (Level 3)				Total
(In millions)	06/30/18		12/31/17		06/30/18		12/31/17		06/30/18		12/31/17		06/30/18		12/31/17
Assets:
Financial instruments owned:
Exchange traded equity securities(a)	$	99	$	81	$	—	$	—	$	—	$	—	$	99	$	81
Mutual funds(a)	144		158		—		—		—		—		144		158
Money market funds(b)	33		143		—		—		—		—		33		143
Total assets measured at fair value	$	276	$	382	$	—	$	—	$	—	$	—	$	276	$	382
Fiduciary Assets:
Money market funds	$	129	$	111	$	—	$	—	$	—	$	—	$	129	$	111
Total fiduciary assets measured at fair value	$	129	$	111	$	—	$	—	$	—	$	—	$	129	$	111
Liabilities:
Contingent purchase consideration liability(c)	$	—	$	—	$	—	$	—	$	185	$	189	$	185	$	189
Total liabilities measured at fair value	$	—	$	—	$	—	$	—	$	185	$	189	$	185	$	189

^(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 accounts payable and accrued liabilities and other liabilities in the consolidated balance sheets.

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During the six-month period ended June 30, 2018, there were no assets or liabilities that were transferred between any of the levels.

The table below sets forth a summary of the changes in fair value of the Company’s Level 3 liabilities for the three and six month periods ending June 30, 2018 and 2017 that represent contingent consideration related to acquisitions:

	Three Months Ended June 30,						Six Months Ended June 30,
(In millions)	2018			2017			2018			2017
Balance at beginning of period,	$	161		$	247		$	189		$	241
Additions	20			—			26			34
Payments	(1		)	(53		)	(41		)	(65		)
Revaluation Impact	6			8			11			(8		)
Other (a)	(1		)	1			—			1
Balance at June 30,	$	185		$	203		$	185		$	203

^(a) Primarily reflects the impact of foreign exchange.

The fair value of the contingent purchase consideration liability is based on projections of revenue and EBITDA for the acquired entities in relation to the established targets and is reassessed on a quarterly basis. As set forth in the table above, based on the Company's ongoing assessment of the fair value of contingent consideration, the Company recorded a net increase in the estimated fair value of such liabilities for prior-period acquisitions of $11 million in the six-month period ended June 30, 2018. A 5% increase in the above mentioned projections would increase the liability by approximately $22 million. A 5% decrease in the above mentioned projections would decrease the liability by approximately $23 million.

Long-Term Investments

The Company holds investments in certain private equity investments, public companies and private companies that are accounted for using the equity method of accounting. The carrying value of these investments was $391 million and $405 million at June 30, 2018 and December 31, 2017, respectively.

Investments Accounted For Using the Equity Method of Accounting

Investments in Public and Private Companies

Alexander Forbes: The Company owns approximately 33% of the common stock of Alexander Forbes, a South African company listed on the Johannesburg Stock Exchange, which it purchased in 2014 for 7.50 South African Rand per share. As of June 30, 2018, the carrying value of the Company’s investment in Alexander Forbes was approximately $246 million. As of June 30, 2018, the market value of the approximately 443 million shares of Alexander Forbes owned by the Company, based on the June 30, 2018 closing share price of 5.77 South African Rand per share, was approximately $188 million. The Company considered several factors in assessing its investment in Alexander Forbes, including its financial position, the near- and long-term prospects of Alexander Forbes and the broader South African economy and capital markets, the length of time and extent to which the market value was below cost and the Company’s intent and ability to retain the investment for a sufficient period of time to allow for anticipated recovery in market value. During the first six months of 2018, the Alexander Forbes average opening and closing stock price was approximately 6.66 Rand (approximately 89% of the original purchase price) and ranged from a low of 5.00 Rand (in mid June) to a high of 7.34 Rand (in late March) (approximately 67% to 98% of the purchase price) and traded within 10% of its purchase price as recently as early-June. The trading price declined further during July, 2018. Based on its assessment of the factors discussed above, in particular the relatively short period during which the shares traded significantly below their purchase price, and the Company’s intention to continue to hold the shares for a period of time sufficient to allow for recovery, the Company determined the investment was not impaired. However, if the share price does not recover in future periods, an impairment charge for an "other than temporary" decline in value of its investment could be incurred.

The Company has other investments in private insurance and consulting companies with a carrying value of $63 million at both June 30, 2018 and December 31, 2017.

The Company’s investment in Alexander Forbes and its other equity investments in private insurance and consulting companies 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

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consolidated balance sheets. The Company records its share of income or loss on its equity method investments on a one quarter lag basis.

Private Equity Investments

The Company's investments in private equity funds were $82 million and $76 million at June 30, 2018 and December 31, 2017, 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.

Other Investments

At June 30, 2018 the Company held certain equity investments with readily determinable market values of $113 million. During the first six months of 2018, the Company recorded an investment gain of $19 million, which reflects the increase in the market value of these investments as compared to December 31, 2017. The Company also holds investments without readily determinable market values of $64 million at June 30, 2018.

11.    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. Plan was 64% equities and equity alternatives and 36% fixed income and at June 30, 2018 the actual allocation for the Company's U.S. Plan was 63% equities and equity alternatives and 37% fixed income. The target allocation for the U.K. Plans at June 30, 2018 was34% equities and equity alternatives and 66% fixed income. At June 30, 2018, the actual allocation for the U.K. Plans was 35% equities and equity alternatives and 65% fixed income. The Company's U.K. Plans comprised approximately 81% of non-U.S. plan assets at December 31, 2017. 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 and other post-retirement plans are as follows:

Combined U.S. and significant non-U.S. plans	Pension Benefits						Post-retirement Benefits
For the Three Months Ended June 30,
(In millions)	2018			2017			2018			2017
Service cost	$	7		$	19		$	—		$	—
Interest cost	117			124			1			1
Expected return on plan assets	(218		)	(230		)	—			—
Amortization of prior service cost	(1		)	(1		)	(1		)	—
Recognized actuarial loss	37			43			—			—
Net periodic benefit (credit) cost	$	(58	)	$	(45	)	$	—		$	1
Combined U.S. and significant non-U.S. plans	Pension Benefits						Post-retirement Benefits
For the Six Months Ended June 30,
(In millions)	2018			2017			2018			2017
Service cost	$	17		$	37		$	—		$	—
Interest cost	235			246			2			2
Expected return on plan assets	(439		)	(454		)	—			—
Amortization of prior service (credit) cost	(1		)	(1		)	(2		)	1
Recognized actuarial loss	74			83			—			—
Net periodic benefit (credit) cost	$	(114	)	$	(89	)	$	—		$	3
Curtailment gain	—			(1		)	—			—
Settlement loss	—			1			—			—
Total (credit) cost	$	(114	)	$	(89	)	$	—		$	3

As discussed in Note 17, effective January 1, 2018, the Company adopted the new guidance that changes the presentation of net periodic pension cost and net periodic postretirement cost (''net periodic benefit costs"). The new guidance requires employers to report the service cost component of net periodic benefit costs in the same line item as other compensation costs in the income statement. The other components of net periodic benefit costs are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations. The new guidance requires retrospective application for the presentation of the service cost component and the other components of net periodic benefit costs. Accordingly, the Company has reclassified prior period information in the following chart to conform with the current year's presentation:

Amounts Recorded in the Consolidated Statement of Income
Combined U.S. and significant non-U.S. plans	Pension Benefits						Post-retirement Benefits
For the Three Months Ended June 30,
(In millions)	2018			2017			2018		2017
Compensation and benefits expense (Operating income)	$	7		$	19		$	—	$	—
Other net benefit credits	(65		)	(64		)	—		1
Total (credit) cost	$	(58	)	$	(45	)	$	—	$	1

Amounts Recorded in the Consolidated Statement of Income
Combined U.S. and significant non-U.S. plans	Pension Benefits						Post-retirement Benefits
For the Six Months Ended June 30,
(In millions)	2018			2017			2018		2017
Compensation and benefits expense (Operating income)	$	17		$	37		$	—	$	—
Other net benefit credits	(131		)	(126		)	—		3
Total (credit) cost	$	(114	)	$	(89	)	$	—	$	3

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U.S. Plans only	Pension Benefits						Post-retirement Benefits
For the Three Months Ended June 30,
(In millions)	2018			2017			2018			2017
Service cost	$	—		$	—		$	—		$	—
Interest cost	59			66			1			1
Expected return on plan assets	(90		)	(90		)	—			—
Amortization of prior service (credit) cost	—			—			(1		)	1
Recognized actuarial loss (gain)	14			10			—			(1		)
Net periodic benefit (credit) cost	$	(17	)	$	(14	)	$	—		$	1

U.S. Plans only	Pension Benefits						Post-retirement Benefits
For the Six Months Ended June 30,
(In millions)	2018			2017			2018			2017
Service cost	$	—		$	—		$	—		$	—
Interest cost	118			132			1			1
Expected return on plan assets	(179		)	(179		)	—			—
Amortization of prior service (credit) cost	—			—			(1		)	2
Recognized actuarial loss (gain)	27			19			—			(1		)
Net periodic benefit (credit) cost	$	(34	)	$	(28	)	$	—		$	2

Significant non-U.S. plans only	Pension Benefits						Post-retirement Benefits
For the Three Months Ended June 30,
(In millions)	2018			2017			2018		2017
Service cost	$	7		$	19		$	—	$	—
Interest cost	58			58			—		—
Expected return on plan assets	(128		)	(140		)	—		—
Amortization of prior service cost	(1		)	(1		)	—		(1		)
Recognized actuarial loss	23			33			—		1
Net periodic benefit (credit) cost	$	(41	)	$	(31	)	$	—	$	—

Significant non-U.S. plans only	Pension Benefits						Post-retirement Benefits
For the Six Months Ended June 30,
(In millions)	2018			2017			2018			2017
Service cost	$	17		$	37		$	—		$	—
Interest cost	117			114			1			1
Expected return on plan assets	(260		)	(275		)	—			—
Amortization of prior service credit	(1		)	(1		)	(1		)	(1		)
Recognized actuarial loss	47			64			—			1
Net periodic benefit (credit) cost	$	(80	)	$	(61	)	$	—		$	1
Curtailment gain	—			(1		)	—			—
Settlement loss	—			1			—			—
Total (credit) cost	$	(80	)	$	(61	)	$	—		$	1

In March 2017, the Company modified its defined benefit pension plans in Canada to discontinue further benefit accruals for participants after December 31, 2017 and replaced them with a defined contribution arrangement. The Company also amended its post-retirement benefits plan in Canada so that individuals who retire after April 1, 2019 will not be eligible to participate, except in certain situations. The Company re-measured the assets and liabilities of the plans, based on assumptions and market conditions on the amendment date.

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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				Post-retirement Benefits
June 30,	2018		2017		2018		2017
Weighted average assumptions:
Expected return on plan assets	5.83	%	6.64	%	—		—
Discount Rate	3.07	%	3.40	%	3.21	%	3.64	%
Rate of compensation increase	1.73	%	1.77	%	—		—

The Company made approximately $55 million of contributions to its U.S. and non-U.S. defined benefit plans in the first six months of 2018. The Company expects to contribute approximately $54 million to its U.S. pension and non-U.S. pension plans during the remainder of 2018.

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 $67 million and $65 million for the six months ended June 30, 2018 and 2017, respectively. The cost of the U.K. DC Plans was $42 million and $38 million for the six months ended June 30, 2018 and 2017, respectively.

12.    Debt

The Company’s outstanding debt is as follows:

(In millions)	June 30, 2018		December 31, 2017
Short-term:
Commercial paper	$	175	$	—
Current portion of long-term debt	264		262
	439		262
Long-term:
Senior notes – 2.55% due 2018	250		250
Senior notes – 2.35% due 2019	299		299
Senior notes – 2.35% due 2020	499		498
Senior notes – 4.80% due 2021	498		498
Senior notes – 2.75% due 2022	497		496
Senior notes – 3.30% due 2023	348		348
Senior notes – 4.05% due 2023	248		248
Senior notes – 3.50% due 2024	597		596
Senior notes – 3.50% due 2025	496		496
Senior notes – 3.75% due 2026	596		596
Senior notes – 5.875% due 2033	297		297
Senior notes – 4.35% due 2047	492		492
Senior notes – 4.20% due 2048	592		—
Mortgage – 5.70% due 2035	364		370
Other	4		3
	6,077		5,487
Less current portion	264		262
	$	5,813	$	5,225

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

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The Company has established a short-term debt financing program of up to $1.5 billion through the issuance of commercial paper. The proceeds from the issuance of commercial paper are used for general corporate purposes. The Company had $175 million of commercial paper outstanding at June 30, 2018 at an effective interest rate of 2.25%.

In March 2018, the Company issued $600 million of 4.20% senior notes due 2048. The Company used the net proceeds for general corporate purposes.

In January 2017, the Company issued $500 million of 2.75% senior notes due 2022 and $500 million of 4.35% senior notes due 2047. The Company used the net proceeds for general corporate purposes, including the repayment of a $250 million debt maturity in April 2017.

The Company and certain of its foreign subsidiaries maintain a $1.5 billion multi-currency five-year unsecured revolving credit facility. The interest rate on this facility is based on LIBOR plus a fixed margin which varies with the Company's credit ratings. This facility expires in November 2020 and requires the Company to maintain certain coverage and leverage ratios which are tested quarterly. There were no borrowings outstanding under this facility at June 30, 2018.

Fair Value of Short-term and Long-term Debt

The estimated fair value of the Company’s short-term and long-term debt is provided below. Certain estimates and judgments were required to develop the fair value amounts. The fair value amounts shown below 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.

	June 30, 2018				December 31, 2017
(In millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Short-term debt	$	439	$	440	$	262	$	264
Long-term debt	$	5,813	$	5,826	$	5,225	$	5,444

The fair value of the Company’s short-term debt consists primarily of commercial paper and term debt maturing within the next year and its fair value approximates its carrying value. The estimated fair value of a primary portion 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- and long-term debt would be classified as Level 2 in the fair value hierarchy.

13.    Restructuring Costs

During the second quarter of 2018, Marsh initiated a program to simplify the organization through reduced management layers and more common structures across regions and businesses to more closely align with its more formalized segmentation strategy across large risk management, middle market corporate, and small commercial & personal segments. These efforts are expected to create increased efficiencies and additional capacity for reinvestment in people and technology. During the quarter ended June 30, 2018, the Company incurred restructuring severance and consulting costs of $55 million related to this initiative.

In addition to the changes discussed above, the Company incurred $9 million of restructuring costs related to severance and future rent under non-cancelable leases. These costs were incurred in Risk and Insurance Services ($3 million), Consulting ($1 million) and Corporate ($5 million).

Details of the restructuring activity from January 1, 2017 through June 30, 2018, which includes liabilities from actions prior to 2018, are as follows:

(In millions)	Liability at 1/1/17		Amounts Accrued		Cash Paid			Other		Liability at 12/31/17		Amounts Accrued		Cash Paid			Other			Liability at 6/30/18
Severance	$	32	$	31	$	(49	)	$	1	$	15	$	51	$	(22	)	$	(1	)	$	43
Future rent under non-cancelable leases and other costs	61		9		(22		)	2		50		13		(19		)	—			44
Total	$	93	$	40	$	(71	)	$	3	$	65	$	64	$	(41	)	$	(1	)	$	87

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The expenses associated with the above 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.

14.    Common Stock

During the first six months of 2018, the Company repurchased approximately 6.1 million shares of its common stock for consideration of $500 million. In November 2016, 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. As of June 30, 2018, the Company remained authorized to repurchase up to approximately $1 billion in shares of its common stock. There is no time limit on the authorization. During the first six months of 2017, the Company repurchased approximately 5.4 million shares of its common stock for consideration of $400 million.

The Company issued approximately 2.5 million and 3.7 million shares related to stock compensation and employee stock purchase plans during the first six months of 2018 and 2017, respectively.

15.    Claims, Lawsuits and Other Contingencies

Litigation Matters

The Company and its subsidiaries are subject to a significant number of claims, lawsuits and proceedings in the ordinary course of 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 may 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 Group, 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.

Governmental Inquiries and Enforcement Matters

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

Risk and Insurance Services Segment

In April 2017, the Financial Conduct Authority in the United Kingdom (the "FCA") commenced a civil competition investigation into the aviation insurance and reinsurance sector. In connection with that investigation, the FCA carried out an on-site inspection at the London office of Marsh Limited, our Marsh and Guy Carpenter operating subsidiary in the United Kingdom. The FCA indicated that it had reasonable grounds for suspecting that Marsh Limited and other participants in the market have been sharing competitively sensitive information within the aviation insurance and reinsurance broking sector.

In October 2017, the Company received a notice that the Directorate-General for Competition of the European Commission had commenced a civil investigation of a number of insurance brokers, including Marsh, regarding "the exchange of commercially sensitive information between competitors in relation to aviation and aerospace insurance and reinsurance broking products and services in the European Economic Area ("EEA"), as well as possible coordination between competitors." In light of the action taken by the European Commission, the FCA informed Marsh Limited at the same time that it has discontinued its investigation under U.K. competition law. In May 2018, the FCA advised that it would not be taking any further action with Marsh Limited in connection with this matter.

In July 2017, the Directorate-General for Competition of the European Commission together with the Irish Competition and Consumer Protection Commission conducted on-site inspections at the offices of Marsh and other

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industry participants in Dublin in connection with an investigation regarding the "possible participation in anticompetitive agreements and/or concerted practices contrary to [E.U. competition law] in the market for commercial motor insurance in the Republic of Ireland."

We are cooperating with these investigations and are conducting our own reviews. At this time, we are unable to predict their likely timing, outcome or ultimate impact. There can be no assurance that the ultimate resolution of these or any related matters will not have a material adverse effect on our consolidated results of operations, financial condition or cash flows.

In November 2017, the FCA announced the terms of reference for a market study concerning the wholesale insurance broker sector in the United Kingdom, which affects Marsh and Guy Carpenter. The FCA is conducting the study to assess "how effectively competition is working in the wholesale insurance broker sector" and "how brokers influence competition in the underwriting sector." The FCA is expected to publish its interim report by the end of 2018, with a final report expected in 2019.

Consulting Segment

In June 2017, the FCA issued a final report in connection with a market study of the U.K. asset management industry, which includes asset managers and investment consultants, including Mercer. Following the report, in September 2017, the FCA announced its decision to refer the investment consultancy and fiduciary management markets to the U.K. Competition & Markets Authority (the "CMA") for a market investigation. In July 2018, the CMA published its Provisional Decision recommending industry-wide changes involving (i) implementation of mandatory tendering, (ii) enhanced fee disclosures and (iii) common standards for reporting performance. The CMA expects to conclude its investigation of the investment consultancy and fiduciary management markets not later than March 2019.

In the ordinary course of business, the Company is also subject to other investigations, market studies, subpoenas, lawsuits and other regulatory actions undertaken by governmental authorities.

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 were reinsured up to £40 million by a related party of River Thames. Payment of claims under the reinsurance agreement is collateralized by segregated assets held in a trust. As of June 30, 2018, the reinsurance coverage exceeded the best estimate of the projected liability of the policies covered by the guarantee. 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 15 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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16.    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 2017 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 six-month periods ended June 30, 2018 and 2017 are as follows:

	Three Months Ended June 30,							Six Months Ended June 30,
(In millions)	Revenue				Operating Income (Loss)			Revenue				Operating Income (Loss)
2018–
Risk and Insurance Services	$	2,096		(a)	$	472		$	4,440		(c)	$	1,188
Consulting	1,650			(b)	267			3,318			(d)	514
Total Operating Segments	3,746				739			7,758				1,702
Corporate / Eliminations	(12		)		(48		)	(24		)		(103		)
Total Consolidated	$	3,734			$	691		$	7,734			$	1,599
2017–
Risk and Insurance Services	$	1,916		(a)	$	482		$	3,905		(c)	$	1,050
Consulting	1,592			(b)	265			3,118			(d)	490
Total Operating Segments	3,508				747			7,023				1,540
Corporate / Eliminations	(13		)		(46		)	(25		)		(90		)
Total Consolidated	$	3,495			$	701		$	6,998			$	1,450

^(a)Includes inter-segment revenue of $4 million in 2017, interest income on fiduciary funds of $15 million and $9 million in 2018 and 2017, respectively, and equity method income of $7 million in both 2018 and 2017.

^(b)Includes inter-segment revenue of $12 million and $9 million in 2018 and 2017, respectively, interest income on fiduciary funds of $1 million and less than $1 million in 2018and2017, respectively, and equity method income of $5 million in both 2018 and in 2017.

^(c) Includes inter-segment revenue of $1 million and $4 million in 2018 and 2017, respectively, interest income on fiduciary funds of $28 million and $17 million in 2018 and 2017, respectively, and equity method income of $6 million and $9 million in 2018 and 2017, respectively.

^(d) Includes inter-segment revenue of $23 million and $21 million in 2018 and 2017, respectively, interest income on fiduciary funds of $2 million and $1 million in 2018 and 2017, respectively, and equity method income of $8 million in 2018 and $9 million in 2017, respectively.

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Details of operating segment revenue for the three and six-month periods ended June 30, 2018 and 2017 are as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
(In millions)	2018			2017			2018			2017
Risk and Insurance Services
Marsh	$	1,760		$	1,621		$	3,463		$	3,223
Guy Carpenter	336			295			977			682
Total Risk and Insurance Services	2,096			1,916			4,440			3,905
Consulting
Mercer	1,158			1,109			2,329			2,186
Oliver Wyman Group	492			483			989			932
Total Consulting	1,650			1,592			3,318			3,118
Total Operating Segments	3,746			3,508			7,758			7,023
Corporate / Eliminations	(12		)	(13		)	(24		)	(25		)
Total	$	3,734		$	3,495		$	7,734		$	6,998

17.    New Accounting Guidance

New Accounting Pronouncements Effective January 1, 2018:

The following new accounting standards were adopted using a modified retrospective approach through a cumulative-effect adjustment to retained earnings as of January 1, 2018:

New Revenue Recognition Standard

In May 2014, the FASB issued new accounting guidance related to revenue from contracts with customers. The core principle of the 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 Company adopted the new guidance effective January 1, 2018, using the modified retrospective method, which applies the new guidance beginning with the year of adoption, with the cumulative effect of initially applying the guidance recognized as an adjustment to retained earnings at January 1, 2018. The Company elected to apply the modified retrospective method to all contracts.

The guidance includes requirements to estimate variable or contingent consideration to be received, which will result in revenue being recognized earlier than under legacy GAAP. In addition, the guidance requires the capitalization and amortization of certain costs which were expensed as incurred under legacy GAAP. As discussed in more detail below, the adoption of this new revenue recognition standard will shift revenue among quarters from historical patterns, but is not expected to have a significant year-over-year impact on annual revenue.

Upon adoption of the new revenue standard, the Company recognized significant movement in the quarterly timing of revenue recognized in the Risk and Insurance Services segment. In particular, under the new standard the recognition of revenue for reinsurance broking was accelerated from historical patterns. Estimated revenue from these treaties is recognized largely at the policy effective date at which point control over the services provided by the Company transfers to the client and the client has accepted the services. This resulted in a significant increase in revenue in the first quarter of 2018 compared to the same period in 2017. Prior to the adoption of this standard, revenue related to most reinsurance placements was recognized on the later of billing or effective date as premiums are determined by the primary insurers and attached to the reinsurance treaties. Typically, this resulted in revenue being recognized over a 12 to 18 month period.

The timing of revenue recognition for certain fee based brokerage arrangements will shift among quarters. However, since the vast majority of the Company's fee arrangements involve contracts that cover a single year of services, the Company does not expect there will be a significant change in the amount of revenue recognized in an annual period.

In the Risk and Insurance Services segment, certain pre-placement costs are now deferred and amortized into earnings when revenue from the placement is recognized. These costs were previously expensed as incurred. As such, the Company expects the recognition of costs to shift among quarters.

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In the Consulting segment, the adoption of the new revenue standard will not have a significant impact on the timing of revenue recognition in quarterly or annual periods.

In Consulting, the Company incurs implementation costs necessary to facilitate the delivery of the contracted services. The Company has concluded that certain additional implementation costs previously expensed under legacy GAAP will be deferred under the new guidance. In addition, the amortization period for these implementation costs will include the initial contract term plus expected renewals.

The cumulative effect of adopting the standard, net of tax, on January 1, 2018 resulted in an increase to the opening balance of retained earnings of $364 million, with offsetting increases/decreases to other balance sheet accounts, e.g. accounts receivable, other assets and deferred income taxes. The comparative prior period information was not restated and will continue to be reported under the legacy accounting standards that were in effect for those periods.

The impact of adoption of the new revenue standard on the Company's consolidated income statement was as follows (in millions):

	Three Months Ended June 30,									Six Months Ended June 30,
	As Reported			Revenue Standard Impact			Legacy GAAP			As Reported			Revenue Standard Impact			Legacy GAAP
Revenue	$	3,734		$	(24	)	$	3,710		$	7,734		$	(185	)	$	7,549
Expense:
Compensation and Benefits	2,135			(10		)	2,125			4,359			(70		)	4,289
Other Operating Expenses	908			—			908			1,776			—			1,776
Operating Expenses	3,043			(10		)	3,033			6,135			(70		)	6,065
Operating Income	691			(14		)	677			1,599			(115		)	1,484
Other Net Benefit Credits	65			—			65			131			—			131
Interest Income	3			—			3			6			—			6
Interest Expense	(68		)	—			(68		)	(129		)	—			(129		)
Investment Income	28			—			28			28			—			28
Income Before Income Taxes	719			(14		)	705			1,635			(115		)	1,520
Income Tax Expense	183			(4		)	179			403			(30		)	373
Net Income Before Non-Controlling Interests	536			(10		)	526			1,232			(85		)	1,147
Less: Net Income Attributable to Non-Controlling Interests	5			—			5			11			—			11
Net Income Attributable to the Company	$	531		$	(10	)	$	521		$	1,221		$	(85	)	$	1,136

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The impact of adoption of the new revenue standard on the Company's consolidated balance sheet was as follows (in millions):

	June 30, 2018
	As Reported			Revenue Standard Impact			Legacy GAAP
ASSETS
Current assets:
Cash and cash equivalents	$	1,036		$	—		$	1,036
Net receivables	4,601			(254		)	4,347
Other current assets	538			(298		)	240
Total current assets	6,175			(552		)	5,623
Goodwill and intangible assets	10,411			—			10,411
Fixed assets, net	698			—			698
Pension related assets	1,808			—			1,808
Deferred tax assets	532			133			665
Other assets	1,535			(230		)	1,305
TOTAL ASSETS	$	21,159		$	(649	)	$	20,510
LIABILITIES AND EQUITY
Current liabilities:
Short-term debt	$	439		$	—		$	439
Accounts payable and accrued liabilities	2,246			(177		)	2,069
Accrued compensation and employee benefits	1,103			—			1,103
Accrued income taxes	216			—			216
Dividends payable	212			—			212
Total current liabilities	4,216			(177		)	4,039
Fiduciary liabilities	5,118			—			5,118
Less - cash and investments held in a fiduciary capacity	(5,118		)	—			(5,118		)
	—			—			—
Long-term debt	5,813			—			5,813
Pension, post-retirement and post-employment benefits	1,768			—			1,768
Liabilities for errors and omissions	303			—			303
Other liabilities	1,262			(23		)	1,239
Total equity	7,797			(449		)	7,348
TOTAL LIABILITIES AND EQUITY	$	21,159		$	(649	)	$	20,510

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The impact of adoption of the new revenue standard on the Company's consolidated statement of cash flow was as follows (in millions):

	Six Months Ended June 30, 2018
	As Reported			Revenue Standard Impact			Legacy GAAP
Operating cash flows:
Net income before non-controlling interests	$	1,232		$	(85	)	$	1,147
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization of fixed assets and capitalized software	159			—			159
Amortization of intangible assets	88			—			88
Adjustments and payments related to contingent consideration liability	2			—			2
Provision for deferred income taxes	34			—			34
Gain on investments	(28		)	—			(28		)
Gain on disposition of assets	(1		)	—			(1		)
Share-based compensation expense	99			—			99
Changes in assets and liabilities:
Net receivables	(388		)	186			(202		)
Other current assets	4			(20		)	(16		)
Other assets	(10		)	(26		)	(36		)
Accounts payable and accrued liabilities	30			(55		)	(25		)
Accrued compensation and employee benefits	(614		)	—			(614		)
Accrued income taxes	18			—			18
Contributions to pension excess of expense/credit	(178		)	—			(178		)
Other liabilities	(10		)	—			(10		)
Effect of exchange rate changes	(24		)	—			(24		)
Net cash provided by operations	$	413		$	—		$	413

Theadoption of the revenue recognition standard did not have an impact on the Company's financing or investing cash flows.

Other Standards Adopted Effective January 1, 2018 using the modified retrospective approach

In January 2016, the FASB issued new guidance intended to improve the recognition and measurement of financial instruments. The new guidance requires investments in equity securities (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income; requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (i.e., securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; eliminates the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; and requires a reporting organization to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk (also referred to as "own credit") when the organization has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. The new guidance was effective for public companies for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company holds certain equity investments that under legacy GAAP were previously treated as available for sale securities, whereby the mark-to-market change was recorded to other comprehensive income in its consolidated balance sheet. The

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Company adopted the new accounting guidance, effective January 1, 2018, recording a cumulative-effect adjustment increase to retained earnings as of the beginning of the period of adoption of $14 million, reflecting the reclassification of cumulative unrealized gains, net of tax as of December 31, 2017 from accumulated other comprehensive income to retained earnings. Therefore, prior periods have not been restated.

In October 2016, the FASB also issued new guidance which requires an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The new guidance eliminates the exception for an intra-entity transfer of an asset other than inventory. The new guidance is effective for public companies for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The new guidance must be applied on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. The Company adopted the new guidance effective January 1, 2018, recording a cumulative-effect adjustment decrease to retained earnings of approximately $14 million as of the beginning of the period of adoption.

The impact on the Company's balance sheet as of January 1, 2018 related to the adoption of the accounting standards using the modified retrospective approach as discussed above is as follows:

			Adjustments
	Balance at December 31, 2017		Revenue Recognition			Financial Instruments			Intra-Entity Transfer			Balance at January 1, 2018
Balance Sheet
Assets
Net Receivables	$	4,133	$	68		$	—		$	—		$	4,201
Other Current Assets	224		318			—			—			542
Other Assets	1,430		226			—			—			1,656
Deferred Tax Assets	669		(103		)	—			(14		)	552
Liabilities
Accounts Payable and Accrued Liabilities	2,083		122			—			—			2,205
Other Liabilities	1,311		23			—			—			1,334
Equity
Other Accumulated Comprehensive Income	—		—			(14		)	—			(14		)
Retained Earnings	$	13,140	$	364		$	14		$	(14	)	$	13,504

Cumulative effect adjustment related to the adoption of the revenue recognition standard

The cumulative effect adjustment recorded to net receivables is primarily related to contingent brokerage revenue and reinsurance revenue placements. Under the new guidance, the Company is required to record an estimate of variable or contingent consideration earlier than under the previous rules. Also under the new guidance, revenue related to most reinsurance placements is accelerated versus previous patterns.

The cumulative effect adjustments also includes the capitalization of costs to fulfill and costs to obtain that are included in other current assets and other assets, respectively. These costs were previously expensed as incurred. The adjustment to accounts payable and accrued liabilities includes deferred revenue related to the timing of fee revenue recognition for fee based arrangements and certain post placement servicing costs, primarily related to reinsurance brokerage costs that were previously expensed as incurred.

Adoption of amended accounting standard using the retrospective application approach

Effective January 1, 2018, the Company adopted new guidance that changes the presentation of net periodic pension cost and net periodic postretirement cost (''net periodic benefit costs"). The new guidance requires employers to report the service cost component of net periodic benefit costs in the same line item as other compensation costs in the income statement. The other components of net periodic benefit costs are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations. The new guidance requires retrospective application for the presentation of the service cost component and the other components of net periodic benefit costs. Accordingly, we have reclassified prior period information in the consolidated results of operations, segment data and related disclosures contained inour

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management's discussion and analysis and notes to the consolidated financial statements to reflect the retrospective adoption of this standard.

Other accounting standards adopted effective January 1, 2018

In November 2016, the FASB issued new guidance which requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents and amounts generally described as restricted cash or restricted cash equivalents. As a result, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The Company adopted this guidance, which is required to be applied retrospectively to all periods presented, effective January 1, 2018. The adoption of this guidance did not impact the Company's consolidated balance sheets or consolidated statements of cash flows.

In August 2016, the FASB issued new guidance which adds or clarifies guidance on the classification of certain cash receipts and payments in the statement of cash flows, including cash payments for debt prepayments or debt extinguishment costs, contingent consideration payments made after a business combination and distributions received from equity method investees. The Company adopted this guidance effective January 1, 2018. The adoption of this guidance did not impact the Company's consolidated statements of cash flows.

In January 2017, the FASB issued guidance which clarifies the definition of a business in order to assist companies with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The Company adopted this guidance effective January 1, 2018. The adoption of this standard did not have an impact on the Company's financial position or results of operations.

New Accounting Pronouncements Not Yet Adopted

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 guidance is effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company does not expect the adoption of this standard to have a material impact on its financial position or results of operations.

In February 2016, the FASB issued new guidance intended to improve financial reporting for leases. Under the new guidance, a lessee will be required to recognize assets and liabilities for leases with lease terms of more than 12 months. Consistent with current GAAP, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a financing or operating lease. However, unlike current GAAP, which requires that only capital leases be recognized on the balance sheet, the new guidance requires that both types of leases be recognized on the balance sheet. The new guidance will require additional disclosures to help investors and other financial statement users better understand the amount, timing, and uncertainty of cash flows arising from leases. These disclosures include qualitative and quantitative requirements, and additional information about the amounts recorded in the financial statements. The accounting by organizations that own the assets ("lessor") leased by the lessee will remain largely unchanged from current GAAP. However, the guidance contains targeted improvements that are intended to align, where necessary, lessor accounting with the lessee accounting model. The new guidance on leases is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early application is permitted. The Company is currently evaluating the impact the adoption of the guidance will have on its financial position and results of operations, but expects material "right of use" assets and lease liabilities to be recorded on its consolidated balance sheets.

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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") is a global professional services firm offering clients advice and solutions in risk, strategy and people. Its businesses include: Marsh, the insurance broker, intermediary and risk advisor; Guy Carpenter, the risk and reinsurance specialist; Mercer, the provider of HR and Investment related financial advice and services; and Oliver Wyman Group, the management, economic and brand consultancy. With nearly 65,000 colleagues worldwide and annual revenue of more than $14 billion, the Company provides analysis, advice and transactional capabilities to clients in more than 130 countries.

The Company operates 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 wealth, health 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 16 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.

Consolidated Results of Operations

	Three Months Ended June 30,				Six Months Ended June 30,
(In millions, except per share figures)	2018		2017		2018		2017
Revenue	$	3,734	$	3,495	$	7,734	$	6,998
Expense:
Compensation and Benefits	2,135		1,998		4,359		4,003
Other Operating Expenses	908		796		1,776		1,545
Operating Expenses	3,043		2,794		6,135		5,548
Operating Income	691		701		1,599		1,450
Income from Continuing Operations	536		507		1,232		1,085
Net Income Attributable to the Company	$	531	$	501	$	1,221	$	1,070
Net Income Per Share Attributable to the Company:
Basic	$	1.05	$	0.98	$	2.41	$	2.08
Diluted	$	1.04	$	0.96	$	2.38	$	2.05
Average Number of Shares Outstanding:
Basic	507		514		507		514
Diluted	512		520		513		521
Shares outstanding at June 30,	505		513		505		513

As discussed in Note 3 to the consolidated financial statements included in Item I, Part I, effective January 1, 2018, the Company adopted new accounting guidance related to revenue recognition. The new guidance was adopted using the modified retrospective method, which applies the guidance beginning with the year of adoption, with the cumulative effect of initially applying the guidance recognized as an adjustment to retained earnings at January 1, 2018. The comparative information has not been restated and continues to be reported under the prior accounting standards that were in effect for those periods.

As a result of applying the new revenue standard on January 1, 2018, the Company recognized significant changes in the quarterly timing of revenue recognized in the Risk and Insurance Service segment. In particular, under the new standard the recognition of revenue in the Company’s reinsurance broking operations was accelerated from historical patterns, resulting in a significant increase in revenue in the first quarter of 2018 compared to the same period in 2017. Prior to the adoption of this standard, revenue related to most reinsurance placements was recognized on the later of billing or effective date. Typically, this resulted in revenue being recognized over a 12 to

39

18 month period. Under the new guidance, estimated revenue from these treaties will be recognized largely at the policy effective date.

In the insurance brokerage operations, revenue from commission based arrangements will continue to be recorded at the policy effective date, while the timing of revenue recognition for certain fee based arrangements will shift among quarters. However, since the vast majority of our fee arrangements involve contracts that cover a single year of services, the Company does not expect there will be a significant change in the amount of revenue recognized in an annual period.

In the Risk and Insurance Services segment, certain pre-placement costs will be deferred and amortized into earnings when the revenue from the placement is recognized. These costs were previously expensed as incurred. As such, the Company expects the recognition of costs to shift among quarters.

In the Consulting segment, the adoption of the new revenue standard will not have a significant impact on the timing of revenue recognition in quarterly or annual periods.

The Company's consolidated operating income of $691 million in the second quarter of 2018 decreased 1% compared to the prior year period. This reflects increases of 2% related to the impact of applying the new revenue recognition standard, 1% related to the impact of foreign currency translation and 1% from the impact of acquisitions. These increases are more than offset by a decrease in underlying operating earnings of 5%, resulting from an increase in restructuring and related costs discussed in more detail below under "Risk and Insurance Services".

Diluted net income per share attributable to the Company increased 8% when compared to prior year period, reflecting the items discussed above, the impact of a lower effective tax rate in 2018 compared to 2017 due to U.S. tax reform, higher investment income, due to the change in accounting, as well as a 2% decrease in the average number of diluted shares outstanding. The number of shares issued related to the vesting of share awards and exercise of employee stock options was more than offset by shares repurchased over the past four quarters.

The Company's consolidated operating income of $1.6 billion in the first six months of 2018 increased 10% compared to the prior year period. This reflects increases of 8% related to the impact of applying the new revenue recognition standard, 2% related to the impact of foreign currency translation and 1% from the impact of acquisitions. These increases are partly offset by a decrease in underlying operating earnings of 1%, resulting from an increase in restructuring and related costs, discussed in more detail below under "Risk and Insurance Services".

Diluted net income per share attributable to the Company increased 16% when compared to prior year period, reflecting the items discussed above, the impact of a lower effective tax rate in 2018 compared to 2017 due to U.S. tax reform, higher investment income as well as a 2% decrease in the average number of diluted shares outstanding. The number of shares issued related to the vesting of share awards and exercise of employee stock options was more than offset by shares repurchased over the past four quarters.

See Note 17 to the consolidated financial statements for the reconciliation of the impact of applying new revenue guidance on the consolidated statement of income for the quarter ended June 30, 2018.

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Consolidated Revenue and Expense

Revenue - Components of Change

The Company conducts business in more than 130 countries. As a result, foreign exchange rate movements may impact period-to-period comparisons of revenue. Similarly, certain other items such as the revenue impact of acquisitions and dispositions, including transfers among businesses, may impact period-to-period comparisons of revenue. In addition, as described in Note 17 to the consolidated financial statements, the Company adopted new accounting guidance related to revenue recognition, which had a significant impact on the timing of revenue recognition. Underlying revenue measures the change in revenue from one period to another by isolating these impacts. The impact of foreign currency exchange fluctuations, acquisitions and dispositions, including transfers among businesses, and the adoption of the new revenue recognition guidance on the Company’s operating revenues by segment was as follows:

	Three Months Ended June 30,						% Change GAAP Revenue		Components of Revenue Change*
									Currency Impact		Acquisitions/ Dispositions/ Other Impact		Revenue Standard Impact		Underlying Revenue
(In millions)	2018			2017
Risk and Insurance Services
Marsh	$	1,749		$	1,614		8	%	2	%	1	%	—		5	%
Guy Carpenter	332			293			13	%	1	%	—		7	%	5	%
Subtotal	2,081			1,907			9	%	2	%	1	%	1	%	5	%
Fiduciary Interest Income	15			9
Total Risk and Insurance Services	2,096			1,916			9	%	2	%	1	%	1	%	5	%
Consulting
Mercer	1,158			1,109			5	%	2	%	1	%	—		2	%
Oliver Wyman Group	492			483			2	%	3	%	—		—		(2	)%
Total Consulting	1,650			1,592			4	%	2	%	1	%	—		1	%
Corporate / Eliminations	(12		)	(13		)
Total Revenue	$	3,734		$	3,495		7	%	2	%	1	%	1	%	3	%

	Three Months Ended June 30,				% Change GAAP Revenue		Components of Revenue Change*
							Currency Impact		Acquisitions/ Dispositions/ Other Impact		Revenue Standard Impact		Underlying Revenue
(In millions)	2018		2017
Marsh:
EMEA	$	526	$	497	6	%	5	%	—		—		1	%
Asia Pacific	183		168		9	%	2	%	—		—		6	%
Latin America	99		99		—		(5	)%	3	%	—		3	%
Total International	808		764		6	%	3	%	1	%	—		2	%
U.S. / Canada	941		850		11	%	—		2	%	1	%	8	%
Total Marsh	$	1,749	$	1,614	8	%	2	%	1	%	—		5	%
Mercer:
Defined Benefit Consulting & Administration	$	320	$	340	(6	)%	3	%	(3	)%	—		(6	)%
Investment Management & Related Services	232		192		20	%	2	%	6	%	—		12	%
Total Wealth	552		532		4	%	3	%	—		—		1	%
Health	429		423		2	%	1	%	—		(1	)%	1	%
Career	177		154		15	%	2	%	6	%	—		7	%
Total Mercer	$	1,158	$	1,109	5	%	2	%	1	%	—		2	%

Underlying revenue measures the change in revenue using consistent currency exchange rates, excluding the impact of certain items that affect comparability such as: acquisitions, dispositions, transfers among businesses, changes in estimate methodology and the impact of the new revenue standard.
*	Components of revenue change may not add due to rounding.

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	Six Months Ended June 30,						% Change GAAP Revenue		Components of Revenue Change*
									Currency Impact		Acquisitions/ Dispositions/ Other Impact		Revenue Standard Impact		Underlying Revenue
(In millions)	2018			2017
Risk and Insurance Services
Marsh	$	3,443		$	3,210		7	%	3	%	2	%	(1	)%	3	%
Guy Carpenter	969			678			43	%	2	%	—		35	%	6	%
Subtotal	4,412			3,888			13	%	3	%	2	%	5	%	4	%
Fiduciary Interest Income	28			17
Total Risk and Insurance Services	4,440			3,905			14	%	3	%	2	%	5	%	4	%
Consulting
Mercer	2,329			2,186			7	%	3	%	1	%	—		3	%
Oliver Wyman Group	989			932			6	%	4	%	—		—		2	%
Total Consulting	3,318			3,118			6	%	3	%	1	%	—		3	%
Corporate / Eliminations	(24		)	(25		)
Total Revenue	$	7,734		$	6,998		11	%	3	%	1	%	3	%	4	%

	Six Months Ended June 30,				% Change GAAP Revenue		Components of Revenue Change*
							Currency Impact		Acquisitions/ Dispositions/ Other Impact		Revenue Standard Impact		Underlying Revenue
(In millions)	2018		2017
Marsh:
EMEA	$	1,169	$	1,086	8	%	8	%	—		—		(1	)%
Asia Pacific	347		320		8	%	3	%	—		—		5	%
Latin America	183		179		2	%	(4	)%	2	%	—		4	%
Total International	1,699		1,585		7	%	6	%	—		—		1	%
U.S. / Canada	1,744		1,625		7	%	—		4	%	(2	)%	6	%
Total Marsh	$	3,443	$	3,210	7	%	3	%	2	%	(1	)%	3	%
Mercer:
Defined Benefit Consulting & Administration	$	659	$	674	(2	)%	5	%	(2	)%	—		(5	)%
Investment Management & Related Services	458		378		21	%	4	%	4	%	—		14	%
Total Wealth	1,117		1,052		6	%	4	%	—		—		2	%
Health	871		838		4	%	2	%	(1	)%	(1	)%	4	%
Career	341		296		15	%	3	%	6	%	—		6	%
Total Mercer	$	2,329	$	2,186	7	%	3	%	1	%	—		3	%

Underlying revenue measures the change in revenue using consistent currency exchange rates, excluding the impact of certain items that affect comparability such as: acquisitions, dispositions, transfers among businesses, changes in estimate methodology and the impact of the new revenue standard.
*	Components of revenue change may not add due to rounding.

Revenue

Consolidated revenue for the second quarter of 2018 was $3.7 billion, an increase of 7%, or 3% on an underlying basis, with increases of 1% related to applying the new revenue recognition standard, 1% from the impact of acquisitions and 2% from the impact of foreign currency translation.

Revenue in the Risk and Insurance Services segment for the second quarter of 2018 was $2.1 billion, an increase of 9% from the same quarter of the prior year and 5% on an underlying basis. The revenue increase also reflects increases of 1% from applying the new revenue recognition standard, 2% from the impact of foreign currency translation and 1% from acquisitions. Consulting revenue of $1.7 billion in the second quarter of 2018 increased 4%, or 1% on an underlying basis. The application of the new revenue recognition standard had a negligible impact

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on Consulting revenue in the quarter, while the impact of foreign currency translation increased revenue by 2% and acquisitions increased revenue by 1% in the second quarter of 2018 as compared to the same period last year.

For the first six months of 2018, consolidated revenue increased 11% or 4% on an underlying basis. The revenue increase reflects increases of 3% from applying the new revenue recognition standard, 3% from the impact of foreign currency translation and 1% from acquisitions. Risk and Insurance Services revenue increased 14% from the same period in 2017, or 4% on an underlying basis. The revenue increase reflects increases of 5% from applying the new revenue recognition standard, 3% from the impact of foreign currency translation and 2% from acquisitions. Consulting revenue increased 6% compared with the six-month period last year, or 3% on an underlying basis. The application of the new revenue recognition standard had a negligible impact on Consulting revenue in the first six months of the year, while the impact of foreign currency translation increased revenue by 3% and acquisitions increased revenue by 1% in 2018 as compared to the same period last year.

Operating Expense

Consolidated operating expense in the second quarter increased 9% compared with the same period last year, reflecting increases of 5% on an underlying basis, 2% from the impact of foreign currency translation, and 1% from acquisitions. The increase in underlying expenses is primarily due to higher base salaries, asset based fees, recoverable expenses and outside service costs as well as the impact of severance and consulting costs related to the Marsh simplification initiative discussed below under "Risk and Insurance Services Expense".

Expenses for the six months of 2018 increased 11% compared to the same period in 2017, reflecting a 5% increase

on an underlying basis, a 1% increase from acquisitions, a 3% increase from the impact of foreign

currency translation and an increase of 1% due to the application of the new revenue standard. The increase in underlying expenses is due primarily to the items discussed in the previous paragraph.

Risk and Insurance Services

The results of operations for the Risk and Insurance Services segment are presented below:

For the Three and Six Months Ended June 30,	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Revenue	$	2,096		$	1,916		$	4,440		$	3,905
Compensation and Benefits	1,145			1,014			2,313			2,039
Other Operating Expenses	479			420			939			816
Expense	1,624			1,434			3,252			2,855
Operating Income	$	472		$	482		$	1,188		$	1,050
Operating Income Margin	22.5		%	25.2		%	26.8		%	26.9		%

Revenue

Revenue in the Risk and Insurance Services segment in the second quarter of 2018 was $2.1 billion, an increase of 9% as compared to the same period last year, reflecting a 5% increase in underlying revenue, a 1% increase related to the impact of the new revenue recognition standard, a 1% increase related to acquisitions and a 2% increase related to the impact of foreign currency translation.

In Marsh, revenue in the second quarter of 2018 was $1.7 billion, an increase of 8% compared with the same quarter of the prior year, reflecting an increase in underlying revenue of 5%, a 1% increase from acquisitions and a 2% increase related to the impact of foreign currency translation. In U.S./Canada, underlying revenue increased 8% compared to prior year. Revenue in International operations grew 2% on an underlying basis, with growth of 6% in Asia Pacific, 3% in Latin America and 1% in EMEA. Guy Carpenter's second quarter revenue increased 13%, or 5% on an underlying basis, reflecting a 7% increase related to the impact of the new revenue recognition standard and a 1% increase related to the impact of foreign currency translation.

Revenue in the Risk and Insurance Services segment increased 14% in the first six months of 2018 compared with

2017, or 4% on an underlying basis. In Marsh, underlying revenue increased 6% in U.S./Canada. The international

division increased 1% on an underlying basis, reflecting a 5% increase in Asia Pacific and a 4% increase in Latin America partly offset by a 1% decrease in EMEA. Guy Carpenter's revenue in the first six months of 2018 increased 43%, reflecting a 6% increase on an underlying basis, a 35% increase related to the impact of the new revenue recognition standard and a 2% increase related to the impact of foreign currency translation.

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Expense

Expenses in the Risk and Insurance Services segment increased 13% in the second quarter of 2018 compared with the same period last year, reflecting increases of 9% in underlying expenses, 1% related to acquisitions, 2% from the impact of foreign currency translation and 1% related to the impact of the new revenue recognition standard.

During the second quarter of 2018, Marsh initiated a program to simplify the organization through reduced management layers and more common structures across regions and businesses to more closely align with its more formalized segmentation strategy across large risk management, middle market corporate, and small commercial & personal segments. These efforts are expected to create increased efficiencies and additional capacity for reinvestment in people and technology. During the quarter ended June 30, 2018, the Company incurred restructuring severance and consulting costs of $55 million related to this initiative. The Company expects to incur additional costs of approximately $25 million to $45 million related to this initiative.

During the quarter, restructuring and related charges increased underlying expenses by approximately 4%. The remaining increase in underlying expense was primarily due to higher base salaries and outside service costs.

Expenses for the six month period of 2018 increased 14% compared to the prior year, reflecting increases of 6% in underlying expenses, 2% related to acquisitions, 3% from the impact of foreign currency translation and 3% related to the impact of the new revenue recognition standard. The underlying expense increase is primarily due to the items discussed in the previous paragraph.

Consulting

The results of operations for the Consulting segment are presented below:

For the Three and Six Months Ended June 30,	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Revenue	$	1,650		$	1,592		$	3,318		$	3,118
Compensation and Benefits	902			901			1,858			1,792
Other Operating Expenses	481			426			946			836
Expense	1,383			1,327			2,804			2,628
Operating Income	$	267		$	265		$	514		$	490
Operating Income Margin	16.2		%	16.6		%	15.5		%	15.7		%

Revenue

Revenue in the Consulting segment in the second quarter of 2018 was $1.7 billion, an increase of 4% compared to the same period last year, reflecting a 1% increase in underlying revenue and a 2% increase from the impact of foreign currency translation. The new revenue recognition standard had a negligible impact on Consulting revenue in the second quarter of 2018.

Mercer's revenue of approximately $1.2 billion increased 5% compared to the prior year, reflecting a 2% increase on an underlying basis, and a 2% increase from the impact of foreign currency translation. On an underlying basis, revenue in Health increased 1%, Career increased 7%, and Wealth increased 1%. Within Wealth, Investment Management & Related Services increased 12% and Defined Benefit Consulting & Administration decreased 6% compared to the same period last year. Oliver Wyman's revenue increased 2% to $492 million in the second quarter of 2018 compared to the same period last year, reflecting a 3% increase from the impact of foreign currency translation partly offset by a 2% decrease on an underlying basis. The new revenue recognition standard did not have an impact on Oliver Wyman's revenue in the quarter.

Consulting revenue in the first six months of 2018 increased 6%. Underlying revenue increased 3% with underlying

growth of 3% at Mercer and 2% at Oliver Wyman.

Expense

Consulting expenses in the second quarter of 2018 increased 4% as compared to the second quarter of 2017. This reflects an underlying expense increase of 1%, a 1% increase from acquisitions and a 2% increase from the impact of foreign currency translation. The increase in underlying expenses is primarily due to higher base salaries, asset-based fees and outside service costs partly offset by lower incentive compensation costs. These increases were mostly offset by restructuring charges that were incurred in 2017.

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Underlying expenses for the six months of 2018 increased 3% as compared to 2017, primarily due to items discussed above.

Corporate and Other

Corporate expenses were $48 million and $46 million for the second quarter of 2018 and 2017, respectively. The increase is primarily due to higher severance and incentive compensation. For the first six months of 2018 Corporate expenses were $103 million compared with $90 million for the same period last year. The increase in expenses is primarily due to one-time bonus payments related to U.S. tax reform and higher incentive compensation.

Interest

Interest income earned on corporate funds was $3 million in the second quarter of 2018 compared with $2 million for the same period in 2017, and $6 million for the six month period of 2018 compared with $4 million for the same period in 2017. Interest income increased primarily due to the impact of higher interest rates. Interest expense increased $8 million in the second quarter of 2018 compared with the second quarter of 2017 and increased $11 million for the six months of 2018 compared with the same period last year primarily due to higher average debt outstanding in 2018.

Investment Income

The caption "Investment income" 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 debt securities, mark-to-market increases/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.

As discussed in Note 17 to the consolidated financial statements, effective January 1, 2018, the Company prospectively adopted a new accounting standard, that requires equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. The Company holds certain equity investments that under legacy GAAP were previously treated as available for sale securities, whereby the mark-to-market change was recorded to other comprehensive income in its consolidated balance sheet. The Company recorded a cumulative-effect adjustment increase to retained earnings as of the beginning of the period of adoption of $14 million, reflecting the reclassification of cumulative unrealized gains, net of tax, as of December 31, 2017 from other comprehensive income to retained earnings. Therefore, prior periods have not been restated.

The Company recorded net investment gains of $28 million for both the three and six month periods ended June 30, 2018 and gains of $5 million for both the three and six month periods ended Jun 30, 2017. The three months ended June 30, 2018 includes gains of $26 million related to mark-to-market changes in securities with readily determinable market values and gains of $2 million related to investments in private equity funds. The six months ended June 30, 2018 includes gains of $19 million related to mark-to-market changes in securities with readily determinable market values and gains of $9 million related to investments in private equity funds. The prior period gains are related to the Company's investments in private equity funds.

Income Taxes

On December 22, 2017, the U.S. tax legislation commonly known as the "Tax Cuts and Jobs Act" (the "TCJA") significantly changed the U.S. Internal Revenue Code of 1986, as amended. The TCJA generally became effective on January 1, 2018. The TCJA provided for a reduction in the U.S. corporate tax rate to 21% and the creation of a broadly territorial tax system. The TCJA also changed the deductibility of certain expenses, primarily executive officers’ compensation. In the fourth quarter of 2017, the Company recorded a provisional charge of $460 million related to the enactment of the TCJA. As discussed in Note 2 to the consolidated financial statements, this provisional charge may be adjusted in 2018. The TCJA provided for a transition to the territorial system via a transition tax on undistributed earnings of non-U.S. subsidiaries. The Company recorded a provisional charge of $240 million in the fourth quarter of 2017 as an estimate of U.S. transition taxes and ancillary effects, including state taxes and foreign withholding taxes related to the change in permanent reinvestment status with respect to our pre-2018 foreign earnings. This transition tax is payable over eight years. The reduction of the U.S. corporate tax rate from 35% to 21% reduced the value of the U.S. deferred tax assets and liabilities. Accordingly, a charge of $220 million was recorded. Adjustments during the first half of 2018 to provisional estimates of transition taxes and U.S. deferred tax assets and liabilities increased income tax expense by $3 million. These estimates may be further adjusted during 2018 after the Company has finalized its analysis of all the relevant information.

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The Company's effective tax rate in the second quarter of 2018 was 25.6% compared with 28.6% in the second quarter of 2017. The effective tax rates for the first six months of 2018 and 2017 were 24.7% and 25.9%. The rate in the first half of 2018 reflects ongoing impacts of the Tax Cuts and Jobs Act (the "TCJA"), primarily the reduced 21% U.S. statutory rate and certain tax planning benefits, largely offset by higher estimated costs from the new territorial system, greater disallowance of compensation and entertainment deductions and a decrease in excess tax benefits related to share-based compensation. The rates in 2017 reflect foreign operations taxed at rates below the 35% U.S. statutory tax rate, including the effect of repatriation. The tax rates in both periods reflect the impact of discrete tax matters, tax legislation and nontaxable adjustments to contingent acquisition consideration.

The effective tax rate is sensitive to the geographic mix and repatriation of the Company's earnings, which may result in higher or lower tax rates. Combined U.S. federal and state corporate tax rates exceed tax rates applicable in many jurisdictions outside the U.S. A significant portion of the Company's profits are earned outside the U.S. In 2018, the forecasted pre-tax income in the U.K., Barbados, Canada, Australia and Ireland is expected to account for approximately 60% of the Company's total non-U.S. pre-tax income, with estimated effective tax rates in those countries of 23%, 0.4%, 27%, 30% and 12%, respectively.

Losses in one jurisdiction cannot generally 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 increased from $71 million at December 31, 2017 to $72 million at June 30, 2018 due to current accruals partially offset by settlements of audits and expirations of statutes of limitation. We expect that the total amount of unrecognized tax benefits may decrease between zero and approximately $8 million within the next twelve months due to settlements of audits and expirations of statutes of limitation.

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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 also provides 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 below 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 June 30, 2018, the Company had approximately $934 million of cash and cash equivalents in its foreign operations, which includes $172 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 foreign funds from its non-U.S. operating subsidiaries out of current annual earnings, and with respect to repatriating 2017 and prior earnings, it is in the process of fully evaluating 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 as it considers its permanent reinvestment assertions going forward in light of the enactment at the end of 2017 of the TCJA.

In the first six months of 2018, the Company recorded foreign currency translation adjustments which decreased net equity by approximately $293 million. Continued strenghtening of the U.S. dollar against foreign currencies would further reduce 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 and cash equivalents 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 $413 million of cash from operations for the six month period ended June 30, 2018, compared to $343 million generated by operations in the first six months of 2017. 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.

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 six months of 2018, the Company contributed $41 million to its non-U.S. defined benefit pension plans and $14 million to its U.S. defined benefit pension plans. In the first six months of 2017, the Company contributed $105 million to its non-U.S. defined benefit pension plans and $15 million to its U.S. defined benefit pension plans.

In the U.S., contributions to the tax-qualified defined benefit plans are based on ERISA guidelines and the Company generally expects to maintain a funded status of 80% or more of the liability determined under the ERISA guidelines.

Outside the U.S., the Company has a large number of 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, 2017. 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 the actuarial valuation of the plans. Currently, this results in a lower funded status than under U.S. GAAP and may result in contributions irrespective of the U.S. GAAP funded status. In November 2016, the Company and the Trustee of the U.K. defined benefits plans agreed to a funding deficit recovery plan for the U.K. defined benefit pension plans. The current agreement with the Trustee sets out the annual deficit contributions which would be due based on the deficit at December 31, 2015. The funding level is subject to re-assessment, in most cases on November 1 of each year. If the funding level on November 1 is sufficient, no deficit funding contributions will be required in the following year, and the contribution amount will be deferred. The funding

47

level was re-assessed on November 1, 2017 and no deficit funding contributions are required in 2018. The funding level will be re-assessed on November 1, 2018. As part of a long-term strategy, which depends on having greater influence over asset allocation and overall investment decisions, in November 2016 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 expects to fund an additional $41 million to its non-U.S. defined benefit plans over the remainder of 2018, comprising approximately $35 million to plans outside of the U.K. and $6 million to the U.K. plans. The Company also expects to fund an additional $13 million to its U.S. defined benefit plans during the remainder of 2018.

Funding amounts may be influenced by future asset performance, the level of discount rates and other variables impacting the funded status of the plan.

Changes in Pension Plans

In March 2017, the Company modified its defined benefit pension plans in Canada to discontinue further benefit accruals for participants after December 31, 2017 and replaced them with a defined contribution arrangement. The Company also amended its post-retirement benefits plan in Canada so that individuals who retire after April 1, 2019 will generally not be eligible to participate. The Company re-measured the assets and liabilities of the plans, based on assumptions and market conditions on the amendment date.

Financing Cash Flows

Net cash used by financing activities was $232 million for the six-month period ended June 30, 2018, compared with $16 million of net cash provided by such activities for the same period in 2017.

Debt

The Company has established a short-term debt financing program of up to $1.5 billion through the issuance of commercial paper. The proceeds from the issuance of commercial paper are used for general corporate purposes. The Company had $175 million of commercial paper outstanding at June 30, 2018 at an effective interest rate of 2.25%.

In March 2018, the Company issued $600 million of 4.20% senior notes due 2048. The Company used the net proceeds for general corporate purposes.

In January 2017, the Company issued $500 million of 2.75% senior notes due in 2022 and $500 million of 4.35% senior notes due in 2047. The Company used the net proceeds for general corporate purposes, which included the repayment of $250 million of senior notes in April 2017.

Credit Facilities

The Company and certain of its subsidiaries maintain a $1.5 billion multi-currency five-year unsecured revolving credit facility. The interest rate on this facility is based on LIBOR plus a fixed margin which varies with the Company's credit ratings. This facility expires in November 2020 and requires the Company to maintain certain coverage and leverage ratios which are tested quarterly. There were no borrowings outstanding under this facility at June 30, 2018.

The Company's senior debt is currently rated A- by Standard & Poor's and Baa1 by Moody's. The Company's short-term debt is currently rated P-2 by Moody's and A-2 by Standard & Poor's. The Company carries a stable outlook from Moody's and Standard & Poor's.

Share Repurchases

During the first six months of 2018, the Company repurchased 6.1 million shares of its common stock for total consideration of $500 million at an average price per share of $82.08. In November 2016, 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 going forward. As of June 30, 2018, the Company remained authorized to purchase shares of its common stock up to a value of approximately $1.0 billion. There is no time limit on this authorization.

During the first six months of 2017, the Company repurchased approximately 5.4 million shares of its common stock for consideration of $400 million.

Contingent payments related to acquisitions

During the first six months of 2018, the Company paid $41 million of contingent payments related to acquisitions made in prior periods. These payments are split between financing and operating cash flows in the consolidated

48

statements of cash flows. Payments of $32 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 $9 million are reflected as operating cash flows. Remaining estimated future contingent consideration payments of $185 million for acquisitions completed in the first six months of 2018 and in prior years are recorded in accounts payable and accrued liabilities or other liabilities in the consolidated balance sheet at June 30, 2018.

The Company paid deferred purchase consideration related to prior years' acquisitions of $53 million in the first six months of 2018. Remaining deferred cash payments of approximately $74 million for acquisitions completed in the first six months of 2018 and in prior years are recorded in accounts payable and accrued liabilities or other liabilities in the consolidated balance sheet at June 30, 2018.

In the first six months of 2017, the Company paid $65 million of contingent payments related to acquisitions made in prior periods. Of this amount, $60 million was reported as financing cash flows and $5 million as operating cash flows.

Dividends

The Company paid dividends on its common shares of $383 million ($0.75 per share) during the first six months of 2018, as compared with $351 million ($0.68 per share) during the first six months of 2017.

Investing Cash Flows

Net cash used for investing activities amounted to $279 million in the first six months of 2018, compared with $538million used during the same period in 2017.

The Company paid $144 million and $412 million, net of cash acquired, for acquisitions it made during the first six months of 2018 and 2017, respectively.

The Company used cash of $135 million to purchase fixed assets and capitalized software in the first six months of 2018, compared with $144 million in the first six months of 2017, primarily related to computer equipment and software purchases, software development costs and the refurbishing and modernizing of office facilities.

The Company has commitments for potential future investments of approximately $48 million in four private equity funds that invest primarily in financial services companies.

Commitments and Obligations

The Company’s contractual obligations of the types identified in the table below were of the following amounts as of June 30, 2018:

(In millions of dollars)	Payment due by Period
Contractual Obligations	Total		Within 1 Year		1-3 Years		4-5 Years		After 5 Years
Commercial paper	$	175	$	175	$	—	$	—	$	—
Short-term debt	264		264		—		—		—
Long-term debt	5,854		—		831		1,381		3,642
Interest on long-term debt	2,588		227		424		356		1,581
Net operating leases	1,900		298		512		421		669
Service agreements	274		167		85		11		11
Other long-term obligations	278		123		143		12		—
Total	$	11,333	$	1,254	$	1,995	$	2,181	$	5,903

The above does not include unrecognized tax benefits of $72 million as the Company is unable to reasonably predict the timing of settlement of these liabilities, other than approximately $5 million that may become payable within one year. The above does not include net pension liabilities of approximately $1.7 billion because the timing and amount of ultimate payment of such liability is dependent upon future events, including, but not limited to, future returns on plan assets and changes in the discount rate used to measure the liabilities.

The above does not include the provisional estimate of transitional tax payments related to the TCJA of $240million. The amounts of estimated future benefits payments to be made from pension plan assets are disclosed in Note 7 to the consolidated financial statements. The Company expects to contribute approximately $13 million and $41 million to its U.S. and non-U.S. pension plans, respectively, for the remainder of 2018.

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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 2017 Form 10-K. The adoption of the new revenue guidance on January 1, 2018 has increased the significance of judgments and estimates management must make to apply the guidance. In particular, in the Risk and Insurance Services segment, judgments related to the amount of variable revenue consideration to ultimately be received on placement of quota share reinsurance treaties and contingent commission from insurers, which was previously recognized when the contingency was resolved, now requires significant judgments and estimates. Management also makes significant judgments and estimates to measure the progress toward completing performance obligations and realization rates for consideration related to contracts as well as potential performance-based fees in the Consulting segment. See Note 3 to the consolidated financial statements for additional information.

New Accounting Guidance

Note 17 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.

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

(In millions)	June 30, 2018
Cash and cash equivalents invested in money market funds, certificates of deposit and time deposits	$	1,036
Fiduciary cash and investments	$	5,118

Based on the above balances, if short-term interest rates increased or decreased by 10%, or 14 basis points, for the remainder of the year, annual interest income, including interest earned on fiduciary funds, would increase or decrease by approximately $3 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 2018 are discussed in Note 7 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 and cash equivalents and fiduciary fund investments are subject to potential loss of value due to counter-party credit risk. To minimize this risk, the Company and its subsidiaries invest 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 in response to market conditions. The majority of cash and fiduciary fund investments are invested in short-term bank deposits.

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 events, such as the decision in the United Kingdom to exit the European Union. Similar macroeconomic events may result in greater foreign exchange rate fluctuations in the future. The Company estimates that a 10% movement of major foreign currencies (Euro, Sterling, Australian dollar and Canadian dollar) in the same direction against the U.S. dollar that held constant over the course of the year would increase or decrease full year net operating income by approximately $57 million. The Company has exposure to approximately 80 foreign currencies overall. If exchange rates at June 30, 2018 hold constant for the rest of 2018, the Company estimates the year-over-year impact from conversion of foreign currency earnings will increase full year net operating income by approximately $21 million.

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

Equity Price Risk

As discussed in Note 17 to the consolidated financial statements, effective January 1, 2018, the Company adopted a new accounting standard that requires equity investments with readily determinable market values to be measured at fair value with changes in fair value recognized in net income.

51

The Company holds investments in both public and private companies as well as private equity funds, including investments of approximately $113 million that are valued using readily determinable fair values and approximately $64 million of investments without readily determinable fair values. The Company also has investments of approximately $391 million that are accounted for using the equity method, including the Company's investment in Alexander Forbes. 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.

As of June 30, 2018 the carrying value of the Company's investment in Alexander Forbes was $246 million. As of June 30, 2018, the market value of the approximately 443 million shares of Alexander Forbes owned by the Company, based on the June 30, 2018 closing share price of 5.77 South African Rand per share, was approximately $188 million. The Company considered several factors in assessing its investment in Alexander Forbes, including its financial position, the near- and long-term prospects of Alexander Forbes and the broader South African economy and capital markets, the length of time and extent to which the market value was below cost and the Company’s intent and ability to retain the investment for a sufficient period of time to allow for anticipated recovery in market value. During the first six months of 2018, the Alexander Forbes average opening and closing stock price was approximately 6.66 Rand (approximately 89% of the original purchase price) and ranged from a low of 5.00 Rand (in mid June) to a high of 7.34 Rand (in late March) (approximately 67% to 98% of the purchase price) and traded within 10% of its purchase price as recently as early-June. The trading price declined further during July, 2018. Based on its assessment of the factors discussed above, in particular the relatively short period during which the shares traded significantly below their purchase price, and the Company’s intention to continue to hold the shares for a period of time sufficient to allow for recovery, the Company determined the investment was not impaired. However, if the share price does not recover in future periods, an impairment charge for an "other than temporary" decline in value of its investment could be incurred.

Other

A number of lawsuits and regulatory proceedings are pending. See Note 15 ("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 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.

52

PART II. OTHER INFORMATION

Item 1.        Legal Proceedings.

In April 2017, the Financial Conduct Authority in the United Kingdom (the "FCA") commenced a civil competition investigation into the aviation insurance and reinsurance sector. In connection with that investigation, the FCA carried out an on-site inspection at the London office of Marsh Limited, our Marsh and Guy Carpenter operating subsidiary in the United Kingdom. The FCA indicated that it had reasonable grounds for suspecting that Marsh Limited and other participants in the market have been sharing competitively sensitive information within the aviation insurance and reinsurance broking sector.

In October 2017, the Company received a notice that the Directorate-General for Competition of the European Commission had commenced a civil investigation of a number of insurance brokers, including Marsh, regarding "the exchange of commercially sensitive information between competitors in relation to aviation and aerospace insurance and reinsurance broking products and services in the European Economic Area ("EEA"), as well as possible coordination between competitors." In light of the action taken by the European Commission, the FCA informed Marsh Limited at the same time that it has discontinued its investigation under U.K. competition law. In May 2018, the FCA advised that it would not be taking any further action with Marsh Limited in connection with this matter.

In July 2017, the Directorate-General for Competition of the European Commission together with the Irish Competition and Consumer Protection Commission conducted on-site inspections at the offices of Marsh and other industry participants in Dublin in connection with an investigation regarding the "possible participation in anticompetitive agreements and/or concerted practices contrary to [E.U. competition law] in the market for commercial motor insurance in the Republic of Ireland."

We are cooperating with these investigations and are conducting our own reviews. At this time, we are unable to predict their likely timing, outcome or ultimate impact. There can be no assurance that the ultimate resolution of these or any related matters will not have a material adverse effect on our consolidated results of operations, financial condition or cash flows.

We and our 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 is set forth in Note 15 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, 2017. 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.

53

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

Issuer Repurchases of Equity Securities

The Company repurchased approximately 3.1 million shares of its common stock for $250 million during the second quarter of 2018. In November 2016, 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. As of June 30, 2018, the Company remained authorized to repurchase up to approximately $1.0 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
April 1-30, 2018	916,161	$	82.0518	916,161	$	1,215,580,211
May 1-31, 2018	1,395,011	$	80.9624	1,395,011	$	1,102,636,719
June 1-30, 2018	758,098	$	81.6303	758,098	$	1,040,752,944
Total	3,069,270	$	81.4526	3,069,270	$	1,040,752,944

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.

54

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:	July 27, 2018	/s/ Mark C. McGivney
		Mark C. McGivney
		Chief Financial Officer
Date:	July 27, 2018	/s/ Stacy M. Mills
		Stacy M. Mills
		Vice President & Controller
		(Chief Accounting Officer)

55

EXHIBIT INDEX

Exhibit No.	Exhibit Name
10.1	Description of Compensation Arrangements for Independent Directors of Marsh & McLennan Companies, Inc. effective June 1, 2018
12.1	Statement Re: Computation of Ratio of Earnings to Fixed Charges
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
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

56

EX-10.1

Exhibit 10.1

Description of Compensation Arrangements for Independent Directors

Effective June 1, 2018, which will be the start of the Board’s annual pay cycle, Marsh & McLennan Companies, Inc. (the "Company") will compensate its independent directors as follows:

Basic Annual Retainer. All independent directors will receive a basic annual retainer of $120,000.

Annual Stock Grant. On June 1 of each year, all independent directors will receive an annual grant of the Company’s common stock with a market value of $175,000 on the grant date.

Supplemental Annual Retainers for Audit and Compensation Committee Chairs. The chairs of the Board’s audit and compensation committees will each receive a supplemental annual retainer of $25,000.

Supplemental Annual Retainers for Committee Chairs. The chairs of the Board’s finance, directors and governance and corporate responsibility committees will each receive a supplemental annual retainer of $15,000.

Supplemental Annual Retainer for Non-Executive Chairman. The Board’s independent chairman will receive a supplemental annual retainer of $200,000.

Under the terms of the Company’s Directors’ Stock Compensation Plan, each director may elect to receive his or her basic annual retainer and any supplemental annual retainer in cash, common stock or a combination thereof.

EX-12.1

Exhibit 12.1

Marsh & McLennan Companies, Inc. and Subsidiaries

Ratio of Earnings to Fixed Charges

(In millions, except ratios)

	Six Months Ended June 30, 2018		Years Ended December 31,
	(Unaudited)			2017		2016		2015		2014		2013
Earnings
Income before income taxes	$	1,635		$	2,643	$	2,480	$	2,307	$	2,057	$	1,973
Interest expense	129			237		189		163		165		167
Portion of rents representative of the interest factor	61			118		122		127		131		134
	$	1,825		$	2,998	$	2,791	$	2,597	$	2,353	$	2,274
Fixed Charges
Interest expense	$	129		$	237	$	189	$	163	$	165	$	167
Portion of rents representative of the interest factor	61			118		122		127		131		134
	$	190		$	355	$	311	$	290	$	296	$	301
Ratio of Earnings to Fixed Charges	9.6			8.4		9.0		9.0		7.9		7.6

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:	July 27, 2018	/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:	July 27, 2018	/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 June 30, 2018 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:	July 27, 2018	/s/ Daniel S. Glaser
		Daniel S. Glaser
		President and Chief Executive Officer

Date:	July 27, 2018	/s/ Mark C. McGivney
		Mark C. McGivney
		Chief Financial Officer

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 24, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	MARSH & MCLENNAN COMPANIES, INC.
Entity Central Index Key	0000062709
Trading Symbol	MMC
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		504,979,546

XML

Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenue	$ 3,734	$ 3,495	$ 7,734	$ 6,998
Expense:
Compensation and benefits	2,135	1,998	4,359	4,003
Other operating expenses	908	796	1,776	1,545
Operating expenses	3,043	2,794	6,135	5,548
Operating income	691	701	1,599	1,450
Other net benefit credits	65	63	131	123
Interest income	3	2	6	4
Interest expense	(68)	(60)	(129)	(118)
Investment income	28	5	28	5
Income before income taxes	719	711	1,635	1,464
Income tax expense	183	204	403	379
Net income before non-controlling interests	536	507	1,232	1,085
Less: Net income attributable to non-controlling interests	5	6	11	15
Net income attributable to the Company	$ 531	$ 501	$ 1,221	$ 1,070
Net Income Per Share Attributable to the Company:
Basic net income per share attributable to the Company (usd per share)	$ 1.05	$ 0.98	$ 2.41	$ 2.08
Diluted net income per share attributable to the Company (usd per share)	$ 1.04	$ 0.96	$ 2.38	$ 2.05
Average number of shares outstanding:
Average number of shares outstanding - Basic	507	514	507	514
Average number of shares outstanding - Diluted	512	520	513	521
Shares outstanding at June 30,	505	513	505	513

XML

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income before non-controlling interests	$ 536	$ 507	$ 1,232	$ 1,085
Other comprehensive (loss) income, before tax:
Foreign currency translation adjustments	(529)	290	(301)	525
Unrealized investment gains	0	24	0	19
Gain (loss) related to pension/post-retirement plans	192	(5)	108	28
Other comprehensive (loss) income, before tax	(337)	309	(193)	572
Income tax expense on other comprehensive income	23	13	15	20
Other comprehensive (loss) income, net of tax	(360)	296	(208)	552
Comprehensive income	176	803	1,024	1,637
Less: comprehensive income attributable to non-controlling interest	5	6	11	15
Comprehensive income attributable to the Company	$ 171	$ 797	$ 1,013	$ 1,622

XML

Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,036	$ 1,205
Receivables
Commissions and fees	4,288	3,777
Advanced premiums and claims	62	65
Other	367	401
Gross receivables	4,717	4,243
Less-allowance for doubtful accounts and cancellations	(116)	(110)
Net receivables	4,601	4,133
Other current assets	538	224
Total current assets	6,175	5,562
Goodwill	9,177	9,089
Other intangible assets	1,234	1,274
Fixed assets (net of accumulated depreciation and amortization of $1,857 at June 30, 2018 and $1,826 at December 31, 2017)	698	712
Pension related assets	1,808	1,693
Deferred tax assets	532	669
Other assets	1,535	1,430
Total assets	21,159	20,429
Current liabilities:
Short-term debt	439	262
Accounts payable and accrued liabilities	2,246	2,083
Accrued compensation and employee benefits	1,103	1,718
Accrued income taxes	216	199
Dividends payable	212	0
Total current liabilities	4,216	4,262
Fiduciary liabilities	5,118	4,847
Less – cash and investments held in a fiduciary capacity	(5,118)	(4,847)
Net fiduciary assets	0	0
Long-term debt	5,813	5,225
Pension, post-retirement and post-employment benefits	1,768	1,888
Liabilities for errors and omissions	303	301
Other liabilities	1,262	1,311
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 June 30, 2018 and December 31, 2017	561	561
Additional paid-in capital	732	784
Retained earnings	14,131	13,140
Accumulated other comprehensive loss	(4,265)	(4,043)
Non-controlling interests	81	83
Stockholders' equity before treasury stock	11,240	10,525
Less – treasury shares, at cost, 55,507,129 shares at June 30, 2018 and 51,930,135 shares at December 31, 2017	(3,443)	(3,083)
Total equity	7,797	7,442
Total liabilities and stockholders' equity	$ 21,159	$ 20,429

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Fixed assets, accumulated depreciation and amortization	$ 1,857	$ 1,826
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	55,507,129	51,930,135

XML

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating cash flows:
Net income before non-controlling interests	$ 1,232	$ 1,085
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization of fixed assets and capitalized software	159	156
Amortization of intangible assets	88	80
Adjustments and payments related to contingent consideration liability	2	(13)
Provision for deferred income taxes	34	42
(Gain) loss on investments	(28)	(5)
(Gain) loss on disposition of assets	(1)	9
Share-based compensation expense	99	75
Changes in assets and liabilities:
Net receivables	(388)	(318)
Other current assets	4	(18)
Other assets	(10)	(34)
Accounts payable and accrued liabilities	30	52
Accrued compensation and employee benefits	(614)	(579)
Accrued income taxes	18	45
Contributions to pension and other benefit plans in excess of current year expense/credit	(178)	(214)
Other liabilities	(10)	9
Effect of exchange rate changes	(24)	(29)
Net cash provided by operations	413	343
Financing cash flows:
Purchase of treasury shares	(500)	(400)
Net increase in commercial paper	175	100
Proceeds from issuance of debt	592	987
Repayments of debt	(6)	(256)
Shares withheld for taxes on vested units – treasury shares	(62)	(48)
Issuance of common stock from treasury shares	48	94
Payments of deferred and contingent consideration for acquisitions	(85)	(97)
Distributions of non-controlling interests	(11)	(13)
Dividends paid	(383)	(351)
Net cash (used for) provided by financing activities	(232)	16
Investing cash flows:
Capital expenditures	(135)	(144)
Net (purchases) sales of long-term investments	(3)	12
Proceeds from sales of fixed assets	1	4
Dispositions	4	0
Acquisitions	(144)	(412)
Other, net	(2)	2
Net cash used for investing activities	(279)	(538)
Effect of exchange rate changes on cash and cash equivalents	(71)	119
Decrease in cash and cash equivalents	(169)	(60)
Cash and cash equivalents at beginning of period	1,205	1,026
Cash and cash equivalents at end of period	$ 1,036	$ 966

XML

Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Shares	Non-Controlling Interests
Balance, beginning of year at Dec. 31, 2016		$ 561	$ 842	$ 12,388	$ (5,093)	$ (2,506)	$ 80
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accrued stock compensation costs			(10)
Issuance of shares under stock compensation plans and employee stock purchase plans			(69)			201
Cumulative effect of adoption of new revenue recognition standard and other new accounting standards				0	0
Cumulative effect of adoption of new revenue recognition standard and other new accounting standards | Accounting Standards Update 2014-09				0
Net income	$ 1,085			1,070			15
Dividend equivalents declared – (per share amounts: $1.165 in 2018 and $1.06 in 2017)				(2)
Dividends declared – (per share amounts: $1.165 in 2018 and $1.06 in 2017)				(541)
Other comprehensive income, net of tax	552				552
Purchase of treasury shares						(400)
Distributions and other changes							(14)
Balance, end of period at Jun. 30, 2017	7,074		763	12,915	(4,541)	(2,705)	81
Balance, beginning of year at Dec. 31, 2017	7,442	$ 561	784	13,140	(4,043)	(3,083)	83
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accrued stock compensation costs			(26)
Issuance of shares under stock compensation plans and employee stock purchase plans			(26)			140
Cumulative effect of adoption of new revenue recognition standard and other new accounting standards				0	(14)
Cumulative effect of adoption of new revenue recognition standard and other new accounting standards | Accounting Standards Update 2014-09				364
Net income	1,232			1,221			11
Net income | Accounting Standards Update 2014-09	1,232
Dividend equivalents declared – (per share amounts: $1.165 in 2018 and $1.06 in 2017)				(3)
Dividends declared – (per share amounts: $1.165 in 2018 and $1.06 in 2017)				(591)
Other comprehensive income, net of tax	(208)				(208)
Purchase of treasury shares						(500)
Distributions and other changes							(13)
Balance, end of period at Jun. 30, 2018	7,797		$ 732	$ 14,131	$ (4,265)	$ (3,443)	$ 81
Balance, end of period (Accounting Standards Update 2014-09) at Jun. 30, 2018	$ 7,797

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Consolidated Statements of Equity (Unaudited) (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Statement of Stockholders' Equity [Abstract]
Dividends declared per share (in dollars per share)	$ 1.165	$ 1.06
Dividend equivalents declared per share (in dollars per share)	$ 1.165	$ 1.06

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Nature of Operations

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Nature of Operations

Nature of Operations

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

The Risk and Insurance Services segment 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.

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. As of June 30, 2018, Mercer had assets under delegated management of approximately $240 billion worldwide. Oliver Wyman Group provides specialized management and economic and brand consulting services.

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

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Principles of Consolidation and Other Matters

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Principles of Consolidation and Other Matters

Principles of Consolidation and Other Matters

The consolidated financial statements included herein have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission. While certain information and footnote 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 for interim filings, 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, 2017 (the "2017 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 three and six month periods ended June 30, 2018 and 2017.

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 of approximately $189 million, primarily related to regulatory requirements outside the United States or as collateral under captive insurance arrangements.

Investments

The caption "Investment income" 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 debt 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 certain equity investments, that under legacy Generally Accepted Accounting Principles, were previously accounted as available for sale securities, whereby the mark-to-market change was recorded to other comprehensive income in its consolidated balance sheet. As discussed in Note 17, effective January 1, 2018, the Company adopted new accounting guidance that requires equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. The Company recorded a cumulative-effect adjustment that increased retained earnings as of the beginning of the period of adoption of $14 million, reflecting the reclassification of cumulative unrealized gains, net of tax as of December 31, 2017 from accumulated other comprehensive income to retained earnings. Prior periods have not been restated.

The Company holds investments in certain private equity funds that are accounted for under 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 gains of $28 million for both the three and six month periods ended June 30, 2018 and gains of $5 million for both the three and six month periods ended June 30, 2017. The three months ended June 30, 2018 includes gains of $26 million related to mark-to-market changes in securities with readily determinable market values and gains of $2 million related to investments in private equity funds. The six months ended June 30, 2018 includes gains of $19 million related to mark-to-market changes in securities with readily determinable market values and gains of $9 million related to investments in private equity funds. The prior period gains are related to the Company's investments in private equity funds.

Income Taxes

The Company's effective tax rate in the second quarter of 2018 was 25.6% compared with 28.6% in the second quarter of 2017. The effective tax rates for the first six months of 2018 and 2017 were 24.7% and 25.9%. The rate in the first half of 2018 reflects ongoing impacts of the Tax Cuts and Jobs Act (the "TCJA"), primarily the reduced 21% U.S. statutory rate and certain tax planning benefits, largely offset by higher estimated costs from the new territorial system, greater disallowance of compensation and entertainment deductions and a decrease in excess tax benefits related to share-based compensation. The tax rates in 2017 reflect foreign operations taxed at rates below the 35% U.S. statutory tax rate, including the effect of repatriation. The tax rates in both periods reflect the impact of discrete tax matters, tax legislation and nontaxable adjustments to contingent acquisition consideration.

As a result of TCJA, two discrete provisional charges were recorded in the fourth quarter of 2017. The transition to the new territorial tax system resulted in a transition tax payable over eight years on undistributed earnings of non-U.S. subsidiaries. This mandatory taxation of accumulated foreign earnings substantially changed the economic considerations of continued permanent investment of those accumulated earnings, a key component of the Company's global capital strategy. As a result of the transition tax, the Company anticipates repatriating the majority of the accumulated earnings that it previously intended to permanently invest. A charge of $240 million was recorded in the fourth quarter of 2017 as a provisional estimate of the transition tax and ancillary effects.

The provisional estimate of transition tax includes state taxes and foreign withholding taxes related to the change in the Company's indefinite reinvestment assertion with respect to its pre-2018 foreign earnings. The Company previously considered most unremitted earnings of its non-U.S. subsidiaries, except amounts repatriated in the year earned, to be permanently reinvested and, accordingly, recorded no deferred U.S. income taxes on such earnings. The Company has initially analyzed its global capital requirements and potential tax liabilities attributable to repatriation. The Company estimates that it will repatriate $3.4 billion that was previously considered indefinitely invested. Included in the $240 million charge in 2017 is a $53 million provisional estimate for withholding and state income taxes.

In addition, reducing the U.S. corporate tax rate from 35% to 21% and the change in deductibility of certain compensation awards to certain executive officers of the Company effective on January 1, 2018, resulted in a net charge of $220 million in the fourth quarter of 2017 to reduce the value of our U.S. deferred tax assets and liabilities. Adjustments during the first half of 2018 to provisional estimates of transition taxes and U.S. deferred tax assets and liabilities increased income tax expense by $3 million. These estimates may be further adjusted during 2018 when the Company has finalized its analysis of all the relevant information.

In December of 2017, the SEC issued Staff Accounting Bulletin 118 ("SAB 118"), establishing a one-year measurement period to complete the accounting for the income tax effects of the TCJA. SAB 118 anticipates three alternative states of completion at the end of the reporting period of accounting for these effects: (1) the tax accounting work has been completed with respect to an item; (2) a provisional amount has been recognized because a reasonable estimate was possible, or (3) a reasonable estimate cannot be provided. The Company believes its analysis of the TCJA to date provides an appropriate basis to record a provisional estimate. Our provisional estimates include the effects of the deemed repatriation tax and the Company's position with respect to permanently reinvested earnings, the impact of the Global Intangible Low Taxed Income ("GILTI") provision and the remeasurement of U.S. deferred tax based on estimated enactment-date deferred tax balances, which may be adjusted in 2018 when the 2017 tax return is filed. TCJA’s transition tax requires detailed calculations of current and accumulated taxable earnings at the level of each foreign subsidiary, computed in functional currency at the greater of two alternative measurement dates and converted into U.S. dollars. In preparing its 2017 U.S. federal return the Company is performing these calculations for approximately seven hundred foreign subsidiaries. In the third quarter management expects to update its estimate of the transition tax, its global permanent investment strategy, and the impact on U.S. deferred tax assets from the change in tax rate. However, given the significant complexity of the TCJA and still-anticipated guidance from the U.S. Treasury about its implementation, these estimates may be further adjusted during the fourth quarter.

The Company is routinely examined by tax authorities in the jurisdictions in which it has significant operations. The Company regularly considers the likelihood of assessments in each of the taxing jurisdictions resulting from examinations. When evaluating the potential imposition of penalties, the Company considers a number of relevant factors under penalty statutes, including appropriate disclosure of the tax return position, the existence of legal authority supporting the Company's position and reliance on the opinion of professional tax advisors.

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 increased from $71 million at December 31, 2017 to $72 million at June 30, 2018 due to current accruals partially offset by settlements of audits and expirations of statutes of limitation. It is reasonably possible that the total amount of unrecognized tax benefits will decrease between zero and approximately $8 million within the next twelve months due to settlements of audits and expirations of statutes of limitation.

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Revenue

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenue

Revenue

2018 - Under the New Revenue Recognition Standard

In May 2014, the Financial Accounting Standards Board ("FASB") issued new accounting guidance related to revenue from contracts with customers. The core principle of the 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. To achieve that principle, the entity applies the following steps: 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.

The Company adopted the new guidance effective January 1, 2018, using the modified retrospective method, which applies the new guidance beginning in the year of adoption, with the cumulative effect of initially applying the guidance recognized as an adjustment to retained earnings at January 1, 2018. The Company elected to apply the modified retrospective method to all contracts. The comparative financial information included herein has not been restated and continues to be reported under the legacy accounting standards that were in effect for those periods.

In the first quarter of 2018, the Company recorded an increase to the opening balance of retained earnings of $364 million to reflect the cumulative effect of adopting this revenue standard. Other revenue included in the consolidated statements of income that is not from contracts with customers is less than one-quarter of one percent of total revenue, and therefore is not presented as a separate line item.

As discussed in more detail below, the adoption of this new revenue standard will shift income among quarters from historical patterns, but is not expected to have a significant year-over-year impact on annual revenue.

Risk and Insurance Services

Risk and Insurance Services revenue reflects compensation for brokerage and consulting services through commissions and fees. Commission rates and fees vary in amount and can depend upon a number of factors, including the type of insurance or reinsurance coverage provided, the particular insurer or reinsurer selected, and the capacity in which the broker acts and negotiates with clients. For the majority of the insurance and reinsurance brokerage arrangements, advice and services provided which culminate in the placement of an effective policy are considered a single performance obligation. Arrangements with clients may include the placement of a single policy, multiple policies or a combination of policy placements and other services. Consideration related to such "bundled arrangements" is allocated to the individual performance obligations based on their relative fair value. Revenue for policy placement is generally recognized on the policy effective date, at which point control over the services provided by the Company has transferred to the client and the client has accepted the services. The contractual terms for certain fee based brokerage arrangements meet the criteria for revenue recognition over time. For such arrangements, revenue is recognized using output measures, which correspond to the progress toward completing the performance obligation. Fees for non-risk transfer services provided to clients are recognized over time in the period the services are provided, using a proportional performance model, primarily based on input measures. These measures of progress provide a faithful depiction of the progress towards completion of the performance obligation.

Revenue related to reinsurance brokerage for excess of loss ("XOL") treaties is estimated based on contractually specified minimum or deposit premiums, and adjusted as additional evidence of the ultimate amount of brokerage is received. Revenue for quota share treaties is estimated based on indications of estimated premium income provided by the ceding insurer. The estimated brokerage revenue recognized for quota share treaties is constrained to an amount that is probable to not have a significant negative adjustment. The estimated revenue and the constraint are evaluated as additional evidence of the ultimate amount of underlying risks to be covered is received over the 12 to 18 months following the effective date of the placement.

In addition to commissions and fees from its clients, the Company also receives other compensation from insurance companies. This other insurer compensation includes, among other things, payments for consulting and analytics services provided to insurers, fees for administrative and other services provided to or on behalf of insurers (including services relating to the administration and management of quota shares, panels and other facilities in which insurers participate). The Company is also eligible for certain contingent commissions from insurers based on the attainment of specified metrics (i.e., volume and loss ratio measures) relating to Marsh's placements, particularly in Marsh & McLennan Agency ("MMA") and in parts of Marsh's international operations. Revenue for contingent commissions from insurers is estimated based on historical evidence of the achievement of the respective contingent metrics and recorded as the underlying policies that contribute to the achievement of the metric are placed. Due to the uncertainty of the amount of contingent consideration that will be received, the estimated revenue is constrained to an amount that is probable to not have a significant negative adjustment. Contingent consideration is generally received in the first quarter of the subsequent year.

A significant majority of the Company's Risk and Insurance Services revenue is for performance obligations recognized at a point in time. Marsh and Guy Carpenter also receive interest income on certain funds (such as premiums and claims proceeds) held in a fiduciary capacity for others.

Insurance brokerage commissions are generally invoiced on the policy effective date. Fee based arrangements generally include a percentage of the total fee due upon signing the arrangement, with additional fixed installments payable over the remainder of the year. Payment terms range from receipt of invoice up to 30 days from invoice date.

Reinsurance brokerage is recognized on the effective date of the treaty. Payment terms depend on the type of reinsurance. For XOL treaties, brokerage is typically collected in four installments during an annual treaty period based on a contractually specified minimum or deposit premium. For proportional or quota share treaties, brokerage is billed as underlying insured risks attach to the reinsurance treaty, generally over 12 to 18 months.

Consulting

The major component of revenue in the Consulting business is fees paid by clients for advice and services. Mercer, principally through its health line of business, also receives revenue in the form of commissions received from insurance companies for the placement of group (and occasionally individual) insurance contracts, primarily health, life and accident coverages. Revenue for Mercer’s investment management business and certain of Mercer’s defined benefit administration services consists principally of fees based on assets under delegated management or administration.

Consulting projects in Mercer’s wealth and career businesses, as well as consulting projects in Oliver Wyman typically consist of a single performance obligation, which is recognized over time as control is transferred continuously to customers. Typically, revenue is recognized over time using an input measure of time expended to date relative to total estimated time incurred at project completion. Incurred hours represent services rendered and thereby faithfullydepicts the transfer of control to the customer.

On a limited number of engagements, performance fees may also be earned for achieving certain prescribed performance criteria. Revenue for achievement is estimated and constrained to an amount that is probable to not have a significant negative adjustment.

A significant majority of fee revenues in the Consulting segment is recognized over time.

For consulting projects, Mercer generally invoices monthly in arrears with payment due within 30 days of the invoice date. Fees for delegated management services are either deducted from the net asset value of the fund or invoiced to the client on monthly or quarterly basis in arrears. Oliver Wyman typically bills its clients 30-60 days in arrears with payment due upon receipt of the invoice.

Health brokerage and consulting services are components of both Marsh, which includes MMA, and Mercer, with approximately 70% of such revenues reported in Mercer. Health contracts typically involve a series of distinct services that are treated as a single performance obligation. Revenue for these services is recognized over time based on the amount of remuneration the Company expects to be entitled in exchange for these services. Payments for health brokerage and consulting services are typically paid monthly in arrears from carriers based on insured lives under the contract.

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

	Three Months Ended June 30,		Six Months Ended June 30,
	2018		2018
Marsh:
EMEA	$	526	$	1,169
Asia Pacific	183		347
Latin America	99		183
Total International	808		1,699
U.S./Canada	941		1,744
Total Marsh	1,749		3,443
Guy Carpenter	332		969
Subtotal	2,081		4,412
Fiduciary interest income	15		28
Total Risk and Insurance Services	$	2,096	$	4,440
Mercer:
Defined Benefit Consulting & Administration	$	320	$	659
Investment Management & Related Services	232		458
Total Wealth	552		1,117
Health	429		871
Career	177		341
Total Mercer	1,158		2,329
Oliver Wyman	492		989
Total Consulting	$	1,650	$	3,318

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

(In millions)	January 1, 2018		June 30, 2018
Contract Assets	$	128	$	178
Contract Liabilities	$	583	$	647

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. Estimated revenue related to achievement of volume or loss ratio metrics cannot be billed or collected until all related policy placements are completed and the contingency is resolved. The change in contract assets from January 1, 2018 to June 30, 2018 is primarily due to $215 million of additions during the period partly offset by $166 million transferred to accounts receivables, as the rights to bill and collect became unconditional. Contract assets are included in other current assets in the Company's consolidated balance sheet. Contract liabilities primarily relate to the advance consideration received from customers. Contract liabilities are included in current liabilities in the Company's consolidated balance sheet. Revenue recognized in the first six months of 2018 that was included in the contract liability balance at the beginning of the year was $334 million. The amount of revenue recognized in the first six months of 2018 from performance obligations satisfied in previous periods, mainly due to variable consideration from contracts with insurers, quota share and excess of loss business and consulting contracts previously considered constrained was $36 million.

The Company applies the practical expedient and therefore 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 $48 million for Marsh, $450 million for Mercer and $2 million for Oliver Wyman. The Company expects revenue in 2019, 2020, 2021, 2022 and 2023 and beyond of $239 million, $129 million, $74 million, $41 million and $17 million, respectively, related to these performance obligations.

Costs to Obtain and Fulfill a Contract

Under the new standard, certain costs to obtain or fulfill a contract that were previously expensed as incurred have been capitalized.

The Company capitalized the incremental costs to obtain contracts primarily related to commissions or sales bonus payments. These deferred costs are amortized over the expected life of the underlying customer relationships.

In Risk and Insurance Services, the Company capitalizes certain pre-placement costs that are considered fulfillment costs that meet the following criteria: these costs 1) relate directly to a contract, 2) enhance resources used to satisfy the Company’s performance obligation and 3) are expected to be recovered through revenue generated by the contract. These costs are amortized at a point in time when the associated revenue is recognized.

In Consulting, the Company incurs implementation costs necessary to facilitate the delivery of the contracted services. These costs are capitalized and amortized over the initial contract term plus expected renewal periods.

At June 30, 2018, the Company’s capitalized assets related to deferred implementation costs, costs to obtain and costs to fulfill were $39 million, $196 million and $154 million, respectively. Costs to obtain and deferred implementation costs are primarily included in other assets and costs to fulfill are primarily included in other current assets in the Company's consolidated balance sheet. The Company recorded amortization expense of $261 million and $557 million for the three and six month periods ended June 30, 2018, respectively, related to these capitalized costs.

The Company has elected to use the practical expedient and recognizes the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets is one year or less.

2017 - Revenue Recognized Under Guidance in Effect Prior to 2018

Risk and Insurance Services revenue includes insurance commissions, fees for services rendered and interest income on certain fiduciary funds. Insurance commissions and fees for risk transfer services generally were recorded as of the effective date of the applicable policies or, in certain cases (primarily in the Company's reinsurance broking operations), as of the effective date or billing date, whichever is later. A reserve for policy cancellation was provided based on historic and current data on cancellations. Consideration for fee arrangements covering multiple insurance placements, the provision of risk management and/or other services was allocated to all deliverables on the basis of the relative selling prices. Fees for non-risk transfer services provided to clients are recognized over the period in which the services are provided, using a proportional performance model. Fees resulting from achievement of certain performance thresholds are recorded when such levels are attained and such fees are not subject to forfeiture.

In the Consulting segment, the adoption of the new revenue standard did not have a significant impact on the timing of revenue recognition in the quarter.

See Note 17 for further discussion on the impact the new revenue recognition standard has on the Company's consolidated statements of income when comparing the 2018 financial information versus 2017.

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Fiduciary Assets and Liabilities

6 Months Ended

Jun. 30, 2018

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. Unremitted insurance premiums and claims proceeds are held by the Company in a fiduciary capacity. Risk and Insurance Services revenue includes interest on fiduciary funds of$15 million and $28 million for the three and six months ended June 30, 2018, respectively, and $9 million and $17 million for the three and six month periods ended June 30, 2017, respectively. The Consulting segment recorded fiduciary interest income of $1 million and $2 million for the three and six months ended June 30, 2018, respectively, and less than $1 millionand $1 millionfor the three and six months ended June 30,2017, respectively. 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 $8.3 billion at June 30, 2018 and $6.8 billion atDecember 31, 2017. 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

6 Months Ended

Jun. 30, 2018

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 June 30,				Six Months Ended June 30,
(In millions, except per share amounts)	2018		2017		2018		2017
Net income before non-controlling interests	$	536	$	507	$	1,232	$	1,085
Less: Net income attributable to non-controlling interests	5		6		11		15
Net income attributable to the Company	$	531	$	501	$	1,221	$	1,070
Basic weighted average common shares outstanding	507		514		507		514
Dilutive effect of potentially issuable common shares	5		6		6		7
Diluted weighted average common shares outstanding	512		520		513		521
Average stock price used to calculate common stock equivalents	$	81.64	$	75.41	$	82.24	$	73.36

There were 10.5 million and 12.4 million stock options outstanding as of June 30, 2018 and 2017, respectively.

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Supplemental Disclosures to the Consolidated Statements of Cash Flows

6 Months Ended

Jun. 30, 2018

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 six-month periods ended June 30, 2018 and 2017.

(In millions)	2018			2017
Assets acquired, excluding cash	$	204		$	576
Liabilities assumed	(28		)	(74		)
Contingent/deferred purchase consideration	(32		)	(90		)
Net cash outflow for current year acquisitions	$	144		$	412

(In millions)	2018		2017
Interest paid	$	107	$	92
Income taxes paid, net of refunds	$	349	$	297

The classification of contingent consideration in the statement of cash flows is determined by 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 $85 million for the six months ended June 30, 2018. This consisted of deferred purchase consideration related to prior years' acquisitions of $53 million and contingent consideration of $32 million. For the six months ended June 30, 2017, the Company paid deferred and contingent consideration of $97 million, consisting of deferred purchase consideration related to prior years' acquisitions of $37 million and contingent consideration of $60 million.

The following amounts are included in the operating section of the consolidated statements of cash flows. For the six months ended June 30, 2018, the Company recorded an expense for adjustments to contingent consideration liabilities of $11 million and made contingent consideration payments of $9 million. For the six months ended June 30, 2017, the Company recorded a net credit for adjustments to contingent consideration liabilities of $8 million and made contingent consideration payments of $5 million.

The Company had non-cash issuances of common stock under its share-based payment plan of $128 million and $87 million for the six months ended June 30, 2018 and 2017, respectively. The Company recorded stock-based compensation expense for equity awards related to restricted stock units, performance stock units and stock options of $99 million and $75 million for the six-month periods ended June 30, 2018 and 2017, respectively.

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Other Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2018

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 six-month period ended June 30, 2018 and 2017, including amounts reclassified out of AOCI, are as follows:

(In millions)	Unrealized Investment Gains (Losses)		Pension/Post-Retirement Plans Gains (Losses)			Foreign Currency Translation Gains (Losses)			Total Gains (Losses)
Balance as of April 1, 2018	$	—	$	(2,963	)	$	(942	)	$	(3,905	)
Other comprehensive income (loss) before reclassifications	—		129			(516		)	(387		)
Amounts reclassified from accumulated other comprehensive income	—		27			—			27
Net current period other comprehensive income (loss)	—		156			(516		)	(360		)
Balance as of June 30, 2018	$	—	$	(2,807	)	$	(1,458	)	$	(4,265	)

(In millions)	Unrealized Investment Gains		Pension/Post-Retirement Plans Gains (Losses)			Foreign Currency Translation Gains (Losses)			Total Gains (Losses)
Balance as of April 1, 2017	$	16	$	(3,208	)	$	(1,645	)	$	(4,837	)
Other comprehensive income (loss) before reclassifications	14		(40		)	289			263
Amounts reclassified from accumulated other comprehensive income	—		33			—			33
Net current period other comprehensive income (loss)	14		(7		)	289			296
Balance as of June 30, 2017	$	30	$	(3,215	)	$	(1,356	)	$	(4,541	)

(In millions)	Unrealized Investment Gains (Losses)			Pension/Post-Retirement Plans Gains (Losses)			Foreign Currency Translation Gains (Losses)			Total Gains (Losses)
Balance as of December 31, 2017	$	14		$	(2,892	)	$	(1,165	)	$	(4,043	)
Cumulative effect of amended accounting standard	(14		)	—			—			(14		)
Other comprehensive income (loss) before reclassifications	—			29			(293		)	(264		)
Amounts reclassified from accumulated other comprehensive income	—			56			—			56
Net current period other comprehensive income (loss)	—			85			(293		)	(208		)
Balance as of June 30, 2018	$	—		$	(2,807	)	$	(1,458	)	$	(4,265	)

(In millions)	Unrealized Investment Gains		Pension/Post-Retirement Plans Gains (Losses)			Foreign Currency Translation Gains (Losses)			Total Gains (Losses)
Balance as of December 31, 2016	$	19	$	(3,232	)	$	(1,880	)	$	(5,093	)
Other comprehensive income (loss) before reclassifications	11		(46		)	524			489
Amounts reclassified from accumulated other comprehensive income	—		63			—			63
Net current period other comprehensive income (loss)	11		17			524			552
Balance as of June 30, 2017	$	30	$	(3,215	)	$	(1,356	)	$	(4,541	)

The components of other comprehensive income (loss) for the three and six-month period ended June 30, 2018 and 2017 are as follows:

Three Months Ended June 30,	2018									2017
(In millions)	Pre-Tax			Tax (Credit)			Net of Tax			Pre-Tax			Tax (Credit)			Net of Tax
Foreign currency translation adjustments	$	(529	)	$	(13	)	$	(516	)	$	290		$	1		$	289
Unrealized investment gains	—			—			—			24			10			14
Pension/post-retirement plans:
Amortization of losses included in net periodic pension cost:
Prior service credits (a)	(1		)	—			(1		)	—			—			—
Net actuarial losses (a)	37			9			28			42			9			33
Subtotal	36			9			27			42			9			33
Effect of remeasurement	—			—			—			—			1			(1		)
Foreign currency translation adjustments	156			27			129			(47		)	(8		)	(39		)
Pension/post-retirement plans gains (losses)	192			36			156			(5		)	2			(7		)
Other comprehensive (loss) income	$	(337	)	$	23		$	(360	)	$	309		$	13		$	296
(a) Components of net periodic pension cost are included in compensation and benefits in the consolidated statements of income. Income tax credits on prior service costs and net actuarial losses are included in income tax expense.

Six Months Ended June 30,	2018									2017
(In millions)	Pre-Tax			Tax (Credit)			Net of Tax			Pre-Tax			Tax (Credit)			Net of Tax
Foreign currency translation adjustments	$	(301	)	$	(8	)	$	(293	)	$	525		$	1		$	524
Unrealized investment gains	—			—			—			19			8			11
Pension/post-retirement plans:
Amortization of losses included in net periodic pension cost:
Prior service credits (a)	(2		)	—			(2		)	—			—			—
Net actuarial losses (a)	74			16			58			82			19			63
Subtotal	72			16			56			82			19			63
Effect of remeasurement	—			—			—			9			3			6
Effect of curtailment	—			—			—			(1		)	—			(1		)
Effect of settlement	—			—			—			1			—			1
Foreign currency translation adjustments	36			7			29			(62		)	(11		)	(51		)
Other	—			—			—			(1		)	—			(1		)
Pension/post-retirement plans gains	108			23			85			28			11			17
Other comprehensive (loss) income	$	(193	)	$	15		$	(208	)	$	572		$	20		$	552
(a) Components of net periodic pension cost are included in other net benefit credits in the consolidated statements of income. Tax on prior service costs and net actuarial losses is included in income tax expense.

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Acquisitions

6 Months Ended

Jun. 30, 2018

Business Combinations [Abstract]

Acquisitions

Acquisitions

The Company's strategy includes growing its businesses and building shareholder value through strategic acquisitions. 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 lists, developed technology, trademarks and non-compete agreements. The valuation of purchased intangible assets involves significant estimates and assumptions. 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 seven acquisitions during the first six months of 2018.

• February – MMA acquired Highsmith Insurance Agency, a North Carolina-based independent insurance brokerage firm.

• March – Marsh acquired Hoken Soken, Inc., a Japan-based insurance agency.

• May – Marsh acquired Mountlodge Limited, a Scotland-based independent insurance broker and Lorant Martínez Salas y Compañía Agente de Seguros y de Fianzas, S.A. de C.V., a Mexico-based multi-line insurance broker.

• June – MMA acquired Bleakley Insurance Services, a California-based provider of employee benefits solutions; Klein Agency, Inc., a Minnesota-based surety and property/casualty agency; and Insurance Associates, Inc., a Maryland-based independent insurance agency.

The Consulting segment completed five acquisitions during the first six months of 2018.

• January – Oliver Wyman acquired Draw Ltd., a U.K.-based digital transformation agency.

• March – Oliver Wyman acquired 8Works Limited, a U.K.-based design thinking consultancy.

• May – Mercer acquired EverBe SAS, a France-based Workday implementer and advisory firm; and Evolve Intelligence Pty Ltd., an Australia-based talent strategy firm.

• June – Mercer acquired India Life Capital Private Ltd., an India-based investment advisor.

Total purchase consideration for acquisitions made during the six months ended June 30, 2018 was $192 million, which consisted of cash paid of $160 million and deferred purchase and estimated contingent consideration of $32 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 fair value of the contingent consideration was based on projected revenue or EBITDA of the acquired entities. Estimated fair values of assets acquired and liabilities assumed are subject to adjustment when purchase accounting is finalized. The Company also paid $53 million of deferred purchase consideration and $41 million of contingent consideration related to acquisitions made in prior years.

The following table presents the preliminary allocation of the acquisition cost to the assets acquired and liabilities assumed during 2018 based on their fair values:

For the Six Months Ended June 30, 2018
(In millions)
Cash	$	160
Estimated fair value of deferred/contingent consideration	32
Total Consideration	$	192
Allocation of purchase price:
Cash and cash equivalents	$	16
Accounts receivable, net	12
Property, plant, and equipment	3
Other intangible assets	73
Goodwill	116
Total assets acquired	220
Current liabilities	10
Other liabilities	18
Total liabilities assumed	28
Net assets acquired	$	192

Other intangible assets acquired are based on initial estimates and subject to change based on final valuations during the measurement period post acquisition date. The following chart provides information about other intangible assets acquired during 2018:

	Amount		Weighted Average Amortization Period
Client relationships	$	72	9 years
Other	1		4 years
	$	73

Prior-Year Acquisitions

The Risk and Insurance Services segment completed seven acquisitions during 2017.

• January – MMA acquired J. Smith Lanier & Co. ("JSL"), a privately held insurance brokerage firm providing insurance, risk management, and employee benefits solutions to businesses and individuals throughout the U.S.

• February – MMA acquired iaConsulting, a Texas-based employee benefits consulting firm.

• March – MMA acquired Blakestad, Inc., a Minnesota-based private client and commercial lines insurance agency, and RJF Financial Services, a Minnesota-based retirement advisory firm.

• May – MMA acquired Insurance Partners of Texas, a Texas-based employee benefits consulting firm.

• August – Marsh acquired International Catastrophe Insurance Managers, LLC, a Colorado-based managing general agent providing property catastrophe insurance to business and homeowners, and MMA acquired Hendrick & Hendrick, Inc., a Texas-based insurance agency.

The Consulting segment completed three acquisitions during 2017.

• August – Mercer acquired Jaeson Associates, a Portugal-based talent management consulting organization.

• December – Mercer acquired Promerit AG, a Germany-based consultancy specializing in HR digitalization and business and HR transformation and BFC Asset Management Co., Ltd., a Japan-based independently owned asset manager, focused on alternative investment strategies.

Total purchase consideration for acquisitions made during the first six months of 2017 was $510 million, which consisted of cash paid of $420 million and deferred purchase and estimated contingent consideration of $90 million. Contingent consideration arrangements are primarily based on EBITDA or revenue targets over a period of two to four years. The fair value of the contingent consideration was based on projected revenue or earnings of the acquired entities. Estimated fair values of assets acquired and liabilities assumed are subject to adjustment when purchase accounting is finalized. In the first six months of 2017, the Company also paid $37 million of deferred purchase consideration and $65 million of contingent consideration related to acquisitions made in prior years.

Pro-Forma Information

The following unaudited pro-forma financial data gives effect to the acquisitions made by the Company during 2018 and 2017. In accordance with accounting guidance related to pro-forma disclosures, the information presented for current year acquisitions is as if they occurred on January 1, 2017 and reflects acquisitions made in 2017 as if they occurred on January 1, 2016. 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 June 30,				Six Months Ended June 30,
(In millions, except per share figures)	2018		2017		2018		2017
Revenue	$	3,748	$	3,539	$	7,770	$	7,098
Net income attributable to the Company	$	532	$	503	$	1,225	$	1,072
Basic net income per share attributable to the Company	$	1.05	$	0.98	$	2.41	$	2.08
Diluted net income per share attributable to the Company	$	1.04	$	0.97	$	2.39	$	2.06

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 six month periods ended June 30, 2018 include approximately $11 million and $14 million of revenue, respectively, and an operating loss of $1 million and $2 million, respectively, for acquisitions made in 2018. The consolidated statements of income for the three and six month periods ended June 30, 2017 included $34 million and $63 million of revenue, respectively, and operating income of $5 million and $15 million, respectively, related to acquisitions made in 2017.

Subsequent Events

On June 25th, the Company announced an agreement to acquire Wortham Insurance, a Houston based independent insurance broker with more than $130 million of revenue and 530colleagues. The transaction is expected to close in the third quarter of 2018.

In July, 2018, the Company entered into a agreement to sell Marsh ClearSight, a cloud based technology platform. The disposal of Marsh ClearSight is not expected to have a significant impact on the Company’s ongoing revenue or results of operations.

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Goodwill and Other Intangibles

6 Months Ended

Jun. 30, 2018

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, the Company assesses qualitative factors to determine whether it is necessary to perform the two-step goodwill impairment test. As part of its assessment, the Company considers numerous factors, including that the fair value of each reporting unit exceeds its carrying value by a substantial margin based on its most recent estimates, 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 2017 and concluded that a two-step goodwill impairment test was not required in 2017 and that goodwill was not impaired.

Changes in the carrying amount of goodwill are as follows:

June 30,
(In millions)	2018			2017
Balance as of January 1,	$	9,089		$	8,369
Goodwill acquired	116			370
Other adjustments(a)	(28		)	82
Balance at June 30,	$	9,177		$	8,821

^(a) Primarily reflects the impact of foreign exchange.

Goodwill allocable to the Company’s reportable segments at June 30, 2018 is as follows: Risk and Insurance Services, $6.5 billion and Consulting, $2.7 billion.

Other intangible assets that are not deemed to have an indefinite life are amortized over their estimated lives and reviewed for impairment upon the occurrence of certain triggering events in accordance with applicable accounting literature.

The gross cost and accumulated amortization at June 30, 2018 and December 31, 2017 are as follows:

	June 30, 2018						December 31, 2017
(In millions)	Gross Cost		Accumulated Amortization		Net Carrying Amount		Gross Cost		Accumulated Amortization		Net Carrying Amount
Client Relationships	$	1,711	$	580	$	1,131	$	1,672	$	518	$	1,154
Other (a)	237		134		103		234		114		120
Amortized intangibles	$	1,948	$	714	$	1,234	$	1,906	$	632	$	1,274

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

Aggregate amortization expense for the six months ended June 30, 2018 and2017 was $88 million and $80 million, respectively. The estimated future aggregate amortization expense is as follows:

For the Years Ending December 31,
(In millions)	Estimated Expense
2018 (excludes amortization through June 30, 2018)	$	94
2019	173
2020	154
2021	143
2022	132
Subsequent years	538
	$	1,234

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Fair Value Measurements

6 Months Ended

Jun. 30, 2018

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).

The Company does not have any assets or liabilities that are measured using Level 2 inputs.

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.

Liabilities measured using Level 3 inputs include liabilities for contingent purchase consideration.

Valuation Techniques

Equity Securities, Money Market 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 funds are valued using a valuation technique that results in price per share at $1.00.

Contingent Purchase Consideration Liability – Level 3

Purchase consideration for some acquisitions made by the Company includes contingent consideration arrangements. These arrangements typically provide for the payment of additional consideration if earnings or revenue targets are met over periods from two to four years. The fair value of the contingent purchase consideration 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 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 June 30, 2018 and December 31, 2017.

	Identical Assets (Level 1)				Observable Inputs (Level 2)				Unobservable Inputs (Level 3)				Total
(In millions)	06/30/18		12/31/17		06/30/18		12/31/17		06/30/18		12/31/17		06/30/18		12/31/17
Assets:
Financial instruments owned:
Exchange traded equity securities(a)	$	99	$	81	$	—	$	—	$	—	$	—	$	99	$	81
Mutual funds(a)	144		158		—		—		—		—		144		158
Money market funds(b)	33		143		—		—		—		—		33		143
Total assets measured at fair value	$	276	$	382	$	—	$	—	$	—	$	—	$	276	$	382
Fiduciary Assets:
Money market funds	$	129	$	111	$	—	$	—	$	—	$	—	$	129	$	111
Total fiduciary assets measured at fair value	$	129	$	111	$	—	$	—	$	—	$	—	$	129	$	111
Liabilities:
Contingent purchase consideration liability(c)	$	—	$	—	$	—	$	—	$	185	$	189	$	185	$	189
Total liabilities measured at fair value	$	—	$	—	$	—	$	—	$	185	$	189	$	185	$	189

^(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 accounts payable and accrued liabilities and other liabilities in the consolidated balance sheets.

During the six-month period ended June 30, 2018, there were no assets or liabilities that were transferred between any of the levels.

The table below sets forth a summary of the changes in fair value of the Company’s Level 3 liabilities for the three and six month periods ending June 30, 2018 and 2017 that represent contingent consideration related to acquisitions:

	Three Months Ended June 30,						Six Months Ended June 30,
(In millions)	2018			2017			2018			2017
Balance at beginning of period,	$	161		$	247		$	189		$	241
Additions	20			—			26			34
Payments	(1		)	(53		)	(41		)	(65		)
Revaluation Impact	6			8			11			(8		)
Other (a)	(1		)	1			—			1
Balance at June 30,	$	185		$	203		$	185		$	203

^(a) Primarily reflects the impact of foreign exchange.

The fair value of the contingent purchase consideration liability is based on projections of revenue and EBITDA for the acquired entities in relation to the established targets and is reassessed on a quarterly basis. As set forth in the table above, based on the Company's ongoing assessment of the fair value of contingent consideration, the Company recorded a net increase in the estimated fair value of such liabilities for prior-period acquisitions of $11 million in the six-month period ended June 30, 2018. A 5% increase in the above mentioned projections would increase the liability by approximately $22 million. A 5% decrease in the above mentioned projections would decrease the liability by approximately $23 million.

Long-Term Investments

The Company holds investments in certain private equity investments, public companies and private companies that are accounted for using the equity method of accounting. The carrying value of these investments was $391 million and $405 million at June 30, 2018 and December 31, 2017, respectively.

Investments Accounted For Using the Equity Method of Accounting

Investments in Public and Private Companies

Alexander Forbes: The Company owns approximately 33% of the common stock of Alexander Forbes, a South African company listed on the Johannesburg Stock Exchange, which it purchased in 2014 for 7.50 South African Rand per share. As of June 30, 2018, the carrying value of the Company’s investment in Alexander Forbes was approximately $246 million. As of June 30, 2018, the market value of the approximately 443 million shares of Alexander Forbes owned by the Company, based on the June 30, 2018 closing share price of 5.77 South African Rand per share, was approximately $188 million. The Company considered several factors in assessing its investment in Alexander Forbes, including its financial position, the near- and long-term prospects of Alexander Forbes and the broader South African economy and capital markets, the length of time and extent to which the market value was below cost and the Company’s intent and ability to retain the investment for a sufficient period of time to allow for anticipated recovery in market value. During the first six months of 2018, the Alexander Forbes average opening and closing stock price was approximately 6.66 Rand (approximately 89% of the original purchase price) and ranged from a low of 5.00 Rand (in mid June) to a high of 7.34 Rand (in late March) (approximately 67% to 98% of the purchase price) and traded within 10% of its purchase price as recently as early-June. The trading price declined further during July, 2018. Based on its assessment of the factors discussed above, in particular the relatively short period during which the shares traded significantly below their purchase price, and the Company’s intention to continue to hold the shares for a period of time sufficient to allow for recovery, the Company determined the investment was not impaired. However, if the share price does not recover in future periods, an impairment charge for an "other than temporary" decline in value of its investment could be incurred.

The Company has other investments in private insurance and consulting companies with a carrying value of $63 million at both June 30, 2018 and December 31, 2017.

The Company’s investment in Alexander Forbes and its other equity investments in private insurance and consulting companies 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 on a one quarter lag basis.

Private Equity Investments

The Company's investments in private equity funds were $82 million and $76 million at June 30, 2018 and December 31, 2017, 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.

Other Investments

At June 30, 2018 the Company held certain equity investments with readily determinable market values of $113 million. During the first six months of 2018, the Company recorded an investment gain of $19 million, which reflects the increase in the market value of these investments as compared to December 31, 2017. The Company also holds investments without readily determinable market values of $64 million at June 30, 2018.

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Retirement Benefits

6 Months Ended

Jun. 30, 2018

Defined Benefit Plan [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. Plan was 64% equities and equity alternatives and 36% fixed income and at June 30, 2018 the actual allocation for the Company's U.S. Plan was 63% equities and equity alternatives and 37% fixed income. The target allocation for the U.K. Plans at June 30, 2018 was34% equities and equity alternatives and 66% fixed income. At June 30, 2018, the actual allocation for the U.K. Plans was 35% equities and equity alternatives and 65% fixed income. The Company's U.K. Plans comprised approximately 81% of non-U.S. plan assets at December 31, 2017. 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 and other post-retirement plans are as follows:

Combined U.S. and significant non-U.S. plans	Pension Benefits						Post-retirement Benefits
For the Three Months Ended June 30,
(In millions)	2018			2017			2018			2017
Service cost	$	7		$	19		$	—		$	—
Interest cost	117			124			1			1
Expected return on plan assets	(218		)	(230		)	—			—
Amortization of prior service cost	(1		)	(1		)	(1		)	—
Recognized actuarial loss	37			43			—			—
Net periodic benefit (credit) cost	$	(58	)	$	(45	)	$	—		$	1
Combined U.S. and significant non-U.S. plans	Pension Benefits						Post-retirement Benefits
For the Six Months Ended June 30,
(In millions)	2018			2017			2018			2017
Service cost	$	17		$	37		$	—		$	—
Interest cost	235			246			2			2
Expected return on plan assets	(439		)	(454		)	—			—
Amortization of prior service (credit) cost	(1		)	(1		)	(2		)	1
Recognized actuarial loss	74			83			—			—
Net periodic benefit (credit) cost	$	(114	)	$	(89	)	$	—		$	3
Curtailment gain	—			(1		)	—			—
Settlement loss	—			1			—			—
Total (credit) cost	$	(114	)	$	(89	)	$	—		$	3

As discussed in Note 17, effective January 1, 2018, the Company adopted the new guidance that changes the presentation of net periodic pension cost and net periodic postretirement cost (''net periodic benefit costs"). The new guidance requires employers to report the service cost component of net periodic benefit costs in the same line item as other compensation costs in the income statement. The other components of net periodic benefit costs are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations. The new guidance requires retrospective application for the presentation of the service cost component and the other components of net periodic benefit costs. Accordingly, the Company has reclassified prior period information in the following chart to conform with the current year's presentation:

Amounts Recorded in the Consolidated Statement of Income
Combined U.S. and significant non-U.S. plans	Pension Benefits						Post-retirement Benefits
For the Three Months Ended June 30,
(In millions)	2018			2017			2018		2017
Compensation and benefits expense (Operating income)	$	7		$	19		$	—	$	—
Other net benefit credits	(65		)	(64		)	—		1
Total (credit) cost	$	(58	)	$	(45	)	$	—	$	1

Amounts Recorded in the Consolidated Statement of Income
Combined U.S. and significant non-U.S. plans	Pension Benefits						Post-retirement Benefits
For the Six Months Ended June 30,
(In millions)	2018			2017			2018		2017
Compensation and benefits expense (Operating income)	$	17		$	37		$	—	$	—
Other net benefit credits	(131		)	(126		)	—		3
Total (credit) cost	$	(114	)	$	(89	)	$	—	$	3

U.S. Plans only	Pension Benefits						Post-retirement Benefits
For the Three Months Ended June 30,
(In millions)	2018			2017			2018			2017
Service cost	$	—		$	—		$	—		$	—
Interest cost	59			66			1			1
Expected return on plan assets	(90		)	(90		)	—			—
Amortization of prior service (credit) cost	—			—			(1		)	1
Recognized actuarial loss (gain)	14			10			—			(1		)
Net periodic benefit (credit) cost	$	(17	)	$	(14	)	$	—		$	1

U.S. Plans only	Pension Benefits						Post-retirement Benefits
For the Six Months Ended June 30,
(In millions)	2018			2017			2018			2017
Service cost	$	—		$	—		$	—		$	—
Interest cost	118			132			1			1
Expected return on plan assets	(179		)	(179		)	—			—
Amortization of prior service (credit) cost	—			—			(1		)	2
Recognized actuarial loss (gain)	27			19			—			(1		)
Net periodic benefit (credit) cost	$	(34	)	$	(28	)	$	—		$	2

Significant non-U.S. plans only	Pension Benefits						Post-retirement Benefits
For the Three Months Ended June 30,
(In millions)	2018			2017			2018		2017
Service cost	$	7		$	19		$	—	$	—
Interest cost	58			58			—		—
Expected return on plan assets	(128		)	(140		)	—		—
Amortization of prior service cost	(1		)	(1		)	—		(1		)
Recognized actuarial loss	23			33			—		1
Net periodic benefit (credit) cost	$	(41	)	$	(31	)	$	—	$	—

Significant non-U.S. plans only	Pension Benefits						Post-retirement Benefits
For the Six Months Ended June 30,
(In millions)	2018			2017			2018			2017
Service cost	$	17		$	37		$	—		$	—
Interest cost	117			114			1			1
Expected return on plan assets	(260		)	(275		)	—			—
Amortization of prior service credit	(1		)	(1		)	(1		)	(1		)
Recognized actuarial loss	47			64			—			1
Net periodic benefit (credit) cost	$	(80	)	$	(61	)	$	—		$	1
Curtailment gain	—			(1		)	—			—
Settlement loss	—			1			—			—
Total (credit) cost	$	(80	)	$	(61	)	$	—		$	1

In March 2017, the Company modified its defined benefit pension plans in Canada to discontinue further benefit accruals for participants after December 31, 2017 and replaced them with a defined contribution arrangement. The Company also amended its post-retirement benefits plan in Canada so that individuals who retire after April 1, 2019 will not be eligible to participate, except in certain situations. The Company re-measured the assets and liabilities of the plans, based on assumptions and market conditions on the amendment date.

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				Post-retirement Benefits
June 30,	2018		2017		2018		2017
Weighted average assumptions:
Expected return on plan assets	5.83	%	6.64	%	—		—
Discount Rate	3.07	%	3.40	%	3.21	%	3.64	%
Rate of compensation increase	1.73	%	1.77	%	—		—

The Company made approximately $55 million of contributions to its U.S. and non-U.S. defined benefit plans in the first six months of 2018. The Company expects to contribute approximately $54 million to its U.S. pension and non-U.S. pension plans during the remainder of 2018.

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 $67 million and $65 million for the six months ended June 30, 2018 and 2017, respectively. The cost of the U.K. DC Plans was $42 million and $38 million for the six months ended June 30, 2018 and 2017, respectively.

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Debt

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Debt

Debt

The Company’s outstanding debt is as follows:

(In millions)	June 30, 2018		December 31, 2017
Short-term:
Commercial paper	$	175	$	—
Current portion of long-term debt	264		262
	439		262
Long-term:
Senior notes – 2.55% due 2018	250		250
Senior notes – 2.35% due 2019	299		299
Senior notes – 2.35% due 2020	499		498
Senior notes – 4.80% due 2021	498		498
Senior notes – 2.75% due 2022	497		496
Senior notes – 3.30% due 2023	348		348
Senior notes – 4.05% due 2023	248		248
Senior notes – 3.50% due 2024	597		596
Senior notes – 3.50% due 2025	496		496
Senior notes – 3.75% due 2026	596		596
Senior notes – 5.875% due 2033	297		297
Senior notes – 4.35% due 2047	492		492
Senior notes – 4.20% due 2048	592		—
Mortgage – 5.70% due 2035	364		370
Other	4		3
	6,077		5,487
Less current portion	264		262
	$	5,813	$	5,225

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

The Company has established a short-term debt financing program of up to $1.5 billion through the issuance of commercial paper. The proceeds from the issuance of commercial paper are used for general corporate purposes. The Company had $175 million of commercial paper outstanding at June 30, 2018 at an effective interest rate of 2.25%.

In March 2018, the Company issued $600 million of 4.20% senior notes due 2048. The Company used the net proceeds for general corporate purposes.

In January 2017, the Company issued $500 million of 2.75% senior notes due 2022 and $500 million of 4.35% senior notes due 2047. The Company used the net proceeds for general corporate purposes, including the repayment of a $250 million debt maturity in April 2017.

The Company and certain of its foreign subsidiaries maintain a $1.5 billion multi-currency five-year unsecured revolving credit facility. The interest rate on this facility is based on LIBOR plus a fixed margin which varies with the Company's credit ratings. This facility expires in November 2020 and requires the Company to maintain certain coverage and leverage ratios which are tested quarterly. There were no borrowings outstanding under this facility at June 30, 2018.

Fair Value of Short-term and Long-term Debt

The estimated fair value of the Company’s short-term and long-term debt is provided below. Certain estimates and judgments were required to develop the fair value amounts. The fair value amounts shown below 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.

	June 30, 2018				December 31, 2017
(In millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Short-term debt	$	439	$	440	$	262	$	264
Long-term debt	$	5,813	$	5,826	$	5,225	$	5,444

The fair value of the Company’s short-term debt consists primarily of commercial paper and term debt maturing within the next year and its fair value approximates its carrying value. The estimated fair value of a primary portion 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- and long-term debt would be classified as Level 2 in the fair value hierarchy.

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Restructuring Costs

6 Months Ended

Jun. 30, 2018

Restructuring and Related Activities [Abstract]

Restructuring Costs

Restructuring Costs

During the second quarter of 2018, Marsh initiated a program to simplify the organization through reduced management layers and more common structures across regions and businesses to more closely align with its more formalized segmentation strategy across large risk management, middle market corporate, and small commercial & personal segments. These efforts are expected to create increased efficiencies and additional capacity for reinvestment in people and technology. During the quarter ended June 30, 2018, the Company incurred restructuring severance and consulting costs of $55 million related to this initiative.

In addition to the changes discussed above, the Company incurred $9 million of restructuring costs related to severance and future rent under non-cancelable leases. These costs were incurred in Risk and Insurance Services ($3 million), Consulting ($1 million) and Corporate ($5 million).

Details of the restructuring activity from January 1, 2017 through June 30, 2018, which includes liabilities from actions prior to 2018, are as follows:

(In millions)	Liability at 1/1/17		Amounts Accrued		Cash Paid			Other		Liability at 12/31/17		Amounts Accrued		Cash Paid			Other			Liability at 6/30/18
Severance	$	32	$	31	$	(49	)	$	1	$	15	$	51	$	(22	)	$	(1	)	$	43
Future rent under non-cancelable leases and other costs	61		9		(22		)	2		50		13		(19		)	—			44
Total	$	93	$	40	$	(71	)	$	3	$	65	$	64	$	(41	)	$	(1	)	$	87

The expenses associated with the above 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

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Common Stock

Common Stock

During the first six months of 2018, the Company repurchased approximately 6.1 million shares of its common stock for consideration of $500 million. In November 2016, 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. As of June 30, 2018, the Company remained authorized to repurchase up to approximately $1 billion in shares of its common stock. There is no time limit on the authorization. During the first six months of 2017, the Company repurchased approximately 5.4 million shares of its common stock for consideration of $400 million.

The Company issued approximately 2.5 million and 3.7 million shares related to stock compensation and employee stock purchase plans during the first six months of 2018 and 2017, respectively.

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Claims, Lawsuits And Other Contingencies

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Claims, Lawsuits, and Other Contingencies

Claims, Lawsuits and Other Contingencies

Litigation Matters

The Company and its subsidiaries are subject to a significant number of claims, lawsuits and proceedings in the ordinary course of 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 may 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 Group, 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.

Governmental Inquiries and Enforcement Matters

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

Risk and Insurance Services Segment

In April 2017, the Financial Conduct Authority in the United Kingdom (the "FCA") commenced a civil competition investigation into the aviation insurance and reinsurance sector. In connection with that investigation, the FCA carried out an on-site inspection at the London office of Marsh Limited, our Marsh and Guy Carpenter operating subsidiary in the United Kingdom. The FCA indicated that it had reasonable grounds for suspecting that Marsh Limited and other participants in the market have been sharing competitively sensitive information within the aviation insurance and reinsurance broking sector.

In October 2017, the Company received a notice that the Directorate-General for Competition of the European Commission had commenced a civil investigation of a number of insurance brokers, including Marsh, regarding "the exchange of commercially sensitive information between competitors in relation to aviation and aerospace insurance and reinsurance broking products and services in the European Economic Area ("EEA"), as well as possible coordination between competitors." In light of the action taken by the European Commission, the FCA informed Marsh Limited at the same time that it has discontinued its investigation under U.K. competition law. In May 2018, the FCA advised that it would not be taking any further action with Marsh Limited in connection with this matter.

In July 2017, the Directorate-General for Competition of the European Commission together with the Irish Competition and Consumer Protection Commission conducted on-site inspections at the offices of Marsh and other industry participants in Dublin in connection with an investigation regarding the "possible participation in anticompetitive agreements and/or concerted practices contrary to [E.U. competition law] in the market for commercial motor insurance in the Republic of Ireland."

We are cooperating with these investigations and are conducting our own reviews. At this time, we are unable to predict their likely timing, outcome or ultimate impact. There can be no assurance that the ultimate resolution of these or any related matters will not have a material adverse effect on our consolidated results of operations, financial condition or cash flows.

In November 2017, the FCA announced the terms of reference for a market study concerning the wholesale insurance broker sector in the United Kingdom, which affects Marsh and Guy Carpenter. The FCA is conducting the study to assess "how effectively competition is working in the wholesale insurance broker sector" and "how brokers influence competition in the underwriting sector." The FCA is expected to publish its interim report by the end of 2018, with a final report expected in 2019.

Consulting Segment

In June 2017, the FCA issued a final report in connection with a market study of the U.K. asset management industry, which includes asset managers and investment consultants, including Mercer. Following the report, in September 2017, the FCA announced its decision to refer the investment consultancy and fiduciary management markets to the U.K. Competition & Markets Authority (the "CMA") for a market investigation. In July 2018, the CMA published its Provisional Decision recommending industry-wide changes involving (i) implementation of mandatory tendering, (ii) enhanced fee disclosures and (iii) common standards for reporting performance. The CMA expects to conclude its investigation of the investment consultancy and fiduciary management markets not later than March 2019.

In the ordinary course of business, the Company is also subject to other investigations, market studies, subpoenas, lawsuits and other regulatory actions undertaken by governmental authorities.

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 were reinsured up to £40 million by a related party of River Thames. Payment of claims under the reinsurance agreement is collateralized by segregated assets held in a trust. As of June 30, 2018, the reinsurance coverage exceeded the best estimate of the projected liability of the policies covered by the guarantee. 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 15 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

6 Months Ended

Jun. 30, 2018

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 2017 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 six-month periods ended June 30, 2018 and 2017 are as follows:

	Three Months Ended June 30,							Six Months Ended June 30,
(In millions)	Revenue				Operating Income (Loss)			Revenue				Operating Income (Loss)
2018–
Risk and Insurance Services	$	2,096		(a)	$	472		$	4,440		(c)	$	1,188
Consulting	1,650			(b)	267			3,318			(d)	514
Total Operating Segments	3,746				739			7,758				1,702
Corporate / Eliminations	(12		)		(48		)	(24		)		(103		)
Total Consolidated	$	3,734			$	691		$	7,734			$	1,599
2017–
Risk and Insurance Services	$	1,916		(a)	$	482		$	3,905		(c)	$	1,050
Consulting	1,592			(b)	265			3,118			(d)	490
Total Operating Segments	3,508				747			7,023				1,540
Corporate / Eliminations	(13		)		(46		)	(25		)		(90		)
Total Consolidated	$	3,495			$	701		$	6,998			$	1,450

^(a)Includes inter-segment revenue of $4 million in 2017, interest income on fiduciary funds of $15 million and $9 million in 2018 and 2017, respectively, and equity method income of $7 million in both 2018 and 2017.

^(b)Includes inter-segment revenue of $12 million and $9 million in 2018 and 2017, respectively, interest income on fiduciary funds of $1 million and less than $1 million in 2018and2017, respectively, and equity method income of $5 million in both 2018 and in 2017.

^(c) Includes inter-segment revenue of $1 million and $4 million in 2018 and 2017, respectively, interest income on fiduciary funds of $28 million and $17 million in 2018 and 2017, respectively, and equity method income of $6 million and $9 million in 2018 and 2017, respectively.

^(d) Includes inter-segment revenue of $23 million and $21 million in 2018 and 2017, respectively, interest income on fiduciary funds of $2 million and $1 million in 2018 and 2017, respectively, and equity method income of $8 million in 2018 and $9 million in 2017, respectively.

Details of operating segment revenue for the three and six-month periods ended June 30, 2018 and 2017 are as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
(In millions)	2018			2017			2018			2017
Risk and Insurance Services
Marsh	$	1,760		$	1,621		$	3,463		$	3,223
Guy Carpenter	336			295			977			682
Total Risk and Insurance Services	2,096			1,916			4,440			3,905
Consulting
Mercer	1,158			1,109			2,329			2,186
Oliver Wyman Group	492			483			989			932
Total Consulting	1,650			1,592			3,318			3,118
Total Operating Segments	3,746			3,508			7,758			7,023
Corporate / Eliminations	(12		)	(13		)	(24		)	(25		)
Total	$	3,734		$	3,495		$	7,734		$	6,998

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New Accounting Guidance

6 Months Ended

Jun. 30, 2018

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

New Accounting Guidance

New Accounting Guidance

New Accounting Pronouncements Effective January 1, 2018:

The following new accounting standards were adopted using a modified retrospective approach through a cumulative-effect adjustment to retained earnings as of January 1, 2018:

New Revenue Recognition Standard

In May 2014, the FASB issued new accounting guidance related to revenue from contracts with customers. The core principle of the 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 Company adopted the new guidance effective January 1, 2018, using the modified retrospective method, which applies the new guidance beginning with the year of adoption, with the cumulative effect of initially applying the guidance recognized as an adjustment to retained earnings at January 1, 2018. The Company elected to apply the modified retrospective method to all contracts.

The guidance includes requirements to estimate variable or contingent consideration to be received, which will result in revenue being recognized earlier than under legacy GAAP. In addition, the guidance requires the capitalization and amortization of certain costs which were expensed as incurred under legacy GAAP. As discussed in more detail below, the adoption of this new revenue recognition standard will shift revenue among quarters from historical patterns, but is not expected to have a significant year-over-year impact on annual revenue.

Upon adoption of the new revenue standard, the Company recognized significant movement in the quarterly timing of revenue recognized in the Risk and Insurance Services segment. In particular, under the new standard the recognition of revenue for reinsurance broking was accelerated from historical patterns. Estimated revenue from these treaties is recognized largely at the policy effective date at which point control over the services provided by the Company transfers to the client and the client has accepted the services. This resulted in a significant increase in revenue in the first quarter of 2018 compared to the same period in 2017. Prior to the adoption of this standard, revenue related to most reinsurance placements was recognized on the later of billing or effective date as premiums are determined by the primary insurers and attached to the reinsurance treaties. Typically, this resulted in revenue being recognized over a 12 to 18 month period.

The timing of revenue recognition for certain fee based brokerage arrangements will shift among quarters. However, since the vast majority of the Company's fee arrangements involve contracts that cover a single year of services, the Company does not expect there will be a significant change in the amount of revenue recognized in an annual period.

In the Risk and Insurance Services segment, certain pre-placement costs are now deferred and amortized into earnings when revenue from the placement is recognized. These costs were previously expensed as incurred. As such, the Company expects the recognition of costs to shift among quarters.

In the Consulting segment, the adoption of the new revenue standard will not have a significant impact on the timing of revenue recognition in quarterly or annual periods.

In Consulting, the Company incurs implementation costs necessary to facilitate the delivery of the contracted services. The Company has concluded that certain additional implementation costs previously expensed under legacy GAAP will be deferred under the new guidance. In addition, the amortization period for these implementation costs will include the initial contract term plus expected renewals.

The cumulative effect of adopting the standard, net of tax, on January 1, 2018 resulted in an increase to the opening balance of retained earnings of $364 million, with offsetting increases/decreases to other balance sheet accounts, e.g. accounts receivable, other assets and deferred income taxes. The comparative prior period information was not restated and will continue to be reported under the legacy accounting standards that were in effect for those periods.

The impact of adoption of the new revenue standard on the Company's consolidated income statement was as follows (in millions):

	Three Months Ended June 30,									Six Months Ended June 30,
	As Reported			Revenue Standard Impact			Legacy GAAP			As Reported			Revenue Standard Impact			Legacy GAAP
Revenue	$	3,734		$	(24	)	$	3,710		$	7,734		$	(185	)	$	7,549
Expense:
Compensation and Benefits	2,135			(10		)	2,125			4,359			(70		)	4,289
Other Operating Expenses	908			—			908			1,776			—			1,776
Operating Expenses	3,043			(10		)	3,033			6,135			(70		)	6,065
Operating Income	691			(14		)	677			1,599			(115		)	1,484
Other Net Benefit Credits	65			—			65			131			—			131
Interest Income	3			—			3			6			—			6
Interest Expense	(68		)	—			(68		)	(129		)	—			(129		)
Investment Income	28			—			28			28			—			28
Income Before Income Taxes	719			(14		)	705			1,635			(115		)	1,520
Income Tax Expense	183			(4		)	179			403			(30		)	373
Net Income Before Non-Controlling Interests	536			(10		)	526			1,232			(85		)	1,147
Less: Net Income Attributable to Non-Controlling Interests	5			—			5			11			—			11
Net Income Attributable to the Company	$	531		$	(10	)	$	521		$	1,221		$	(85	)	$	1,136

The impact of adoption of the new revenue standard on the Company's consolidated balance sheet was as follows (in millions):

	June 30, 2018
	As Reported			Revenue Standard Impact			Legacy GAAP
ASSETS
Current assets:
Cash and cash equivalents	$	1,036		$	—		$	1,036
Net receivables	4,601			(254		)	4,347
Other current assets	538			(298		)	240
Total current assets	6,175			(552		)	5,623
Goodwill and intangible assets	10,411			—			10,411
Fixed assets, net	698			—			698
Pension related assets	1,808			—			1,808
Deferred tax assets	532			133			665
Other assets	1,535			(230		)	1,305
TOTAL ASSETS	$	21,159		$	(649	)	$	20,510
LIABILITIES AND EQUITY
Current liabilities:
Short-term debt	$	439		$	—		$	439
Accounts payable and accrued liabilities	2,246			(177		)	2,069
Accrued compensation and employee benefits	1,103			—			1,103
Accrued income taxes	216			—			216
Dividends payable	212			—			212
Total current liabilities	4,216			(177		)	4,039
Fiduciary liabilities	5,118			—			5,118
Less - cash and investments held in a fiduciary capacity	(5,118		)	—			(5,118		)
	—			—			—
Long-term debt	5,813			—			5,813
Pension, post-retirement and post-employment benefits	1,768			—			1,768
Liabilities for errors and omissions	303			—			303
Other liabilities	1,262			(23		)	1,239
Total equity	7,797			(449		)	7,348
TOTAL LIABILITIES AND EQUITY	$	21,159		$	(649	)	$	20,510

The impact of adoption of the new revenue standard on the Company's consolidated statement of cash flow was as follows (in millions):

	Six Months Ended June 30, 2018
	As Reported			Revenue Standard Impact			Legacy GAAP
Operating cash flows:
Net income before non-controlling interests	$	1,232		$	(85	)	$	1,147
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization of fixed assets and capitalized software	159			—			159
Amortization of intangible assets	88			—			88
Adjustments and payments related to contingent consideration liability	2			—			2
Provision for deferred income taxes	34			—			34
Gain on investments	(28		)	—			(28		)
Gain on disposition of assets	(1		)	—			(1		)
Share-based compensation expense	99			—			99
Changes in assets and liabilities:
Net receivables	(388		)	186			(202		)
Other current assets	4			(20		)	(16		)
Other assets	(10		)	(26		)	(36		)
Accounts payable and accrued liabilities	30			(55		)	(25		)
Accrued compensation and employee benefits	(614		)	—			(614		)
Accrued income taxes	18			—			18
Contributions to pension excess of expense/credit	(178		)	—			(178		)
Other liabilities	(10		)	—			(10		)
Effect of exchange rate changes	(24		)	—			(24		)
Net cash provided by operations	$	413		$	—		$	413

Theadoption of the revenue recognition standard did not have an impact on the Company's financing or investing cash flows.

Other Standards Adopted Effective January 1, 2018 using the modified retrospective approach

In January 2016, the FASB issued new guidance intended to improve the recognition and measurement of financial instruments. The new guidance requires investments in equity securities (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income; requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (i.e., securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; eliminates the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; and requires a reporting organization to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk (also referred to as "own credit") when the organization has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. The new guidance was effective for public companies for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company holds certain equity investments that under legacy GAAP were previously treated as available for sale securities, whereby the mark-to-market change was recorded to other comprehensive income in its consolidated balance sheet. The Company adopted the new accounting guidance, effective January 1, 2018, recording a cumulative-effect adjustment increase to retained earnings as of the beginning of the period of adoption of $14 million, reflecting the reclassification of cumulative unrealized gains, net of tax as of December 31, 2017 from accumulated other comprehensive income to retained earnings. Therefore, prior periods have not been restated.

In October 2016, the FASB also issued new guidance which requires an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The new guidance eliminates the exception for an intra-entity transfer of an asset other than inventory. The new guidance is effective for public companies for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The new guidance must be applied on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. The Company adopted the new guidance effective January 1, 2018, recording a cumulative-effect adjustment decrease to retained earnings of approximately $14 million as of the beginning of the period of adoption.

The impact on the Company's balance sheet as of January 1, 2018 related to the adoption of the accounting standards using the modified retrospective approach as discussed above is as follows:

			Adjustments
	Balance at December 31, 2017		Revenue Recognition			Financial Instruments			Intra-Entity Transfer			Balance at January 1, 2018
Balance Sheet
Assets
Net Receivables	$	4,133	$	68		$	—		$	—		$	4,201
Other Current Assets	224		318			—			—			542
Other Assets	1,430		226			—			—			1,656
Deferred Tax Assets	669		(103		)	—			(14		)	552
Liabilities
Accounts Payable and Accrued Liabilities	2,083		122			—			—			2,205
Other Liabilities	1,311		23			—			—			1,334
Equity
Other Accumulated Comprehensive Income	—		—			(14		)	—			(14		)
Retained Earnings	$	13,140	$	364		$	14		$	(14	)	$	13,504

Cumulative effect adjustment related to the adoption of the revenue recognition standard

The cumulative effect adjustment recorded to net receivables is primarily related to contingent brokerage revenue and reinsurance revenue placements. Under the new guidance, the Company is required to record an estimate of variable or contingent consideration earlier than under the previous rules. Also under the new guidance, revenue related to most reinsurance placements is accelerated versus previous patterns.

The cumulative effect adjustments also includes the capitalization of costs to fulfill and costs to obtain that are included in other current assets and other assets, respectively. These costs were previously expensed as incurred. The adjustment to accounts payable and accrued liabilities includes deferred revenue related to the timing of fee revenue recognition for fee based arrangements and certain post placement servicing costs, primarily related to reinsurance brokerage costs that were previously expensed as incurred.

Adoption of amended accounting standard using the retrospective application approach

Effective January 1, 2018, the Company adopted new guidance that changes the presentation of net periodic pension cost and net periodic postretirement cost (''net periodic benefit costs"). The new guidance requires employers to report the service cost component of net periodic benefit costs in the same line item as other compensation costs in the income statement. The other components of net periodic benefit costs are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations. The new guidance requires retrospective application for the presentation of the service cost component and the other components of net periodic benefit costs. Accordingly, we have reclassified prior period information in the consolidated results of operations, segment data and related disclosures contained inour management's discussion and analysis and notes to the consolidated financial statements to reflect the retrospective adoption of this standard.

Other accounting standards adopted effective January 1, 2018

In November 2016, the FASB issued new guidance which requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents and amounts generally described as restricted cash or restricted cash equivalents. As a result, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The Company adopted this guidance, which is required to be applied retrospectively to all periods presented, effective January 1, 2018. The adoption of this guidance did not impact the Company's consolidated balance sheets or consolidated statements of cash flows.

In August 2016, the FASB issued new guidance which adds or clarifies guidance on the classification of certain cash receipts and payments in the statement of cash flows, including cash payments for debt prepayments or debt extinguishment costs, contingent consideration payments made after a business combination and distributions received from equity method investees. The Company adopted this guidance effective January 1, 2018. The adoption of this guidance did not impact the Company's consolidated statements of cash flows.

In January 2017, the FASB issued guidance which clarifies the definition of a business in order to assist companies with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The Company adopted this guidance effective January 1, 2018. The adoption of this standard did not have an impact on the Company's financial position or results of operations.

New Accounting Pronouncements Not Yet Adopted

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 guidance is effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company does not expect the adoption of this standard to have a material impact on its financial position or results of operations.

In February 2016, the FASB issued new guidance intended to improve financial reporting for leases. Under the new guidance, a lessee will be required to recognize assets and liabilities for leases with lease terms of more than 12 months. Consistent with current GAAP, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a financing or operating lease. However, unlike current GAAP, which requires that only capital leases be recognized on the balance sheet, the new guidance requires that both types of leases be recognized on the balance sheet. The new guidance will require additional disclosures to help investors and other financial statement users better understand the amount, timing, and uncertainty of cash flows arising from leases. These disclosures include qualitative and quantitative requirements, and additional information about the amounts recorded in the financial statements. The accounting by organizations that own the assets ("lessor") leased by the lessee will remain largely unchanged from current GAAP. However, the guidance contains targeted improvements that are intended to align, where necessary, lessor accounting with the lessee accounting model. The new guidance on leases is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early application is permitted. The Company is currently evaluating the impact the adoption of the guidance will have on its financial position and results of operations, but expects material "right of use" assets and lease liabilities to be recorded on its consolidated balance sheets.

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Principles of Consolidation and Other Matters (Policies)

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Accounting

The consolidated financial statements included herein have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission. While certain information and footnote 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 for interim filings, the Company believes that the information and disclosures presented are adequate to make such information and disclosures not misleading.

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.

Investments

The caption "Investment income" 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 debt 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 certain equity investments, that under legacy Generally Accepted Accounting Principles, were previously accounted as available for sale securities, whereby the mark-to-market change was recorded to other comprehensive income in its consolidated balance sheet. As discussed in Note 17, effective January 1, 2018, the Company adopted new accounting guidance that requires equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. The Company recorded a cumulative-effect adjustment that increased retained earnings as of the beginning of the period of adoption of $14 million, reflecting the reclassification of cumulative unrealized gains, net of tax as of December 31, 2017 from accumulated other comprehensive income to retained earnings. Prior periods have not been restated.

The Company holds investments in certain private equity funds that are accounted for under 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 second quarter of 2018 was 25.6% compared with 28.6% in the second quarter of 2017. The effective tax rates for the first six months of 2018 and 2017 were 24.7% and 25.9%. The rate in the first half of 2018 reflects ongoing impacts of the Tax Cuts and Jobs Act (the "TCJA"), primarily the reduced 21% U.S. statutory rate and certain tax planning benefits, largely offset by higher estimated costs from the new territorial system, greater disallowance of compensation and entertainment deductions and a decrease in excess tax benefits related to share-based compensation. The tax rates in 2017 reflect foreign operations taxed at rates below the 35% U.S. statutory tax rate, including the effect of repatriation. The tax rates in both periods reflect the impact of discrete tax matters, tax legislation and nontaxable adjustments to contingent acquisition consideration.

As a result of TCJA, two discrete provisional charges were recorded in the fourth quarter of 2017. The transition to the new territorial tax system resulted in a transition tax payable over eight years on undistributed earnings of non-U.S. subsidiaries. This mandatory taxation of accumulated foreign earnings substantially changed the economic considerations of continued permanent investment of those accumulated earnings, a key component of the Company's global capital strategy. As a result of the transition tax, the Company anticipates repatriating the majority of the accumulated earnings that it previously intended to permanently invest. A charge of $240 million was recorded in the fourth quarter of 2017 as a provisional estimate of the transition tax and ancillary effects.

The provisional estimate of transition tax includes state taxes and foreign withholding taxes related to the change in the Company's indefinite reinvestment assertion with respect to its pre-2018 foreign earnings. The Company previously considered most unremitted earnings of its non-U.S. subsidiaries, except amounts repatriated in the year earned, to be permanently reinvested and, accordingly, recorded no deferred U.S. income taxes on such earnings. The Company has initially analyzed its global capital requirements and potential tax liabilities attributable to repatriation. The Company estimates that it will repatriate $3.4 billion that was previously considered indefinitely invested. Included in the $240 million charge in 2017 is a $53 million provisional estimate for withholding and state income taxes.

In addition, reducing the U.S. corporate tax rate from 35% to 21% and the change in deductibility of certain compensation awards to certain executive officers of the Company effective on January 1, 2018, resulted in a net charge of $220 million in the fourth quarter of 2017 to reduce the value of our U.S. deferred tax assets and liabilities. Adjustments during the first half of 2018 to provisional estimates of transition taxes and U.S. deferred tax assets and liabilities increased income tax expense by $3 million. These estimates may be further adjusted during 2018 when the Company has finalized its analysis of all the relevant information.

In December of 2017, the SEC issued Staff Accounting Bulletin 118 ("SAB 118"), establishing a one-year measurement period to complete the accounting for the income tax effects of the TCJA. SAB 118 anticipates three alternative states of completion at the end of the reporting period of accounting for these effects: (1) the tax accounting work has been completed with respect to an item; (2) a provisional amount has been recognized because a reasonable estimate was possible, or (3) a reasonable estimate cannot be provided. The Company believes its analysis of the TCJA to date provides an appropriate basis to record a provisional estimate. Our provisional estimates include the effects of the deemed repatriation tax and the Company's position with respect to permanently reinvested earnings, the impact of the Global Intangible Low Taxed Income ("GILTI") provision and the remeasurement of U.S. deferred tax based on estimated enactment-date deferred tax balances, which may be adjusted in 2018 when the 2017 tax return is filed. TCJA’s transition tax requires detailed calculations of current and accumulated taxable earnings at the level of each foreign subsidiary, computed in functional currency at the greater of two alternative measurement dates and converted into U.S. dollars. In preparing its 2017 U.S. federal return the Company is performing these calculations for approximately seven hundred foreign subsidiaries. In the third quarter management expects to update its estimate of the transition tax, its global permanent investment strategy, and the impact on U.S. deferred tax assets from the change in tax rate. However, given the significant complexity of the TCJA and still-anticipated guidance from the U.S. Treasury about its implementation, these estimates may be further adjusted during the fourth quarter.

The Company is routinely examined by tax authorities in the jurisdictions in which it has significant operations. The Company regularly considers the likelihood of assessments in each of the taxing jurisdictions resulting from examinations. When evaluating the potential imposition of penalties, the Company considers a number of relevant factors under penalty statutes, including appropriate disclosure of the tax return position, the existence of legal authority supporting the Company's position and reliance on the opinion of professional tax advisors.

The Company reports a liability for unrecognized tax benefits resulting from uncertain tax positions taken or expected to be taken in tax returns.

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).

The Company does not have any assets or liabilities that are measured using Level 2 inputs.

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.

Liabilities measured using Level 3 inputs include liabilities for contingent purchase consideration.

Valuation Techniques

Equity Securities, Money Market 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 funds are valued using a valuation technique that results in price per share at $1.00.

Contingent Purchase Consideration Liability – Level 3

Purchase consideration for some acquisitions made by the Company includes contingent consideration arrangements. These arrangements typically provide for the payment of additional consideration if earnings or revenue targets are met over periods from two to four years. The fair value of the contingent purchase consideration 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 entities.

New Accounting Pronouncements

New Accounting Guidance

New Accounting Pronouncements Effective January 1, 2018:

The following new accounting standards were adopted using a modified retrospective approach through a cumulative-effect adjustment to retained earnings as of January 1, 2018:

New Revenue Recognition Standard

In May 2014, the FASB issued new accounting guidance related to revenue from contracts with customers. The core principle of the 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 Company adopted the new guidance effective January 1, 2018, using the modified retrospective method, which applies the new guidance beginning with the year of adoption, with the cumulative effect of initially applying the guidance recognized as an adjustment to retained earnings at January 1, 2018. The Company elected to apply the modified retrospective method to all contracts.

The guidance includes requirements to estimate variable or contingent consideration to be received, which will result in revenue being recognized earlier than under legacy GAAP. In addition, the guidance requires the capitalization and amortization of certain costs which were expensed as incurred under legacy GAAP. As discussed in more detail below, the adoption of this new revenue recognition standard will shift revenue among quarters from historical patterns, but is not expected to have a significant year-over-year impact on annual revenue.

Upon adoption of the new revenue standard, the Company recognized significant movement in the quarterly timing of revenue recognized in the Risk and Insurance Services segment. In particular, under the new standard the recognition of revenue for reinsurance broking was accelerated from historical patterns. Estimated revenue from these treaties is recognized largely at the policy effective date at which point control over the services provided by the Company transfers to the client and the client has accepted the services. This resulted in a significant increase in revenue in the first quarter of 2018 compared to the same period in 2017. Prior to the adoption of this standard, revenue related to most reinsurance placements was recognized on the later of billing or effective date as premiums are determined by the primary insurers and attached to the reinsurance treaties. Typically, this resulted in revenue being recognized over a 12 to 18 month period.

The timing of revenue recognition for certain fee based brokerage arrangements will shift among quarters. However, since the vast majority of the Company's fee arrangements involve contracts that cover a single year of services, the Company does not expect there will be a significant change in the amount of revenue recognized in an annual period.

In the Risk and Insurance Services segment, certain pre-placement costs are now deferred and amortized into earnings when revenue from the placement is recognized. These costs were previously expensed as incurred. As such, the Company expects the recognition of costs to shift among quarters.

In the Consulting segment, the adoption of the new revenue standard will not have a significant impact on the timing of revenue recognition in quarterly or annual periods.

In Consulting, the Company incurs implementation costs necessary to facilitate the delivery of the contracted services. The Company has concluded that certain additional implementation costs previously expensed under legacy GAAP will be deferred under the new guidance. In addition, the amortization period for these implementation costs will include the initial contract term plus expected renewals.

The cumulative effect of adopting the standard, net of tax, on January 1, 2018 resulted in an increase to the opening balance of retained earnings of $364 million, with offsetting increases/decreases to other balance sheet accounts, e.g. accounts receivable, other assets and deferred income taxes. The comparative prior period information was not restated and will continue to be reported under the legacy accounting standards that were in effect for those periods.

The impact of adoption of the new revenue standard on the Company's consolidated income statement was as follows (in millions):

	Three Months Ended June 30,									Six Months Ended June 30,
	As Reported			Revenue Standard Impact			Legacy GAAP			As Reported			Revenue Standard Impact			Legacy GAAP
Revenue	$	3,734		$	(24	)	$	3,710		$	7,734		$	(185	)	$	7,549
Expense:
Compensation and Benefits	2,135			(10		)	2,125			4,359			(70		)	4,289
Other Operating Expenses	908			—			908			1,776			—			1,776
Operating Expenses	3,043			(10		)	3,033			6,135			(70		)	6,065
Operating Income	691			(14		)	677			1,599			(115		)	1,484
Other Net Benefit Credits	65			—			65			131			—			131
Interest Income	3			—			3			6			—			6
Interest Expense	(68		)	—			(68		)	(129		)	—			(129		)
Investment Income	28			—			28			28			—			28
Income Before Income Taxes	719			(14		)	705			1,635			(115		)	1,520
Income Tax Expense	183			(4		)	179			403			(30		)	373
Net Income Before Non-Controlling Interests	536			(10		)	526			1,232			(85		)	1,147
Less: Net Income Attributable to Non-Controlling Interests	5			—			5			11			—			11
Net Income Attributable to the Company	$	531		$	(10	)	$	521		$	1,221		$	(85	)	$	1,136

The impact of adoption of the new revenue standard on the Company's consolidated balance sheet was as follows (in millions):

	June 30, 2018
	As Reported			Revenue Standard Impact			Legacy GAAP
ASSETS
Current assets:
Cash and cash equivalents	$	1,036		$	—		$	1,036
Net receivables	4,601			(254		)	4,347
Other current assets	538			(298		)	240
Total current assets	6,175			(552		)	5,623
Goodwill and intangible assets	10,411			—			10,411
Fixed assets, net	698			—			698
Pension related assets	1,808			—			1,808
Deferred tax assets	532			133			665
Other assets	1,535			(230		)	1,305
TOTAL ASSETS	$	21,159		$	(649	)	$	20,510
LIABILITIES AND EQUITY
Current liabilities:
Short-term debt	$	439		$	—		$	439
Accounts payable and accrued liabilities	2,246			(177		)	2,069
Accrued compensation and employee benefits	1,103			—			1,103
Accrued income taxes	216			—			216
Dividends payable	212			—			212
Total current liabilities	4,216			(177		)	4,039
Fiduciary liabilities	5,118			—			5,118
Less - cash and investments held in a fiduciary capacity	(5,118		)	—			(5,118		)
	—			—			—
Long-term debt	5,813			—			5,813
Pension, post-retirement and post-employment benefits	1,768			—			1,768
Liabilities for errors and omissions	303			—			303
Other liabilities	1,262			(23		)	1,239
Total equity	7,797			(449		)	7,348
TOTAL LIABILITIES AND EQUITY	$	21,159		$	(649	)	$	20,510

The impact of adoption of the new revenue standard on the Company's consolidated statement of cash flow was as follows (in millions):

	Six Months Ended June 30, 2018
	As Reported			Revenue Standard Impact			Legacy GAAP
Operating cash flows:
Net income before non-controlling interests	$	1,232		$	(85	)	$	1,147
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization of fixed assets and capitalized software	159			—			159
Amortization of intangible assets	88			—			88
Adjustments and payments related to contingent consideration liability	2			—			2
Provision for deferred income taxes	34			—			34
Gain on investments	(28		)	—			(28		)
Gain on disposition of assets	(1		)	—			(1		)
Share-based compensation expense	99			—			99
Changes in assets and liabilities:
Net receivables	(388		)	186			(202		)
Other current assets	4			(20		)	(16		)
Other assets	(10		)	(26		)	(36		)
Accounts payable and accrued liabilities	30			(55		)	(25		)
Accrued compensation and employee benefits	(614		)	—			(614		)
Accrued income taxes	18			—			18
Contributions to pension excess of expense/credit	(178		)	—			(178		)
Other liabilities	(10		)	—			(10		)
Effect of exchange rate changes	(24		)	—			(24		)
Net cash provided by operations	$	413		$	—		$	413

Theadoption of the revenue recognition standard did not have an impact on the Company's financing or investing cash flows.

Other Standards Adopted Effective January 1, 2018 using the modified retrospective approach

In January 2016, the FASB issued new guidance intended to improve the recognition and measurement of financial instruments. The new guidance requires investments in equity securities (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income; requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (i.e., securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; eliminates the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; and requires a reporting organization to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk (also referred to as "own credit") when the organization has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. The new guidance was effective for public companies for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company holds certain equity investments that under legacy GAAP were previously treated as available for sale securities, whereby the mark-to-market change was recorded to other comprehensive income in its consolidated balance sheet. The Company adopted the new accounting guidance, effective January 1, 2018, recording a cumulative-effect adjustment increase to retained earnings as of the beginning of the period of adoption of $14 million, reflecting the reclassification of cumulative unrealized gains, net of tax as of December 31, 2017 from accumulated other comprehensive income to retained earnings. Therefore, prior periods have not been restated.

In October 2016, the FASB also issued new guidance which requires an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The new guidance eliminates the exception for an intra-entity transfer of an asset other than inventory. The new guidance is effective for public companies for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The new guidance must be applied on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. The Company adopted the new guidance effective January 1, 2018, recording a cumulative-effect adjustment decrease to retained earnings of approximately $14 million as of the beginning of the period of adoption.

The impact on the Company's balance sheet as of January 1, 2018 related to the adoption of the accounting standards using the modified retrospective approach as discussed above is as follows:

			Adjustments
	Balance at December 31, 2017		Revenue Recognition			Financial Instruments			Intra-Entity Transfer			Balance at January 1, 2018
Balance Sheet
Assets
Net Receivables	$	4,133	$	68		$	—		$	—		$	4,201
Other Current Assets	224		318			—			—			542
Other Assets	1,430		226			—			—			1,656
Deferred Tax Assets	669		(103		)	—			(14		)	552
Liabilities
Accounts Payable and Accrued Liabilities	2,083		122			—			—			2,205
Other Liabilities	1,311		23			—			—			1,334
Equity
Other Accumulated Comprehensive Income	—		—			(14		)	—			(14		)
Retained Earnings	$	13,140	$	364		$	14		$	(14	)	$	13,504

Cumulative effect adjustment related to the adoption of the revenue recognition standard

The cumulative effect adjustment recorded to net receivables is primarily related to contingent brokerage revenue and reinsurance revenue placements. Under the new guidance, the Company is required to record an estimate of variable or contingent consideration earlier than under the previous rules. Also under the new guidance, revenue related to most reinsurance placements is accelerated versus previous patterns.

The cumulative effect adjustments also includes the capitalization of costs to fulfill and costs to obtain that are included in other current assets and other assets, respectively. These costs were previously expensed as incurred. The adjustment to accounts payable and accrued liabilities includes deferred revenue related to the timing of fee revenue recognition for fee based arrangements and certain post placement servicing costs, primarily related to reinsurance brokerage costs that were previously expensed as incurred.

Adoption of amended accounting standard using the retrospective application approach

Effective January 1, 2018, the Company adopted new guidance that changes the presentation of net periodic pension cost and net periodic postretirement cost (''net periodic benefit costs"). The new guidance requires employers to report the service cost component of net periodic benefit costs in the same line item as other compensation costs in the income statement. The other components of net periodic benefit costs are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations. The new guidance requires retrospective application for the presentation of the service cost component and the other components of net periodic benefit costs. Accordingly, we have reclassified prior period information in the consolidated results of operations, segment data and related disclosures contained inour management's discussion and analysis and notes to the consolidated financial statements to reflect the retrospective adoption of this standard.

Other accounting standards adopted effective January 1, 2018

In November 2016, the FASB issued new guidance which requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents and amounts generally described as restricted cash or restricted cash equivalents. As a result, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The Company adopted this guidance, which is required to be applied retrospectively to all periods presented, effective January 1, 2018. The adoption of this guidance did not impact the Company's consolidated balance sheets or consolidated statements of cash flows.

In August 2016, the FASB issued new guidance which adds or clarifies guidance on the classification of certain cash receipts and payments in the statement of cash flows, including cash payments for debt prepayments or debt extinguishment costs, contingent consideration payments made after a business combination and distributions received from equity method investees. The Company adopted this guidance effective January 1, 2018. The adoption of this guidance did not impact the Company's consolidated statements of cash flows.

In January 2017, the FASB issued guidance which clarifies the definition of a business in order to assist companies with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The Company adopted this guidance effective January 1, 2018. The adoption of this standard did not have an impact on the Company's financial position or results of operations.

New Accounting Pronouncements Not Yet Adopted

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 guidance is effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company does not expect the adoption of this standard to have a material impact on its financial position or results of operations.

In February 2016, the FASB issued new guidance intended to improve financial reporting for leases. Under the new guidance, a lessee will be required to recognize assets and liabilities for leases with lease terms of more than 12 months. Consistent with current GAAP, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a financing or operating lease. However, unlike current GAAP, which requires that only capital leases be recognized on the balance sheet, the new guidance requires that both types of leases be recognized on the balance sheet. The new guidance will require additional disclosures to help investors and other financial statement users better understand the amount, timing, and uncertainty of cash flows arising from leases. These disclosures include qualitative and quantitative requirements, and additional information about the amounts recorded in the financial statements. The accounting by organizations that own the assets ("lessor") leased by the lessee will remain largely unchanged from current GAAP. However, the guidance contains targeted improvements that are intended to align, where necessary, lessor accounting with the lessee accounting model. The new guidance on leases is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early application is permitted. The Company is currently evaluating the impact the adoption of the guidance will have on its financial position and results of operations, but expects material "right of use" assets and lease liabilities to be recorded on its consolidated balance sheets.

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Revenue (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

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

	Three Months Ended June 30,		Six Months Ended June 30,
	2018		2018
Marsh:
EMEA	$	526	$	1,169
Asia Pacific	183		347
Latin America	99		183
Total International	808		1,699
U.S./Canada	941		1,744
Total Marsh	1,749		3,443
Guy Carpenter	332		969
Subtotal	2,081		4,412
Fiduciary interest income	15		28
Total Risk and Insurance Services	$	2,096	$	4,440
Mercer:
Defined Benefit Consulting & Administration	$	320	$	659
Investment Management & Related Services	232		458
Total Wealth	552		1,117
Health	429		871
Career	177		341
Total Mercer	1,158		2,329
Oliver Wyman	492		989
Total Consulting	$	1,650	$	3,318

Contract with Customer, Asset and Liability

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

(In millions)	January 1, 2018		June 30, 2018
Contract Assets	$	128	$	178
Contract Liabilities	$	583	$	647

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Per Share Data (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Diluted EPS Calculation Continuing Operations

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 June 30,				Six Months Ended June 30,
(In millions, except per share amounts)	2018		2017		2018		2017
Net income before non-controlling interests	$	536	$	507	$	1,232	$	1,085
Less: Net income attributable to non-controlling interests	5		6		11		15
Net income attributable to the Company	$	531	$	501	$	1,221	$	1,070
Basic weighted average common shares outstanding	507		514		507		514
Dilutive effect of potentially issuable common shares	5		6		6		7
Diluted weighted average common shares outstanding	512		520		513		521
Average stock price used to calculate common stock equivalents	$	81.64	$	75.41	$	82.24	$	73.36

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

6 Months Ended

Jun. 30, 2018

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 six-month periods ended June 30, 2018 and 2017.

(In millions)	2018			2017
Assets acquired, excluding cash	$	204		$	576
Liabilities assumed	(28		)	(74		)
Contingent/deferred purchase consideration	(32		)	(90		)
Net cash outflow for current year acquisitions	$	144		$	412

(In millions)	2018		2017
Interest paid	$	107	$	92
Income taxes paid, net of refunds	$	349	$	297

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Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2018

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 six-month period ended June 30, 2018 and 2017, including amounts reclassified out of AOCI, are as follows:

(In millions)	Unrealized Investment Gains (Losses)		Pension/Post-Retirement Plans Gains (Losses)			Foreign Currency Translation Gains (Losses)			Total Gains (Losses)
Balance as of April 1, 2018	$	—	$	(2,963	)	$	(942	)	$	(3,905	)
Other comprehensive income (loss) before reclassifications	—		129			(516		)	(387		)
Amounts reclassified from accumulated other comprehensive income	—		27			—			27
Net current period other comprehensive income (loss)	—		156			(516		)	(360		)
Balance as of June 30, 2018	$	—	$	(2,807	)	$	(1,458	)	$	(4,265	)

(In millions)	Unrealized Investment Gains		Pension/Post-Retirement Plans Gains (Losses)			Foreign Currency Translation Gains (Losses)			Total Gains (Losses)
Balance as of April 1, 2017	$	16	$	(3,208	)	$	(1,645	)	$	(4,837	)
Other comprehensive income (loss) before reclassifications	14		(40		)	289			263
Amounts reclassified from accumulated other comprehensive income	—		33			—			33
Net current period other comprehensive income (loss)	14		(7		)	289			296
Balance as of June 30, 2017	$	30	$	(3,215	)	$	(1,356	)	$	(4,541	)

(In millions)	Unrealized Investment Gains (Losses)			Pension/Post-Retirement Plans Gains (Losses)			Foreign Currency Translation Gains (Losses)			Total Gains (Losses)
Balance as of December 31, 2017	$	14		$	(2,892	)	$	(1,165	)	$	(4,043	)
Cumulative effect of amended accounting standard	(14		)	—			—			(14		)
Other comprehensive income (loss) before reclassifications	—			29			(293		)	(264		)
Amounts reclassified from accumulated other comprehensive income	—			56			—			56
Net current period other comprehensive income (loss)	—			85			(293		)	(208		)
Balance as of June 30, 2018	$	—		$	(2,807	)	$	(1,458	)	$	(4,265	)

(In millions)	Unrealized Investment Gains		Pension/Post-Retirement Plans Gains (Losses)			Foreign Currency Translation Gains (Losses)			Total Gains (Losses)
Balance as of December 31, 2016	$	19	$	(3,232	)	$	(1,880	)	$	(5,093	)
Other comprehensive income (loss) before reclassifications	11		(46		)	524			489
Amounts reclassified from accumulated other comprehensive income	—		63			—			63
Net current period other comprehensive income (loss)	11		17			524			552
Balance as of June 30, 2017	$	30	$	(3,215	)	$	(1,356	)	$	(4,541	)

Schedule of Components of Comprehensive Income (Loss)

The components of other comprehensive income (loss) for the three and six-month period ended June 30, 2018 and 2017 are as follows:

Three Months Ended June 30,	2018									2017
(In millions)	Pre-Tax			Tax (Credit)			Net of Tax			Pre-Tax			Tax (Credit)			Net of Tax
Foreign currency translation adjustments	$	(529	)	$	(13	)	$	(516	)	$	290		$	1		$	289
Unrealized investment gains	—			—			—			24			10			14
Pension/post-retirement plans:
Amortization of losses included in net periodic pension cost:
Prior service credits (a)	(1		)	—			(1		)	—			—			—
Net actuarial losses (a)	37			9			28			42			9			33
Subtotal	36			9			27			42			9			33
Effect of remeasurement	—			—			—			—			1			(1		)
Foreign currency translation adjustments	156			27			129			(47		)	(8		)	(39		)
Pension/post-retirement plans gains (losses)	192			36			156			(5		)	2			(7		)
Other comprehensive (loss) income	$	(337	)	$	23		$	(360	)	$	309		$	13		$	296
(a) Components of net periodic pension cost are included in compensation and benefits in the consolidated statements of income. Income tax credits on prior service costs and net actuarial losses are included in income tax expense.

Six Months Ended June 30,	2018									2017
(In millions)	Pre-Tax			Tax (Credit)			Net of Tax			Pre-Tax			Tax (Credit)			Net of Tax
Foreign currency translation adjustments	$	(301	)	$	(8	)	$	(293	)	$	525		$	1		$	524
Unrealized investment gains	—			—			—			19			8			11
Pension/post-retirement plans:
Amortization of losses included in net periodic pension cost:
Prior service credits (a)	(2		)	—			(2		)	—			—			—
Net actuarial losses (a)	74			16			58			82			19			63
Subtotal	72			16			56			82			19			63
Effect of remeasurement	—			—			—			9			3			6
Effect of curtailment	—			—			—			(1		)	—			(1		)
Effect of settlement	—			—			—			1			—			1
Foreign currency translation adjustments	36			7			29			(62		)	(11		)	(51		)
Other	—			—			—			(1		)	—			(1		)
Pension/post-retirement plans gains	108			23			85			28			11			17
Other comprehensive (loss) income	$	(193	)	$	15		$	(208	)	$	572		$	20		$	552
(a) Components of net periodic pension cost are included in other net benefit credits in the consolidated statements of income. Tax on prior service costs and net actuarial losses is included in income tax expense.

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Acquisitions (Tables)

6 Months Ended

Jun. 30, 2018

Business Combinations [Abstract]

Schedule For Allocation of Acquisition Costs

The following table presents the preliminary allocation of the acquisition cost to the assets acquired and liabilities assumed during 2018 based on their fair values:

For the Six Months Ended June 30, 2018
(In millions)
Cash	$	160
Estimated fair value of deferred/contingent consideration	32
Total Consideration	$	192
Allocation of purchase price:
Cash and cash equivalents	$	16
Accounts receivable, net	12
Property, plant, and equipment	3
Other intangible assets	73
Goodwill	116
Total assets acquired	220
Current liabilities	10
Other liabilities	18
Total liabilities assumed	28
Net assets acquired	$	192

Schedule of Acquired Finite-Lived Intangible Assets by Major Class

The following chart provides information about other intangible assets acquired during 2018:

	Amount		Weighted Average Amortization Period
Client relationships	$	72	9 years
Other	1		4 years
	$	73

Pro-Forma Information

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 June 30,				Six Months Ended June 30,
(In millions, except per share figures)	2018		2017		2018		2017
Revenue	$	3,748	$	3,539	$	7,770	$	7,098
Net income attributable to the Company	$	532	$	503	$	1,225	$	1,072
Basic net income per share attributable to the Company	$	1.05	$	0.98	$	2.41	$	2.08
Diluted net income per share attributable to the Company	$	1.04	$	0.97	$	2.39	$	2.06

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Goodwill and Other Intangibles (Tables)

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the Carrying Amount of Goodwill

Changes in the carrying amount of goodwill are as follows:

June 30,
(In millions)	2018			2017
Balance as of January 1,	$	9,089		$	8,369
Goodwill acquired	116			370
Other adjustments(a)	(28		)	82
Balance at June 30,	$	9,177		$	8,821

Amortized Intangible Assets

The gross cost and accumulated amortization at June 30, 2018 and December 31, 2017 are as follows:

	June 30, 2018						December 31, 2017
(In millions)	Gross Cost		Accumulated Amortization		Net Carrying Amount		Gross Cost		Accumulated Amortization		Net Carrying Amount
Client Relationships	$	1,711	$	580	$	1,131	$	1,672	$	518	$	1,154
Other (a)	237		134		103		234		114		120
Amortized intangibles	$	1,948	$	714	$	1,234	$	1,906	$	632	$	1,274

^(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
2018 (excludes amortization through June 30, 2018)	$	94
2019	173
2020	154
2021	143
2022	132
Subsequent years	538
	$	1,234

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

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 June 30, 2018 and December 31, 2017.

	Identical Assets (Level 1)				Observable Inputs (Level 2)				Unobservable Inputs (Level 3)				Total
(In millions)	06/30/18		12/31/17		06/30/18		12/31/17		06/30/18		12/31/17		06/30/18		12/31/17
Assets:
Financial instruments owned:
Exchange traded equity securities(a)	$	99	$	81	$	—	$	—	$	—	$	—	$	99	$	81
Mutual funds(a)	144		158		—		—		—		—		144		158
Money market funds(b)	33		143		—		—		—		—		33		143
Total assets measured at fair value	$	276	$	382	$	—	$	—	$	—	$	—	$	276	$	382
Fiduciary Assets:
Money market funds	$	129	$	111	$	—	$	—	$	—	$	—	$	129	$	111
Total fiduciary assets measured at fair value	$	129	$	111	$	—	$	—	$	—	$	—	$	129	$	111
Liabilities:
Contingent purchase consideration liability(c)	$	—	$	—	$	—	$	—	$	185	$	189	$	185	$	189
Total liabilities measured at fair value	$	—	$	—	$	—	$	—	$	185	$	189	$	185	$	189

^(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 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 table below sets forth a summary of the changes in fair value of the Company’s Level 3 liabilities for the three and six month periods ending June 30, 2018 and 2017 that represent contingent consideration related to acquisitions:

	Three Months Ended June 30,						Six Months Ended June 30,
(In millions)	2018			2017			2018			2017
Balance at beginning of period,	$	161		$	247		$	189		$	241
Additions	20			—			26			34
Payments	(1		)	(53		)	(41		)	(65		)
Revaluation Impact	6			8			11			(8		)
Other (a)	(1		)	1			—			1
Balance at June 30,	$	185		$	203		$	185		$	203

^(a) Primarily reflects the impact of foreign exchange.

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Retirement Benefits (Tables)

6 Months Ended

Jun. 30, 2018

Defined Benefit Plan [Abstract]

Schedule of Net Benefit Costs

The components of the net periodic benefit cost for defined benefit and other post-retirement plans are as follows:

Combined U.S. and significant non-U.S. plans	Pension Benefits						Post-retirement Benefits
For the Three Months Ended June 30,
(In millions)	2018			2017			2018			2017
Service cost	$	7		$	19		$	—		$	—
Interest cost	117			124			1			1
Expected return on plan assets	(218		)	(230		)	—			—
Amortization of prior service cost	(1		)	(1		)	(1		)	—
Recognized actuarial loss	37			43			—			—
Net periodic benefit (credit) cost	$	(58	)	$	(45	)	$	—		$	1
Combined U.S. and significant non-U.S. plans	Pension Benefits						Post-retirement Benefits
For the Six Months Ended June 30,
(In millions)	2018			2017			2018			2017
Service cost	$	17		$	37		$	—		$	—
Interest cost	235			246			2			2
Expected return on plan assets	(439		)	(454		)	—			—
Amortization of prior service (credit) cost	(1		)	(1		)	(2		)	1
Recognized actuarial loss	74			83			—			—
Net periodic benefit (credit) cost	$	(114	)	$	(89	)	$	—		$	3
Curtailment gain	—			(1		)	—			—
Settlement loss	—			1			—			—
Total (credit) cost	$	(114	)	$	(89	)	$	—		$	3

As discussed in Note 17, effective January 1, 2018, the Company adopted the new guidance that changes the presentation of net periodic pension cost and net periodic postretirement cost (''net periodic benefit costs"). The new guidance requires employers to report the service cost component of net periodic benefit costs in the same line item as other compensation costs in the income statement. The other components of net periodic benefit costs are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations. The new guidance requires retrospective application for the presentation of the service cost component and the other components of net periodic benefit costs. Accordingly, the Company has reclassified prior period information in the following chart to conform with the current year's presentation:

Amounts Recorded in the Consolidated Statement of Income
Combined U.S. and significant non-U.S. plans	Pension Benefits						Post-retirement Benefits
For the Three Months Ended June 30,
(In millions)	2018			2017			2018		2017
Compensation and benefits expense (Operating income)	$	7		$	19		$	—	$	—
Other net benefit credits	(65		)	(64		)	—		1
Total (credit) cost	$	(58	)	$	(45	)	$	—	$	1

Amounts Recorded in the Consolidated Statement of Income
Combined U.S. and significant non-U.S. plans	Pension Benefits						Post-retirement Benefits
For the Six Months Ended June 30,
(In millions)	2018			2017			2018		2017
Compensation and benefits expense (Operating income)	$	17		$	37		$	—	$	—
Other net benefit credits	(131		)	(126		)	—		3
Total (credit) cost	$	(114	)	$	(89	)	$	—	$	3

U.S. Plans only	Pension Benefits						Post-retirement Benefits
For the Three Months Ended June 30,
(In millions)	2018			2017			2018			2017
Service cost	$	—		$	—		$	—		$	—
Interest cost	59			66			1			1
Expected return on plan assets	(90		)	(90		)	—			—
Amortization of prior service (credit) cost	—			—			(1		)	1
Recognized actuarial loss (gain)	14			10			—			(1		)
Net periodic benefit (credit) cost	$	(17	)	$	(14	)	$	—		$	1

U.S. Plans only	Pension Benefits						Post-retirement Benefits
For the Six Months Ended June 30,
(In millions)	2018			2017			2018			2017
Service cost	$	—		$	—		$	—		$	—
Interest cost	118			132			1			1
Expected return on plan assets	(179		)	(179		)	—			—
Amortization of prior service (credit) cost	—			—			(1		)	2
Recognized actuarial loss (gain)	27			19			—			(1		)
Net periodic benefit (credit) cost	$	(34	)	$	(28	)	$	—		$	2

Significant non-U.S. plans only	Pension Benefits						Post-retirement Benefits
For the Three Months Ended June 30,
(In millions)	2018			2017			2018		2017
Service cost	$	7		$	19		$	—	$	—
Interest cost	58			58			—		—
Expected return on plan assets	(128		)	(140		)	—		—
Amortization of prior service cost	(1		)	(1		)	—		(1		)
Recognized actuarial loss	23			33			—		1
Net periodic benefit (credit) cost	$	(41	)	$	(31	)	$	—	$	—

Significant non-U.S. plans only	Pension Benefits						Post-retirement Benefits
For the Six Months Ended June 30,
(In millions)	2018			2017			2018			2017
Service cost	$	17		$	37		$	—		$	—
Interest cost	117			114			1			1
Expected return on plan assets	(260		)	(275		)	—			—
Amortization of prior service credit	(1		)	(1		)	(1		)	(1		)
Recognized actuarial loss	47			64			—			1
Net periodic benefit (credit) cost	$	(80	)	$	(61	)	$	—		$	1
Curtailment gain	—			(1		)	—			—
Settlement loss	—			1			—			—
Total (credit) cost	$	(80	)	$	(61	)	$	—		$	1

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				Post-retirement Benefits
June 30,	2018		2017		2018		2017
Weighted average assumptions:
Expected return on plan assets	5.83	%	6.64	%	—		—
Discount Rate	3.07	%	3.40	%	3.21	%	3.64	%
Rate of compensation increase	1.73	%	1.77	%	—		—

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Debt (Tables)

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Schedule of Outstanding Debt

The Company’s outstanding debt is as follows:

(In millions)	June 30, 2018		December 31, 2017
Short-term:
Commercial paper	$	175	$	—
Current portion of long-term debt	264		262
	439		262
Long-term:
Senior notes – 2.55% due 2018	250		250
Senior notes – 2.35% due 2019	299		299
Senior notes – 2.35% due 2020	499		498
Senior notes – 4.80% due 2021	498		498
Senior notes – 2.75% due 2022	497		496
Senior notes – 3.30% due 2023	348		348
Senior notes – 4.05% due 2023	248		248
Senior notes – 3.50% due 2024	597		596
Senior notes – 3.50% due 2025	496		496
Senior notes – 3.75% due 2026	596		596
Senior notes – 5.875% due 2033	297		297
Senior notes – 4.35% due 2047	492		492
Senior notes – 4.20% due 2048	592		—
Mortgage – 5.70% due 2035	364		370
Other	4		3
	6,077		5,487
Less current portion	264		262
	$	5,813	$	5,225

Estimated Fair Value Of Significant Financial Instruments

The estimated fair value of the Company’s short-term and long-term debt is provided below. Certain estimates and judgments were required to develop the fair value amounts. The fair value amounts shown below 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.

	June 30, 2018				December 31, 2017
(In millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Short-term debt	$	439	$	440	$	262	$	264
Long-term debt	$	5,813	$	5,826	$	5,225	$	5,444

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Restructuring Costs (Tables)

6 Months Ended

Jun. 30, 2018

Restructuring and Related Activities [Abstract]

Restructuring Activities

Details of the restructuring activity from January 1, 2017 through June 30, 2018, which includes liabilities from actions prior to 2018, are as follows:

(In millions)	Liability at 1/1/17		Amounts Accrued		Cash Paid			Other		Liability at 12/31/17		Amounts Accrued		Cash Paid			Other			Liability at 6/30/18
Severance	$	32	$	31	$	(49	)	$	1	$	15	$	51	$	(22	)	$	(1	)	$	43
Future rent under non-cancelable leases and other costs	61		9		(22		)	2		50		13		(19		)	—			44
Total	$	93	$	40	$	(71	)	$	3	$	65	$	64	$	(41	)	$	(1	)	$	87

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Segment Information (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Selected Information And Details For MMC's Operating Segments

Selected information about the Company’s operating segments for the three and six-month periods ended June 30, 2018 and 2017 are as follows:

	Three Months Ended June 30,							Six Months Ended June 30,
(In millions)	Revenue				Operating Income (Loss)			Revenue				Operating Income (Loss)
2018–
Risk and Insurance Services	$	2,096		(a)	$	472		$	4,440		(c)	$	1,188
Consulting	1,650			(b)	267			3,318			(d)	514
Total Operating Segments	3,746				739			7,758				1,702
Corporate / Eliminations	(12		)		(48		)	(24		)		(103		)
Total Consolidated	$	3,734			$	691		$	7,734			$	1,599
2017–
Risk and Insurance Services	$	1,916		(a)	$	482		$	3,905		(c)	$	1,050
Consulting	1,592			(b)	265			3,118			(d)	490
Total Operating Segments	3,508				747			7,023				1,540
Corporate / Eliminations	(13		)		(46		)	(25		)		(90		)
Total Consolidated	$	3,495			$	701		$	6,998			$	1,450

^(a)Includes inter-segment revenue of $4 million in 2017, interest income on fiduciary funds of $15 million and $9 million in 2018 and 2017, respectively, and equity method income of $7 million in both 2018 and 2017.

^(b)Includes inter-segment revenue of $12 million and $9 million in 2018 and 2017, respectively, interest income on fiduciary funds of $1 million and less than $1 million in 2018and2017, respectively, and equity method income of $5 million in both 2018 and in 2017.

^(c) Includes inter-segment revenue of $1 million and $4 million in 2018 and 2017, respectively, interest income on fiduciary funds of $28 million and $17 million in 2018 and 2017, respectively, and equity method income of $6 million and $9 million in 2018 and 2017, respectively.

^(d) Includes inter-segment revenue of $23 million and $21 million in 2018 and 2017, respectively, interest income on fiduciary funds of $2 million and $1 million in 2018 and 2017, respectively, and equity method income of $8 million in 2018 and $9 million in 2017, respectively.

Details of Operating Segment Revenue

Details of operating segment revenue for the three and six-month periods ended June 30, 2018 and 2017 are as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
(In millions)	2018			2017			2018			2017
Risk and Insurance Services
Marsh	$	1,760		$	1,621		$	3,463		$	3,223
Guy Carpenter	336			295			977			682
Total Risk and Insurance Services	2,096			1,916			4,440			3,905
Consulting
Mercer	1,158			1,109			2,329			2,186
Oliver Wyman Group	492			483			989			932
Total Consulting	1,650			1,592			3,318			3,118
Total Operating Segments	3,746			3,508			7,758			7,023
Corporate / Eliminations	(12		)	(13		)	(24		)	(25		)
Total	$	3,734		$	3,495		$	7,734		$	6,998

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New Accounting Guidance (Tables)

6 Months Ended

Jun. 30, 2018

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

The impact of adoption of the new revenue standard on the Company's consolidated income statement was as follows (in millions):

	Three Months Ended June 30,									Six Months Ended June 30,
	As Reported			Revenue Standard Impact			Legacy GAAP			As Reported			Revenue Standard Impact			Legacy GAAP
Revenue	$	3,734		$	(24	)	$	3,710		$	7,734		$	(185	)	$	7,549
Expense:
Compensation and Benefits	2,135			(10		)	2,125			4,359			(70		)	4,289
Other Operating Expenses	908			—			908			1,776			—			1,776
Operating Expenses	3,043			(10		)	3,033			6,135			(70		)	6,065
Operating Income	691			(14		)	677			1,599			(115		)	1,484
Other Net Benefit Credits	65			—			65			131			—			131
Interest Income	3			—			3			6			—			6
Interest Expense	(68		)	—			(68		)	(129		)	—			(129		)
Investment Income	28			—			28			28			—			28
Income Before Income Taxes	719			(14		)	705			1,635			(115		)	1,520
Income Tax Expense	183			(4		)	179			403			(30		)	373
Net Income Before Non-Controlling Interests	536			(10		)	526			1,232			(85		)	1,147
Less: Net Income Attributable to Non-Controlling Interests	5			—			5			11			—			11
Net Income Attributable to the Company	$	531		$	(10	)	$	521		$	1,221		$	(85	)	$	1,136

The impact of adoption of the new revenue standard on the Company's consolidated balance sheet was as follows (in millions):

	June 30, 2018
	As Reported			Revenue Standard Impact			Legacy GAAP
ASSETS
Current assets:
Cash and cash equivalents	$	1,036		$	—		$	1,036
Net receivables	4,601			(254		)	4,347
Other current assets	538			(298		)	240
Total current assets	6,175			(552		)	5,623
Goodwill and intangible assets	10,411			—			10,411
Fixed assets, net	698			—			698
Pension related assets	1,808			—			1,808
Deferred tax assets	532			133			665
Other assets	1,535			(230		)	1,305
TOTAL ASSETS	$	21,159		$	(649	)	$	20,510
LIABILITIES AND EQUITY
Current liabilities:
Short-term debt	$	439		$	—		$	439
Accounts payable and accrued liabilities	2,246			(177		)	2,069
Accrued compensation and employee benefits	1,103			—			1,103
Accrued income taxes	216			—			216
Dividends payable	212			—			212
Total current liabilities	4,216			(177		)	4,039
Fiduciary liabilities	5,118			—			5,118
Less - cash and investments held in a fiduciary capacity	(5,118		)	—			(5,118		)
	—			—			—
Long-term debt	5,813			—			5,813
Pension, post-retirement and post-employment benefits	1,768			—			1,768
Liabilities for errors and omissions	303			—			303
Other liabilities	1,262			(23		)	1,239
Total equity	7,797			(449		)	7,348
TOTAL LIABILITIES AND EQUITY	$	21,159		$	(649	)	$	20,510

The impact of adoption of the new revenue standard on the Company's consolidated statement of cash flow was as follows (in millions):

	Six Months Ended June 30, 2018
	As Reported			Revenue Standard Impact			Legacy GAAP
Operating cash flows:
Net income before non-controlling interests	$	1,232		$	(85	)	$	1,147
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization of fixed assets and capitalized software	159			—			159
Amortization of intangible assets	88			—			88
Adjustments and payments related to contingent consideration liability	2			—			2
Provision for deferred income taxes	34			—			34
Gain on investments	(28		)	—			(28		)
Gain on disposition of assets	(1		)	—			(1		)
Share-based compensation expense	99			—			99
Changes in assets and liabilities:
Net receivables	(388		)	186			(202		)
Other current assets	4			(20		)	(16		)
Other assets	(10		)	(26		)	(36		)
Accounts payable and accrued liabilities	30			(55		)	(25		)
Accrued compensation and employee benefits	(614		)	—			(614		)
Accrued income taxes	18			—			18
Contributions to pension excess of expense/credit	(178		)	—			(178		)
Other liabilities	(10		)	—			(10		)
Effect of exchange rate changes	(24		)	—			(24		)
Net cash provided by operations	$	413		$	—		$	413

Theadoption of the revenue recognition standard did not have an impact on the Company's financing or investing cash flows.

New Accounting Pronouncement, Early Adoption

The impact on the Company's balance sheet as of January 1, 2018 related to the adoption of the accounting standards using the modified retrospective approach as discussed above is as follows:

			Adjustments
	Balance at December 31, 2017		Revenue Recognition			Financial Instruments			Intra-Entity Transfer			Balance at January 1, 2018
Balance Sheet
Assets
Net Receivables	$	4,133	$	68		$	—		$	—		$	4,201
Other Current Assets	224		318			—			—			542
Other Assets	1,430		226			—			—			1,656
Deferred Tax Assets	669		(103		)	—			(14		)	552
Liabilities
Accounts Payable and Accrued Liabilities	2,083		122			—			—			2,205
Other Liabilities	1,311		23			—			—			1,334
Equity
Other Accumulated Comprehensive Income	—		—			(14		)	—			(14		)
Retained Earnings	$	13,140	$	364		$	14		$	(14	)	$	13,504

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Nature of Operations (Details) $ in Billions	6 Months Ended
	Jun. 30, 2018 USD ($) segment
Segment Reporting Information [Line Items]
Number of business segments | segment	2
Mercer Consulting Group
Segment Reporting Information [Line Items]
Assets under management | $	$ 240

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Principles of Consolidation And Other Matters (Details)	3 Months Ended			6 Months Ended
	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($) discrete_charge	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017	Jan. 01, 2018 USD ($)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Operating funds related to regulatory requirements or as collateral under captive insurance arrangements	$ 189,000,000			$ 189,000,000
Equity method investments lag period				3 months
Investment income	28,000,000		$ 5,000,000	$ 26,000,000
Equity method income	2,000,000			$ 9,000,000
Gains on equity investments	$ 19,000,000
Effective tax rate (as a percent)	25.60%		28.60%	24.70%	25.90%
Number of discrete charges | discrete_charge		2
Period for payable on undistributed earnings				8 years
Provisional income tax expense (benefit)				$ 240,000,000
Transition tax for accumulated foreign earnings, liability	$ 3,400,000,000			3,400,000,000
Provisional withholding and state income tax expense (benefit)				53,000,000
Change in tax rate, deferred tax asset, provisional income tax expense (benefit)				220,000,000
Increase to income tax expense (benefit)				3,000,000
Unrecognized tax benefits	72,000,000	$ 71,000,000		72,000,000
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	$ 8,000,000			$ 8,000,000
Retained Earnings
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Cumulative effect of new accounting principle in period of adoption		$ 14,000,000				$ 14,000,000

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Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 14,131	$ 14,131	$ 13,504	$ 13,140
Contract with customer, asset, additions		215
Contract with customer, asset, reclassified to receivable		166
Contract with customer, liability, revenue recognized		334
Performance obligation satisfied in previous period		36
Capitalized contract cost, amortization	261	557
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	364	$ 364	$ 364
Health Brokerage and Consulting
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contract with customer, percent		70.00%
Marsh Insurance Group
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, remaining performance obligation	48	$ 48
Mercer Consulting Group
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, remaining performance obligation	450	450
Oliver Wyman Group Consulting Group
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, remaining performance obligation	2	2
Deferred Implementation Costs
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized contract cost, net	39	39
Costs to Obtain
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized contract cost, net	196	196
Costs to Fulfill
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized contract cost, net	$ 154	$ 154

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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Risk and Insurance Services Segment
Disaggregation of Revenue [Line Items]
Revenue	$ 2,096	$ 4,440
Fiduciary interest income	15	28
Risk and Insurance Services Segment | EMEA
Disaggregation of Revenue [Line Items]
Revenue	526	1,169
Risk and Insurance Services Segment | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	183	347
Risk and Insurance Services Segment | Latin America
Disaggregation of Revenue [Line Items]
Revenue	99	183
Risk and Insurance Services Segment | Total International
Disaggregation of Revenue [Line Items]
Revenue	808	1,699
Risk and Insurance Services Segment | U.S./Canada
Disaggregation of Revenue [Line Items]
Revenue	941	1,744
Consulting Segment
Disaggregation of Revenue [Line Items]
Revenue	1,650	3,318
Defined Benefit Consulting & Administration | Consulting Segment
Disaggregation of Revenue [Line Items]
Revenue	320	659
Investment Management & Related Services | Consulting Segment
Disaggregation of Revenue [Line Items]
Revenue	232	458
Total Wealth | Consulting Segment
Disaggregation of Revenue [Line Items]
Revenue	552	1,117
Health | Consulting Segment
Disaggregation of Revenue [Line Items]
Revenue	429
Career | Consulting Segment
Disaggregation of Revenue [Line Items]
Revenue	177
Marsh Insurance Group | Risk and Insurance Services Segment
Disaggregation of Revenue [Line Items]
Revenue	1,749	3,443
Guy Carpenter Reinsurance Group | Risk and Insurance Services Segment
Disaggregation of Revenue [Line Items]
Revenue	332	969
Marsh & Guy Carpenter | Risk and Insurance Services Segment
Disaggregation of Revenue [Line Items]
Revenue	2,081	4,412
Mercer Consulting Group | Consulting Segment
Disaggregation of Revenue [Line Items]
Revenue	1,158	2,329
Oliver Wyman Group Consulting Group | Consulting Segment
Disaggregation of Revenue [Line Items]
Revenue	$ 492	$ 989

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Revenue - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Contract Assets	$ 178	$ 128
Contract Liabilities	$ 647	$ 583

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Revenue - Estimated Revenue Expected to Be Recognized Related to Performance Obligations (Details) $ in Millions	Jun. 30, 2018 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-03-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 239
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-03-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	129
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-03-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	74
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-03-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	41
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-03-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 17

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Fiduciary Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Fiduciary Assets and Liabilities [Line Items]
Net uncollected premiums and claims receivable and payable	$ 8,300		$ 8,300		$ 6,800
Risk and Insurance Services Segment
Fiduciary Assets and Liabilities [Line Items]
Interest on fiduciary funds (less than)	15		28
Operating Segments | Risk and Insurance Services Segment
Fiduciary Assets and Liabilities [Line Items]
Interest on fiduciary funds (less than)	15	$ 9	28	$ 17
Operating Segments | Consulting Segment
Fiduciary Assets and Liabilities [Line Items]
Interest on fiduciary funds (less than)	$ 1	$ 1	$ 2	$ 1

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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income before non-controlling interests	$ 536	$ 507	$ 1,232	$ 1,085
Less: Net income attributable to non-controlling interests	5	6	11	15
Net income attributable to the Company	$ 531	$ 501	$ 1,221	$ 1,070
Basic weighted average common shares outstanding (in shares)	507.0	514.0	507.0	514.0
Dilutive effect of potentially issuable common shares (in shares)	5.0	6.0	6.0	7.0
Diluted weighted average common shares outstanding (in shares)	512.0	520.0	513.0	521.0
Average stock price used to calculate common stock equivalents (in dollars per share)	$ 81.64	$ 75.41	$ 82.24	$ 73.36
Stock options outstanding (in shares)	10.5	12.4	10.5	12.4

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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	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Supplemental Cash Flow Information [Abstract]
Assets acquired, excluding cash	$ 204	$ 576
Liabilities assumed	(28)	(74)
Contingent/deferred purchase consideration	(32)	(90)
Net cash outflow for current year acquisitions	144	412
Interest paid	107	92
Income taxes paid, net of refunds	$ 349	$ 297

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Supplemental Disclosures to the Consolidated Statements of Cash Flows (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Supplemental Disclosure to the Consolidate Statements of Cash Flows [Line Items]
Deferred and contingent consideration from prior years acquisition	$ 85	$ 97
Contingent consideration from prior year's acquisitions	32	60
Net charge for adjustments related to acquisition related accounts	11	(8)
Payment of contingent consideration	9	5
Non-cash issuance of common stock	128	87
Stock-based compensation expense, equity awards	99	75
Prior Fiscal Periods Acquisitions
Supplemental Disclosure to the Consolidate Statements of Cash Flows [Line Items]
Deferred purchase consideration from prior years' acquisitions	53	37
Contingent consideration from prior year's acquisitions	$ 41	$ 65

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Other Comprehensive Income (Loss) (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive (loss) income, net of tax	$ (360)	$ 296	$ (208)	$ 552
Unrealized Investment Gains
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	0	16	14	19
Cumulative effect of new accounting principle in period of adoption					$ (14)
Other comprehensive income (loss) before reclassifications	0	14	0	11
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Other comprehensive (loss) income, net of tax	0	14	0	11
Balance, ending of period	0	30	0	30
Pension/Postretirement Plans Gains (Losses)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	(2,963)	(3,208)	(2,892)	(3,232)
Cumulative effect of new accounting principle in period of adoption					0
Other comprehensive income (loss) before reclassifications	129	(40)	29	(46)
Amounts reclassified from accumulated other comprehensive income	27	33	56	63
Other comprehensive (loss) income, net of tax	156	(7)	85	17
Balance, ending of period	(2,807)	(3,215)	(2,807)	(3,215)
Foreign Currency Translation Gains (Losses)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	(942)	(1,645)	(1,165)	(1,880)
Cumulative effect of new accounting principle in period of adoption					0
Other comprehensive income (loss) before reclassifications	(516)	289	(293)	524
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Other comprehensive (loss) income, net of tax	(516)	289	(293)	524
Balance, ending of period	(1,458)	(1,356)	(1,458)	(1,356)
AOCI Attributable to Parent
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	(3,905)	(4,837)	(4,043)	(5,093)
Cumulative effect of new accounting principle in period of adoption					$ (14)
Other comprehensive income (loss) before reclassifications	(387)	263	(264)	489
Amounts reclassified from accumulated other comprehensive income	27	33	56	63
Other comprehensive (loss) income, net of tax	(360)	296	(208)	552
Balance, ending of period	$ (4,265)	$ (4,541)	$ (4,265)	$ (4,541)

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Other Comprehensive Income (Loss) (Schedule Of Components Of Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Equity [Abstract]
Foreign currency translation adjustments, Pre-Tax		$ (529)	$ 290	$ (301)	$ 525
Foreign currency translation adjustments, Tax		(13)	1	(8)	1
Foreign currency translation adjustments, Net of Tax		(516)	289	(293)	524
Unrealized investment gains (losses), Pre-Tax		0	24	0	19
Unrealized investment gains (losses), Tax		0	10	0	8
Unrealized investment gains (losses), Net of Tax		0	14	0	11
Pension/post-retirement plans:
Prior services credits, Pre-Tax	[1]	(1)	0	(2)	0
Prior service credits, Tax	[1]	0	0	0	0
Prior service credits, Net of Tax	[1]	(1)	0	(2)	0
Net actuarial loss, Pre-Tax	[1]	37	42	74	82
Net actuarial loss, Tax	[1]	9	9	16	19
Net actuarial loss, Net of Tax	[1]	28	33	58	63
Subtotal, Pre-Tax		36	42	72	82
Subtotal, Tax		9	9	16	19
Subtotal, Net of Tax		27	33	56	63
Effect of remeasurement, Pre-tax		0	0	0	9
Effect of remeasurement, Tax		0	1	0	3
Effect of remeasurement, Net of Tax		0	(1)	0	6
Effect of curtailment, Pre-Tax				0	(1)
Effect of curtailment, Tax				0	0
Effect of curtailment, Net of Tax				0	(1)
Effect of settlement, Pre-tax				0	1
Effect of settlement, Tax				0	0
Effect of settlement, Net of Tax				0	1
Foreign currency translation adjustment, Pre-Tax		156	(47)	36	(62)
Foreign currency translation adjustment, Tax		27	(8)	7	(11)
Foreign currency translation adjustment, Net of Tax		129	(39)	29	(51)
Other, Pre-Tax				0	(1)
Other, Tax				0	0
Other, Net of Tax				0	(1)
Pension/post-retirement plans (losses) gains, Pre-Tax		192	(5)	108	28
Pension/post-retirement plans (losses) gains, Tax		36	2	23	11
Pension/post-retirement plans (losses) gains, Net of Tax		156	(7)	85	17
Other comprehensive (loss) income, before tax		(337)	309	(193)	572
Other comprehensive income (loss), Tax		23	13	15	20
Other comprehensive (loss) income, net of tax		$ (360)	$ 296	$ (208)	$ 552

[1] Components of net periodic pension cost are included in compensation and benefits in the Consolidated Statements of Income. Tax on prior service gains and net actuarial losses is included in income tax expense.

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Acquisitions (Narrative) (Details) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 25, 2018 USD ($) colleague	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) acquisition	Jun. 30, 2017 USD ($)	Dec. 31, 2017 acquisition
Business Acquisition [Line Items]
Total consideration				$ 192	$ 510
Cash				160	420
Estimated fair value of deferred/contingent consideration				32	90
Contingent consideration from prior year's acquisitions				32	60
Current Fiscal Period Acquisitions
Business Acquisition [Line Items]
Total consideration				192
Cash				160
Estimated fair value of deferred/contingent consideration				32
Revenue related to acquisitions		$ 11	$ 34	14	63
Operating (loss) income related to acquisitions		$ (1)	$ 5	(2)	15
Prior Fiscal Periods Acquisitions
Business Acquisition [Line Items]
Deferred purchase consideration from prior years' acquisitions				53	37
Contingent consideration from prior year's acquisitions				$ 41	$ 65
Wortham Insurance
Business Acquisition [Line Items]
Revenue	$ 130
Number of colleagues | colleague	530
Risk and Insurance Services Segment
Business Acquisition [Line Items]
Number of acquisitions made (in acquisitions) | acquisition				7		7
Consulting Segment
Business Acquisition [Line Items]
Number of acquisitions made (in acquisitions) | acquisition				5		3
Minimum
Business Acquisition [Line Items]
Revenue target period (in years)				2 years
Minimum | Current Fiscal Period Acquisitions
Business Acquisition [Line Items]
Revenue target period (in years)				2 years
Maximum
Business Acquisition [Line Items]
Revenue target period (in years)				4 years
Maximum | Current Fiscal Period Acquisitions
Business Acquisition [Line Items]
Revenue target period (in years)				4 years

XML

Acquisitions (Allocation Of Acquisition Costs) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Cash	$ 160	$ 420
Estimated fair value of deferred/contingent consideration	32	90
Total Consideration	192	510
Allocation of purchase price:
Goodwill	9,177	$ 8,821	$ 9,089	$ 8,369
Current Fiscal Period Acquisitions
Business Acquisition [Line Items]
Cash	160
Estimated fair value of deferred/contingent consideration	32
Total Consideration	192
Allocation of purchase price:
Cash and cash equivalents	16
Accounts receivable, net	12
Property, plant, and equipment	3
Other intangible assets	73
Goodwill	116
Total assets acquired	220
Current liabilities	10
Other liabilities	18
Total liabilities assumed	28
Net assets acquired	$ 192

XML

Acquisitions (Acquired Finite-Lived Intangible Assets) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 73
Client relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 72
Finite-lived intangible assets, remaining amortization period	9 years
Other
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 1
Finite-lived intangible assets, remaining amortization period	4 years

XML

Acquisitions (Pro-Forma Information) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Business Combinations [Abstract]
Revenue	$ 3,748	$ 3,539	$ 7,770	$ 7,098
Net income attributable to the Company	$ 532	$ 503	$ 1,225	$ 1,072
Basic net income per share:
Basic net income per share attributable to the Company (in dollars per share)	$ 1.05	$ 0.98	$ 2.41	$ 2.08
Diluted net income per share:
Diluted net income per share attributable to the Company (in dollars per share)	$ 1.04	$ 0.97	$ 2.39	$ 2.06

XML

Goodwill and Other Intangibles (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Goodwill	$ 9,177	$ 8,821	$ 9,089	$ 8,369
Aggregate amortization expense	88	$ 80
Risk and Insurance Services Segment
Segment Reporting Information [Line Items]
Goodwill	6,500
Consulting Segment
Segment Reporting Information [Line Items]
Goodwill	$ 2,700

XML

Goodwill and Other Intangibles (Changes in the Carrying Amount of Goodwill) (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017
Goodwill [Roll Forward]
Balance as of January 1,		$ 9,089	$ 8,369
Goodwill acquired		116	370
Other adjustments	[1]	(28)	82
Balance at June 30,		$ 9,177	$ 8,821

[1] Primarily reflects the impact of foreign exchange.

XML

Goodwill and Other Intangibles (Amortized Intangible Assets) (Details) - USD ($) $ in Millions		Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Cost		$ 1,948	$ 1,906
Accumulated Amortization		714	632
Net Carrying Amount		1,234	1,274
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross Cost		1,711	1,672
Accumulated Amortization		580	518
Net Carrying Amount		1,131	1,154
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Cost	[1]	237	234
Accumulated Amortization	[1]	134	114
Net Carrying Amount	[1]	$ 103	$ 120

[1] Primarily non-compete agreements, trade names and developed technology.

XML

Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
2018 (excludes amortization through June 30, 2018)	$ 94
2019	173
2020	154
2021	143
2022	132
Subsequent years	538
Net Carrying Amount	$ 1,234	$ 1,274

XML

Fair Value Measurements (Narrative) (Details) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($)	Jun. 30, 2018 R / shares	Dec. 31, 2017 USD ($)	Dec. 31, 2014 R / shares
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjustments to acquisition related contingent consideration liability			$ 11
Increase in fair value of contingent consideration due to 5% increase in projections			22
Decrease in fair value of contingent consideration due to 5% decrease in projections			(23)
Carrying value of investment	$ 391		391			$ 405
Unrealized investment gains	0	$ 24	0	$ 19
Other investments	64		$ 64
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	63		$ 63			63
Private Equity Funds, Non-US
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of investment	82		82			$ 76
Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value	113		113
Alexander Forbes Group Holdings Limited
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Share price (per share amount) | R / shares					R 5.77		R 7.50
Carrying value of investment	$ 246		$ 246
Percentage of ownership in equity investment	33.00%		33.00%
Investment shares owned | shares	443		443
Market value of investment	$ 188		$ 188
Share price, weighted average (per share amount) | R / shares					R 6.66
Share price, percentage of cost basis	89.00%		89.00%
Alexander Forbes Group Holdings Limited | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Share price (per share amount) | $ / shares	$ 5.00		$ 5.00
Share price, percentage of purchase price	67.00%		67.00%
Alexander Forbes Group Holdings Limited | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Share price (per share amount) | $ / shares	$ 7.34		$ 7.34
Share price, percentage of purchase price	98.00%		98.00%
Benefitfocus
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unrealized investment gains			$ 19
Money Market Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Share price (per share amount) | $ / shares	$ 1.00		$ 1.00

XML

Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions		Jun. 30, 2018	Dec. 31, 2017
Financial instruments owned:
Total assets measured at fair value		$ 276	$ 382
Fiduciary Assets:
Fiduciary assets		129	111
Liabilities:
Total liabilities measured at fair value		185	189
Identical Assets (Level 1)
Financial instruments owned:
Total assets measured at fair value		276	382
Fiduciary Assets:
Fiduciary assets		129	111
Liabilities:
Total liabilities measured at fair value		0	0
Observable Inputs (Level 2)
Financial instruments owned:
Total assets measured at fair value		0	0
Fiduciary Assets:
Fiduciary assets		0	0
Liabilities:
Total liabilities measured at fair value		0	0
Unobservable Inputs (Level 3)
Financial instruments owned:
Total assets measured at fair value		0	0
Fiduciary Assets:
Fiduciary assets		0	0
Liabilities:
Total liabilities measured at fair value		185	189
Money Market Funds
Fiduciary Assets:
Fiduciary assets		129	111
Money Market Funds | Identical Assets (Level 1)
Fiduciary Assets:
Fiduciary assets		129	111
Money Market Funds | Observable Inputs (Level 2)
Fiduciary Assets:
Fiduciary assets		0	0
Money Market Funds | Unobservable Inputs (Level 3)
Fiduciary Assets:
Fiduciary assets		0	0
Other Assets
Financial instruments owned:
Exchange traded equity securities	[1]	99	81
Mutual funds	[1]	144	158
Other Assets | Identical Assets (Level 1)
Financial instruments owned:
Exchange traded equity securities	[1]	99	81
Mutual funds	[1]	144	158
Other Assets | Observable Inputs (Level 2)
Financial instruments owned:
Exchange traded equity securities	[1]	0	0
Mutual funds	[1]	0	0
Other Assets | Unobservable Inputs (Level 3)
Financial instruments owned:
Exchange traded equity securities	[1]	0	0
Mutual funds	[1]	0	0
Cash and Cash Equivalents
Financial instruments owned:
Money market funds	[2]	33	143
Cash and Cash Equivalents | Identical Assets (Level 1)
Financial instruments owned:
Money market funds	[2]	33	143
Cash and Cash Equivalents | Observable Inputs (Level 2)
Financial instruments owned:
Money market funds	[2]	0	0
Cash and Cash Equivalents | Unobservable Inputs (Level 3)
Financial instruments owned:
Money market funds	[2]	0	0
Accounts Payable and Accrued Liabilities and Other Liabilities
Liabilities:
Contingent purchase consideration liability	[3]	185	189
Accounts Payable and Accrued Liabilities and Other Liabilities | Identical Assets (Level 1)
Liabilities:
Contingent purchase consideration liability	[3]	0	0
Accounts Payable and Accrued Liabilities and Other Liabilities | Observable Inputs (Level 2)
Liabilities:
Contingent purchase consideration liability	[3]	0	0
Accounts Payable and Accrued Liabilities and Other Liabilities | Unobservable Inputs (Level 3)
Liabilities:
Contingent purchase consideration liability	[3]	$ 185	$ 189

[1] Included in other assets in the consolidated balance sheets.

[2] Included in cash and cash equivalents in the consolidated balance sheets.

[3] Included in accounts payable and accrued liabilities and other liabilities in the consolidated balance sheets.

XML

Fair Value Measurements (Changes In Fair Value Of Level 3 Liabilities Representing Acquisition Related Contingent Consideration) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Revaluation Impact				$ 11	$ (8)
Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period,		$ 161	$ 247	189	241
Additions		20	0	26	34
Payments		(1)	(53)	(41)	(65)
Revaluation Impact		6	8		(8)
Other	[1]	(1)	1	0	1
Balance at June 30,		$ 185	$ 203	$ 185	$ 203

[1] Primarily reflects the impact of foreign exchange.

XML

Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer	$ 55
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions in current fiscal year	54
United States
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost recognized	$ 67	$ 65
United States | Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation, percentage	64.00%
Actual asset allocation percentage of equity	63.00%
United States | Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation, percentage	36.00%
Actual asset allocation percentage of equity	37.00%
United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost recognized	$ 42	$ 38
United Kingdom | Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation, percentage	34.00%
Actual asset allocation percentage of equity	35.00%
United Kingdom | Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation, percentage	66.00%
Actual asset allocation percentage of equity	65.00%
United Kingdom | Geographic Concentration Risk | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Concentration risk percentage	81.00%

XML

Retirement Benefits (Schedule Of Defined Benefit Plan Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits expense (Operating income)	$ (691)	$ (701)	$ (1,599)	$ (1,450)
Other net benefit credits	(65)	(63)	(131)	(123)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	19	17	37
Interest cost	117	124	235	246
Expected return on plan assets	(218)	(230)	(439)	(454)
Amortization of prior service cost	(1)	(1)	(1)	(1)
Recognized actuarial loss	37	43	74	83
Net periodic benefit (credit) cost	(58)	(45)	(114)	(89)
Curtailment loss (credit)			0	(1)
Settlement loss			0	1
Compensation and benefits expense (Operating income)	(7)	(19)	(17)	(37)
Other net benefit credits	(65)	(64)	(131)	(126)
Total (credit) cost	(58)	(45)	(114)	(89)
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	1	1	2	2
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	(1)	0	(2)	1
Recognized actuarial loss	0	0	0	0
Net periodic benefit (credit) cost	0	1	0	3
Curtailment loss (credit)			0	0
Settlement loss			0	0
Compensation and benefits expense (Operating income)	0	0	0	0
Other net benefit credits	0	1	0	3
Total (credit) cost	0	1	0	3
Domestic Plan | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	59	66	118	132
Expected return on plan assets	(90)	(90)	(179)	(179)
Amortization of prior service cost	0	0	0	0
Recognized actuarial loss	14	10	27	19
Net periodic benefit (credit) cost	(17)	(14)	(34)	(28)
Domestic Plan | Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	1	1	1	1
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	(1)	1	(1)	2
Recognized actuarial loss	0	(1)	0	(1)
Net periodic benefit (credit) cost	0	1	0	2
Foreign Plan | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	19	17	37
Interest cost	58	58	117	114
Expected return on plan assets	(128)	(140)	(260)	(275)
Amortization of prior service cost	(1)	(1)	(1)	(1)
Recognized actuarial loss	23	33	47	64
Net periodic benefit (credit) cost	(41)	(31)	(80)	(61)
Curtailment loss (credit)			0	(1)
Settlement loss			0	1
Total (credit) cost			(80)	(61)
Foreign Plan | Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	0	0	1	1
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	(1)	(1)	(1)
Recognized actuarial loss	0	1	0	1
Net periodic benefit (credit) cost	$ 0	$ 0	0	1
Curtailment loss (credit)			0	0
Settlement loss			0	0
Total (credit) cost			$ 0	$ 1

XML

Retirement Benefits (Schedule Of Defined Benefit Plan Weighted Average Assumption Used In Calculating Net Periodic Benefit Cost) (Details)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Pension Benefits
Weighted average assumptions:
Expected return on plan assets	5.83%	6.64%
Discount rate	3.07%	3.40%
Rate of compensation increase	1.73%	1.77%
Postretirement Benefits
Weighted average assumptions:
Expected return on plan assets	0.00%	0.00%
Discount rate	3.21%	3.64%
Rate of compensation increase	0.00%	0.00%

XML

Debt (Schedule Of Outstanding Debt) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jan. 31, 2017
Debt Instrument [Line Items]
Commercial paper outstanding	$ 175	$ 0
Current portion of long-term debt	264	262
Short-term debt	439	262
Long-term debt, current and noncurrent	6,077	5,487
Long-term debt	5,813	5,225
2.55% Senior Debt Obligations Due 2018
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	$ 250	250
Interest rate	2.55%
2.35% Senior Debt Obligations Due 2019
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	$ 299	299
Interest rate	2.35%
2.35% Senior Debt Obligations Due 2020
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	$ 499	498
Interest rate	2.35%
4.80% Senior Debt Obligations Due 2021
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	$ 498	498
Interest rate	4.80%
2.75% Senior Debt Obligations Due 2022
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	$ 497	496
Interest rate	2.75%		2.75%
3.30% Senior Debt Obligations Due 2023
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	$ 348	348
Interest rate	3.30%
4.05% Senior Debt Obligations Due 2023
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	$ 248	248
Interest rate	4.05%
3.50% Senior Debt Obligations Due 2024
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	$ 597	596
Interest rate	3.50%
3.50% Senior Debt Obligations Due 2025
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	$ 496	496
Interest rate	3.50%
3.75% Senior Debt Obligations Due 2026
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	$ 596	596
Interest rate	3.75%
5.875% Senior Debt Obligations Due 2033
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	$ 297	297
Interest rate	5.875%
4.35% Senior Debt Obligation Due 2047
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	$ 492	492
Interest rate	4.35%		4.35%
4.20% Senior Debt Obligations Due 2048
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	$ 592	0
Interest rate	4.20%
Mortgage Due 2035
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	$ 364	370
Interest rate	5.70%
Other
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	$ 4	$ 3

XML

Debt (Narrative) (Details) - USD ($)	1 Months Ended	6 Months Ended
	Apr. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jan. 31, 2017
Debt Instrument [Line Items]
Commercial paper outstanding		$ 175,000,000	$ 0
Repayments of senior debt	$ 250,000,000
4.20% Senior Debt Obligations Due 2048
Debt Instrument [Line Items]
Proceeds from issuance of debt		$ 600,000,000
Interest rate		4.20%
2.75% Senior Debt Obligations Due 2022
Debt Instrument [Line Items]
Proceeds from issuance of debt				$ 500,000,000
Interest rate		2.75%		2.75%
4.35% Senior Debt Obligation Due 2047
Debt Instrument [Line Items]
Proceeds from issuance of debt				$ 500,000,000
Interest rate		4.35%		4.35%
3.30% Senior Debt Obligations Due 2023
Debt Instrument [Line Items]
Interest rate		3.30%
Amended Revolving Credit Facility March 27, 2014
Debt Instrument [Line Items]
Debt facilities, maximum borrowing capacity		$ 1,500,000,000
Term of debt		5 years
Revolving credit facility, amount outstanding		$ 0
Commercial Paper
Debt Instrument [Line Items]
Debt financing program		$ 1,500,000,000
Effective interest rate		2.25%

XML

Debt (Estimated Fair Value of Significant Financial Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term debt	$ 439	$ 262
Long-term debt	5,813	5,225
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term debt	440	264
Long-term debt	$ 5,826	$ 5,444

XML

Restructuring Costs (Restructuring Activities) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2018	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Liability at beginning of period		$ 65	$ 93
Amounts Accrued		64	40
Cash Paid		(41)	(71)
Other		(1)	3
Liability at end of period		87	65
Severance and Future rent under non-cancelable leases and other costs
Restructuring Reserve [Roll Forward]
Amounts Accrued		9
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 55
Restructuring Reserve [Roll Forward]
Liability at beginning of period		15	32
Amounts Accrued		51	31
Cash Paid		(22)	(49)
Other		(1)	1
Liability at end of period		43	15
Future rent under non-cancelable leases and other costs
Restructuring Reserve [Roll Forward]
Liability at beginning of period		50	61
Amounts Accrued		13	9
Cash Paid		(19)	(22)
Other		0	2
Liability at end of period		44	$ 50
Operating Segments | Risk and Insurance Services Segment | Acquisition Related
Restructuring Reserve [Roll Forward]
Amounts Accrued		3
Operating Segments | Consulting Segment | Acquisition Related
Restructuring Reserve [Roll Forward]
Amounts Accrued		1
Corporate | Acquisition Related
Restructuring Reserve [Roll Forward]
Amounts Accrued		$ 5

XML

Common Stock (Details) - USD ($) shares in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Nov. 30, 2016
Equity, Class of Treasury Stock [Line Items]
Payments for repurchase of common stock	$ 500	$ 400
Stock-based compensation, shares issued during period	2.5	3.7
Common Stock
Equity, Class of Treasury Stock [Line Items]
Common stock repurchased (in shares)	6.1	5.4
Payments for repurchase of common stock	$ 500	$ 400
Share repurchases program, authorized amount (up to)			$ 2,500
Stock repurchase program, remaining authorized repurchase amount	$ 1,000

XML

Claims, Lawsuits And Other Contingencies (Details) £ in Millions	Jun. 30, 2018 GBP (£)
Other Contingencies-Guarantees
Loss Contingencies [Line Items]
Amount reinsured by third party (up to)	£ 40

XML

Segment Information (Selected Information And Details For MMC's Operating Segments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 3,734	$ 3,495	$ 7,734	$ 6,998
Operating Income (Loss)	691	701	1,599	1,450
Equity method income	2		9
Risk and Insurance Services Segment
Segment Reporting Information [Line Items]
Interest on fiduciary funds (less than)	15		28
Operating Segments
Segment Reporting Information [Line Items]
Revenue	3,746	3,508	7,758	7,023
Operating Income (Loss)	739	747	1,702	1,540
Operating Segments | Risk and Insurance Services Segment
Segment Reporting Information [Line Items]
Revenue	2,096	1,916	4,440	3,905
Operating Income (Loss)	472	482	1,188	1,050
Interest on fiduciary funds (less than)	15	9	28	17
Equity method income	7	7	6	9
Operating Segments | Consulting Segment
Segment Reporting Information [Line Items]
Revenue	1,650	1,592	3,318	3,118
Operating Income (Loss)	267	265	514	490
Interest on fiduciary funds (less than)	1	1	2	1
Equity method income	5	5	8	9
Corporate and Eliminations
Segment Reporting Information [Line Items]
Revenue	(12)	(13)	(24)	(25)
Operating Income (Loss)	(48)	(46)	(103)	(90)
Intersegment Eliminations | Risk and Insurance Services Segment
Segment Reporting Information [Line Items]
Revenue		4	1	4
Intersegment Eliminations | Consulting Segment
Segment Reporting Information [Line Items]
Revenue	$ 12	$ 9	$ 23	$ 21

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Segment Information (Details of Operating Segment Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 3,734	$ 3,495	$ 7,734	$ 6,998
Operating Segments
Segment Reporting Information [Line Items]
Revenue	3,746	3,508	7,758	7,023
Operating Segments | Risk and Insurance Services Segment
Segment Reporting Information [Line Items]
Revenue	2,096	1,916	4,440	3,905
Operating Segments | Risk and Insurance Services Segment | Marsh Insurance Group
Segment Reporting Information [Line Items]
Revenue	1,760	1,621	3,463	3,223
Operating Segments | Risk and Insurance Services Segment | Guy Carpenter Reinsurance Group
Segment Reporting Information [Line Items]
Revenue	336	295	977	682
Operating Segments | Consulting Segment
Segment Reporting Information [Line Items]
Revenue	1,650	1,592	3,318	3,118
Operating Segments | Consulting Segment | Mercer Consulting Group
Segment Reporting Information [Line Items]
Revenue	1,158	1,109	2,329	2,186
Operating Segments | Consulting Segment | Oliver Wyman Group Consulting Group
Segment Reporting Information [Line Items]
Revenue	492	483	989	932
Corporate and Eliminations
Segment Reporting Information [Line Items]
Revenue	$ (12)	$ (13)	$ (24)	$ (25)

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New Accounting Guidance - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 14,131	$ 13,504	$ 13,140
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption		14	$ 14
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 364	364
Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		(14)
Accounting Standards Update 2016-16 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption		$ (14)

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New Accounting Guidance - ASC 606 (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues [Abstract]
Revenue	$ 3,734	$ 3,495	$ 7,734	$ 6,998
Expense:
Compensation and benefits	2,135	1,998	4,359	4,003
Other operating expenses	908	796	1,776	1,545
Operating expenses	3,043	2,794	6,135	5,548
Operating income	691	701	1,599	1,450
Other net benefit credits	65	63	131	123
Interest income	3	2	6	4
Interest expense	(68)	(60)	(129)	(118)
Investment Income	28	5	28	5
Income before income taxes	719	711	1,635	1,464
Income tax expense	183	204	403	379
Net income before non-controlling interests	536	507	1,232	1,085
Less: Net income attributable to non-controlling interests	5	6	11	15
Net income attributable to the Company	531	501	1,221	1,070
Assets
Cash and cash equivalents	1,036	966	1,036	966		$ 1,205	$ 1,026
Net receivables	4,601		4,601		$ 4,201	4,133
Other current assets	538		538		542	224
Total current assets	6,175		6,175			5,562
Fixed assets, net	698		698			712
Pension related assets	1,808		1,808			1,693
Deferred tax assets	532		532		552	669
Total assets	21,159		21,159			20,429
Liabilities
Short-term debt	439		439			262
Accounts payable and accrued liabilities	2,246		2,246		2,205	2,083
Accrued compensation and employee benefits	1,103		1,103			1,718
Accrued income taxes	216		216			199
Dividends payable	212		212			0
Total current liabilities	4,216		4,216			4,262
Fiduciary liabilities	5,118		5,118			4,847
Less – cash and investments held in a fiduciary capacity	(5,118)		(5,118)			(4,847)
Fiduciary Liabilities, Net, Noncurrent	0		0			0
Long-term debt	5,813		5,813			5,225
Pension, post-retirement and post-employment benefits	1,768		1,768			1,888
Liabilities for errors and omissions	303		303			301
Other liabilities	1,262		1,262		1,334	1,311
Equity [Abstract]
Retained earnings	14,131		14,131		13,504	13,140
Total equity	7,797	7,074	7,797	7,074		7,442
Total liabilities and stockholders' equity	21,159		21,159			$ 20,429
Statement of Cash Flows [Abstract]
Net income before non-controlling interests	536	$ 507	1,232	1,085
Depreciation and amortization of fixed assets and capitalized software			159	156
Amortization of intangible assets			88	80
Adjustments and payments related to contingent consideration liability			2	(13)
Provision for deferred income taxes			34	42
(Gain) loss on investments			(28)	(5)
(Gain) loss on disposition of assets			(1)	9
Share-based compensation expense			99	75
Net receivables			(388)	(318)
Other current assets			4	(18)
Other assets			(10)	(34)
Accounts payable and accrued liabilities			30	52
Accrued compensation and employee benefits			(614)	(579)
Accrued income taxes			18	45
Contributions to pension and other benefit plans in excess of current year expense/credit			(178)	(214)
Other liabilities			(10)	9
Effect of exchange rate changes			(24)	(29)
Net cash provided by operations			413	$ 343
Accounting Standards Update 2014-09
Revenues [Abstract]
Revenue	3,734		7,734
Expense:
Compensation and benefits	2,135		4,359
Other operating expenses	908		1,776
Operating expenses	3,043		6,135
Operating income	691		1,599
Other net benefit credits	65		131
Interest income	3		6
Interest expense	(68)		(129)
Investment Income	28		28
Income before income taxes	719		1,635
Income tax expense	183		403
Net income before non-controlling interests	536		1,232
Less: Net income attributable to non-controlling interests	5		11
Net income attributable to the Company	531		1,221
Assets
Cash and cash equivalents	1,036		1,036
Net receivables	4,601		4,601		68
Other current assets	538		538		318
Total current assets	6,175		6,175
Goodwill and intangible assets	10,411		10,411
Fixed assets, net	698		698
Pension related assets	1,808		1,808
Deferred tax assets	532		532		(103)
Other assets	1,535		1,535
Total assets	21,159		21,159
Liabilities
Short-term debt	439		439
Accounts payable and accrued liabilities	2,246		2,246		122
Accrued compensation and employee benefits	1,103		1,103
Accrued income taxes	216		216
Dividends payable	212		212
Total current liabilities	4,216		4,216
Fiduciary liabilities	5,118		5,118
Less – cash and investments held in a fiduciary capacity	(5,118)		(5,118)
Fiduciary Liabilities, Net, Noncurrent	0		0
Long-term debt	5,813		5,813
Pension, post-retirement and post-employment benefits	1,768		1,768
Liabilities for errors and omissions	303		303
Other liabilities	1,262		1,262		23
Equity [Abstract]
Retained earnings	364		364		$ 364
Total equity	7,797		7,797
Total liabilities and stockholders' equity	21,159		21,159
Statement of Cash Flows [Abstract]
Net income before non-controlling interests			1,232
Depreciation and amortization of fixed assets and capitalized software			159
Amortization of intangible assets			88
Adjustments and payments related to contingent consideration liability			2
Provision for deferred income taxes			34
(Gain) loss on investments			(28)
(Gain) loss on disposition of assets			(1)
Share-based compensation expense			99
Net receivables			(388)
Other current assets			4
Other assets			(10)
Accounts payable and accrued liabilities			30
Accrued compensation and employee benefits			(614)
Accrued income taxes			18
Contributions to pension and other benefit plans in excess of current year expense/credit			(178)
Other liabilities			(10)
Effect of exchange rate changes			(24)
Net cash provided by operations			413
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09
Revenues [Abstract]
Revenue	3,710		7,549
Expense:
Compensation and benefits	2,125		4,289
Other operating expenses	908		1,776
Operating expenses	3,033		6,065
Operating income	677		1,484
Other net benefit credits	65		131
Interest income	3		6
Interest expense	(68)		(129)
Investment Income	28		28
Income before income taxes	705		1,520
Income tax expense	179		373
Net income before non-controlling interests	526		1,147
Less: Net income attributable to non-controlling interests	5		11
Net income attributable to the Company	521		1,136
Assets
Cash and cash equivalents	1,036		1,036
Net receivables	4,347		4,347
Other current assets	240		240
Total current assets	5,623		5,623
Goodwill and intangible assets	10,411		10,411
Fixed assets, net	698		698
Pension related assets	1,808		1,808
Deferred tax assets	665		665
Other assets	1,305		1,305
Total assets	20,510		20,510
Liabilities
Short-term debt	439		439
Accounts payable and accrued liabilities	2,069		2,069
Accrued compensation and employee benefits	1,103		1,103
Accrued income taxes	216		216
Dividends payable	212		212
Total current liabilities	4,039		4,039
Fiduciary liabilities	5,118		5,118
Less – cash and investments held in a fiduciary capacity	(5,118)		(5,118)
Fiduciary Liabilities, Net, Noncurrent	0		0
Long-term debt	5,813		5,813
Pension, post-retirement and post-employment benefits	1,768		1,768
Liabilities for errors and omissions	303		303
Other liabilities	1,239		1,239
Equity [Abstract]
Total equity	7,348		7,348
Total liabilities and stockholders' equity	20,510		20,510
Statement of Cash Flows [Abstract]
Net income before non-controlling interests			1,147
Depreciation and amortization of fixed assets and capitalized software			159
Amortization of intangible assets			88
Adjustments and payments related to contingent consideration liability			2
Provision for deferred income taxes			34
(Gain) loss on investments			(28)
(Gain) loss on disposition of assets			(1)
Share-based compensation expense			99
Net receivables			(202)
Other current assets			(16)
Other assets			(36)
Accounts payable and accrued liabilities			(25)
Accrued compensation and employee benefits			(614)
Accrued income taxes			18
Contributions to pension and other benefit plans in excess of current year expense/credit			(178)
Other liabilities			(10)
Effect of exchange rate changes			(24)
Net cash provided by operations			413
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenues [Abstract]
Revenue	(24)		(185)
Expense:
Compensation and benefits	(10)		(70)
Other operating expenses	0		0
Operating expenses	(10)		(70)
Operating income	(14)		(115)
Other net benefit credits	0		0
Interest income	0		0
Interest expense	0		0
Investment Income	0		0
Income before income taxes	(14)		(115)
Income tax expense	(4)		(30)
Net income before non-controlling interests	(10)		(85)
Less: Net income attributable to non-controlling interests	0		0
Net income attributable to the Company	(10)		(85)
Assets
Cash and cash equivalents	0		0
Net receivables	(254)		(254)
Other current assets	(298)		(298)
Total current assets	(552)		(552)
Goodwill and intangible assets	0		0
Fixed assets, net	0		0
Pension related assets	0		0
Deferred tax assets	133		133
Other assets	(230)		(230)
Total assets	(649)		(649)
Liabilities
Short-term debt	0		0
Accounts payable and accrued liabilities	(177)		(177)
Accrued compensation and employee benefits	0		0
Accrued income taxes	0		0
Dividends payable	0		0
Total current liabilities	(177)		(177)
Fiduciary liabilities	0		0
Less – cash and investments held in a fiduciary capacity	0		0
Fiduciary Liabilities, Net, Noncurrent	0		0
Long-term debt	0		0
Pension, post-retirement and post-employment benefits	0		0
Liabilities for errors and omissions	0		0
Other liabilities	(23)		(23)
Equity [Abstract]
Total equity	(449)		(449)
Total liabilities and stockholders' equity	$ (649)		(649)
Statement of Cash Flows [Abstract]
Net income before non-controlling interests			(85)
Depreciation and amortization of fixed assets and capitalized software			0
Amortization of intangible assets			0
Adjustments and payments related to contingent consideration liability			0
Provision for deferred income taxes			0
(Gain) loss on investments			0
(Gain) loss on disposition of assets			0
Share-based compensation expense			0
Net receivables			186
Other current assets			(20)
Other assets			(26)
Accounts payable and accrued liabilities			(55)
Accrued compensation and employee benefits			0
Accrued income taxes			0
Contributions to pension and other benefit plans in excess of current year expense/credit			0
Other liabilities			0
Effect of exchange rate changes			0
Net cash provided by operations			$ 0

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New Accounting Guidance - Early Adoption (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Net receivables	$ 4,601	$ 4,201	$ 4,133
Other current assets	538	542	224
Other assets	1,535	1,656	1,430
Deferred tax assets	532	552	669
Accounts payable and accrued liabilities	2,246	2,205	2,083
Other liabilities	1,262	1,334	1,311
Other Accumulated Comprehensive Income		(14)	0
Retained earnings	14,131	13,504	$ 13,140
Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Net receivables	4,601	68
Other current assets	538	318
Other assets		226
Deferred tax assets	532	(103)
Accounts payable and accrued liabilities	2,246	122
Other liabilities	1,262	23
Other Accumulated Comprehensive Income		0
Retained earnings	$ 364	364
Accounting Standards Update 2016-01
Disaggregation of Revenue [Line Items]
Net receivables		0
Other current assets		0
Other assets		0
Deferred tax assets		0
Accounts payable and accrued liabilities		0
Other liabilities		0
Other Accumulated Comprehensive Income		(14)
Retained earnings		14
Accounting Standards Update 2016-16
Disaggregation of Revenue [Line Items]
Net receivables		0
Other current assets		0
Other assets		0
Deferred tax assets		(14)
Accounts payable and accrued liabilities		0
Other liabilities		0
Other Accumulated Comprehensive Income		0
Retained earnings		$ (14)