8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

_____________________

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 14(d) of the

Securities Exchange Act of 1934

Date of report (Date of earliest event reported) May 10, 2013

Marsh & McLennan Companies, Inc.

(Exact Name of Registrant as Specified in Charter)

Delaware	1-5998	36-2668272
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(IRS Employer Identification No.)

1166 Avenue of the Americas, New York, NY	10036
(Address of Principal Executive Offices)	(Zip Code)

Registrant’s telephone number, including area code (212) 345-5000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01        Other Events

As previously announced by Marsh & McLennan Companies, Inc. (the "Company"), effective January 1, 2013, the Corporate Benefits and Association businesses, which were previously part of Marsh's US Consumer operations in the Risk and Insurance Services segment, were transferred to Mercer. Accordingly, these businesses are now part of the Consulting segment. In addition, also effective January 1, 2013, Mercer realigned management responsibility for its Outsourcing business within its other lines of business, which did not impact total segment results.

In order to reflect these reclassifications, the Company has attached hereto as Exhibits 99.1 and 99.2, respectively, amended presentations of the following sections of its Annual Report on Form 10-K for the fiscal year ended December 31, 2012. There were no other changes made to the originally filed document:

• Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations; and

• Item 8. Financial Statements and Supplementary Data (including segment data and related disclosures contained in the Company’s audited consolidated financial statements for each of the three years in the period ended December 31, 2012).

Item 9.01        Financial Statements and Exhibits

(d)        Exhibits

Exhibit No.	Exhibit Name
23.1	Consent of Deloitte & Touche LLP
99.1	Amended Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations of the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2012
99.2	Amended Item 8. Financial Statements and Supplementary Data of the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2012
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

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SIGNATURES

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

MARSH & McLENNAN COMPANIES, INC.
By:	/s/ Luciana Fato
Name:	Luciana Fato
Title:	Deputy General Counsel &
	Corporate Secretary

Date:     May 10, 2013

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EXHIBIT INDEX

Exhibit No.	Exhibit Name
23.1	Consent of Deloitte & Touche LLP
99.1	Amended Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations of the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2012
99.2	Amended Item 8. Financial Statements and Supplementary Data of the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2012
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

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INFORMATION CONCERNING FORWARD-LOOKING STATEMENTS

This Current Report on Form 8-K 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,” “future,” “intend,” “plan,” “project” and similar terms, and future or conditional tense verbs like “could,” “may,” “might,” “should,” “will” and “would.” For example, we may use forward-looking statements when addressing topics such as: the outcome of contingencies; the expected impact of acquisitions and dispositions; pension obligations; market and industry conditions; the impact of foreign currency exchange rates; our effective tax rates; the impact of competition; changes in our business strategies and methods of generating revenue; the development and performance of our services and products; changes in the composition or level of our revenues; our cost structure, dividend policy, cash flow and liquidity; future actions by regulators; and the impact of changes in accounting rules.

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

• our exposure to potential liabilities arising from errors and omissions claims against us, particularly in our Marsh and Mercer businesses;

• our ability to make strategic acquisitions and dispositions and to integrate, and realize expected synergies, savings or strategic benefits from the businesses we acquire;

• the impact of any regional, national or global political, economic, regulatory or market conditions on our results of operations and financial condition;

• changes in the funded status of our global defined benefit pension plans and the impact of any increased pension funding resulting from those changes;

• the impact of competition, including with respect to our geographic reach, the sophistication and quality of our services, our pricing relative to competitors, our customers' option to self-insure or utilize internal resources instead of consultants, and our corporate tax rates relative to a number of our competitors;

• the extent to which we retain existing clients and attract new business, and our ability to incentivize and retain key employees;

• our exposure to potential criminal sanctions or civil remedies if we fail to comply with foreign and U.S. laws and regulations that are applicable to our international operations, including trade sanctions laws such as the Iran Threat Reduction and Syria Human Rights Act of 2012, anti-corruption laws such as the U.S. Foreign Corrupt Practices Act and the U.K. Bribery Act 2010, local laws prohibiting corrupt payments to government officials, as well as import and export restrictions;

• our ability to maintain adequate physical, technical and administrative safeguards to protect the security of data;

• the impact of changes in interest rates and deterioration of counterparty credit quality on our results related to our cash balances and investment portfolios, including corporate and fiduciary funds;

• the impact on our net income or cash flows and our effective tax rate in a particular period caused by settled tax audits and expired statutes of limitation;

• the impact on our net income caused by fluctuations in foreign currency exchange rates;

• the potential impact of rating agency actions on our cost of financing and ability to borrow, as well as on our operating costs and competitive position;

• our ability to successfully recover should we experience a disaster or other business continuity problem;

• changes in applicable tax or accounting requirements; and

• potential income statement effects from the application of FASB's ASC Topic No. 740 (“Income Taxes”) regarding accounting treatment of uncertain tax benefits and valuation allowances, including the effect of any subsequent adjustments to the estimates we use in applying this accounting standard.

The factors identified above are not exhaustive. Marsh & McLennan Companies and its subsidiaries operate in a dynamic business environment in which new risks may emerge frequently. Accordingly, we caution readers not to place undue reliance on the above forward-looking statements, which 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 the Company 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 of our most recently filed Annual Report on Form 10-K.

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EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the previously filed Registration Statements on Form S-8 (Registration File Nos. 2-58660, 33-32880, 33-48803, 33-48804, 33-48807, 33-54349, 33-59603, 33-63389, 333-35741, 333-35739, 333-29627, 333-41828, 333-69776, 333-69778, 333-107195, 333-146400, 333-176084, and 333-176085), Registration Statements on Form S-3 (Registration File Nos. 333-67543, 333-108566, 333-136820, 333-161797 and 333-183214), and in Registration Statement on Form S-4 (Registration File No. 333-163405) of our report dated February 27, 2013 (May 10, 2013 as to the effects of changes in segments as disclosed in Notes 1, 6 and 16), relating to the financial statements of Marsh & McLennan Companies, Inc. and subsidiaries (the “Company”) (which report expresses an unqualified opinion and includes an explanatory paragraph regarding the Company's retrospectively adjusted segment disclosures for a transfer of business between segments effective January 1, 2013) appearing in this Current Report on Form 8-K of Marsh & McLennan Companies, Inc. and subsidiaries.

/s/ Deloitte & Touche LLP

New York, New York

May 10, 2013

EX-99.1

EXHIBIT 99.1

Amended Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations of MMC's Annual report on Form 10-K for the fiscal year ended December 31, 2012.

As discussed in Note 16 of these consolidated financial statements included in Amended Item 8, effective

January 1, 2013, the Corporate Benefits and Association businesses, previously part of Marsh's U.S. Consumer operations in the Risk and Insurance Services segment, were transferred to Mercer. Accordingly, these businesses are now part of the Consulting segment. Also, effective January 1, 2013, Mercer realigned management responsibility for its outsourcing business within its other lines of business, which did not impact total Consulting segment results. Accordingly, we have amended segment data and related disclosures contained in this management's discussion and analysis and notes to the consolidated financial statements.

General

Marsh & McLennan Companies, Inc. and Subsidiaries (the “Company”) is a global professional services firm providing advice and solutions principally in the areas of risk, strategy and human capital. It is the parent company of a number of the world’s leading risk experts and specialty consultants, including: Marsh, the insurance broker, intermediary and risk advisor; Guy Carpenter, the risk and reinsurance specialist; Mercer, the provider of HR and related financial advice and services; and Oliver Wyman Group, the management, economic and brand consultancy. With approximately 54,000 employees worldwide and annual revenue of nearly $12 billion, the Company provides analysis, advice and transactional capabilities to clients in more than 100 countries.

The Company conducts business through two segments:

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

• Consulting includes Health, Retirement, Talent and Investments consulting and services, and specialized management and economic consulting services. We conduct business in this segment through Mercer and Oliver Wyman Group.

The Company completed the sale of Kroll in August 2010, and along with other dispositions between 2008 and 2010, has divested its entire Risk Consulting and Technology Segment. The Company has “continuing involvement” in certain Corporate Advisory and Restructuring businesses (“CARG”) that were disposed of in 2008. The runoff of the CARG businesses is being managed by the Company's corporate departments and financial results of these entities are included in “Corporate” for segment reporting purposes.

We describe the primary sources of revenue and categories of expense for each segment below, in our discussion of segment financial results. A reconciliation of segment operating income to total operating income is included in Note 16 to the consolidated financial statements included in Part II Item 8 in this report. The accounting policies used for each segment are the same as those used for the consolidated financial statements.

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

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Consolidated Results of Operations

For the Years Ended December 31, (In millions, except per share figures)	2012			2011		2010
Revenue	$	11,924		$	11,526	$	10,550
Expense
Compensation and Benefits	7,134			6,969		6,465
Other Operating Expenses	2,961			2,919		3,146
Operating Expenses	10,095			9,888		9,611
Operating Income	$	1,829		$	1,638	$	939
Income from Continuing Operations	$	1,204		$	982	$	565
Discontinued Operations, Net of Tax	(3		)	33		306
Net Income Before Non-Controlling Interests	$	1,201		$	1,015	$	871
Net Income Attributable to the Company	$	1,176		$	993	$	855
Net Income from Continuing Operations Per Share:
Basic	$	2.16		$	1.76	$	1.01
Diluted	$	2.13		$	1.73	$	1.00
Net Income Per Share Attributable to the Company:
Basic	$	2.16		$	1.82	$	1.56
Diluted	$	2.13		$	1.79	$	1.55
Average number of shares outstanding:
Basic	544			542		540
Diluted	552			551		544
Shares outstanding at December 31,	545			539		541

Consolidated operating income increased 12% to $1.8 billion in 2012 compared with $1.6 billion in 2011. Revenue in 2012 increased 3% compared to 2011, or 4% on an underlying basis, with growth in each operating company, while expenses increased 2%, or 3% on an underlying basis. This reflects the Company's improved operating efficiency as it continues to monitor and control its expenses in each of its operations.

Risk and Insurance Services operating income increased $134 million or 11% to $1.3 billion in 2012 compared with 2011, resulting from revenue growth at both Marsh and Guy Carpenter.

Consulting operating income increased $75 million or 12% to $692 million in 2012 compared with 2011 primarily due to increased revenue at Mercer and improved operating efficiency.

Consolidated operating income was $1.6 billion in 2011 compared with $939 million in 2010. The 2010 results include a $400 million charge, net of insurance recoveries, for the resolution of the litigation brought by the Alaska Retirement Management Board ("ARMB") and restructuring and other noteworthy items of $139 million. Excluding these charges, consolidated operating income was $1.5 billion in 2010.

Risk and Insurance Services operating income increased $243 million or 25% to $1.2 billion in 2011 compared with 2010, resulting from revenue growth at both Marsh and Guy Carpenter, continued expense discipline and a decrease of $132 million in restructuring and other noteworthy items.

Consulting operating income increased $473 million to $617 million in 2011 primarily due to the $400 million net charge related to the ARMB litigation settlement in 2010. Excluding that item, Consulting operating income increased $73 million, or 13%.

Discontinued operations in 2011 includes a net credit resulting from the resolution of certain legal matters and related insurance recoveries as well as the settlement of certain tax audits and the expiration of the statute of limitations related to certain indemnified matters in connection with the disposals of Putnam and Kroll. These credits are partly offset by the write-off, net of tax, of capitalized software related to the disposal of the Marsh Business Processing Outsourcing ("BPO") business. Discontinued operations in 2010 includes the operating results of Kroll, gains on the sales of Kroll and Kroll Laboratory Specialists ("KLS") totaling $282 million, and insurance recoveries of $16 million related to Putnam market-timing related matters.

Discontinued operations also includes the accretion of interest related to an indemnity for uncertain tax positions provided as part of the purchase by Great-West Life Co. Inc., of Putnam Investments Trust from the Company in August 2007.

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Consolidated net income attributable to the Company was $1.2 billion in 2012, compared with $993 million in 2011 and $855 million in 2010.

Consolidated Revenue and Expense

The Company conducts business in many countries, as a result of which the impact of foreign exchange rate movements may impact period-to-period comparisons of revenue. Similarly, the revenue impact of acquisitions and dispositions may impact period-to-period comparisons of revenue. 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, on the Company’s operating revenues is as follows:

	Year Ended December 31,									Components of Revenue Change*
(In millions, except percentage figures)	2012			2011			% Change GAAP Revenue			Currency Impact			Acquisitions/ Dispositions Impact			Underlying Revenue
Risk and Insurance Services
Marsh	$	5,232		$	4,991		5	%		(2	)%		2	%		5	%
Guy Carpenter	1,079			1,041			4	%	—	(1	)%	—	(1	)%	—	6	%
Subtotal	6,311			6,032			5	%	—	(2	)%	—	2	%	—	5	%
Fiduciary Interest Income	39			47
Total Risk and Insurance Services	6,350			6,079			4	%	—	(2	)%	—	2	%	—	5	%
Consulting
Mercer	4,147			4,004			4	%	—	(1	)%	—	1	%	—	4	%
Oliver Wyman Group	1,466			1,483			(1	)%	—	(2	)%	—	(2	)%	—	3	%
Total Consulting	5,613			5,487			2	%	—	(2	)%	—	—	%	—	4	%
Corporate/Eliminations	(39		)	(40		)
Total Revenue	$	11,924		$	11,526		3	%	—	(2	)%	—	1	%	—	4	%

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

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The following table provides more detailed revenue information for certain of the components presented above:

	Year Ended December 31,						Components of Revenue Change*
(In millions, except percentage figures)	2012		2011		% Change GAAP Revenue		Currency Impact			Acquisitions/ Dispositions Impact			Underlying Revenue
Marsh:
EMEA	$	1,860	$	1,796	4	%	(5	)%	—	3	%	—	5	%
Asia Pacific	656		612		7	%	(1	)%	—	—	%	—	7	%
Latin America	353		334		6	%	(7	)%	—	—	%	—	13	%
Total International	2,869		2,742		5	%	(4	)%	—	2	%	—	6	%
U.S. / Canada	2,363		2,249		5	%	—	%	—	2	%	—	3	%
Total Marsh	$	5,232	$	4,991	5	%	(2	)%	—	2	%	—	5	%
Mercer:
Health	$	1,412	$	1,320	7	%	(1	)%	—	2	%	—	7	%
Retirement	1,396		1,423		(2	)%	(2	)%	—	(1	)%	—	1	%
Talent	604		576		5	%	(2	)%	—	4	%	—	2	%
Investments	735		685		7	%	(1	)%	—	2	%	—	7	%
Total Mercer	$	4,147	$	4,004	4	%	(1	)%	—	1	%	—	4	%

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

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	Year Ended December 31,								Components of Revenue Change*
(In millions, except percentage figures)	2011			2010			% Change GAAP Revenue		Currency Impact			Acquisitions/ Dispositions Impact			Underlying Revenue
Risk and Insurance Services
Marsh	$	4,991		$	4,537		10	%	2	%	—	4	%	—	4	%
Guy Carpenter	1,041			975			7	%	1	%	—	1	%	—	5	%
Subtotal	6,032			5,512			9	%	2	%	—	3	%	—	4	%
Fiduciary Interest Income	47			45
Total Risk and Insurance Services	6,079			5,557			9	%	2	%	—	3	%	—	4	%
Consulting
Mercer	4,004			3,685			9	%	3	%	—	2	%	—	4	%
Oliver Wyman Group	1,483			1,357			9	%	2	%	—	—	%	—	7	%
Total Consulting	5,487			5,042			9	%	3	%	—	1	%	—	5	%
Corporate /Eliminations	(40		)	(49		)
Total Revenue	$	11,526		$	10,550		9	%	2	%	—	2	%	—	5	%

The following table provides more detailed revenue information for certain of the components presented above:

	Year Ended December 31,						Components of Revenue Change*
(In millions, except percentage figures)	2011		2010		% Change GAAP Revenue		Currency Impact			Acquisitions/ Dispositions Impact			Underlying Revenue
Marsh:
EMEA	$	1,796	$	1,674	7	%	2	%	—	2	%	—	4	%
Asia Pacific	612		503		22	%	8	%	—	4	%	—	9	%
Latin America	334		298		12	%	(1	)%	—	—		—	14	%
Total International	2,742		2,475		11	%	3	%	—	2	%	—	6	%
U.S. / Canada	2,249		2,062		9	%	—		—	6	%	—	2	%
Total Marsh	$	4,991	$	4,537	10	%	2	%	—	4	%	—	4	%
Mercer:
Health	$	1,320	$	1,243	6	%	1	%	—	—		—	5	%
Retirement	1,423		1,408		1	%	3	%	—	—	%	—	(1	)%
Talent	576		488		18	%	3	%	—	5	%	—	11	%
Investments	685		546		26	%	8	%	—	6	%	—	11	%
Total Mercer	$	4,004	$	3,685	9	%	3	%	—	2	%	—	4	%

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

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Revenue

Consolidated revenue for 2012 increased 3% to $11.9 billion compared with $11.5 billion in 2011, reflecting a 4% increase in underlying revenue, a 1% increase due to acquisitions and a 2% negative impact of foreign currency translation. Revenue in the Risk and Insurance Services segment increased 4% in 2012 compared with 2011 or 5% on an underlying basis, reflecting increases of 5% in Marsh and 6% in Guy Carpenter. Consulting segment revenue increased 2%, resulting from a 4% increase in Mercer partly offset by a 1% decrease in the Oliver Wyman Group. On an underlying basis, Consulting segment revenue increased 4%, reflecting a 4% increase in Mercer and a 3% increase in the Oliver Wyman Group.

Consolidated revenue for 2011 increased 9% to $11.5 billion compared with $10.6 billion in 2010, reflecting a 5% increase in underlying revenue, a 2% increase due to acquisitions and a 2% positive impact of foreign currency translation. Revenue in the Risk and Insurance Services segment increased 9% in 2011 compared with 2010 or 4% on an underlying basis, reflecting increases of 4% in Marsh and 5% in Guy Carpenter. Consulting segment revenue increased 9%, resulting from 9% increases in both Mercer and the Oliver Wyman Group. On an underlying basis, revenue increased 5%, reflecting a 4% increase in Mercer and a 7% increase in the Oliver Wyman Group.

Operating Expense

Consolidated operating expenses increased 2% in 2012 compared with the same period in 2011. The increase reflects a 3% increase in underlying expenses, a 1% increase due to the impact of acquisitions, offset by a 2% decrease due to the impact of foreign currency exchange translation. The increase in underlying expenses primarily reflects higher incentive compensation and benefits costs and restructuring costs at Mercer, which include exit costs related to a portion of Mercer's Canadian outsourcing business. These increases are partly offset by credits related to the adjustment of acquisition related contingent consideration liabilities.

Consolidated operating expenses increased 3% in 2011 compared with the same period in 2010. Expenses in 2010 include the $400 million ARMB settlement at Mercer. Restructuring and other noteworthy charges, which include legal fees arising from regulatory actions, net of insurance recoveries and credits related to the CARG business divested in 2008, decreased $116 million to $23 million in 2011 as compared to $139 million in 2010. Excluding these charges, expenses were $9.9 billion in 2011 compared with $9.1 billion in 2010, an increase of 9%. The increase reflects a 3% increase due to the impact of foreign currency exchange, a 2% increase due to the impact of acquisitions and a 4% increase in underlying expenses. The increase in underlying expenses primarily reflects higher compensation and benefits costs, including increased pension costs, higher consulting costs, asset-based fees and expenses reimbursable from clients.

Restructuring

In 2012, the Company implemented restructuring actions which resulted in costs totaling $78 million. Approximately $58 million of the restructuring charges related to Mercer, with approximately $51 million in expenses recorded in the fourth quarter of 2012 relating to senior management's operations review, including costs of approximately $16 million related to the disposal of a portion of Mercer's Canadian outsourcing business. The restructuring costs consist primarily of severance and benefits, costs for future rent and other real estate costs. These costs were incurred as follows: Risk and Insurance Services—$8 million (all acquisition related—$ 8 million); Consulting—$58 million (acquisition related—$1 million); and Corporate—$12 million.

Businesses Exited

Marsh's BPO business, previously part of the Marsh U.S. Consumer business, provided policy, claims, call center and accounting operations on an outsourced basis to life insurance carriers. Marsh invested in a technology platform that was designed to make the BPO business scalable and more efficient. During 2011, Marsh decided that it would cease investing in the technology platform and instead exit the business via a sale. In the fourth quarter of 2011, management initiated a plan to sell the Marsh BPO business, which was completed in August 2012. The Company wrote off capitalized software of the BPO business of $17 million, net of tax, which is included in discontinued operations in 2011.

In February 2010, Kroll sold KLS, its substance abuse testing business for $110 million. On August 3, 2010, the Company completed the sale of Kroll to Altegrity for $1.13 billion. The account balances and activities of Kroll and KLS have been segregated and reported as discontinued operations in the accompanying financial statements for 2010. The gain on the sale of Kroll and related tax benefits and the after- tax loss on the disposal of KLS, along with Kroll’s and KLS’s 2010 results of operations are included in discontinued operations.

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Risk and Insurance Services

In the Risk and Insurance Services segment, the Company’s subsidiaries and other affiliated entities act as brokers, agents or consultants for insureds, insurance underwriters and other brokers in the areas of risk management, insurance broking and insurance program management services, primarily under the name of Marsh; and engage in reinsurance broking, catastrophe and financial modeling services and related advisory functions, primarily under the name of Guy Carpenter.

Marsh and Guy Carpenter are compensated for brokerage and consulting services primarily through fees paid by clients and/or commissions paid out of premiums charged by insurance and reinsurance companies. Commission rates vary in amount depending upon the type of insurance or reinsurance coverage provided, the particular insurer or reinsurer, the capacity in which the broker acts and negotiations with clients. Revenues can be affected by premium rate levels in the insurance/reinsurance markets, the amount of risk retained by insurance and reinsurance clients themselves and by the value of the risks that have been insured since commission based compensation is frequently related to the premiums paid by insureds/reinsureds. In many cases, fee compensation may be negotiated in advance, based on the type of risk, coverage required, and service provided by the Company and ultimately placed into the insurance market or retained by the client. The trends and comparisons of revenue from one period to the next can be affected by changes in premium rate levels, fluctuations in client risk retention, and increases or decreases in the value of risks that have been insured, as well as new and lost business, and the volume of business from new and existing clients.

In certain countries, Marsh and Guy Carpenter receive interest income on certain funds (such as premiums and claims proceeds) held in a fiduciary capacity for others. The investment of fiduciary funds is regulated by state and other insurance authorities. These regulations typically provide for segregation of fiduciary funds and limit the types of investments that may be made with them. Interest income from these investments varies depending on the amount of funds invested and applicable interest rates, both of which vary from time to time. For presentation purposes, fiduciary interest is segregated from the other revenues of Marsh and Guy Carpenter and separately presented within the segment, as shown in the revenue by segments charts earlier in this MD&A. In certain countries, Marsh is compensated for insurer consulting services in the form of a fee or as a percentage of premium (or a combination of both).

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

(In millions of dollars)	2012			2011			2010
Revenue	$	6,350		$	6,079		$	5,557
Compensation and Benefits	3,502			3,400			3,172
Other Operating Expenses	1,514			1,479			1,428
Operating Expenses	5,016			4,879			4,600
Operating Income	$	1,334		$	1,200		$	957
Operating Income Margin	21.0		%	19.7		%	17.2		%

Revenue

Revenue in Risk and Insurance Services increased 4% in 2012 compared with 2011 reflecting a 5% increase on an underlying basis, a 2% increase from acquisitions, partly offset by a 2% decrease from the impact of foreign currency exchange translation.

In Marsh, revenue in 2012 was $5.2 billion, an increase of 5% from the prior year, reflecting 5% growth in underlying revenue, a 2% increase from acquisitions partly offset by a 2% decrease resulting from the impact of foreign currency translation. The underlying revenue increase of 5% reflects growth in all major geographies, driven by new business. Underlying revenue increased 13% in Latin America, 7% in Asia Pacific, 3% in U.S. / Canada and 5% in EMEA.

During 2012, Marsh completed the following twelve acquisitions:

• January - Marsh acquired Alexander Forbes' South African brokerage operations, including Alexander Forbes Risk Services and related ancillary operations and insurance broking operations in Botswana and Namibia to expand Marsh's presence in Africa. Marsh subsequently closed the acquisitions of the Alexander Forbes operations in Uganda, Malawi and Zambia.

• March - Marsh & McLennan Agency ("MMA") acquired KSPH, LLC, a middle-market employee benefits agency based in Virginia, and Marsh acquired Cosmos Services (America) Inc., the U.S. insurance brokerage subsidiary of ITOCHU Corp., which specializes in commercial property/casualty, personal lines,

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and employee benefits brokerage services to U.S. subsidiaries of Japanese companies.

• June - MMA acquired Progressive Benefits Solutions, an employee benefits agency based in North Carolina, and Security Insurance Services, Inc., a Wisconsin-based insurance agency which offers property/casualty and employee benefits products and services to individuals and businesses.

• August - MMA acquired Rosenfeld-Einstein, a South Carolina-based employee benefits service provider, and Eidson Insurance, a property/casualty and employee benefits services firm located in Florida.

• October - MMA acquired Howalt+McDowell, a South Dakota-based agency which offers property casualty, surety, personal protection and employee benefits insurance to individuals and businesses, and The Protector Group Insurance Agency, a Massachusetts-based agency which provides property casualty, employee benefits services, personal insurance and individual financial services.

• November - MMA acquired Brower Insurance, an Ohio-based company providing employee benefits, property casualty and consulting services.

• December - MMA acquired McGraw Wentworth, a Michigan-based company providing consulting services to mid-sized organizations, and Liscomb Hood Mason, a Minnesota-based company providing property casualty and employee benefits products and services.

The MMA acquisitions were made to expand Marsh's presence in the U.S. middle-market business.

In January 2011, Marsh acquired RJF Agencies, an independent insurance agency in the upper Midwest. In February 2011, Marsh acquired Hampton Roads Bonding, a surety bonding agency for commercial, road, utility, maritime and government contractors in the state of Virginia, and the Boston office of Kinloch Consulting Group, Inc. In July 2011, Marsh acquired Prescott Pailet Benefits, an employee benefits broker based in Texas. In October 2011, Marsh acquired the employee benefits division of Kaeding, Ernst & Co, a Massachusetts based employee benefits, life insurance and financial planning consulting firm. In November 2011, Marsh acquired Seitlin Insurance, a property and casualty insurance and employee benefits firm located in South Florida.

Guy Carpenter’s revenue increased 4% to $1.1 billion in 2012 compared with 2011, or 6% on an underlying basis driven by Carpenter's International operations, particularly Global Specialties, Asia Pacific, EMEA, Latin America, and Global Facultative.

Fiduciary interest income was $39 million in 2012 compared to $47 million in 2011 due to slightly lower average invested funds combined with lower interest rates.

Revenue in Risk and Insurance Services increased 9% in 2011 compared with 2010 reflecting a 4% increase on an underlying basis, a 3% increase from acquisitions, and a 2% increase from the impact of foreign currency exchange translation.

In Marsh, revenue in 2011 was $5.0 billion, an increase of 10% from the prior year, reflecting 4% growth in underlying revenue, a 4% increase from acquisitions and a 2% increase resulting from the impact of foreign currency translation. The underlying revenue increase of 4% reflected growth in all major geographies, driven by higher retention rates and new business development. Underlying revenue increased 14% in Latin America, 9% in Asia Pacific, 2% in U.S. / Canada and 4% in EMEA.

Guy Carpenter’s revenue increased 7% to $1.0 billion in 2011 compared with 2010, or 5% on an underlying basis. The increase in underlying revenue was driven by strong new business development and high retention rates.

Fiduciary interest income was $47 million in 2011 compared to $45 million in 2010 due to higher average invested funds partly offset by lower interest rates.

Expense

Expenses in the Risk and Insurance Services segment increased 3% in 2012 compared with 2011, reflecting a 2% increase from acquisitions and a 2% decrease due to the impact of foreign currency translation. Expenses on an underlying basis increased 3% primarily due to higher base salaries and incentive compensation and benefits costs partly offset by credits related to adjustments to acquisition related contingent consideration liabilities.

Expenses in the Risk and Insurance Services segment increased 6% in 2011 compared with 2010, reflecting a 3% increase from acquisitions and a 2% increase due to the impact of foreign currency translation. Expenses on an underlying basis increased 1%. The increase in underlying expenses is primarily due to higher base salaries and incentive compensation costs, non-restructuring related severance costs and facilities and equipment costs, partly offset by lower restructuring expenses and a credit of $31 million for insurance recoveries on previously expensed legal fees.

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Consulting

The Company conducts business in its Consulting segment through two main business groups. Mercer provides consulting expertise, advice, services and solutions in the areas of health, retirement, talent and investments. Oliver Wyman Group provides specialized management, economic and brand consulting services.

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

Revenue in the Consulting segment is affected by, among other things, global economic conditions, including changes in clients’ particular industries and markets. Revenue is also affected by competition due to the introduction of new products and services, broad trends in employee demographics, including levels of employment, the effect of government policies and regulations, and fluctuations in interest and foreign exchange rates. Revenues from the provision of investment management services and retirement trust and administrative services are significantly affected by securities market performance.

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

(In millions of dollars)	2012			2011			2010
Revenue	$	5,613		$	5,487		$	5,042
Compensation and Benefits	3,298			3,315			3,063
Other Operating Expenses	1,623			1,555			1,835
Operating Expenses	4,921			4,870			4,898
Operating Income	$	692		$	617		$	144
Operating Income Margin	12.3		%	11.2		%	2.9		%

Revenue

Consulting revenue in 2012 increased 2% compared with 2011, or 4% on an underlying basis. Mercer’s revenue was $4.1 billion in 2012, an increase of 4% on both a reported and underlying basis as compared to 2011, with growth in each of its businesses. The underlying revenue growth was primarily driven by 7% increases in both health and investments. Oliver Wyman’s revenue decreased 1% in 2012 compared to 2011, but increased 3% on an underlying basis.

During 2012, Mercer completed the following three acquisitions:

• February - Mercer acquired the remaining 49% of Yokogawa-ORC, a global mobility firm based in Japan, which was previously accounted for under the equity method, and Pensjon & Finans, a leading Norway-based financial investment and pension consulting firm.

• March - Mercer acquired REPCA, a France-based broking and advisory firm for employer health and benefits plans.

Consulting revenue in 2011 increased 9% compared with 2010, or 5% on an underlying basis. Mercer’s revenue was $4.0 billion in 2011, an increase of 9% or 4% on an underlying basis. The underlying revenue growth was primarily driven by increases of 5% in health and 11% in both talent and investments, partly offset by a 1% decline in retirement. Oliver Wyman’s revenue increased 9% to $1.5 billion in 2011, or 7% on an underlying basis.

Expense

Consulting expenses in 2012 increased 1%, or 2% on an underlying basis. This increase reflects the impact of higher benefits and restructuring costs, including charges of $16 million for the exit activities related to a portion of Mercer's Canadian outsourcing business.

Consulting expenses in 2011 decreased 1% to $4.9 billion, or 4% on an underlying basis. Mercer recorded a $400 million net charge related to the ARMB settlement in 2010. Excluding this charge, expenses increased 4% on an underlying basis. This increase reflected the impact of higher base-salaries and incentive compensation and benefits costs, including higher pension costs, and higher asset-based fees and recoverable expenses from clients.

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Corporate and Other

The following results of Corporate and Other includes the run-off of CARG operations:

(In millions of dollars)	2012			2011			2010
Corporate Advisory and Restructuring Operating Income	$	6		$	9		$	10
Corporate Expense	(203		)	(188		)	(172		)
Total Corporate and Other	$	(197	)	$	(179	)	$	(162	)

Corporate expenses in 2012 were $203 million compared to $188 million in 2011. The increase is primarily due to accelerated amortization of equity awards for retirement eligible senior executives and higher consulting costs associated with corporate initiatives.

Corporate expenses in 2011 were $188 million compared to $172 million in 2010. The increase in Corporate expense reflects higher compensation and pension costs primarily due to executive positions added in corporate and higher outside services costs related to corporate initiatives, such as branding.

The CARG amounts reflect payments received related to the CARG businesses divested in 2008.

Discontinued Operations

As part of the disposal transactions for Putnam and Kroll, the Company provided certain indemnities, primarily related to pre-transaction tax uncertainties and legal contingencies. In accordance with applicable accounting guidance, liabilities were established related to these indemnities at the time of the sales and reflected as a reduction of the gain on disposal. Discontinued operations includes charges or credits resulting from the settlement or resolution of the indemnified matters, as well as adjustments to the liabilities related to such matters. Discontinued operations in 2011 includes credits of$50 millionfrom the resolution of certain legal matters and insurance recoveries, as well as the settlement of tax audits and the expiration of the statutes of limitations related to certain of the indemnified matters, primarily with respect to Putnam.

Marsh's BPO business, previously part of Marsh U.S. Consumer business, provided policy, claims, call center and accounting operations on an outsourced basis to life insurance carriers. Marsh invested in a technology platform that was designed to make the BPO business scalable and more efficient. During 2011, Marsh decided that it would cease investing in the technology platform and instead exit the business via a sale. In the fourth quarter of 2011, management initiated a plan to sell the Marsh BPO business which was completed in August 2012. The Company wrote off capitalized software of the BPO business of $17 million, net of tax, which is included in discontinued operations in 2011.

In the first quarter of 2010, Kroll completed the sale of KLS and on August 3, 2010, the Company completed the sale of Kroll to Altegrity.

Kroll’s results of operations are reported as discontinued operations in the Company’s consolidated statement of income for the portion of 2010 prior to Kroll's disposal. The year ended 2010 also includes the gain on the sale of Kroll and related tax benefits and the loss on the sale of KLS, which includes the tax provision of $36 million on the sale.

The Company’s tax basis in its investment in the stock of Kroll at the time of sale exceeded the recorded amount primarily as a result of prior impairments of goodwill recognized for financial reporting, but not tax. A $265 million deferred tax benefit was recorded in discontinued operations in 2010 as a result of the sale of Kroll.

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Summarized Statements of Income data for discontinued operations is as follows:

For the Years Ended December 31, (In millions of dollars, except per share figures)	2012			2011			2010
Kroll Operations
Revenue	$	—		$	—		$	381
Operating expenses	—			—			345
Operating income	—			—			36
Income tax expense	—			—			16
Income from Kroll operations, net of tax	—			—			20
Other discontinued operations, net of tax	—			(17		)	(7		)
Income (loss) from discontinued operations, net of tax	—			(17		)	13
Disposals of discontinued operations(a)	(2		)	25			58
Income tax expense (credit)(b)	1			(25		)	(235		)
Disposals of discontinued operations, net of tax	(3		)	50			293
Discontinued operations, net of tax	$	(3	)	$	33		$	306
Discontinued operations, net of tax per share
—Basic	$	—		$	0.06		$	0.55
—Diluted	$	—		$	0.06		$	0.55

(a) Includes gain on sale of Kroll and the gain on the sale of KLS in 2010.

(b) The income tax credit related to the disposal of discontinued operations for 2010 primarily represents the recognition of tax benefits related to the sale of Kroll, partly offset by a tax provision of $36 million related to the sale of KLS.

Other Corporate Items

Interest

Interest income earned on corporate funds amounted to $24 million in 2012 compared with $28 million in 2011. The decrease in interest income is due to lower average interest rates compared with the prior year. Interest expense was $181 million in 2012 compared with $199 million in 2011. The decrease is primarily due to lower interest rates on senior notes issued during the second half of 2011 and the first quarter of 2012, compared to the interest rate on notes that matured.

Interest income earned on corporate funds was $28 million in 2011 compared with $20 million in 2010. The increase in interest income was due to the combined effect of higher average invested funds in 2011 and slightly higher average interest rates compared with the prior year. Interest expense was $199 million in 2011 compared with $233 million in 2010. The decrease was primarily due to the maturity of senior notes in the third quarter of 2010, the early extinguishment of a portion of the Company's outstanding notes during the third quarter of 2011 and a lower net interest rate on the Company's debt subject to interest rate swaps. These decreases were partly offset by interest on new senior notes issued during the third quarter of 2011.

Early Extinguishment of Debt

On July 15, 2011 the Company purchased $600 million of the Outstanding Notes, comprised of $330 million of its 2014 Notes and $270 million of its 2015 Notes (collectively, the "Notes"). The Company acquired the Notes at market value plus a tender premium, which exceeded its carrying value and resulted in a charge of approximately $72 million in the third quarter of 2011.

Investment Income (Loss)

In 2012, investment income was $24 million compared with $9 million in 2011. This increase is primarily due to higher mark-to-market gains on private equity fund investments, partly offset by an impairment loss on a debt security of $8 million.

In 2011, investment income was $9 million compared with $43 million in 2010. This decrease primarily reflects the impact of lower private equity gains recorded in 2011 as compared to 2010, the effects of recording an impairment loss in 2011 and a gain on the sale of equity securities in 2010.

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Income Taxes

The Company's consolidated effective tax rate was 29.0%, 30.1% and 26.5% in 2012, 2011 and 2010, respectively. The tax rate in each year reflects foreign operations which are taxed at rates lower than the U.S. statutory tax rate.

The lower effective tax rate attributed to the Company's foreign operations primarily reflects lower corporate tax rates that prevail outside of the U.S., net of the U.S. tax impact from repatriating foreign earnings. In 2012, pre-tax income in the U.K., Canada, Australia and Bermuda accounted for approximately 60% of the Company's total non-U.S. pre-tax income, with effective rates in those countries of 24% (excluding the non-cash deferred tax impact of UK tax legislation enacted in 2012), 27%, 30% and 0%, respectively. Under current U.S. tax law, the Company anticipates its non-U.S. operations will continue to incur taxes at rates below the U.S. federal tax rate of 35%.

The Company's non-U.S. revenue over the past three years has been approximately 55% of total revenue, while the pre-tax income from non-U.S. locations varied from 77% to 138% of total pre-tax income. Although revenue in the United States has been approximately 45% of total revenue, while the Company had gains in its U.S. operations in 2011 and 2012, the Company incurred pre-tax losses in the United States during 2010 as a result of a significant charge from the resolution of the ARMB matter, which is discussed in Note 1 to the Consolidated Financial Statements. The Company had pre-tax income in its U.S. operations in 2011 and 2012.

In addition, as a U.S. domiciled parent holding company, Marsh & McLennan Companies, Inc., is the issuer for essentially all of the Company's external indebtedness, and incurs the related interest expense in the U.S. Finally, most senior executive and oversight functions are conducted in the U.S. and the associated costs are incurred primarily in the United States.

The effective tax rate may vary significantly from period to period for the foreseeable future. It is sensitive to the geographic mix and repatriation of the Company's earnings, which may result in higher or lower tax rates. A proportional increase in U.S. pre-tax income will tend to increase the effective tax rate because U.S. federal and state corporate tax rates often exceed tax rates applicable outside the U.S. Losses in certain jurisdictions cannot be offset by earnings from other operations, and may require valuation allowances that affect the rate, depending on estimates of the realizability of associated deferred tax assets. The effective tax rate is also sensitive to changes in unrecognized tax benefits, including the impact of settled tax audits and expired statutes of limitation.

The realization of deferred tax assets depends on generating future taxable income during the periods in which the tax benefits are deductible or creditable. The Company and Marsh have been profitable globally. However, tax liabilities are determined and assessed on a legal entity and jurisdictional basis. Certain taxing jurisdictions allow or require combined or consolidated tax filings. In the United States, certain groups within the Company, which file on a combined basis, were profitable in 2011 and 2012, but incurred a loss in 2010 as a result of the resolution of the ARMB matter. The Company assessed the realizability of its domestic deferred tax assets, particularly state deferred tax assets of Marsh relating to jurisdictions in which it files separate tax returns, state deferred tax assets of all of the Company's domestic operations related to jurisdictions in which the Company files a unitary or combined state tax return, and foreign tax credit carry-forwards in the Company's consolidated U.S. federal tax return. When making its assessment about the realization of its domestic deferred tax assets at December 31, 2012, the Company considered all available evidence, placing particular weight on evidence that could be objectively verified. The evidence considered included (i) the profitability of the Company's U.S. operations in 2011 and 2012 and the cumulative period from 2010 through 2012, (ii) the nature, frequency, and severity of losses incurred before 2011, (iii) profit trends evidenced by continued improvements in the Company's and Marsh's operating performance, (iv) the non-recurring nature of some of the items that contributed to losses before 2011, (v) the carry-forward periods for the net operating losses ("NOLs") and foreign tax credit carry-forwards, (vi) the sources and timing of future taxable income, giving weight to sources according to the extent to which they can be objectively verified, and (vii) tax planning strategies that would be implemented, if necessary, to accelerate utilization of NOLs. Based on its assessment, the Company concluded that it is more likely than not that a substantial portion of these deferred tax assets are realizable and a valuation allowance was recorded to reduce the domestic deferred tax assets to the amount that the Company believes is more likely than not to be realized. In the event sufficient taxable income is not generated in future periods, additional valuation allowances of up to approximately $270 million could be required relating to these domestic deferred tax assets. The realization of the remaining U.S. federal deferred tax assets is not as sensitive to U.S. profits because it is supported by anticipated repatriation of future annual earnings from the Company's profitable global operations, consistent with the Company's historical practice. In addition, when making its assessment about the realization of its domestic deferred tax assets at December 31, 2012, the Company continued to assess the realizability of deferred tax assets of certain other entities with a history of recent losses, including other U.S. entities that file separate state tax returns and foreign subsidiaries, and recorded valuation allowances as appropriate.

Changes in tax laws or tax rulings may have a significant adverse impact on our effective tax rate. For example,

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proposals for fundamental U.S. international tax reform, if enacted, could have a significant adverse impact on the effective tax rate.

Liquidity and Capital Resources

The Company is organized as a holding company, a legal entity separate and distinct from its operating subsidiaries. As a holding company without significant operations of its own, the Company is dependent upon dividends and other payments from its operating subsidiaries to meet its obligations for paying principal and interest on outstanding debt obligations, for paying dividends to stockholders and for corporate expenses. 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 the Company’s operating subsidiaries located outside of the United States are regularly repatriated to the United States out of annual earnings. At December 31, 2012, the Company had approximately $1.3 billion of cash and cash equivalents in its foreign operations, of which all but approximately $80 million is considered to be permanently invested in those operations to fund foreign investments and working capital needs. The non-U.S. cash and cash equivalents considered permanently reinvested includes approximately $250 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 out of current annual earnings. While management does not foresee a need to repatriate the funds which are currently deemed permanently invested, if facts or circumstances change management could elect to repatriate them, if necessary, which could result in higher effective tax rates in the future.

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

Operating Cash Flows

The Company generated $1.3 billion of cash from operations in 2012 compared with $1.7 billion in 2011. These amounts reflect the net income reported by the Company during those periods, excluding gains or losses from investments and the disposition of businesses, adjusted for non-cash charges and changes in working capital which relate, primarily, to the timing of payments for accrued liabilities or receipts of assets. The reduction in cash generated from operations is primarily due to the cash refunds of U.S. federal income taxes received in 2011, discussed below. Cash generated from the disposition of businesses is included in investing cash flows.

The Company received $322 million in cash refunds of U.S. federal income taxes during the second quarter of 2011, comprising $212 million from carrying back the net capital loss incurred in 2010 from the sale of Kroll and various other assets, and $110 million from the cash settlement of the IRS audit for the periods 2006 through 2008. The audit settlement primarily reflected the allowance of carry back claims for net operating losses and excess foreign tax credits arising in 2008. The impact on the tax provision of these events was reflected in prior periods and did not impact income tax expense reported in 2011.

On June 11, 2010, the Company resolved the litigation brought by the ARMB on behalf of two Alaska benefit plans against Mercer, relating to work in the period 1992 to 2004. Under the terms of the settlement agreement, Mercer paid $500 million, of which $100 million was covered by insurance.

Pension Related Items

During 2012, the Company contributed $124 million to its U.S. pension plans and $389 million to non-U.S. pension plans, which includes discretionary contributions of $100 million to each of the U.S. and the U.K. plans, compared with $24 million for U.S. plans and $320 million for non-U.S. plans in 2011.

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. The pension stabilization provisions included in the "Moving Ahead for Progress in the 21st Century Act", enacted on July 6, 2012, changed the methodology for determining the discount rate used for calculating plan liabilities under ERISA, which determines, in part, the funding requirements. After considering the impact of the pension funding stabilization provisions discussed above, the Company does not expect any contributions will be required to its U.S. tax-qualified plan through the end of 2014. The Company expects to fund approximately $25 million to its non-qualified U.S. pension plans in 2013.

The Company has a large number of non-U.S. defined benefit pension plans, the largest of which are in the U.K.,

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which comprise approximately 82% of non-U.S. plan assets. Contribution rates for non-US 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., contributions to defined benefit pension plans are determined through a negotiation process between the Company and the plans' Trustee that typically occurs every three years in conjunction with the actuarial valuation of the plans. This process is governed by U.K. pension regulations. The assumptions that result from the funding negotiations are different from those used for U.S. GAAP and currently result in a lower funded status than under U.S. GAAP. The current funding plan was based on assumptions (including interest rates, inflation, salary increases and mortality) that reflected market conditions as of year-end 2009, was agreed to in early 2011 and forms the basis for the Company's aggregate contributions to the U.K. plans for 2011 through 2013. In 2012, the Company made required contributions of $289 million to its non-U.S. defined benefit pension plans, including amounts called for under the U.K. funding plan. Additionally, the Company made a $100 million discretionary contribution to the U.K. plans. The valuation of the U.K. pension plan at December 31, 2012 that results from the negotiation process described above will determine funding that is expected to become applicable in 2014. Contributions to the U.K. plans typically comprised of a portion related to the current service cost, that is, the benefits earned by employees in the current year, plus an amount intended to reduce, over time, any deficit determined through the Company's negotiations with the Trustee. The Company anticipates contributing approximately $250 million in March 2013 to pre-fund all or a substantial portion of any deficit funding contributions that may be required from 2014 through 2016 as a result of the negotiations with the Trustee. In the aggregate, the Company expects to fund $623 million to its non-U.S. plans in 2013, comprising $171 million to plans outside of the U.K. (including a $70 million discretionary contribution to a Canadian plan in January 2013) and $452 million to the U.K. plans.

Funding amounts may be influenced by future asset performance, the level of discount rates and other variables impacting the assets and/or liabilities of the plan.

The year-over-year change in the funded status of the Company's pension plans is impacted by the variance between actual and assumed results, particularly with regard to return on assets and changes in the discount rate, as well as the amount of Company contributions, if any. Unrecognized actuarial losses were approximately $1.9 billion and $3.3 billion at December 31, 2012 for the U.S. plans and non-U.S. plans, respectively, compared with $1.7 billion and $3.0 billion at December 31, 2011. The increase is primarily due to the impact of decreases in the discount rates partly offset by actual returns on plan assets in 2012 that were higher than the estimated long-term rate of return on plan assets. In the past several years, the amount of actuarial losses has been significantly impacted, both positively and negatively, by actual asset performance and changes in discount rates. The discount rate used to measure plan liabilities declined in both the U.S. and the U.K. (the Company's two largest plans) in each of the four years for 2009 to 2012. At the end of 2009, the weighted average discount rate for all plans was 6.0%, declining to 5.6%, 4.9% and 4.4% at the end of 2010, 2011 and 2012, respectively. A decline in the discount rate increases the measured plan liability, resulting in actuarial losses. During 2012, the Company's defined benefit pension plan assets had actual returns of 14.1% and 9.9% in the U.S. and U.K., respectively. During 2011, the Company's defined benefit pension plan assets had actual returns of 5.8%, and 4.8% in the U.S. and U.K., respectively; and in 2010, the actual returns were 14.4% in the U.S. and 13.5% in the U.K. In 2012 and 2010, actuarial losses resulting from declines in the discount rate were partly offset by actual asset returns which exceeded the assumed rates of return in each year. In 2011, both the decline in the discount rate and actual asset returns that were lower than the assumed rates of return contributed to the actuarial losses.

Overall, the Company’s pension expense is expected to increase in 2013 by approximately $30 million before the partly-offsetting impacts on bonuses and other incentive compensation and possible movements in foreign exchange rates. The increase in the expected pension expense in 2013 results primarily from a decline in the discount rates used to measure plan liabilities. Partly offsetting this increase is the impact of an increase in plan assets resulting from both investment returns and contributions.The impact of these higher asset levels is partly offset by a reduction in the weighted average assumed rate of return related to the non-U.S. plans.

The Company’s accounting policies for its defined benefit pension plans, including the selection of and sensitivity to assumptions, are discussed below under Management’s Discussion of Critical Accounting Policies. For additional information regarding the Company’s retirement plans, see Note 8 to the consolidated financial statements.

Financing Cash Flows

Net cash used for financing activities was $633 million in 2012 compared with $1.0 billion of net cash used for financing activities in 2011. The Company reduced outstanding debt by approximately $10 million, $100 million and $550 million in 2012, 2011 and 2010, respectively.

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Debt

During the first quarter of 2012, the Company repaid its 6.25% fixed rate $250 million senior notes that matured. The Company used proceeds from the issuance of 2.3% five-year $250 million senior notes in the first quarter to fund the maturing notes.

On July 15, 2011, the Company purchased $600 million of outstanding notes comprised of $330 million of its 2014 Notes and $270 million of its 2015 Notes (collectively, the "Notes"). The Company acquired the Notes at fair value plus a tender premium, which exceeded its carrying value. A charge of approximately $72 million was recorded in the Consolidated Statement of Income in the third quarter of 2011 related to the extinguishment of this debt.

The Company used proceeds from the issuance of 4.80% ten-year $500 million senior notes in the third quarter of 2011 and cash on hand to purchase the Notes.

In February 2013, the Company repaid $250 million of maturing senior notes.

Acquisitions

During 2012, the Company paid $30 million of contingent payments related to acquisitions made in prior periods. Remaining estimated future contingent consideration payments of $63 million for acquisitions completed in 2012 and in prior years are recorded in accounts payable and accrued liabilities or other liabilities in the consolidated balance sheet at December 31, 2012.

In the second quarter of 2011, the Company acquired the remaining minority interest of a previously majority-owned entity for total cash consideration of $8 million.

In the first quarter of 2011, the Company paid deferred purchase consideration of $13 million related to the purchase in 2009 of the minority interest of a previously controlled entity.

Credit Facilities

The Company and certain of its subsidiaries maintain a $1.0 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 requires the Company to maintain certain coverage and leverage ratios which are tested quarterly. There were no borrowings under this facility at December 31, 2012.

In December 2012 the Company closed on a $50 million, 3-year delayed draw term loan facility. The interest rate on this facility is based on LIBOR plus a fixed margin which varies with the Company's credit ratings. The facility requires the Company to maintain coverage ratios and leverage ratios consistent with the revolving credit facility discussed above. There were no borrowings under this facility at December 31, 2012.

The Company’s senior debt is currently rated Baa2 by Moody’s and BBB by Standard & Poor’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.

The Company also maintains other credit facilities, guarantees and letters of credit with various banks, primarily related to operations located outside the United States, aggregating $247 million at December 31, 2012 and $248 million at December 31, 2011. There were no outstanding borrowings under these facilities.

Share Repurchases

During 2012, the Company repurchased approximately 6.9 million shares of its common stock for total consideration of approximately $230 million at an average price per share of $33.36. The Company remains authorized to repurchase additional shares of its common stock up to a value of $323 million. There is no time limit on this authorization. During 2011, the Company repurchased approximately 12.3 million shares of its common stock for total consideration of approximately $361 million at an average price per share of $29.44.

Dividends

The Company paid total dividends of $497 million in 2012 ($0.90 per share), $480 million in 2011 ($0.86 per share) and $452 million in 2010 ($0.81 per share).

Investing Cash Flows

Net cash used for investing activities amounted to $583 million in 2012 compared with $457 million used for investing activities in 2011. The Company made 15 acquisitions in 2012. Cash used for these acquisitions, net of

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cash acquired was $230 million. In addition, in 2012, the Company paid $59 million of deferred purchase consideration related to acquisitions made in prior years and $3 million for the purchase of other intangible assets. Remaining deferred cash payments of approximately $42 million for acquisitions completed in 2012 and in prior years are recorded in accounts payable and accrued liabilities or other liabilities in the consolidated balance sheet at December 31, 2012.

The Company made 12 acquisitions in 2011. Cash used for these acquisitions, net of cash acquired, was $160 million compared with $427 million used for acquisitions in 2010. In addition, the Company recorded a liability of $33 million for estimated contingent purchase consideration related to the acquisitions completed in 2011. In 2011, the Company also paid $11 million for deferred purchase consideration, $62 million into escrow for future acquisitions and $4 million for the purchase of other intangible assets. In 2010, in addition to the cash paid, the Company issued approximately 7.6 million shares of common stock with an acquisition date value of $183 million, and also paid $60 million of deferred purchase consideration, $3 million for other intangible assets and $2 million of contingent purchase consideration related to acquisitions made in prior years.

Cash provided by the sale of securities was $6 million for the periods ended December 31, 2012 and 2011, respectively.

The Company’s additions to fixed assets and capitalized software, which amounted to $320 million in 2012 and $280 million in 2011, primarily relate to computer equipment purchases, the refurbishing and modernizing of office facilities and software development costs.

The Company has committed to potential future investments of approximately $40 million in private equity funds that invest primarily in financial services companies. Substantially all invested assets in Trident II were harvested in the first quarter of 2013 and the fund is expected to wind down. The Company expects to receive approximately $100 million related to its Trident II investment in 2013.

Commitments and Obligations

The following sets forth the Company’s future contractual obligations by the types identified in the table below as of December 31, 2012:

	Payment due by Period
Contractual Obligations (In millions of dollars)	Total		Within 1 Year		1-3 Years		4-5 Years		After 5 Years
Current portion of long-term debt	$	260	$	260	$	—	$	—	$	—
Long-term debt	2,664		—		821		273		1,570
Interest on long-term debt	1,309		159		287		209		654
Net operating leases	2,489		355		583		433		1,118
Service agreements	374		136		120		78		40
Other long-term obligations	144		32		103		7		2
Purchase commitments	47		32		15		—		—
Total	$	7,287	$	974	$	1,929	$	1,000	$	3,384

The above does not include the liability for unrecognized tax benefits of $117 million as the Company is unable to reasonably predict the timing of settlement of these liabilities, other than approximately $12 million that may become payable during 2013. The above does not include the indemnified liabilities discussed in Note 15 as the Company is unable to reasonably predict the timing of settlement of these liabilities. The above does not include net pension liabilities of approximately $1.8 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 amounts of estimated future benefits payments to be made from plan assets are disclosed in Note 8 to the consolidated financial statements. In 2013, the Company expects to contribute approximately $25 million and $623 million to its U.S. and non-U.S. pension plans, respectively.

Management’s Discussion of Critical Accounting Policies

The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“GAAP”) requires management to make estimates and judgments that affect reported amounts of assets, liabilities, revenue and expenses, and disclosure of contingent assets and liabilities. Management considers the policies discussed below to be critical to understanding the Company’s financial statements because their application places the most significant demands on management’s judgment, and requires management to make

16

estimates about the effect of matters that are inherently uncertain. Actual results may differ from those estimates.

Legal and Other Loss Contingencies

The Company and its subsidiaries are subject to numerous claims, lawsuits and proceedings including claims for errors and omissions. GAAP requires that a liability be recorded when a loss is both probable and reasonably estimable. Significant management judgment is required to apply this guidance. The Company utilizes case level reviews by inside and outside counsel, an internal actuarial analysis and other analyses to estimate potential losses. 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. Given the unpredictability of E&O claims and of litigation that could flow from them, it is possible that an adverse outcome in a particular matter could have a material adverse effect on the Company’s businesses, results of operations, financial condition or cash flow in a given quarterly or annual period.

In addition, to the extent that insurance coverage is available, significant management judgment is required to determine the amount of recoveries that are probable of collection under the Company’s various insurance programs.

Retirement Benefits

The Company maintains qualified and non-qualified defined benefit pension and defined contribution plans for its eligible U.S. employees and a variety of defined benefit and defined contribution plans for its eligible non-U.S. employees. The Company’s policy for funding its tax qualified defined benefit retirement plans is to contribute amounts at least sufficient to meet the funding requirements set forth in U.S. and applicable foreign laws.

The Company recognizes the funded status of its over-funded defined benefit pension and retiree medical plans as a net benefit plan asset and its unfunded and underfunded plans as a net benefit plan liability. The gains or losses and prior service costs or credits that have not been recognized as components of net periodic costs are recorded as a component of Accumulated Other Comprehensive Income (“AOCI”), net of tax, in the Company’s consolidated balance sheets. The gains and losses that exceed specified corridors are amortized prospectively out of AOCI over a period that approximates the average remaining service period of active employees, or for plans in which substantially all the participants are inactive, over the remaining life expectancy of the inactive employees.

The determination of net periodic pension cost is based on a number of assumptions, including an expected long-term rate of return on plan assets, the discount rate, mortality and assumed rate of salary increase. Significant assumptions used in the calculation of net periodic pension costs and pension liabilities are disclosed in Note 8 to the consolidated financial statements. The Company believes the assumptions for each plan are reasonable and appropriate and will continue to evaluate assumptions at least annually and adjust them as appropriate. Based on its current assumptions, the Company expects pension expense in 2013 to increase approximately $30 million compared with 2012 before partly-offsetting impacts of bonuses and other incentive compensation and possible movements in foreign exchange rates.

Future pension expense or credits will depend on plan provisions, future investment performance, future assumptions and various other factors related to the populations participating in the pension plans. Holding all other assumptions constant, a half-percentage point change in the rate of return on plan assets and discount rate assumptions would affect net periodic pension cost for the U.S. and U.K. plans, which together comprise approximately 88% of total pension plan liabilities, as follows:

	0.5 Percentage Point Increase						0.5 Percentage Point Decrease
(In millions of dollars)	U.S.			U.K.			U.S.		U.K.
Assumed Rate of Return on Plan Assets	$	(18	)	$	(35	)	$	18	$	35
Discount Rate	$	(20	)	$	(25	)	$	20	$	25

Changing the discount rate and leaving the other assumptions constant may not be representative of the impact on expense, because the long-term rates of inflation and salary increases are often correlated with the discount rate. Changes in these assumptions will not necessarily have a linear impact on the net periodic pension cost.

The Company contributes to certain health care and life insurance benefits provided to its retired employees. The cost of these post-retirement benefits for employees in the U.S. is accrued during the period up to the date employees are eligible to retire, but is funded by the Company as incurred. The key assumptions and sensitivity to changes in the assumed health care cost trend rate are discussed in Note 8 to the consolidated financial statements.

17

Income Taxes

The Company's tax rate reflects its income, statutory tax rates and tax planning in the various jurisdictions in which it operates. Significant judgment is required in determining the annual effective tax rate and in evaluating uncertain tax positions. The Company reports a liability for unrecognized tax benefits resulting from uncertain tax positions taken or expected to be taken in a tax return. The evaluation of a tax position is a two-step process. The first step involves recognition. The Company determines whether it is more likely than not that a tax position will be sustained upon tax examination, including resolution of any related appeals or litigation, based on only the technical merits of the position. The technical merits of a tax position derive from both statutory and judicial authority (legislation and statutes, legislative intent, regulations, rulings, and case law) and their applicability to the facts and circumstances of the tax position. If a tax position does not meet the more likely than not recognition threshold, the benefit of that position is not recognized in the financial statements. The second step is measurement. A tax position that meets the more likely than not recognition threshold is measured to determine the amount of benefit to recognize in the financial statements. The tax position is measured as the largest amount of benefit that is greater than 50 percent likely of being realized upon ultimate resolution with a taxing authority.

Uncertain tax positions are evaluated based upon the facts and circumstances that exist at each reporting period and involve significant management judgment. Subsequent changes in judgment based upon new information may lead to changes in recognition, derecognition, and measurement. Adjustments may result, for example, upon resolution of an issue with the taxing authorities, or expiration of a statute of limitations barring an assessment for an issue.

Tax law requires items be included in the Company's tax returns at different times than the items are reflected in the financial statements. As a result, the annual tax expense reflected in the consolidated statements of income is different than that reported in the tax returns. Some of these differences are permanent, such as expenses that are not deductible in the returns, and some differences are temporary and reverse over time, such as depreciation expense. Temporary differences create deferred tax assets and liabilities. Deferred tax liabilities generally represent tax expense recognized in the financial statements for which payment has been deferred, or expense for which a deduction has been taken already in the tax return but the expense has not yet been recognized in the financial statements. Deferred tax assets generally represent items that can be used as a tax deduction or credit in tax returns in future years for which a benefit has already been recorded in the financial statements. In assessing the need for and amount of a valuation allowance for deferred tax assets, the Company considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized and adjusts the valuation allowance accordingly. The Company evaluates all significant available positive and negative evidence, including the existence of losses in recent years and its forecast of future taxable income by jurisdiction, in assessing the need for a valuation allowance. The Company also considers tax-planning strategies that would result in realization of deferred tax assets, and the presence of taxable income in prior period tax filings in jurisdictions that allow for the carryback of tax attributes pursuant to the applicable tax law. The underlying assumptions the Company uses in forecasting future taxable income require significant judgment and take into account the Company's recent performance. The ultimate realization of deferred tax assets is dependent on the generation of future taxable income during the periods in which temporary differences or carry-forwards are deductible or creditable. Valuation allowances are established for deferred tax assets when it is estimated that it is more likely than not that future taxable income will be insufficient to fully use a deduction or credit in that jurisdiction.

Fair Value Determinations

Investment Valuation—The Company holds investments in private companies as well as certain private equity funds. Certain investments, primarily investments in private equity funds, are accounted for using the equity method. Although not directly recorded in the Company’s consolidated balance sheets, the Company defined benefit pension plans hold investments of approximately $12.2 billion. The fair value of these investments determines, in part, the over-or under-funded status of those plans, which is included in the Company’s consolidated balance sheets. The Company periodically reviews the carrying value of its investments to determine if any valuation adjustments are appropriate under the applicable accounting pronouncements. The Company bases its review on the facts and circumstances as they relate to each investment. Fair value of investments in private equity funds is determined by the funds’ investment managers. Factors considered in determining the fair value of private equity investments include: implied valuation of recently completed financing rounds that included sophisticated outside investors; performance multiples of comparable public companies; restrictions on the sale or disposal of the investments; trading characteristics of the securities; and the relative size of the holdings in comparison to other private investors and the public market float. In those instances where quoted market prices are not available, particularly for equity holdings in private companies, or formal restrictions limit the sale of

18

securities, significant management judgment is required to determine the appropriate value of the Company’s investments. The Company reviews with the fund manager the appropriateness of valuation results for significant private equity investments.

Goodwill Impairment Testing—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 goodwill impairment test for each of its reporting units during the third quarter of each year. The Company adopted new accounting guidance in the third quarter of 2011. Under this guidance, a company may first assess qualitative factors to determine whether it is necessary to perform the goodwill impairment test. If, as a result of this qualitative assessment, a company determines the fair value of a reporting unit is more likely than not lower than its carrying value, a step 1 impairment assessment must be performed. The Company considered the totality of numerous factors, which included that the fair value of each reporting unit exceeded its carrying value by a substantial margin in its most recent estimate of reporting unit fair values, whether significant acquisitions or dispositions occurred which might alter the fair values 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.

Based on its qualitative evaluation, the Company concluded that a two-step goodwill impairment test was not required in 2012.

Share-based Payment

The guidance for accounting for share-based payments requires, among other things, that the estimated fair value of stock options be charged to earnings. Significant management judgment is required to determine the appropriate assumptions for inputs such as volatility and expected term necessary to estimate option values. In addition, management judgment is required to analyze the terms of the plans and awards granted thereunder to determine if awards will be treated as equity awards or liability awards, as defined by the accounting guidance.

As of December 31, 2012, there was $18 million of unrecognized compensation cost related to stock option awards. The weighted-average periods over which the costs are expected to be recognized is 1.3 years. Also as of December 31, 2012, there was $135 million of unrecognized compensation cost related to the Company’s restricted stock, restricted stock unit and deferred stock unit awards.

See Note 9 to the consolidated financial statements for additional information regarding accounting for share-based payments.

New Accounting Pronouncements

Note 1 to the consolidated financial statements contains a summary of the Company’s significant accounting policies, including a discussion of recently issued accounting pronouncements and their impact or potential future impact on the Company’s financial results, if determinable, under the sub-heading "New Accounting Pronouncements" .

19

EX-99.2

EXHIBIT 99.2

AMENDED ITEM 8.    FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA OF MMC'S ANNUAL REPORT ON FORM 10-K FOR THE FISCAL YEAR ENDED DECEMBER 31, 2012.

MARSH & McLENNAN COMPANIES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME

For the Years Ended December 31,
(In millions, except per share figures)	2012			2011			2010
Revenue	$	11,924		$	11,526		$	10,550
Expense:
Compensation and benefits	7,134			6,969			6,465
Other operating expenses	2,961			2,919			3,146
Operating expenses	10,095			9,888			9,611
Operating income	1,829			1,638			939
Interest income	24			28			20
Interest expense	(181		)	(199		)	(233		)
Cost of extinguishment of debt	—			(72		)	—
Investment income	24			9			43
Income before income taxes	1,696			1,404			769
Income tax expense	492			422			204
Income from continuing operations	1,204			982			565
Discontinued operations, net of tax	(3		)	33			306
Net income before non-controlling interests	1,201			1,015			871
Less: Net income attributable to non-controlling interests	25			22			16
Net income attributable to the Company	$	1,176		$	993		$	855
Basic net income per share – Continuing operations	$	2.16		$	1.76		$	1.01
– Net income attributable to the Company	$	2.16		$	1.82		$	1.56
Diluted net income per share – Continuing operations	$	2.13		$	1.73		$	1.00
–Net income attributable to the Company	$	2.13		$	1.79		$	1.55
Average number of shares outstanding – Basic	544			542			540
– Diluted	552			551			544
Shares outstanding at December 31,	545			539			541

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

1

MARSH & McLENNAN COMPANIES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

For the Years Ended December 31, (In millions)	2012			2011			2010
Net income before non-controlling interests	$	1,201		$	1,015		$	871
Other comprehensive income (loss), before tax:
Foreign currency translation adjustments	177			(100		)	(34		)
Unrealized investment loss	(1		)	(9		)	(17		)
Loss related to pension/post-retirement plans	(447		)	(1,114		)	(146		)
Other comprehensive loss, before tax	(271		)	(1,223		)	(197		)
Income tax credit on other comprehensive loss	(152		)	(335		)	(68		)
Other comprehensive loss, net of tax	(119		)	(888		)	(129		)
Comprehensive income	1,082			127			742
Less: Comprehensive income attributable to non-controlling interests	25			22			16
Comprehensive income attributable to the Company	$	1,057		$	105		$	726

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

2

MARSH & McLENNAN COMPANIES, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

December 31,
(In millions, except share figures)	2012			2011
ASSETS
Current assets:
Cash and cash equivalents	$	2,301		$	2,113
Receivables
Commissions and fees	2,858			2,676
Advanced premiums and claims	62			86
Other	244			249
	3,164			3,011
Less-allowance for doubtful accounts and cancellations	(106		)	(105		)
Net receivables	3,058			2,906
Current deferred tax assets	410			376
Other current assets	194			253
Total current assets	5,963			5,648
Goodwill and intangible assets	7,261			6,963
Fixed assets, net	809			804
Pension related assets	260			39
Deferred tax assets	1,223			1,205
Other assets	772			795
	$	16,288		$	15,454
LIABILITIES AND EQUITY
Current liabilities:
Short-term debt	$	260		$	260
Accounts payable and accrued liabilities	1,721			2,016
Accrued compensation and employee benefits	1,473			1,400
Accrued income taxes	110			63
Total current liabilities	3,564			3,739
Fiduciary liabilities	3,992			4,082
Less – cash and investments held in a fiduciary capacity	(3,992		)	(4,082		)
	—			—
Long-term debt	2,658			2,668
Pension, postretirement and postemployment benefits	2,094			1,655
Liabilities for errors and omissions	460			468
Other liabilities	906			984
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 December 31, 2012 and December 31, 2011	561			561
Additional paid-in capital	1,107			1,156
Retained earnings	8,628			7,949
Accumulated other comprehensive loss	(3,307		)	(3,188		)
Non-controlling interests	64			57
	7,053			6,535
Less – treasury shares, at cost, 15,133,774 shares at December 31, 2012 and 21,463,226 shares at December 31, 2011	(447		)	(595		)
Total equity	6,606			5,940
	$	16,288		$	15,454

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

3

MARSH & McLENNAN COMPANIES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

For the Years Ended December 31,
(In millions)	2012			2011			2010
Operating cash flows:
Net income before non-controlling interests	$	1,201		$	1,015		$	871
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization of fixed assets and capitalized software	277			267			291
Amortization of intangible assets	72			65			66
Intangible asset impairment	8			—			—
Adjustments to acquisition related contingent consideration liability	(44		)	—			—
Charge for early extinguishment of debt	—			72			—
Provision for deferred income taxes	96			178			16
Gain on investments	(24		)	(8		)	(40		)
Loss (gain) on disposition of assets	23			35			(17		)
Stock option expense	26			21			18
Changes in assets and liabilities:
Net receivables	(144		)	143			(216		)
Other current assets	(37		)	(225		)	51
Other assets	(177		)	(94		)	(216		)
Accounts payable and accrued liabilities	(210		)	108			(55		)
Accrued compensation and employee benefits	72			107			(13		)
Accrued income taxes	44			1			32
Other liabilities	174			32			(145		)
Effect of exchange rate changes	(35		)	(12		)	79
Net cash provided by operations	1,322			1,705			722
Financing cash flows:
Purchase of treasury shares	(230		)	(361		)	(86		)
Proceeds from issuance of debt	248			496			—
Repayments of debt	(259		)	(11		)	(559		)
Payments for early extinguishment of debt	—			(672		)	—
Purchase of non-controlling interests	—			(21		)	(15		)
Shares withheld for taxes on vested units – treasury shares	(97		)	(93		)	(59		)
Issuance of common stock	248			162			41
Payments of contingent consideration for acquisitions	(30		)	(16		)	—
Distributions to non-controlling interests	(16		)	(11		)	—
Dividends paid	(497		)	(480		)	(452		)
Net cash used for financing activities	(633		)	(1,007		)	(1,130		)
Investing cash flows:
Capital expenditures	(320		)	(280		)	(271		)
Net sales of long-term investments	20			62			91
Proceeds from sales of fixed assets	6			3			6
Dispositions	—			—			1,202
Acquisitions	(292		)	(237		)	(492		)
Other, net	3			(5		)	(1		)
Net cash (used for) provided by investing activities	(583		)	(457		)	535
Effect of exchange rate changes on cash and cash equivalents	82			(22		)	(10		)
Increase in cash and cash equivalents	188			219			117
Cash and cash equivalents at beginning of period	2,113			1,894			1,777
Cash and cash equivalents at end of period	$	2,301		$	2,113		$	1,894

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

4

MARSH & McLENNAN COMPANIES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF EQUITY

For the Years Ended December 31,
(In millions, except per share figures)	2012			2011			2010
COMMON STOCK
Balance, beginning and end of year	$	561		$	561		$	561
ADDITIONAL PAID-IN CAPITAL
Balance, beginning of year	$	1,156		$	1,185		$	1,211
Change in accrued stock compensation costs	(16		)	(13		)	6
Issuance of shares under stock compensation plans and employee stock purchase plans and related tax impact	(34		)	(14		)	(17		)
Purchase of subsidiary shares from non-controlling interests	1			(2		)	—
Issuance of shares for acquisitions	—			—			(15		)
Balance, end of period	$	1,107		$	1,156		$	1,185
RETAINED EARNINGS
Balance, beginning of year	$	7,949		$	7,436		$	7,033
Net income attributable to the Company	1,176			993			855
Dividend equivalents declared - (per share amounts: $0.90 in 2012, $0.86 in 2011, and $0.81 in 2010)	(8		)	(14		)	(15		)
Dividends declared – (per share amounts: $0.90 in 2012, $0.86 in 2011, and $0.81 in 2010)	(489		)	(466		)	(437		)
Balance, end of period	$	8,628		$	7,949		$	7,436
ACCUMULATED OTHER COMPREHENSIVE LOSS
Balance, beginning of year	$	(3,188	)	$	(2,300	)	$	(2,171	)
Comprehensive loss, net of tax	(119		)	(888		)	(129		)
Balance, end of period	$	(3,307	)	$	(3,188	)	$	(2,300	)
TREASURY SHARES
Balance, beginning of year	$	(595	)	$	(514	)	$	(806	)
Issuance of shares under stock compensation plans and employee stock purchase plans	378			280			180
Issuance of shares for acquisitions	—			—			198
Purchase of treasury shares	(230		)	(361		)	(86		)
Balance, end of period	$	(447	)	$	(595	)	$	(514	)
NON-CONTROLLING INTERESTS
Balance, beginning of year	$	57		$	47		$	35
Net income attributable to non-controlling interests	25			22			16
Distributions	(16		)	(5		)	—
Other changes	(2		)	(7		)	(4		)
Balance, end of period	$	64		$	57		$	47
TOTAL EQUITY	$	6,606		$	5,940		$	6,415

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

5

MARSH & McLENNAN COMPANIES, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.    Summary of Significant Accounting Policies

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

Effective January 1, 2013, the Corporate Benefits and Association businesses, previously part of Marsh's U.S. Consumer operations in the Risk and Insurance Services segment, were transferred to Mercer. Accordingly, these businesses are now part of the Consulting segment. The segment data in Note 6 and Note 16 has been updated to reflect this transfer. See Note 16 for additional details about the impact of these reclassifications.

The Risk and Insurance Services segment provides risk management 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 two main business groups. Mercer provides consulting expertise, advice, services and solutions in the areas of talent, health, retirement and investments. 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 4 to the consolidated financial statements.

On August 3, 2010, the Company completed the sale of Kroll, the Company’s former Risk Consulting & Technology segment, to Altegrity, Inc. (“Altegrity”) for cash consideration of $1.13 billion. In the first quarter of 2010, Kroll completed the sale of Kroll Laboratory Specialists (“KLS”). The gain on the sale of Kroll and related tax benefits and the after-tax loss on the sale of KLS, along with Kroll’s, and KLS’s 2010 results of operations are included in discontinued operations in 2010.

With the sale of Kroll in August 2010, along with other dispositions between 2008 and 2010, the Company has divested its entire Risk Consulting and Technology Segment. The Company has “continuing involvement” in certain Corporate Advisory and Restructuring businesses (“CARG”) that were disposed of in 2008. The runoff of the CARG businesses is being managed by the Company's corporate departments and financial results of these entities are included in “Corporate” for segment reporting purposes.

Principles of Consolidation:  The accompanying consolidated financial statements include all wholly-owned and majority-owned subsidiaries. All significant inter-company transactions and balances have been eliminated.

Fiduciary Assets and Liabilities:  In its capacity as an insurance broker or agent, the Company generally 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 $39 million, $47 million and $45 million in 2012, 2011 and 2010, respectively. The Consulting segment recorded fiduciary interest income of $4 million in each of 2012 , 2011 and 2010. 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 $9.1 billion and $9 billion at December 31, 2012 and 2011, respectively. 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. Net

6

uncollected premiums and claims and the related payables are, therefore, 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.

Mercer manages approximately $16 billion of assets in trusts or funds for which Mercer’s management or trustee fee is considered a variable interest. Mercer is not the primary beneficiary of these trusts or funds. Mercer’s only variable interest in any of these trusts or funds is its unpaid fees, if any. Mercer’s maximum exposure to loss of its interests is, therefore, limited to collection of its fees.

Revenue:  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 are 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 is provided based on historic and current data on cancellations. 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.

As part of the sale of MMC Capital in 2005, the Company retained the right to receive certain performance fees related to the Trident II and Trident III private equity partnerships. The Company recognizes performance fee income when such fees are no longer subject to forfeiture, which may take a number of years to resolve. The Company has deferred the recognition of income related to such performance fees of $78 million and $74 million at December 31, 2012 and 2011, respectively. This income is based on the investment performance over the life of each private equity fund, and future declines in fund performance from current levels may result in the forfeiture of such revenue. In the first quarter of 2013, Trident II sold substantially all of the remaining assets of the fund and the fund will wind down. As a result, approximately $15 million of the deferred performance fees will be recognized as part of investment income.

Consulting revenue includes fees paid by clients for advice and services and commissions from insurance companies for the placement of individual and group contracts. Fee revenue for engagements where remuneration is based on time plus out-of-pocket expenses is recognized based on the amount of time consulting professionals expend on the engagement. For fixed fee engagements, revenue is recognized using a proportional performance model. Revenue from insurance commissions not subject to a fee arrangement is recorded over the effective period of the applicable policies. Revenues for asset based fees are recognized on an accrual basis by applying the daily/monthly rate as contractually agreed with the client to the applicable net asset value. On a limited number of engagements, performance fees may also be earned for achieving certain pre-determined performance criteria. Such fees are recognized when the performance criteria have been achieved and agreed to by the client. Expenses incurred by professional staff in the generation of revenue are billed to the client and included in revenue.

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 $250 million related to regulatory requirements outside the U.S. or as collateral under captive insurance arrangements.

Fixed Assets:  Fixed assets are stated at cost less accumulated depreciation and amortization. Expenditures for improvements are capitalized. Upon sale or retirement, the cost and related accumulated depreciation and amortization are removed from the accounts and any gain or loss is reflected in income. Expenditures for maintenance and repairs are charged to operations as incurred.

Depreciation of buildings, building improvements, furniture, and equipment is provided on a straight-line basis over the estimated useful lives of these assets. Furniture and equipment is depreciated over

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periods ranging from three to ten years. Leasehold improvements are amortized on a straight-line basis over the periods covered by the applicable leases or the estimated useful life of the improvement, whichever is less. Buildings are depreciated over periods ranging from thirty to forty years. The Company periodically reviews long-lived assets for impairment whenever events or changes indicate that the carrying value of assets may not be recoverable.

The components of fixed assets are as follows:

December 31,
(In millions of dollars)	2012			2011
Furniture and equipment	$	1,168		$	1,101
Land and buildings	412			405
Leasehold and building improvements	811			767
	2,391			2,273
Less-accumulated depreciation and amortization	(1,582		)	(1,469		)
	$	809		$	804

Investment Securities:  The Company holds investments primarily in private companies and certain private equity funds.

Certain investments, primarily investments in private equity funds, are accounted for under the equity method 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 securities within the fund are carried at fair value. The Company records its proportionate share of the change in fair value of the funds in earnings which amounted to gains of $33 million, $10 million and $32 million in 2012, 2011 and 2010, respectively. Securities recorded using the equity method are included in other assets in the consolidated balance sheets.

The Company has an investment in Trident II limited partnership, a private equity investment fund. At December 31, 2012, the Company’s investment in Trident II was approximately $78 million, reflected in other assets in the consolidated balance sheet. In the first quarter of 2013, Trident II sold substantially all remaining assets and the fund will wind down. The Company expects to receive approximately $100 million in cash proceeds related to this sale in 2013.

Gains or losses recognized in earnings from the investment securities, including the performance fees discussed above, are included in investment income in the consolidated statements of income. Costs related to management of the Company’s investments, including incentive compensation partially derived from investment income and (loss), are recorded in operating expenses.

Goodwill and Other Intangible Assets:  Goodwill represents acquisition costs in excess of the fair value of net assets acquired. Goodwill is reviewed at least annually for impairment. The Company performs an annual impairment test for each of its reporting units during the third quarter of each year. When a step 1 test is performed, fair values of the reporting units are estimated using either a market approach or a discounted cash flow model. Carrying values for the reporting units are based on balances at the prior quarter end and include directly identified assets and liabilities as well as an allocation of those assets and liabilities not recorded at the reporting unit level. As discussed in Note 6, the Company assesses qualitative factors to determine if a step 1 assessment is necessary. Other intangible assets, which primarily consist of customer lists, 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 Company had no indefinite lived identified intangible assets at December 31, 2012 or 2011.

Capitalized Software Costs:  The Company capitalizes certain costs to develop, purchase or modify software for the internal use of the Company. These costs are amortized on a straight-line basis over periods ranging from three to ten years. Costs incurred during the preliminary project stage and post implementation stage, are expensed as incurred. Costs incurred during the application development stage are capitalized. Costs related to updates and enhancements are only capitalized if they will result in

8

additional functionality. Capitalized computer software costs of $278 million and $244 million, net of accumulated amortization of $691 million and $619 million at December 31, 2012 and 2011, respectively, are included in other assets in the consolidated balance sheets.

Legal and Other Loss Contingencies:  The Company and its subsidiaries are subject to numerous claims, lawsuits and proceedings including claims for errors and omissions ("E&O"). GAAP requires that a liability be recorded when a loss is both probable and reasonably estimable. Significant management judgement is required to apply this guidance. The Company utilizes case level reviews by inside and outside counsel, an internal actuarial analysis and other analyses to estimate potential losses. 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. Given the unpredictability of E&O claims and of litigation that could flow from them, it is possible that an adverse outcome in a particular matter could have a material adverse effect on the Company’s businesses, results of operations, financial condition or cash flow in a given quarterly or annual period.

In addition, to the extent that insurance coverage is available, significant management judgment is required to determine the amount of recoveries that are probable of collection under the Company’s various insurance programs.

The legal and other contingent liabilities described above are not discounted.

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

The Company reports a liability for unrecognized tax benefits resulting from uncertain tax positions taken or expected to be taken in a tax return. The evaluation of a tax position is a two-step process. The first step involves recognition. The Company determines whether it is more likely than not that a tax position will be sustained upon tax examination, including resolution of any related appeals or litigation, based on only the technical merits of the position. The technical merits of a tax position derive from both statutory and judicial authority (legislation and statutes, legislative intent, regulations, rulings, and case law) and their applicability to the facts and circumstances of the tax position. If a tax position does not meet the more likely than not recognition threshold, the benefit of that position is not recognized in the financial statements. The second step is measurement. A tax position that meets the more likely than not recognition threshold is measured to determine the amount of benefit to recognize in the financial statements. The tax position is measured as the largest amount of benefit that is greater than 50 percent likely of being realized upon ultimate resolution with a taxing authority.

Uncertain tax positions are evaluated based upon the facts and circumstances that exist at each reporting period. Subsequent changes in judgment based upon new information may lead to changes in recognition, derecognition, and measurement. Adjustments may result, for example, upon resolution of an issue with the taxing authorities, or expiration of a statute of limitations barring an assessment for an issue. The Company recognizes interest and penalties, if any, related to unrecognized tax benefits in income tax expense.

Tax law requires items be included in the Company's tax returns at different times than the items are reflected in the financial statements. As a result, the annual tax expense reflected in the consolidated statements of income is different than that reported in the income tax returns. Some of these differences are permanent, such as expenses that are not deductible in the returns, and some differences are temporary and reverse over time, such as depreciation expense. Temporary differences create deferred tax assets and liabilities. Deferred tax assets generally represent items that can be used as a tax deduction or credit in tax returns in future years for which benefit has already been recorded in the financial statements. Valuation allowances are established for deferred tax assets when it is estimated that future taxable income will be insufficient to use a deduction or credit in that jurisdiction. Deferred tax liabilities generally represent tax expense recognized in the financial statements for which payment has been deferred, or expense for which a deduction has been taken already in the tax return but the expense has not yet been recognized in the financial statements.

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Derivative Instruments:  All derivatives, whether designated in hedging relationships or not, are recorded on the balance sheet at fair value. If the derivative is designated as a fair value hedge, the changes in the fair value of the derivative and of the hedged item attributable to the hedged risk are recognized in earnings. If the derivative is designated as a cash flow hedge, the effective portions of changes in the fair value of the derivative are recorded in other comprehensive income and are recognized in the income statement when the hedged item affects earnings. Changes in the fair value attributable to the ineffective portion of cash flow hedges are recognized in earnings.

Concentrations of Credit Risk:  Financial instruments which potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents, commissions and fees receivable and insurance recoverables. The Company maintains a policy providing for the diversification of cash and cash equivalent investments and places its investments in a large number of high quality financial institutions to limit the amount of credit risk exposure. Concentrations of credit risk with respect to receivables are generally limited due to the large number of clients and markets in which the Company does business, as well as the dispersion across many geographic areas.

Per Share Data: Under the accounting guidance which applies to the calculation of earnings per share (“EPS”) for share-based payment awards with rights to dividends or dividend equivalents, unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and should be included in the computation of basic and dilutive EPS using the two-class method.

Basic net income per share attributable to the Company and income from continuing operations per share are calculated by dividing the respective after-tax income attributable to common shares by the weighted average number of outstanding shares of the Company’s common stock.

Diluted net income per share attributable to the Company and income from continuing operations per share are calculated by dividing the respective after-tax income attributable to common shares 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 (excluding those that are considered participating securities). The diluted earnings per share calculation reflects the more dilutive effect of either (a) the two-class method that assumes that the participating securities have not been exercised or (b) the treasury stock method. Reconciliation of the applicable income components used for diluted earnings per share and basic weighted average common shares outstanding to diluted weighted average common shares outstanding is presented below.

Basic EPS Calculation - Continuing Operations
(In millions, except per share figures)	2012		2011		2010
Net income from continuing operations	$	1,204	$	982	$	565
Less: Net income attributable to non-controlling interests	25		22		16
Net income from continuing operations attributable to the Company	1,179		960		549
Less: Portion attributable to participating securities	2		6		6
Net income attributable to common shares for basic earnings per share	$	1,177	$	954	$	543
Basic weighted average common shares outstanding	544		542		540

Basic EPS Calculation - Net Income
(In millions, except per share figures)	2012		2011		2010
Net income attributable to the Company	$	1,176	$	993	$	855
Less: Portion attributable to participating securities	2		6		11
Net income attributable to common shares for basic earnings per share	$	1,174	$	987	$	844
Basic weighted average common shares outstanding	544		542		540

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Diluted EPS Calculation - Continuing Operations
(In millions, except per share figures)	2012		2011		2010
Net income from continuing operations	$	1,204	$	982	$	565
Less: Net income attributable to non-controlling interests	25		22		16
Net income from continuing operations attributable to the Company	1,179		960		549
Less: Portion attributable to participating securities	2		6		6
Net income attributable to common shares for diluted earnings per share	$	1,177	$	954	$	543
Basic weighted average common shares outstanding	544		542		540
Dilutive effect of potentially issuable common shares	8		9		4
Diluted weighted average common shares outstanding	552		551		544
Average stock price used to calculate common stock equivalents	$	33.10	$	29.40	$	23.76

Diluted EPS Calculation - Net Income
(In millions, except per share figures)	2012		2011		2010
Net income attributable to the Company	$	1,176	$	993	$	855
Less: Portion attributable to participating securities	2		6		11
Net income attributable to common shares for diluted earnings per share	$	1,174	$	987	$	844
Basic weighted average common shares outstanding	544		542		540
Dilutive effect of potentially issuable common shares	8		9		4
Diluted weighted average common shares outstanding	552		551		544
Average stock price used to calculate common stock equivalents	$	33.10	$	29.40	$	23.76

There were 32.0 million, 38.9 million and 43.4 million stock options outstanding as of December 31, 2012, 2011 and 2010, respectively.

Other Significant Matters Impacting Results in Prior Periods: In June 2010, the Company settled a lawsuit brought by the Alaska Retirement Management Board (“ARMB”) against Mercer. Under the terms of the settlement agreement, Mercer paid $500 million, of which $100 million was covered by insurance, and recognized a charge of $400 million in the second quarter of 2010.

Estimates:  The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results may vary from those estimates.

New Accounting Pronouncements:  In the first quarter of 2012, the Company adopted new accounting guidance related to the presentation of Comprehensive Income. The new guidance gives an entity the option to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In both choices, an entity is required to present each component of net income along with total net income, each component of other comprehensive income along with a total for other comprehensive income, and a total amount for comprehensive income. The guidance eliminates the option to present the components of other comprehensive income as part of the statement of changes in stockholders’ equity. The guidance did not change the items that must be reported in other comprehensive income or when an item of other comprehensive income must be reclassified to net income.

On February 5, 2013, the FASB issued new accounting guidance that adds new disclosure requirements for items reclassified out of accumulated other comprehensive income. The Company is required to

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implement this new guidance for the reporting period ended March 31, 2013. Other than enhanced disclosure, the adoption of this new guidance is not expected to have a material effect on the Company's financial statements.

In January 2012, the Company adopted guidance issued by the FASB on accounting and disclosure requirements related to fair value measurements. The guidance expands the disclosures on Level 3 inputs by requiring quantitative disclosure of the unobservable inputs and assumptions, as well as description of the valuation processes, the sensitivity of the fair value to changes in unobservable inputs and the hierarchy classification, valuation techniques, and inputs for assets and liabilities whose fair value is only disclosed in the footnotes.

In January 2011, the Company adopted guidance issued by the FASB on revenue recognition regarding multiple-deliverable revenue arrangements. Other than enhanced disclosure, the adoption of this new guidance did not have a material effect on the Company's financial statements.

In January 2011, the Company adopted guidance issued by the FASB which establishes a revenue recognition model for contingent consideration that is payable upon the achievement of an uncertain future event, referred to as a milestone. The scope of this guidance is limited to research or development arrangements and requires an entity to record the milestone payment in its entirety in the period received if the milestone meets all the necessary criteria to be considered substantive. However, entities would not be precluded from making an accounting policy election to apply another appropriate accounting policy that results in the deferral of some portion of the arrangement consideration. The adoption of this new guidance did not have a material impact on the Company’s financial statements.

Reclassifications: Certain reclassifications have been made to prior period amounts to conform with current year presentation, in particular with regard to combining income taxes receivable with other receivables on the consolidated balance sheets.

2.    Supplemental Disclosures

The following schedule provides additional information concerning acquisitions, interest and income taxes paid:

(In millions of dollars)	2012			2011			2010
Assets acquired, excluding cash	$	380		$	214		$	867
Released from escrow in 2012	(62		)	—			—
Liabilities assumed	(42		)	(21		)	(176		)
Shares issued (7.6 million shares in 2010)	—			—			(183		)
Contingent/deferred purchase consideration	(46		)	(33		)	(81		)
Net cash outflow for current year acquisitions	230			160			427
Purchase of other intangibles	3			4			3
Deferred purchase consideration from prior years' acquisitions	59			11			62
Subtotal	$	292		$	175		$	492
Cash paid into escrow for future acquisition	—			62			—
Net cash outflow for acquisitions	$	292		$	237		$	492

(In millions of dollars)	2012		2011		2010
Interest paid	$	183	$	188	$	232
Income taxes paid, net of refunds	$	350	$	37	$	39

The Company had non-cash issuances of common stock under its share-based payment plan of $193 million, $197 million and $182 million for the years ended December 31, 2012, 2011 and 2010, respectively. The Company recorded stock-based compensation expense related to equity awards of

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$152 million, $165 million and $174 million for the years ended December 31, 2012, 2011 and 2010, respectively.

The consolidated statement of cash flows includes the cash flow impact of discontinued operations in each cash flow category. The cash flow impact of discontinued operations from the operating, financing and investing cash flow categories is as follows:

For the Year Ended December 31,
(In millions of dollars)	2012		2011		2010
Net cash provided by (used for) operations	$	—	$	11	$	(6	)
Net cash used for investing activities	$	—	$	—	$	(14	)
Effect of exchange rate changes on cash and cash equivalents	$	—	$	—	$	(2	)

The information above excludes the cash flow impacts of actual disposal transactions related to discontinued operations because the Company believes these transactions to be cash flows attributable to the parent company, arising from its decision to dispose of the discontinued operation. In 2010, the Company’s cash flow reflects cash provided by investing activities of $1.13 billion from the disposal of Kroll and $110 million related to the disposition of KLS.

An analysis of the allowance for doubtful accounts is as follows:

For the Year Ended December 31,
(In millions of dollars)	2012			2011			2010
Balance at beginning of year	$	105		$	114		$	107
Provision charged to operations	11			11			20
Accounts written-off, net of recoveries	(12		)	(21		)	(26		)
Effect of exchange rate changes and other	2			1			13
Balance at end of year	$	106		$	105		$	114

3.    Other Comprehensive Income (Loss)

The components of other comprehensive income (loss) for the years ended December 31, 2012, 2011 and 2010 are as follows:

For the year ended December 31,	2012
(In millions of dollars)	Pre-Tax			Tax (Credit)			Net of Tax
Foreign currency translation adjustments	$	177		$	(5	)	$	182
Unrealized investment gains (losses)	(1		)	1			(2		)
Pension/post-retirement plans:
Amortization of losses (gains) included in net periodic pension cost:
Prior service gains	(31		)	(12		)	(19		)
Net actuarial losses	270			90			180
Subtotal	239			78			161
Net loss arising during period	(648		)	(217		)	(431		)
Foreign currency translation adjustments	(113		)	(26		)	(87		)
Other adjustments	75			17			58
Pension/post-retirement plans losses	(447		)	(148		)	(299		)
Other comprehensive loss	$	(271	)	$	(152	)	$	(119	)

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For the year ended December 31,	2011
(In millions of dollars)	Pre-Tax			Tax (Credit)			Net of Tax
Foreign currency translation adjustments	$	(100	)	$	4		$	(104	)
Unrealized investment losses	(9		)	(4		)	(5		)
Pension/post-retirement plans:
Amortization of losses (gains) included in net periodic pension cost:
Prior service gains	(32		)	(13		)	(19		)
Net actuarial losses	213			68			145
Subtotal	181			55			126
Net loss arising during period	(1,289		)	(388		)	(901		)
Foreign currency translation adjustments	(14		)	(3		)	(11		)
Other adjustments	8			1			7
Pension/post-retirement plans losses	(1,114		)	(335		)	(779		)
Other comprehensive loss	$	(1,223	)	$	(335	)	$	(888	)

For the year ended December 31,	2010
(In millions of dollars)	Pre-Tax			Tax (Credit)			Net of Tax
Foreign currency translation adjustments	$	(34	)	$	(7	)	$	(27	)
Unrealized investment losses	(17		)	(5		)	(12		)
Pension/post-retirement plans:
Amortization of losses (gains) included in net periodic pension cost:
Prior service gains	(34		)	(13		)	(21		)
Net actuarial losses	144			48			96
Subtotal	110			35			75
Net loss arising during period	(346		)	(111		)	(235		)
Foreign currency translation adjustments	89			18			71
Other adjustments	1			2			(1		)
Pension/post-retirement plans losses	(146		)	(56		)	(90		)
Other comprehensive loss	$	(197	)	$	(68	)	$	(129	)

The components of accumulated other comprehensive income (loss) are as follows:

(In millions of dollars)	December 31, 2012			December 31, 2011
Foreign currency translation adjustments (net of deferred tax liability of $9 and $14 in 2012 and 2011, respectively)	$	140		$	(42	)
Net unrealized investment gains (net of deferred tax liability of $2 and $1 in 2012 and 2011, respectively)	4			6
Net charges related to pension / post-retirement plans (net of deferred tax asset of $1,657 and $1,508 in 2012 and 2011, respectively)	(3,451		)	(3,152		)
	$	(3,307	)	$	(3,188	)

4.     Acquisitions

The Company’s acquisitions have been accounted for as purchases. Net assets and results of operations are included in the Company’s consolidated financial statements commencing at the respective effective purchase dates. In connection with acquisitions, the Company records the estimated value of the net tangible assets purchased and the value of the identifiable intangible assets purchased, which typically consist of purchased customer lists, trademarks and non-compete agreements. The valuation of

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purchased intangible assets involves significant estimates and assumptions. Any change in assumptions could affect the carrying value of such intangible assets.

During 2012, Marsh completed the following twelve acquisitions:

• January - Marsh acquired Alexander Forbes' South African brokerage operations, including Alexander Forbes Risk Services and related ancillary operations and insurance broking operations in Botswana and Namibia to expand Marsh's presence in Africa. Marsh subsequently closed the acquisitions of the Alexander Forbes operations in Uganda, Malawi and Zambia.

• March - Marsh & McLennan Agency business ("MMA") acquired KSPH, LLC, a middle-market employee benefits agency based in Virginia, and Marsh acquired Cosmos Services (America) Inc., the U.S. insurance brokerage subsidiary of ITOCHU Corp., which specializes in commercial property/casualty, personal lines, and employee benefits brokerage services to U.S. subsidiaries of Japanese companies.

• June - MMA acquired Progressive Benefits Solutions, an employee benefits agency based in North Carolina, and Security Insurance Services, Inc., a Wisconsin-based insurance agency which offers property/casualty and employee benefits products and services to individuals and businesses.

• August - MMA acquired Rosenfeld-Einstein, a South Carolina-based employee benefits service provider, and Eidson Insurance, a property/casualty and employee benefits services firm located in Florida.

• October - MMA acquired Howalt+McDowell, a South Dakota-based agency which offers property casualty, surety, personal protection and employee benefits insurance to individuals and businesses, and The Protector Group Insurance Agency, a Massachusetts-based agency which provides property casualty, employee benefits services, personal insurance and individual financial services.

• November - MMA acquired Brower Insurance, an Ohio-based company providing employee benefits, property/casualty and consulting services.

• December - MMA acquired McGraw Wentworth, a Michigan-based company providing consulting services to mid-sized organizations, and Liscomb Hood Mason, a Minnesota-based company providing property/casualty and employee benefits products and services.

The MMA acquisitions were made to expand Marsh's presence in the U.S. middle-market business.

During 2012, Mercer completed the following three acquisitions:

• February - Mercer acquired the remaining 49% of Yokogawa-ORC, a global mobility firm based in Japan, which was previously accounted for under the equity method, and Pensjon & Finans, a leading Norway-based financial investment and pension consulting firm.

• March - Mercer acquired REPCA, a France-based broking and advisory firm for employer health and benefits plans.

Total purchase consideration for acquisitions made during 2012 was $360 million, which consisted of cash paid of $252 million, deferred purchase and estimated contingent consideration of $46 million, and cash held in escrow of $62 million at December 31, 2011 that was released in the first quarter of 2012. Contingent consideration arrangements are primarily based on EBITDA and revenue targets over two to four years. The fair value of the contingent consideration was based on projected revenue and earnings of the acquired entities. Estimated fair values of assets acquired and liabilities assumed are subject to adjustment when purchase accounting is finalized. During 2012, the Company also paid $59 million of deferred purchase consideration and $30 million of contingent consideration related to acquisitions made in prior years. In addition, the Company paid $3 million to purchase other intangible assets during 2012.

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

(In millions)	2012
Cash (includes $62 million held in escrow at December 31, 2011)	$	314
Estimated fair value of deferred/contingent consideration	46
Total Consideration	$	360
Allocation of purchase price:
Cash and cash equivalents	$	22
Accounts receivable, net	8
Other current assets	—
Property, plant, and equipment	5
Intangible assets (primarily customer lists amortized over 10 years)	147
Goodwill	226
Other assets	5
Total assets acquired	413
Current liabilities	13
Other liabilities	40
Total liabilities assumed	53
Net assets acquired	$	360

Prior Year Acquisitions

During 2011, the Company made seven acquisitions in its Risk and Insurance Services segment and five in its Consulting segment. In January 2011, Marsh acquired RJF Agencies, Inc., an independent insurance broking firm in the Midwest. In February 2011, Marsh acquired Hampton Roads Bonding, a surety bonding agency for commercial, road, utility, maritime and government contractors in the state of Virginia, and the Boston office of Kinloch Consulting Group, Inc. In July 2011, Marsh acquired Prescott Pailet Benefits, an employee benefits broker in the state of Texas. In October 2011, Marsh acquired the employee benefits division of Kaeding, Ernst & Co, a Massachusetts-based employee benefits, life insurance and financial planning consulting firm. In November 2011, Marsh acquired Gallagher & Associates, Inc., a property and casualty insurance agency based in Minnesota. In November 2011, Marsh acquired Seitlin Insurance, an insurance firm based in South Florida. These acquisitions were made to expand Marsh’s share in the middle-market through Marsh & McLennan Agency.

In January 2011, Mercer acquired Hammond Associates, an investment consulting company for endowments and foundations in the U.S. In June 2011, Mercer acquired Evaluation Associates LLC, an investment consulting firm. In July 2011, Mercer acquired Mahoney Associates, a health and benefits advisory firm based in South Florida. In August 2011, Mercer acquired Censeo Corporation, a human resource consulting firm based in Florida. In December 2011, Mercer acquired Alicia Smith & Associates, a Medicaid policy consulting firm based in Washington, D.C.

Total purchase consideration for the 2011 acquisitions was $197 million which consisted of cash paid of $164 million and deferred and estimated contingent consideration of $33 million. Contingent consideration arrangements are primarily based on EBITDA and revenue targets over two to four years. The fair value of the contingent consideration was based on projected revenue and earnings 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 $27 million of deferred purchase and contingent consideration related to acquisitions made in prior years. In addition, the Company paid $4 million to purchase other intangible assets during 2011.

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In the second quarter of 2011, Marsh acquired the remaining minority interest of a previously majority owned entity for total purchase consideration of $8 million and accounted for this acquisition under the accounting guidance for consolidations and non-controlling interests. This guidance requires that changes in a parent’s ownership interest while retaining financial controlling interest in a subsidiary be accounted for as an equity transaction. Stepping up the acquired assets to fair value or the recording of goodwill is not permitted. Therefore, the Company recorded a decrease to additional paid-in capital in 2011 of $2 million related to this transaction.

In the first quarter of 2011, the Company paid deferred purchase consideration of $13 million related to the purchase in 2009 of the minority interest of a previously controlled entity.

Pro-Forma Information

While the Company does not believe its acquisitions are material in the aggregate, the following unaudited pro-forma financial data gives effect to the acquisitions made by the Company during 2012 and 2011. 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, 2011 and reflects acquisitions made in 2011 as if they occured on January 1, 2010. The 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.

	Years Ended December 31,
(In millions, except per share data)	2012		2011		2010
Revenue	$	12,013	$	11,778	$	10,839
Income from continuing operations	$	1,214	$	990	$	580
Net income attributable to the Company	$	1,187	$	1,001	$	870
Basic net income per share:
– Continuing operations	$	2.18	$	1.78	$	1.03
– Net income attributable to the Company	$	2.18	$	1.84	$	1.59
Diluted net income per share:
– Continuing operations	$	2.15	$	1.75	$	1.02
– Net income attributable to the Company	$	2.14	$	1.81	$	1.57

The consolidated statements of income for 2012 include approximately $113 million of revenue and $21 million of net operating income, respectively, related to acquisitions made during 2012.

5.     Discontinued Operations

As part of the disposal transactions for Putnam and Kroll, the Company provided certain indemnities, primarily related to pre-transaction tax uncertainties and legal contingencies. In accordance with applicable accounting guidance, liabilities were established related to these indemnities at the time of the sales and reflected as a reduction of the gain on disposal. Discontinued operations includes charges or credits resulting from the settlement or resolution of the indemnified matters, as well as adjustments to the liabilities related to such matters. Discontinued operations in 2011 includes credits of$50 millionfrom the resolution of certain legal matters and insurance recoveries, as well as the settlement of tax audits and the expiration of the statutes of limitations related to certain of the indemnified matters, primarily with respect to Putnam.

Marsh's BPO business, previously part of the Marsh U.S. Consumer business, provided policy, claims, call center and accounting operations on an outsourced basis to life insurance carriers. Marsh invested in a technology platform that was designed to make the Marsh BPO business scalable and more efficient.

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During 2011, Marsh decided that it would cease investing in the technology platform and instead exit the business via a sale. In the fourth quarter of 2011, management initiated a plan to sell the Marsh BPO business, which was completed in August 2012. The Company wrote off capitalized software of $17 million, net of tax, which is included in discontinued operations in 2011.

In the first quarter of 2010, Kroll completed the sale of KLS and on August 3, 2010, the Company completed the sale of Kroll to Altegrity.

Kroll’s results of operations are reported as discontinued operations in the Company’s consolidated statement of income for the portion of 2010 prior to Kroll's disposal. The year ended 2010 also includes the gain on the sale of Kroll and related tax benefits and the loss on the sale of KLS, which includes the tax provision of $36 million on the sale.

The Company’s tax basis in its investment in the stock of Kroll at the time of sale exceeded the recorded amount primarily as a result of prior impairments of goodwill recognized for financial reporting, but not tax. A $265 million deferred tax benefit was recorded in discontinued operations in 2010 as a result of the sale of Kroll.

Summarized Statements of Income data for discontinued operations is as follows:

For the Year Ended December 31,
(In millions of dollars)	2012			2011			2010
Kroll Operations
Revenue	$	—		$	—		$	381
Operating expenses	—			—			345
Operating income	—			—			36
Income tax expense	—			—			16
Income from Kroll operations, net of tax	—			—			20
Other discontinued operations, net of tax	—			(17		)	(7		)
Income (loss) from discontinued operations, net of tax	—			(17		)	13
Disposals of discontinued operations (a)	(2		)	25			58
Income tax (credit) expense (b)	1			(25		)	(235		)
Disposals of discontinued operations, net of tax	(3		)	50			293
Discontinued operations, net of tax	$	(3	)	$	33		$	306
Discontinued operations, net of tax per share
– Basic	$	—		$	0.06		$	0.55
– Diluted	$	—		$	0.06		$	0.55

(a) Includes gain on sale of Kroll and the gain on the sale of KLS in 2010.

(b) Includes the provision/(credit) for income taxes relating to the recognition of tax benefits recorded in connection with the sale of Kroll as well as a tax provision of $36 million on the sale of KLS in 2010.

6.    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 test 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. The Company considered the numerous factors, which included that the fair value of each reporting unit exceeded its carrying value by a substantial margin in its most recent estimate of reporting unit fair values, whether significant acquisitions or dispositions occurred which might alter the fair values of its reporting units, macroeconomic conditions and their potential impact on reporting unit fair values, actual performance

18

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 evaluation in the third quarter of 2012 and concluded that a two-step goodwill impairment test was not required in 2012 and that goodwill was not impaired.

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.

Changes in the carrying amount of goodwill are as follows:

(In millions of dollars)	2012		2011
Balance as of January 1, as reported	$	6,562	$	6,420
Goodwill acquired	226		124
Other adjustments(a)	4		18
Balance at December 31,	$	6,792	$	6,562

(a) Reflects increases due to the impact of foreign exchange in both years. 2012 also reflects a reduction due to purchase accounting adjustments.

The goodwill acquired of $226 million in 2012 (approximately $110 million of which is deductible for tax purposes) comprised of $196 million related to the Risk and Insurance Services segment and $30 million related to the Consulting segment.

Goodwill allocable to the Company’s reportable segments is as follows: Risk and Insurance Services, $4.6 billion and Consulting, $2.2 billion.

Amortized intangible assets consist primarily of the cost of client lists and trade names acquired. The gross cost and accumulated amortization at December 31, 2012 and 2011 is as follows:

(In millions of dollars)	2012						2011
	Gross Cost		Accumulated Amortization		Net Carrying Amount		Gross Cost		Accumulated Amortization		Net Carrying Amount
Amortized intangibles	$	814	$	345	$	469	$	666	$	265	$	401

The Company recorded an intangible asset impairment charge of $8 million in the third quarter of 2012 in the Risk & Insurance Services segment.

Aggregate amortization expense for the years ended December 31, 2012, 2011 and 2010 was $72 million, $65 million and $50 million, respectively, and the estimated future aggregate amortization expense is as follows:

For the Years Ending December 31,
(In millions of dollars)
2013	$	67
2014	64
2015	61
2016	50
2017	45
Subsequent years	182
	$	469

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7.    Income Taxes

For financial reporting purposes, income before income taxes includes the following components: 

For the Years Ended December 31,
(In millions of dollars)	2012			2011		2010
Income before income taxes:
U.S.	$	398		$	121	$	(296	)
Other	1,298			1,283		1,065
	$	1,696		$	1,404	$	769
The expense (benefit) for income taxes is comprised of:
Income taxes:
Current–
U.S. Federal	$	42		$	7	$	(90	)
Other national governments	336			289		249
U.S. state and local	24			24		21
	402			320		180
Deferred–
U.S. Federal	(18		)	5		(28		)
Other national governments	89			90		50
U.S. state and local	19			7		2
	90			102		24
Total income taxes	$	492		$	422	$	204

The significant components of deferred income tax assets and liabilities and their balance sheet classifications are as follows:  

December 31,
(In millions of dollars)	2012		2011
Deferred tax assets:
Accrued expenses not currently deductible	$	589	$	559
Differences related to non-U.S. operations (a)	159		188
Accrued retirement & postretirement benefits—non-U.S. operations	107		164
Accrued retirement benefits U.S.	604		507
Net operating losses (b)	104		129
Income currently recognized for tax	75		62
Foreign tax credit carryforwards	224		169
Other	77		114
	$	1,939	$	1,892

Deferred tax liabilities:
Unrealized investment holding gains	$	2	$	3
Differences related to non-U.S. operations	107		99
Depreciation and amortization	245		233
Other	4		9
	$	358	$	344

(a) Net of valuation allowances of $7 million in 2012 and $3 millionin 2011.

(b) Net of valuation allowances of $65 million in 2012 and $46 million in 2011.

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December 31,
(In millions of dollars)	2012			2011
Balance sheet classifications:
Current assets	$	410		$	376
Other assets	$	1,223		$	1,205
Current liabilities	$	(18	)	$	(12	)
Other liabilities	$	(34	)	$	(21	)

U.S. Federal income taxes are not provided on temporary differences with respect to investments in foreign subsidiaries that are essentially permanent in duration, which at December 31, 2012 amounted to approximately $4.3 billion. The determination of the unrecognized deferred tax liability with respect to these investments is not practicable.

A reconciliation from the U.S. Federal statutory income tax rate to the Company’s effective income tax rate is shown below.

For the Years Ended December 31,	2012		2011		2010
U.S. Federal statutory rate	35.0	%	35.0	%	35.0	%
U.S. state and local income taxes—net of U.S. Federal income tax benefit	1.9		1.6		1.9
Differences related to non-U.S. operations	(6.1	)	(6.5	)	(9.5	)
Other	(1.8	)	—		(0.9	)
Effective tax rate	29.0	%	30.1	%	26.5	%

The Company’s consolidated tax rate was 29.0%, 30.1% and 26.5% in 2012, 2011 and 2010, respectively. The tax rate in each year reflects foreign operations, which are taxed at rates lower than the U.S. statutory tax rate.

Valuation allowances had net increases of $23 million and decreases of $1 million in 2012 and 2011, respectively. During the respective years, adjustments of the beginning of the year balances of valuation allowances increased income tax expense by $16 million in 2012 and decreased income tax expense by $7 million in 2011. None of the cumulative valuation allowances relate to amounts which if realized would increase contributed capital in the future. Approximately 73% of the Company’s net operating loss carryforwards expire from 2013 through 2032, and others are unlimited. The potential tax benefit from net operating loss carryforwards at the end of 2012 comprised state and local, and non-U.S. tax benefits of $78 million and $90 million, respectively, before reduction for valuation allowances. Foreign tax credit carryforwards expire from 2018 through 2022.

The realization of deferred tax assets depends on generating future taxable income in the applicable jurisdiction during the periods in which the tax benefits are deductible or creditable. The Company, including Marsh have been profitable globally. However, tax liabilities are determined and assessed on a legal entity and jurisdictional basis. Certain taxing jurisdictions allow or require combined or consolidated tax filings.

In the United States, certain groups within the Company, which file on a combined basis, were profitable in 2011 and 2012, but incurred a loss in 2010 as a result of the cost resulting from the resolution of the ARMB matter. The Company assessed the realizability of its domestic deferred tax assets, particularly state deferred tax assets of Marsh relating to jurisdictions in which it files separate tax returns, state deferred tax assets of all of the Company's domestic operations related to jurisdictions in which the Company files a unitary or combined state tax return, and foreign tax credit carryforwards in the Company's consolidated U.S. federal tax return. When making its assessment about the realization of its domestic deferred tax assets at December 31, 2012, the Company considered all available evidence, placing particular weight on evidence that could be objectively verified. The evidence considered included (i) the profitability of the Company's U.S. operations in 2011 and 2012 and the cumulative period from 2010 through 2012, (ii) the nature, frequency, and severity of financial reporting losses incurred prior to

21

2011, (iii) profit trends evidenced by continued improvements in the Company's and Marsh's operating performance, (iv) the non-recurring nature of some of the items that contributed to the losses before 2011, (v) the carryforward periods for the net operating losses ("NOLs") and foreign tax credit carryforwards, (vi) the sources and timing of future taxable income, giving weight to sources according to the extent to which they can be objectively verified, and (vii) tax planning strategies that would be implemented, if necessary, to accelerate utilization of NOLs. Based on its assessment, the Company concluded that it is more likely than not that a substantial portion of these deferred tax assets are realizable and a valuation allowance was recorded to reduce the domestic tax assets to the amount that the Company believes is more likely than not to be realized. In the event sufficient taxable income is not generated in future periods, additional valuation allowances of up to approximately $270 million could be required relating to these domestic deferred tax assets. The realization of the remaining U.S. federal deferred tax assets is not as sensitive to U.S. profits because it is supported by anticipated repatriation of future annual earnings from the Company’s profitable global operations, consistent with the Company's historical practice. In addition, when making its assessment about the realization of its domestic deferred tax assets at December 31, 2012, the Company continued to assess the realizability of deferred tax assets of certain other entities with a history of recent losses, including other U.S. entities that file separate state tax returns and foreign subsidiaries, and recorded valuation allowances as appropriate.

Following is a reconciliation of the Company’s total gross unrecognized tax benefits for the years ended December 31, 2012, 2011 and 2010:

(In millions of dollars)	2012			2011			2010
Balance at January 1,	$	143		$	199		$	206
Additions, based on tax positions related to current year	26			7			7
Additions for tax positions of prior years	35			39			10
Reductions for tax positions of prior years	(41		)	(91		)	(6		)
Reductions due to reclassification of tax indemnifications on sale of Kroll	—			—			(3		)
Settlements	(6		)	(6		)	(4		)
Lapses in statutes of limitation	(40		)	(5		)	(11		)
Balance at December 31,	$	117		$	143		$	199

Of the total unrecognized tax benefits at December 31, 2012, 2011 and 2010, $96 million, $102 million and $123 million, respectively, represent the amount that, if recognized, would favorably affect the effective tax rate in any future periods. The total gross amount of accrued interest and penalties at December 31, 2012 , 2011 and 2010, before any applicable federal benefit, was $13 million, $17 million and $35 million, respectively.

As discussed in Note 5, the Company has provided certain indemnities related to contingent tax liabilities as part of the disposals of Putnam and Kroll. At December 31, 2012, 2011 and 2010, $6 million, $14 million and $75 million, respectively, included in the table above, relates to Putnam and Kroll positions included in consolidated Company tax returns. Since the Company remains primarily liable to the taxing authorities for resolution of uncertain tax positions related to consolidated returns, these balances will remain as part of the Company’s consolidated liability for uncertain tax positions. Any future charges or credits that are directly related to the disposal of Putnam and Kroll and the indemnified contingent tax issues, including interest accrued, will be recorded in discontinued operations as incurred. The balance of gross unrecognized tax benefits at January 1, 2010 in the chart above includes balances related to stand alone tax filings of Kroll that were reclassified and are included as part of the fair value liability for contingent tax indemnities following the sale transaction.

The Company is routinely examined by the jurisdictions in which it has significant operations. The Internal Revenue Service (IRS) is currently examining 2009 and 2010.   During 2011, the Company was accepted to participate in the IRS Compliance Assurance Process (CAP) which is structured to conduct real-time compliance reviews.  The IRS is currently examining 2011 and performing a pre-filing review of the Company's 2012 U.S. operations. New York State has examinations underway for various entities covering the years 2007 through 2010. At the end of 2012, Massachusetts issued Notices of Assessment

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for 2007 for various entities and the Company is currently appealing those assessments. During 2012, the United Kingdom completed its examination of tax year 2010 for various subsidiaries. There are no ongoing tax audits in the jurisdictions outside the U.S. in which the company has significant operations. The Company regularly considers the likelihood of assessments in each of the taxing jurisdictions resulting from examinations. The Company has established appropriate liabilities for uncertain tax positions in relation to the potential assessments. The Company believes the resolution of tax matters will not have a material effect on the consolidated financial position of the Company, although a resolution of tax matters could have a material impact on the Company's net income or cash flows and on its effective tax rate in a particular future period. It is reasonably possible that the total amount of unrecognized tax benefits will decrease between zero and approximately $25 million within the next twelve months due to settlement of audits and expiration of statutes of limitation.

8.    Retirement Benefits

The Company maintains qualified and non-qualified defined benefit pension plans for its U.S. and non-U.S. eligible employees. The Company’s policy for funding its tax qualified defined benefit retirement plans is to contribute amounts at least sufficient to meet the funding requirements set forth by U.S. law and the laws of the non-U.S. jurisdictions in which the Company offers defined benefit plans.

Combined U.S. and non-U.S. Plans

The weighted average actuarial assumptions utilized for the U.S. and significant non-U.S. defined benefit plans and postretirement benefit plans are as follows:

	Pension  Benefits				Postretirement Benefits
	2012		2011		2012		2011
Weighted average assumptions:
Discount rate (for expense)	4.91	%	5.59	%	5.05	%	5.81	%
Expected return on plan assets	8.03	%	8.19	%	—		—
Rate of compensation increase (for expense)	3.09	%	4.08	%	—		—
Discount rate (for benefit obligation)	4.38	%	4.91	%	4.32	%	5.05	%
Rate of compensation increase (for benefit obligation)	2.43	%	3.09	%	—		—

The Company uses actuaries from Mercer, a subsidiary of the Company, to perform valuations of its pension plans. The long-term rate of return assumption is determined for each plan based on the facts and circumstances that exist as of the measurement date, and the specific portfolio mix of each plan’s assets. The Company utilizes a model developed by the Mercer actuaries to assist in the determination of this assumption. The model takes into account several factors, including: actual and target portfolio allocation; investment, administrative and trading expenses incurred directly by the plan trust; historical portfolio performance; relevant forward-looking economic analysis; and expected returns, variances and correlations for different asset classes. These measures are used to determine probabilities using standard statistical techniques to calculate a range of expected returns on the portfolio. The Company generally does not adjust the rate of return assumption from year to year if, at the measurement date, it is within the best estimate range, defined as between the 25^thand 75^thpercentile of the expected long-term annual returns in accordance with the “American Academy of Actuaries Pension Practice Council Note May 2001 Selecting and Documenting Investment Return Assumptions” and consistent with Actuarial Standards of Practice No. 27. Historical long-term average asset returns of each plan are also reviewed to determine whether they are consistent and reasonable compared with the best estimate range. The expected return on plan assets is determined by applying the assumed long-term rate of return to the market-related value of plan assets. This market-related value recognizes investment gains or losses over a five-year period from the year in which they occur. Investment gains or losses for this purpose are the difference between the expected return calculated using the market-related value of assets and the actual return based on the market value of assets. Since the market-related value of assets recognizes gains or losses over a five-year period, the future market-related value of the assets will be impacted as previously deferred gains or losses are recorded.

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The target asset allocation for the U.S. Plan is 58% equities and equity alternatives and 42% fixed income. At the end of 2012, the actual allocation for the U.S. Plan was 58% equities and equity alternatives and 42% fixed income. The target asset allocation for the U.K. Plan, which comprises approximately 82% of non-U.S. Plan assets, is 53% equities and equity alternatives and 47% fixed income. At the end of 2012, the actual allocation for the U.K. Plan was 52% equities and equity alternatives and 48% fixed income. 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 uses threshold-based portfolio rebalancing to ensure the actual portfolio remains consistent with target asset allocation ranges.

The discount rate selected for each U.S. plan is based on a model bond portfolio with coupons and redemptions that closely match the expected liability cash flows from the plan. Discount rates for non-U.S. plans are based on appropriate bond indices such as the Markit iBoxx £ Corporates AA 15+ index in the U.K. Projected compensation increases reflect current expectations as to future levels of inflation.

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

Combined U.S. and significant non-U.S. Plans	Pension									Postretirement
For the Years Ended December 31,	Benefits									Benefits
(In millions of dollars)	2012			2011			2010			2012			2011			2010
Service cost	$	240		$	226		$	197		$	5		$	5		$	4
Interest cost	596			609			578			13			13			14
Expected return on plan assets	(905		)	(887		)	(815		)	—			—			—
Amortization of prior service credit	(19		)	(19		)	(21		)	(14		)	(13		)	(13		)
Recognized actuarial loss (credit)	270			215			144			—			(4		)	—
Net periodic benefit cost	$	182		$	144		$	83		$	4		$	1		$	5

Plan Assets

For the U.S. plan, investment allocation decisions are made by a fiduciary committee composed of senior executives appointed by the Company’s Chief Executive Officer. For the non-U.S. plans, investment allocation decisions are made by local fiduciaries, in consultation with the Company for the larger plans. Plan assets are invested in a manner consistent with the fiduciary standards set forth in all relevant laws relating to pensions and trusts in each country. Primary investment objectives are (1) to achieve an investment return that, in combination with current and future contributions, will provide sufficient funds to pay benefits, and (2) to minimize the risk of large losses. The investment allocations are designed to meet these objectives by broadly diversifying plan assets among numerous asset classes with differing expected returns, volatilities, and correlations.

The major categories of plan assets include equity securities, equity alternative investments, and fixed income securities. For the U.S. qualified plan, the category ranges are 53-63% for equities and equity alternatives, and 37-47% for fixed income. For the U.K. Plan, the category ranges are 50-56% for equities and equity alternatives, and 44-50% for fixed income. Asset allocation ranges are evaluated generally every three years. Asset allocation is monitored frequently and re-balancing actions are taken as appropriate.

Plan investments are exposed to stock market, interest rate, and credit risk. Concentrations of these risks are generally limited due to diversification by investment style within each asset class, diversification by investment manager, diversification by industry sectors and issuers, and the dispersion of investments across many geographic areas.

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Unrecognized Actuarial Gains/Losses

In accordance with applicable accounting guidance, the funded status of the Company's pension plans is recorded in the consolidated balance sheets and provides for a delayed recognition of actuarial gains or losses arising from changes in the projected benefit obligation due to changes in the assumed discount rates, differences between the actual and expected value of plan assets and other assumption changes. The unrecognized pension plan actuarial gains or losses and prior service costs not yet recognized in net periodic pension cost are recognized in AOCI, net of tax. These gains and losses are amortized prospectively out of AOCI over a period that approximates the average remaining service period of active employees, or for plans in which substantially all the participants are inactive, over the remaining life expectancy of the inactive employees.

U.S. Plans

The following schedules provide information concerning the Company’s U.S. defined benefit pension plans and postretirement benefit plans:

	U.S. Pension Benefits						U.S.  Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Change in benefit obligation:
Benefit obligation at beginning of year	$	4,533		$	4,041		$	162		$	180
Service cost	93			83			3			3
Interest cost	230			231			8			8
Actuarial (gain) loss	522			352			13			(20		)
Medicare Part D subsidy	—			—			3			4
Benefits paid	(181		)	(174		)	(13		)	(13		)
Benefit obligation, December 31	$	5,197		$	4,533		$	176		$	162
Change in plan assets:
Fair value of plan assets at beginning of year	$	3,493		$	3,444		$	—		$	—
Actual return on plan assets	500			199			—			—
Employer contributions	124			24			10			9
Medicare Part D subsidy	—			—			3			4
Benefits paid	(181		)	(174		)	(13		)	(13		)
Fair value of plan assets, December 31	$	3,936		$	3,493		$	—		$	—
Net funded status, December 31	$	(1,261	)	$	(1,040	)	$	(176	)	$	(162	)
Amounts recognized in the consolidated balance sheets:
Current liabilities	$	(25	)	$	(124	)	$	(9	)	$	(9	)
Noncurrent liabilities	(1,236		)	(916		)	(167		)	(153		)
Net liability recognized, December 31	$	(1,261	)	$	(1,040	)	$	(176	)	$	(162	)
Amounts recognized in other comprehensive income (loss):
Prior service credit	$	23		$	39		$	—		$	13
Net actuarial (loss) gain	(1,887		)	(1,695		)	(2		)	12
Total recognized accumulated other comprehensive (loss) income, December 31	$	(1,864	)	$	(1,656	)	$	(2	)	$	25
Cumulative employer contributions in excess (deficient) of net periodic cost	603			616			(174		)	(187		)
Net amount recognized in consolidated balance sheet	$	(1,261	)	$	(1,040	)	$	(176	)	$	(162	)
Accumulated benefit obligation at December 31	$	5,114		$	4,467		$	—		$	—

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	U.S. Pension Benefits						U.S.  Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Reconciliation of prior service credit (charge) recognized in accumulated other comprehensive income (loss):
Beginning balance	$	39		$	55		$	13		$	26
Recognized as component of net periodic benefit credit	(16		)	(16		)	(13		)	(13		)
Prior service credit, December 31	$	23		$	39		$	—		$	13

	U.S. Pension Benefits						U.S.  Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Reconciliation of net actuarial gain (loss) recognized in accumulated other comprehensive income (loss):
Beginning balance	$	(1,695	)	$	(1,327	)	$	12		$	(4	)
Recognized as component of net periodic benefit cost	152			100			(1		)	(4		)
Changes in plan assets and benefit obligations recognized in other comprehensive income (loss):
Liability experience	(522		)	(352		)	(13		)	20
Asset experience	178			(116		)	—			—
Total gain (loss) recognized as change in plan assets and benefit obligations	(344		)	(468		)	(13		)	20
Net actuarial gain (loss), December 31	$	(1,887	)	$	(1,695	)	$	(2	)	$	12

For the Years Ended December 31,	U.S. Pension Benefits						U.S. Postretirement Benefits
(In millions of dollars)	2012		2011		2010		2012		2011			2010
Total recognized in net periodic benefit cost and other comprehensive loss (income)	$	346	$	467	$	148	$	24	$	(9	)	$	26

Estimated amounts that will be amortized from accumulated other comprehensive income in the next fiscal year:

	U.S. Pension Benefits			U.S. Postretirement Benefits
(In millions of dollars)	2013			2013
Prior service cost	$	(16	)	$	—
Net actuarial loss	202			—
Projected cost	$	186		$	—

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The weighted average actuarial assumptions utilized in determining the above amounts for the U.S. defined benefit and other U.S. postretirement plans as of the end of the year are as follows:

	U.S. Pension Benefits				U.S. Postretirement Benefits
	2012		2011		2012		2011
Weighted average assumptions:
Discount rate (for expense)	5.15	%	5.90	%	5.10	%	5.95	%
Expected return on plan assets	8.75	%	8.75	%	—		—
Rate of compensation increase (for expense)	2.00	%	3.90	%	—		—
Discount rate (for benefit obligation)	4.45	%	5.15	%	4.25	%	5.10	%
Rate of compensation increase (for benefit obligation)	2.00	%	2.00	%	—		—

The projected benefit obligation, accumulated benefit obligation and aggregate fair value of plan assets for U.S. pension plans with accumulated benefit obligations in excess of plan assets were $5.2 billion, $5.1 billion and $3.9 billion, respectively, as of December 31, 2012 and $4.5 billion, $4.5 billion and $3.5 billion, respectively, as of December 31, 2011.

The projected benefit obligation and fair value of plan assets for U.S. pension plans with projected benefit obligations in excess of plan assets was $5.2 billion and $3.9 billion, respectively, as of December 31, 2012 and $4.5 billion and $3.5 billion, respectively, as of December 31, 2011.

As of December 31, 2012, the U.S. qualified plan holds eight million shares of the Company’s common stock which were contributed to the Plan by the Company in 2005. This represents approximately 7% of that plan’s assets as of December 31, 2012. In addition, plan assets may be invested in funds managed by Mercer Investments.

The components of the net periodic benefit cost for the U.S. defined benefit and other postretirement benefit plans are as follows:

U.S. Plans only	Pension Benefits									Postretirement Benefits
For the Years Ended December 31,
(In millions of dollars)	2012			2011			2010			2012			2011			2010
Service cost	$	93		$	83		$	76		$	3		$	3		$	3
Interest cost	230			231			227			8			8			10
Expected return on plan assets	(322		)	(315		)	(295		)	—			—			—
Amortization of prior service credit	(16		)	(16		)	(18		)	(13		)	(13		)	(13		)
Recognized actuarial loss (credit)	152			100			71			(1		)	(4		)	—
Net periodic benefit cost (credit)	$	137		$	83		$	61		$	(3	)	$	(6	)	$	—

In December 2003, the Medicare Prescription Drug, Improvement and Modernization Act of 2003 became law. The net periodic benefit cost shown above for 2012, 2011 and 2010, respectively, includes the subsidy.

The assumed health care cost trend rate for Medicare eligibles is approximately 7.86% in 2012, gradually declining to 4.5% in 2028, and the rate for non-Medicare eligibles is 7.73% in 2012, gradually declining to 4.50% in 2028. Assumed health care cost trend rates have a small effect on the amounts reported for the U.S. health care plans because the Company caps its share of health care trend at 5%. A one percentage point change in assumed health care cost trend rates would have the following effects:

(In millions of dollars)	1 Percentage Point Increase		1 Percentage Point Decrease
Effect on total of service and interest cost components	$	—	$	—
Effect on postretirement benefit obligation	$	1	$	(5	)

Estimated Future Contributions

The Company expects to fund approximately $25 million for its U.S. non-qualified plan in 2013. The Company’s policy for funding its tax-qualified defined benefit retirement plans is to contribute amounts at

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least sufficient to meet the funding requirements set forth in the U.S. and applicable foreign law. There currently is no ERISA funding requirement for the U.S. qualified plan for 2013.

Non-U.S. Plans

The following schedules provide information concerning the Company’s non-U.S. defined benefit pension plans and non-U.S. postretirement benefit plans:

	Non-U.S. Pension Benefits						Non-U.S. Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Change in benefit obligation:
Benefit obligation at beginning of year	$	7,717		$	6,802		$	91		$	83
Service cost	147			143			2			2
Interest cost	366			378			5			5
Employee contributions	11			14			—			—
Actuarial loss	419			575			10			5
Plan amendments	(71		)	(3		)	—			—
Effect of settlement	(11		)	(7		)	—			—
Effect of curtailment	(3		)	(1		)	(1		)	—
Benefits paid	(278		)	(266		)	(4		)	(4		)
Foreign currency changes	280			66			4			—
Other	2			16			—			—
Benefit obligation at, December 31	$	8,579		$	7,717		$	107		$	91
Change in plan assets:
Fair value of plan assets at beginning of year	$	7,206		$	6,741		$	—		$	—
Actual return on plan assets	721			311			—			—
Effect of settlement	(11		)	(6		)	—			—
Company contributions	389			320			4			4
Employee contributions	11			14			—			—
Benefits paid	(278		)	(266		)	(4		)	(4		)
Foreign currency changes	273			82			—			—
Other	1			10			—			—
Fair value of plan assets, December 31	$	8,312		$	7,206		$	—		$	—
Net funded status, December 31	$	(267	)	$	(511	)	$	(107	)	$	(91	)
Amounts recognized in the consolidated balance sheets:
Non-current assets	$	258		$	39		$	—		$	—
Current liabilities	(6		)	(106		)	(4		)	(4		)
Non-current liabilities	(519		)	(444		)	(103		)	(87		)
Net liability recognized, December 31	$	(267	)	$	(511	)	$	(107	)	$	(91	)
Amounts recognized in other comprehensive income (loss):
Prior service credit	$	93		$	23		$	—		$	1
Net actuarial (loss) gain	(3,309		)	(3,038		)	(27		)	(19		)
Total recognized accumulated other comprehensive (loss) income, December 31	$	(3,216	)	$	(3,015	)	$	(27	)	$	(18	)
Cumulative employer contributions in excess (deficient) of net periodic cost	2,949			2,504			(80		)	(73		)
Net amount recognized in consolidated balance sheet, December 31	$	(267	)	$	(511	)	$	(107	)	$	(91	)
Accumulated benefit obligation, December 31	$	8,229		$	7,246		$	—		$	—

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	Non-U.S. Pension Benefits						Non-U.S. Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Reconciliation of prior service credit (cost):
Beginning balance	$	23		$	23		$	1		$	1
Recognized as component of net periodic benefit credit	(3		)	3			(1		)	—
Effect of curtailment	(1		)	—			—			—
Changes in plan assets and benefit obligations recognized in other comprehensive income:
Plan amendments	71			(3		)	—			—
Exchange rate adjustments	3			—			—			—
Prior service credit, December 31	$	93		$	23		$	—		$	1

	Non-U.S. Pension Benefits						Non-U.S. Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Reconciliation of net actuarial gain (loss):
Beginning balance	$	(3,038	)	$	(2,305	)	$	(19	)	$	(14	)
Recognized as component of net periodic benefit cost	118			115			1			—
Effect of settlement	1			—			—			—
Changes in plan assets and benefit obligations recognized in other comprehensive income (loss):
Liability experience	(419		)	(575		)	(10		)	(5		)
Asset experience	138			(261		)	—			—
Effect of curtailment	3			(1		)	1			—
Total amount recognized as change in plan assets and benefit obligations	(278		)	(837		)	(9		)	(5		)
Exchange rate adjustments	(112		)	(11		)	—			—
Net actuarial gain (loss), December 31	$	(3,309	)	$	(3,038	)	$	(27	)	$	(19	)

For the Years Ended December 31,	Non-U.S. Pension Benefits						Non-U.S. Postretirement Benefits
(In millions of dollars)	2012		2011		2010		2012		2011		2010
Total recognized in net periodic benefit cost and other comprehensive loss	$	246	$	792	$	66	$	16	$	12	$	15

Estimated amounts that will be amortized from accumulated other comprehensive income in the next fiscal year:

	Non-U.S. Pension Benefits			Non-U.S. Postretirement Benefits
(In millions of dollars)	2013			2013
Prior service cost	$	(6	)	$	—
Net actuarial loss	112			2
Projected cost	$	106		$	2

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The weighted average actuarial assumptions utilized for the non-U.S. defined and postretirement benefit plans as of the end of the year are as follows:

	Non-U.S. Pension Benefits				Non-U.S. Postretirement Benefits
	2012		2011		2012		2011
Weighted average assumptions:
Discount rate (for expense)	4.77	%	5.41	%	4.95	%	5.51	%
Expected return on plan assets	7.68	%	7.91	%	—		—
Rate of compensation increase (for expense)	3.73	%	4.19	%	—		—
Discount rate (for benefit obligation)	4.33	%	4.77	%	4.45	%	4.95	%
Rate of compensation increase (for benefit obligation)	2.69	%	3.73	%	—		—

The non-U.S. defined benefit plans do not have any direct ownership of the Company’s common stock.

The pension plan in the United Kingdom holds a limited partnership interest in the Trident III private equity fund valued at approximately $200 million at December 31, 2012.

The projected benefit obligation, accumulated benefit obligation and fair value of plan assets for the non-U.S. pension plans with accumulated benefit obligations in excess of plan assets were $1.7 billion, $1.6 billion and $1.2 billion, respectively, as of December 31, 2012 and $1.4 billion, $1.3 billion and $1 billion, respectively, as of December 31, 2011.

The projected benefit obligation and fair value of plan assets for non-U.S. pension plans with projected benefit obligations in excess of plan assets was $1.7 billion and $1.2 billion, respectively, as of December 31, 2012 and $7.6 billion and $7.0 billion, respectively, as of December 31, 2011.

The components of the net periodic benefit cost for the non-U.S. defined benefit and other postretirement benefit plans and the curtailment, settlement and termination expenses are as follows:

For the Years Ended December 31,	Non-U.S. Pension Benefits									Non-U.S. Postretirement Benefits
(In millions of dollars)	2012			2011			2010			2012			2011		2010
Service cost	$	147		$	143		$	121		$	2		$	2	$	1
Interest cost	366			378			351			5			5		4
Expected return on plan assets	(583		)	(572		)	(520		)	—			—		—
Amortization of prior service cost	(3		)	(3		)	(3		)	(1		)	—		—
Recognized actuarial loss	118			115			73			1			—		—
Net periodic benefit cost	45			61			22			7			7		5
Settlement loss	1			—			5			—			—		—
Curtailment credit	(1		)	—			—			—			—		—
Special termination benefits	—			—			1			—			—		—
Total cost	$	45		$	61		$	28		$	7		$	7	$	5

The assumed health care cost trend rate was approximately 5.47% in 2012, gradually declining to 4.48% in 2031. Assumed health care cost trend rates can have a significant effect on the amounts reported for the non-U.S. health care plans. A one percentage point change in assumed health care cost trend rates would have the following effects:

(In millions of dollars)	1 Percentage Point Increase		1 Percentage Point Decrease
Effect on total of service and interest cost components	$	1	$	(1	)
Effect on postretirement benefit obligation	$	12	$	(10	)

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Estimated Future Contributions

The Company expects to fund approximately $623 million to its non-U.S. pension plans in 2013. Funding requirements for non-U.S. plans vary by country. Contribution rates are generally based on local funding practices and requirements, which may differ significantly from measurements under U.S. GAAP. Funding amounts may be influenced by future asset performance, the level of discount rates and other variables impacting the assets and/or liabilities of the plan. Discretionary contributions may also be affected by alternative uses of the Company’s cash flows, including dividends, investments and share repurchases.

Estimated Future Benefit Payments

The Plan’s estimated future benefit payments for its pension and postretirement benefits (without reduction for Medicare subsidy receipts) at December 31, 2012 are as follows:

December 31,	Pension Benefits				Postretirement Benefits
(In millions of dollars)	U.S.		Non-U.S.		U.S.		Non-U.S.
2013	$	210	$	275	$	11	$	4
2014	$	221	$	276	$	11	$	4
2015	$	231	$	287	$	11	$	4
2016	$	242	$	310	$	11	$	4
2017	$	251	$	321	$	11	$	5
2018-2022	$	1,394	$	1,910	$	59	$	27

Defined Benefit Plans Fair Value Disclosures

In December 2008 the FASB issued guidance for Employers’ Disclosures About Pension and Other Post Retirement Benefit Plan Assets. The guidance requires fair value plan asset disclosures for an employer’s defined benefit pension and postretirement plans similar to the guidance on Fair Value Measurements as well as (a) how investment allocation decisions are made, (b) the major categories of plan assets, and (c) significant concentrations of risk within plan assets.

The U.S. and non-U.S. plan investments are classified into Level 1, which refers to investments valued using quoted prices from active markets for identical assets; Level 2, which refers to investments not traded on an active market but for which observable market inputs are readily available; and Level 3, which refers to investments valued based on significant unobservable inputs. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.

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The following table sets forth, by level within the fair value hierarchy, a summary of the U.S. and non-U.S. plans investments measured at fair value on a recurring basis at December 31, 2012 and 2011.

	Fair Value Measurements at December 31, 2012
Assets (In millions of dollars)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Common/Collective trusts	$	16	$	5,376	$	—	$	5,392
Corporate obligations	—		2,236		1		2,237
Corporate stocks	2,005		4		9		2,018
Private equity/Partnerships	2		2		824		828
Government securities	9		309		—		318
Real estate	11		8		357		376
Short-term investment funds	410		4		—		414
Company common stock	276		—		—		276
Other investments	11		112		216		339
Insurance group annuity contracts	—		—		23		23
Swaps	—		4		—		4
Total investments	$	2,740	$	8,055	$	1,430	$	12,225

	Fair Value Measurements at December 31, 2011
Assets (In millions of dollars)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Common/Collective trusts	$	10	$	4,837	$	—	$	4,847
Corporate obligations	—		1,792		1		1,793
Corporate stocks	1,716		15		8		1,739
Private equity/Partnerships	—		1		779		780
Government securities	10		368		—		378
Real estate	14		4		319		337
Short-term investment funds	288		42		—		330
Company common stock	253		—		—		253
Other investments	1		34		202		237
Insurance group annuity contracts	—		—		20		20
Swaps	—		5		—		5
Total investments	$	2,292	$	7,098	$	1,329	$	10,719

There were no transfers between Level 1 and Level 2 assets during 2012 or 2011.

The tables below set forth a summary of changes in the fair value of the plans’ Level 3 assets for the years ended December 31, 2012 and December 31, 2011:

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Assets (In millions)	Fair Value, January 1, 2012		Purchases		Sales			Unrealized Gain/ (Loss)		Realized Gain/ (Loss)			Exchange Rate Impact		Transfers in/(out) and Other		Fair Value, December 31, 2012
Private equity/Partnerships	$	779	$	86	$	(79	)	$	138	$	(113	)	$	13	$	—	$	824
Real estate	319		11		(3		)	104		(86		)	12		—		357
Other investments	202		17		(24		)	11		6			4		—		216
Insurance group annuity contracts	20		160		(157		)	1		(1		)	—		—		23
Corporate stocks	8		1		—			—		—			—		—		9
Corporate obligations	1		—		—			—		—			—		—		1
Total assets	$	1,329	$	275	$	(263	)	$	254	$	(194	)	$	29	$	—	$	1,430

Assets (In millions)	Fair Value, January 1, 2011		Purchases		Sales			Unrealized Gain/ (Loss)			Realized Gain/ (Loss)			Exchange Rate Impact			Transfers in/(out) and Other			Fair Value, December 31, 2011
Private equity/Partnerships	$	746	$	119	$	(80	)	$	(83	)	$	70		$	7		$	—		$	779
Real estate	293		—		—			22			(1		)	5			—			319
Other investments	177		32		(13		)	6			2			(2		)	—			202
Insurance group annuity contracts	20		151		(150		)	8			(9		)	—			—			20
Corporate stocks	1		8		—			(1		)	—			—			—			8
Corporate obligations	8		1		(8		)	2			(1		)	—			(1		)	1
Total assets	$	1,245	$	311	$	(251	)	$	(46	)	$	61		$	10		$	(1	)	$	1,329

The following is a description of the valuation methodologies used for assets measured at fair value:

Company common stock:  Valued at the closing price reported on the New York Stock Exchange.

Common stocks, preferred stocks, convertible equity securities and rights/warrants (included in Corporate stocks):  Valued at the closing price reported on the primary exchange.

Corporate bonds (included in corporate obligations):  The fair value of corporate bonds is estimated using recently executed transactions, market price quotations (where observable) and bond spreads. The spread data used are for the same maturity as the bond. If the spread data does not reference the issuer, then data that references a comparable issuer are used. When observable price quotations are not available, fair value is determined based on cash flow models.

Commercial paper (included in corporate obligations):  The fair value of commercial paper is estimated using observable market data such as maturity date, issue date, credit rating, current commercial paper rates and settlement date.

Commercial mortgage-backed and asset-backed securities (included in corporate obligations):  Fair value is determined using discounted cash flow models. Observable inputs are based on trade and quote activity of bonds with similar features including issuer vintage, purpose of underlying loan (first or second lien), prepayment speeds and credit ratings. The discount rate is the combination of the appropriate rate from the benchmark yield curve and the discount margin based on quoted prices.

Common/Collective trusts:  Valued at the quoted market prices of the underlying investments at year end.

U.S. government bonds (included in government securities):  The fair value of U.S. government bonds is estimated by pricing models that utilize observable market data including quotes, spreads and data points for yield curves.

U.S. agency securities (included in government securities):  U.S. agency securities are comprised of two main categories consisting of agency issued debt and mortgage pass-throughs. Agency issued debt securities are valued by benchmarking market-derived prices to quoted market prices and trade data for

33

identical or comparable securities. Mortgage pass-throughs include certain “To-be-announced” (TBA) securities and mortgage pass-through pools. TBA securities are generally valued using quoted market prices or are benchmarked thereto. Fair value of mortgage pass-through pools are model driven with respect to spreads of the comparable TBA security.

Private equity and real estate partnerships:  Investments in private equity and real estate partnerships are valued based on the fair value reported by the manager of the corresponding partnership. The managers provide unaudited quarterly financial statements and audited annual financial statements which set forth the value of the fund. The valuations obtained from the managers are based on various analyses on the underlying holdings in each partnership, including financial valuation models and projections, comparable valuations from the public markets, and precedent private market transactions. Investments are valued in the accompanying financial statements based on the Plan’s beneficial interest in the underlying net assets of the partnership as determined by the partnership agreement.

Insurance group annuity contracts:  The fair values for these investments are based on the current market value of the aggregate accumulated contributions plus interest earned.

Swap assets and liabilities:  Fair values for interest rate swaps, equity index swaps and inflation swaps are estimated using a discounted cash flow pricing model. These models use observable market data such as contractual fixed rate, broker quotes, spot equity price or index value and dividend data. The fair values of credit default swaps are estimated using an income approach model which determines expected cash flows based on default probabilities from the issuer specific credit spread curve and credit loss recovery rates, both of which are dependent on market quotes.

Real estate investment trusts:  Valued at the closing price reported on an exchange.

Short-term investment funds:  Primarily high-grade money market instruments valued at net asset value at year-end.

Real estate: Valued by investment managers generally using proprietary pricing models.

Registered investment companies:  Valued at the closing price reported on the primary exchange.

Defined Contribution Plans

The Company maintains certain defined contribution plans for its employees, including the Marsh & McLennan Companies 401(k) Savings & Investment Plan (“401(k) Plan”), that are qualified under U.S. tax laws. Under these plans, eligible employees may contribute a percentage of their base salary, subject to certain limitations. For the 401(k) Plan, the Company matches a fixed portion of the employees’ contributions. The 401(k) Plan contains an Employee Stock Ownership Plan feature under U.S. tax law. Approximately $375 million of the 401(k) Plan’s assets at December 31, 2012 and $366 million at December 31, 2011 were invested in the Company’s common stock. If a participant does not choose an investment direction for his or her future contributions, they are automatically invested in a BlackRock LifePath Portfolio that most closely matches the participant’s expected retirement year. The cost of these defined contribution plans related to continuing operations was $50 million in 2012 and $48 million for 2011 and 2010.

9. Stock Benefit Plans

The Company maintains multiple stock-based payment arrangements under which employees are awarded grants of restricted stock units, stock options and other forms of stock-based payment arrangements.

Marsh & McLennan Companies, Inc. Incentive and Stock Award Plans

On May 19, 2011, the Marsh & McLennan Companies, Inc. 2011 Incentive and Stock Award Plan (the “2011 Plan”) was approved by the Company's stockholders. The 2011 Plan replaced the Company's two previous equity incentive plans (the 2000 Senior Executive Incentive and Stock Award Plan and the 2000 Employee Incentive and Stock Award Plan).

34

The types of awards permitted under the 2011 Plan include stock options, restricted stock and restricted stock units payable in Company common stock or cash, and other stock-based and performance-based awards. The Compensation Committee of the Board of Directors (the “Compensation Committee”) determines, at its discretion, which affiliates may participate in the 2011 Plan, which eligible employees will receive awards, the types of awards to be received, and the terms and conditions thereof. The right of an employee to receive an award may be subject to performance conditions as specified by the Compensation Committee. The 2011 Plan contains provisions which, in the event of a change in control of the Company, may accelerate the vesting of the awards. The 2011 Plan retains the remaining share authority of the two previous plans as of the date the 2011 Plan was approved by stockholders. Awards relating to not more than approximately 23.2 million shares of common stock, plus shares remaining unused under certain pre-existing plans, may be made over the life of the 2011 Plan.

Our current practice is to grant non-qualified stock options, restricted stock units and/or performance stock units on an annual basis to senior executives and a limited number of other employees as part of their total compensation. We also grant restricted stock units during the year to new hires or as retention awards for certain employees. We have not granted restricted stock since 2005.

Stock Options: Options granted under the 2011 Plan may be designated as either incentive stock options or non-qualified stock options. The Compensation Committee determines the terms and conditions of the option, including the time or times at which an option may be exercised, the methods by which such exercise price may be paid, and the form of such payment. Options are generally granted with an exercise price equal to the market value of the Company's common stock on the date of grant. These option awards generally vest 25% per annum and have a contractual term of 10 years. Certain stock options granted under the previous equity incentive plans provided for a market-based triggering event before a vested option can be exercised. The terms and conditions of these stock option awards provided that (i) options will vest at a rate of 25% a year beginning one year from the date of grant and (ii) each vested tranche will only become exercisable if the market price of the Company stock appreciates to a level of 15% above the exercise price of the option and maintains that level for at least ten (10) consecutive trading days after the award has vested. The Company accounts for these awards as market-condition options. The effect of the market condition is reflected in the grant-date fair value of such awards. Compensation cost is recognized over the requisite service period and is not subsequently adjusted if the market condition is not met. For awards without a market-based triggering event, compensation cost is generally recognized on a straight-line basis over the requisite service period which is normally the vesting period.

The estimated fair value of options granted without a market-based triggering event is calculated using the Black-Scholes option pricing valuation model. This model takes into account several factors and assumptions. The risk-free interest rate is based on the yield on U.S. Treasury zero-coupon issues with a remaining term equal to the expected life assumption at the time of grant. The expected life (estimated period of time outstanding) is estimated using the contractual term of the option and the effects of employees' expected exercise and post-vesting employment termination behavior. The Company uses a blended volatility rate based on the following: (i) volatility derived from daily closing price observations for the 10-year period ended on the valuation date, (ii) implied volatility derived from traded options for the period one week before the valuation date and (iii) average volatility for the 10-year periods ended on 15 anniversaries prior to the valuation date, using daily closing price observations. The expected dividend yield is based on expected dividends for the expected term of the stock options.

35

The assumptions used in the Black-Scholes option pricing valuation model for options granted by the Company in 2012, 2011 and 2010 are as follows:

	2012	2011	2010
Risk-free interest rate	1.26%-1.27%	2.28%-2.90%	3.15%-3.20%
Expected life (in years)	6.50	6.75	6.75
Expected volatility	26.2%-26.4%	25.4%-25.8%	26.3%-27.6%
Expected dividend yield	2.76%-2.80%	2.75%-2.86%	3.26%-3.52%

The estimated fair value of options granted with a market-based triggering event is calculated using a binomial valuation model. The factors and assumptions used in this model are similar to those utilized in the Black-Scholes option pricing valuation model except that the risk-free interest rate is based on the U.S. Treasury zero-coupon yield curve over the contractual term of the option, and the expected life is calculated by the model. Since 2009, there have been no options granted with a market-based triggering event.

A summary of the status of the Company’s stock option awards as of December 31, 2012 and changes during the year then ended is presented below:

	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value ($000)
Balance at January 1, 2012	38,895,109		$	29.21
Granted	3,547,733		$	31.88
Exercised	(6,892,731	)	$	26.01
Canceled or exchanged	—		—
Forfeited	(860,022	)	$	27.69
Expired	(2,644,296	)	$	42.85
Balance at December 31, 2012	32,045,793		$	29.10	4.5 years	186,467
Options vested or expected to vest at December 31, 2012	32,004,297		$	29.12	4.4 years	185,871
Options exercisable at December 31, 2012	16,115,605		$	28.85	3.8 years	106,606

In the above table, forfeited options are unvested options whose requisite service period has not been met. Expired options are vested options that were not exercised. The weighted-average grant-date fair value of the Company's option awards granted during the years ended December 31, 2012, 2011 and 2010 was $6.04, $6.67 and $4.85, respectively. The total intrinsic value of options exercised during the same periods was $57.7 million, $23.6 million and $0.5 million, respectively.

As of December 31, 2012, there was $18 million of unrecognized compensation cost related to the Company's option awards. The weighted-average period over which that cost is expected to be recognized is approximately 1.3 years. Cash received from the exercise of stock options for the years ended December 31, 2012, 2011 and 2010 was $179.3 million, $111.7 million and $1.5 million, respectively.

The Company's policy is to issue treasury shares upon option exercises or share unit conversion. The

Company intends to issue treasury shares as long as an adequate number of those shares are available.

Restricted Stock Units and Performance Stock Units: Restricted stock units may be awarded under the Company's 2011 Incentive and Stock Award Plan. The Compensation Committee determines the restrictions on such units, when the restrictions lapse, when the units vest and are paid, and under what terms the units are forfeited. The cost of these awards is amortized over the vesting period, which is generally three years. Awards to senior executives and other employees may include three-year

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performance-based restricted stock units and three-year service-based restricted stock units. The payout of performance-based restricted stock units (payable in shares of the Company's common stock) may range, generally, from 0-200% of the number of units granted, based on the achievement of objective, pre-determined Company or operating company performance measures, generally, over a three-year performance period. The Company accounts for these awards as performance condition restricted stock units. The performance condition is not considered in the determination of grant date fair value of such awards. Compensation cost is recognized over the performance period based on management's estimate of the number of units expected to vest and is adjusted to reflect the actual number of shares paid out at the end of the three-year performance period. Beginning with awards granted on or after February 23, 2009, dividend equivalents are not paid out unless and until such time that the award vests.

A summary of the status of the Company's restricted stock units and performance stock units as of December 31, 2012 and changes during the period then ended is presented below:

	Restricted Stock Units				Performance Stock Units
	Shares		Weighted Average Grant Date Fair Value		Shares		Weighted Average Grant Date Fair Value
Non-vested balance at January 1, 2012	15,058,428		$	25.43	368,346		$	30.60
Granted	2,797,287		$	31.96	461,756		$	31.89
Vested	(8,209,388	)	$	23.97	(25,129	)	$	30.83
Forfeited	(682,089	)	$	28.49	(81,075	)	$	31.31
Adjustment due to performance	—		$	—	6,940		$	30.60
Non-vested balance at December 31, 2012	8,964,238		$	28.58	730,838		$	31.32

The weighted-average grant-date fair value of the Company's restricted stock units and performance stock units granted during the year ended December 31, 2011 was $30.46 and $30.60, respectively; the combined weighted-average grant-date fair value of the Company's restricted stock units and performance stock units granted during the year ended December 31, 2010 was $22.81. The total fair value of the shares distributed during the years ended December 31, 2012, 2011 and 2010 in connection with the Company's restricted stock units and performance stock units was $262.6 million, $249 million and $170.7 million, respectively.

The number of vested performance stock units includes any applicable performance adjustment shares. The adjustment due to performance reflects the incremental portion of the above-target payout (160%) of performance stock units awarded in February 2011 that vested during 2012 either in full or on a pro-rata basis due to certain types of termination of employment. There is no adjustment due to performance for performance stock units awarded in February 2012 that vested during 2012 due to certain types of termination of employment within the calendar year of grant since the payout of such awards is at 100% of target under the award's terms and conditions.

Restricted Stock: Restricted shares of the Company's common stock may be awarded under the 2011 Plan and are subject to restrictions on transferability and other restrictions, if any, as the Compensation Committee may impose. The Compensation Committee may also determine when and under what circumstances the restrictions may lapse and whether the participant receives the rights of a stockholder, including, without limitation, the right to vote and receive dividends. Unless the Compensation Committee determines otherwise, restricted stock that is still subject to restrictions is forfeited upon termination of employment. Shares granted, generally become unrestricted at the earlier of: (1) January 1 of the year following the vesting grant date anniversary or (2) the later of the recipient's normal or actual retirement date. For shares granted prior to 2004, the vesting grant date anniversary is ten years. For shares granted during 2004 and 2005, the vesting grant date anniversary is 7 years and 5 years, respectively. However, certain restricted shares granted in 2005 vested on the third anniversary of the grant date. There have been no restricted shares granted since 2005.

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A summary of the status of the Company's restricted stock awards as of December 31, 2012 and changes during the period then ended is presented below:

	Shares		Weighted Average Grant Date Fair Value
Non-vested balance at January 1, 2012	51,700		$	46.86
Granted	—		$	—
Vested	(20,000	)	$	46.14
Forfeited	—		$	—
Non-vested balance at December 31, 2012	31,700		$	47.31

The total fair value of the Company's restricted stock distributed was $0.6 million for each of the years ended December 31, 2012 and December 31, 2011. There were no restricted stock distributions in 2010.

As of December 31, 2012, there was $135 million of unrecognized compensation cost related to the Company's restricted stock, restricted stock units and performance stock unit awards. The weighted-average period over which that cost is expected to be recognized is approximately 1 year.

Marsh & McLennan Companies Stock Purchase Plans

In May 1999, the Company's stockholders approved an employee stock purchase plan (the “1999 Plan”) to replace the 1994 Employee Stock Purchase Plan (the “1994 Plan”), which terminated on September 30, 1999 following its fifth annual offering. Under the current terms of the Plan, shares are purchased four times during the plan year at a price that is 95% of the average market price on each quarterly purchase date. Under the 1999 Plan, after including the available remaining unused shares in the 1994 Plan and reducing the shares available by 10,000,000 consistent with the Company's Board of Directors' action in March 2007, no more than 35,600,000 shares of the Company's common stock may be sold. Employees purchased 899,424 shares during the year ended December 31, 2012 and at December 31, 2012, 4,136,312 shares were available for issuance under the 1999 Plan. Under the 1995 Company Stock Purchase Plan for International Employees (the “International Plan”), after reflecting the additional 5,000,000 shares of common stock for issuance approved by the Company's Board of Directors in July 2002, and the addition of 4,000,000 shares due to a shareholder action in May 2007, no more than 12,000,000 shares of the Company's common stock may be sold. Employees purchased 111,073 shares during the year ended December 31, 2012 and there were 3,085,961 shares available for issuance at December 31, 2012 under the International Plan. The plans are considered non-compensatory.

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 in ASC Topic No. 820 (“Fair Value Measurements and Disclosures”). 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, most U.S. Government and agency securities, money market mutual funds and certain other sovereign government obligations).

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Assets and liabilities utilizing Level 1 inputs include exchange traded equity securities and mutual funds.

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

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

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

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

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

Assets and liabilities utilizing Level 2 inputs include corporate and municipal bonds, senior notes and interest rate swaps.

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 (examples include private equity investments, certain commercial mortgage whole loans, and long-dated or complex derivatives including certain foreign exchange options and long-dated options on gas and power).

Liabilities utilizing Level 3 inputs include liabilities for contingent purchase consideration.

Valuation Techniques

Equity Securities & Mutual Funds - Level 1

Investments for which market quotations are readily available are valued at the sale price on their principal exchange, or official closing bid price for certain markets. If no sales are reported, the security is valued at its last reported bid price.

Other Sovereign Government Obligations, Municipal Bonds and Corporate Bonds - Level 2

The investments listed in the caption above are valued on the basis of valuations furnished by an independent pricing service approved by the trustees or dealers. Such services or dealers determine valuations for normal institutional-size trading units of such securities using methods based on market transactions for comparable securities and various relationships, generally recognized by institutional traders, between securities.

Interest Rate Swap Derivative - Level 2

The fair value of interest rate swap derivatives is based on the present value of future cash flows at each valuation date resulting from utilization of the swaps, using a constant discount rate of 1.6% compared to discount rates based on projected future yield curves (See Note 12).

Senior Notes due 2014 - Level 2

The fair value of the first $250 million of Senior Notes maturing in 2014 is estimated to be the carrying value of those notes adjusted by the fair value of the interest rate swap derivative, discussed above. In the first quarter of 2011, the Company entered into two interest rate swaps to convert interest on a portion of its Senior Notes from a fixed rate to a floating rate. The swaps are designated as fair value hedging instruments. The change in the fair value of the swaps is recorded on the balance sheet. The carrying value of the debt related to these swaps is adjusted by an equal amount (See Note 12).

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Contingent Purchase Consideration Liability - Level 3

Purchase consideration for some acquisitions made by the Company includes contingent consideration arrangements. Contingent consideration arrangements are primarily based on meeting EBITDA and revenue targets over periods from two to four years. The fair value of contingent consideration is estimated as the present value of future cash flows that would result from the projected revenue and earnings 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 December 31, 2012 and 2011.

(In millions of dollars)	Identical Assets (Level 1)				Observable Inputs (Level 2)				Unobservable Inputs (Level 3)				Total
	12/31/12		12/31/11		12/31/12		12/31/11		12/31/12		12/31/11		12/31/12		12/31/11
Assets:
Financial instruments owned:
Mutual funds(a)	$	139	$	134	$	—	$	—	$	—	$	—	$	139	$	134
Money market funds(b)	483		226		—		—		—		—		483		226
Interest rate swap derivatives(c)	—		—		6		7		—		—		6		7
Total assets measured at fair value	$	622	$	360	$	6	$	7	$	—	$	—	$	628	$	367
Fiduciary Assets:
State and local obligations (including non-U.S. locales)	$	—	$	—	$	3	$	13	$	—	$	—	$	3	$	13
Other sovereign government obligations and supranational agencies	—		—		—		47		—		—		—		47
Corporate and other debt	—		—		—		2		—		—		—		2
Money market funds	149		186		—		—		—		—		149		186
Total fiduciary assets measured at fair value	$	149	$	186	$	3	$	62	$	—	$	—	$	152	$	248
Liabilities:
Contingent purchase consideration liability(d)	$	—	$	—	$	—	$	—	$	63	$	110	$	63	$	110
Senior Notes due 2014(e)	$	—	$	—	$	256	$	257	$	—	$	—	$	256	$	257
Total liabilities measured at fair value	$	—	$	—	$	256	$	257	$	63	$	110	$	319	$	367

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

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

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

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

(e) Included in long term debt in the consolidated balance sheets.

During the year ended December 31, 2012, there were no assets or liabilities that transferred between Level 1 and Level 2 or between Level 2 and Level 3.

The table below sets forth a summary of the changes in fair value of the Company’s Level 3 liabilities for the years ended December 31, 2012 and December 31, 2011 that represent contingent purchase consideration related to acquisitions:

(In millions of dollars)	2012			2011
Balance at January 1,	$	110		$	106
Additions	27			14
Payments	(30		)	(13		)
Revaluation Impact	(44		)	3
Balance at December 31,	$	63		$	110

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The fair value of the contingent purchase consideration liability is based on projections of revenue and earnings for the acquired entities that are 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 purchase consideration liability, the Company recorded a net reduction in the estimated fair value of such liabilities for acquisitions made in prior periods of $44 million for the year ended December 31, 2012. A 5% increase in the above mentioned projections would increase the liability by approximately $30 million. A 5% decrease in the above mentioned projections would decrease the liability by approximately $20 million.

Fair Value of Long-term Investments

The Company has certain long-term investments, primarily related to investments in non-publicly traded private equity funds of $16 million and $38 million at December 31, 2012 and December 31, 2011, respectively, carried on the cost basis for which there are no readily available market prices. The carrying values of these investments approximates fair value. Management's estimate of the fair value of these non-publicly traded investments is based on valuation methodologies including estimates from private equity managers of the fair value of underlying investments in private equity funds. The ability to accurately predict future cash flows, revenue or earnings may impact the determination of fair value. The Company monitors these investments for impairment and makes appropriate reductions in carrying values when necessary. These investments would be classified as Level 3 in the fair value hierarchy and are included in Other assets in the consolidated balance sheets. The Company also has investments in publicly traded mutual funds of $19 million and $20 million at December 31, 2012 and December 31, 2011, related to voluntary deferred contribution plans. These investments are classified as Level 1 in the fair value hierarchy and are included in Other assets in the consolidated balance sheets.

11.    Long-term Commitments

The Company leases office facilities, equipment and automobiles under non-cancelable operating leases. These leases expire on varying dates; in some instances contain renewal and expansion options; do not restrict the payment of dividends or the incurrence of debt or additional lease obligations; and contain no significant purchase options. In addition to the base rental costs, occupancy lease agreements generally provide for rent escalations resulting from increased assessments for real estate taxes and other charges. Approximately 98% of the Company’s lease obligations are for the use of office space.

The consolidated statements of income include net rental costs of $416 million, $430 million and $421 million for 2012, 2011 and 2010, respectively, after deducting rentals from subleases ($10 million in 2012, $9 million in 2011 and $8 million in 2010). These net rental costs exclude rental costs and sublease income for previously accrued restructuring charges related to vacated space.

At December 31, 2012, the aggregate future minimum rental commitments under all non-cancelable operating lease agreements are as follows:

For the Years Ended December 31,	Gross Rental Commitments		Rentals from Subleases		Net Rental Commitments
(In millions of dollars)
2013	$	404	$	49	$	355
2014	$	359	$	48	$	311
2015	$	315	$	43	$	272
2016	$	279	$	42	$	237
2017	$	236	$	40	$	196
Subsequent years	$	1,227	$	109	$	1,118

The Company has entered into agreements, primarily with various service companies, to outsource certain information systems activities and responsibilities and processing activities. Under these agreements, the Company is required to pay minimum annual service charges. Additional fees may be payable depending upon the volume of transactions processed, with all future payments subject to increases for inflation. At December 31, 2012, the aggregate fixed future minimum commitments under these agreements are as follows:

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For the Years Ended December 31,	Future Minimum Commitments
(In millions of dollars)
2013	$	168
2014	87
2015	48
Subsequent years	118
	$	421

12.    Debt

The Company’s outstanding debt is as follows:

December 31,
(In millions of dollars)	2012		2011
Short-term:
Current portion of long-term debt	$	260	$	260
Long-term:
Senior notes – 6.25% due 2012 (5.1% effective interest rate)	$	—	$	250
Senior notes – 4.850% due 2013	250		251
Senior notes – 5.875% due 2033	296		296
Senior notes – 5.375% due 2014	326		326
Senior notes – 5.75% due 2015	479		479
Senior notes – 2.30% due 2017	249		—
Senior notes – 9.25% due 2019	398		398
Senior notes – 4.80% due 2021	497		496
Mortgage – 5.70% due 2035	422		431
Other	1		1
	2,918		2,928
Less current portion	260		260
	$	2,658	$	2,668

The senior notes in the table above are publically registered by the Company with no guarantees attached.

During the first quarter of 2012, the Company repaid its 6.25% fixed rate $250 million senior notes that matured. The Company used proceeds from the issuance of 2.3%five-year $250 million senior notes in the first quarter of 2012 to fund the maturing notes.

On July 15, 2011, the Company purchased a total of $600 million of outstanding notes comprised of $330 million of its 5.375% notes due in 2014 and $270 million of its 5.750% notes due in 2015. The Company acquired the notes at market value plus a tender premium, which exceeded the notes' carrying values.

The Company used proceeds from the issuance of 4.80%ten-year $500 million senior notes in the third quarter of 2011 and cash on hand to fund the amounts associated with the tendered bonds.

In February 2013, the Company repaid $250 million of maturing senior notes.

The Company and certain of its foreign subsidiaries maintain a $1.0 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 requires the Company to maintain certain

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coverage and leverage ratios which are measured quarterly. There were no borrowings outstanding under this facility at December 31, 2012.

In December 2012, the Company closed on a $50 million, three-year delayed draw term loan facility. The interest rate on this facility is based on LIBOR plus a fixed margin which varies with the Company's credit ratings. The Company has the ability to increase the loan amount by $100 million during the life of the loan. The facility requires the Company to maintain coverage ratios and leverage ratios consistent with the revolving credit facility discussed above. There were no borrowings under this facility at December 31, 2012.

Derivative Financial Instruments

In February 2011, the Company entered into two$125 million3.5-year interest rate swaps to hedge changes in the fair value of the first $250 million of the outstanding 5.375% senior notes due in 2014.

Under the terms of the swaps, the counter-parties will pay the Company a fixed rate of 5.375% and the Company will pay interest at a floating rate of three-month LIBOR plus a fixed spread of 3.726%. The maturity date of the senior notes and the swaps match exactly. The floating rate resets quarterly, with every second reset occurring on the interest payment date of the senior notes. The swaps net settle every six months on the senior note coupon payment dates. The swaps are designated as fair value hedging instruments and are deemed to be perfectly effective in accordance with applicable accounting guidance. The fair value of the swaps at inception was zero and subsequent changes in the fair value of the interest rate swaps are reflected in the carrying value of the interest rate swaps and in the consolidated balance sheet. The carrying value of the debt on the balance sheet was adjusted by an equal amount. The gain or loss on the hedged item (fixed rate debt) and the offsetting gain or (loss) on the interest rate swaps for the periods ended December 31, 2012 and December 31, 2011 is as follows:

	2012							2011
Income statement classification (In millions of dollars)	Loss on Swaps			Gain on Notes		Net Income Effect		Gain on Swaps		Loss on Notes			Net Income Effect
Other Operating Expenses	$	(1	)	$	1	$	—	$	7	$	(7	)	$	—

The amounts earned and owed under the swap agreements are accrued each period and are reported in interest expense. There was no ineffectiveness recognized in the periods presented. The portion of the debt acquired under the tender offer discussed above was not part of the first $250 million outstanding and therefore, did not impact the hedged portion of this debt.

Additional credit facilities, guarantees and letters of credit are maintained with various banks, primarily related to operations located outside the United States, aggregating $247 million at December 31, 2012 and $248 million at December 31, 2011. There were no outstanding borrowings under these facilities at December 31, 2012 or December 31, 2011.

Scheduled repayments of long-term debt in 2013 and in the four succeeding years are $260 million, $330 million, $491 million, $11 million and $262 million, respectively.

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.

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	December 31, 2012				December 31, 2011
(In millions of dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Short-term debt	$	260	$	261	$	260	$	261
Long-term debt	$	2,658	$	2,986	$	2,668	$	2,958

The fair value of the Company’s short-term debt, which consists primarily of term debt maturing within the next year, 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.    Integration and Restructuring Costs

In 2012, the Company implemented restructuring actions which resulted in costs totaling $78 million. Approximately $58 million of the restructuring charges are related to Mercer, approximately $51 million of which was incurred in the fourth quarter of 2012 related to senior management's recent operations review, including costs of approximately $16 million related to the disposal of Mercer's Canadian outsourcing business. The remaining restructuring costs consist primarily of severance and benefits, costs for future rent and other real estate costs. These costs were incurred as follows: Risk and Insurance Services—$8 million (all acquisition related); Consulting—$58 million (acquisition related—$1 million); and Corporate—$12 million.

Details of the restructuring liability activity from January 1, 2011 through December 31, 2012, including actions taken prior to 2012 are as follows:

(In millions of dollars)	Balance at 1/1/11		Expense Incurred		Cash Paid			Other			Balance at 12/31/11		Expense Incurred		Cash Paid			Other			Balance at 12/31/12
Severance	$	40	$	29	$	(40	)	$	(2	)	$	27	$	46	$	(38	)	$	1		$	36
Future rent under non-cancelable leases and other costs	171		22		(42		)	3			154		32		(50		)	(2		)	134
Total	$	211	$	51	$	(82	)	$	1		$	181	$	78	$	(88	)	$	(1	)	$	170

As of January 1, 2010, the liability balance related to restructuring activity was $259 million. In 2010, the Company accrued $141 million and had cash payments of $189 million related to restructuring activities that resulted in the liability balance at January 1, 2011 reported above.

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, other liabilities, or accrued compensation and employee benefits, depending on the nature of the items.

14.    Common Stock

During 2012, the Company repurchased 6.9 million shares of its common stock for total consideration of $230 million. The Company remains authorized to purchase additional shares of its common stock up to a value of $323 million. During 2011, the Company purchased 12.3 million shares of its common stock for total consideration of $361 million.

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15.    Claims, Lawsuits and Other Contingencies

Errors and Omissions Claims

The Company and its subsidiaries, particularly Marsh and Mercer, 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, and the provision of consulting services relating to the drafting and interpretation of trust deeds and other documentation governing pension plans. Certain of these claims, particularly in the U.S. and the U.K., seek damages, including punitive and treble damages, in amounts that could, if awarded, be significant. In establishing liabilities for errors and omissions claims in accordance with FASB ASC Subtopic No.450-20 (Contingencies-Loss Contingencies), the Company utilizes case level reviews by inside and outside counsel and an internal actuarial analysis 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 Related Claims

In January 2005, the Company and its subsidiary Marsh Inc. entered into a settlement agreement with the New York State Attorney General (“NYAG”) and the New York State Insurance Department to settle a civil complaint and related citation regarding Marsh's use of market service agreements with various insurance companies. The parties subsequently entered into an amended and restated settlement agreement in February 2010 that restored a level playing field for Marsh.

Numerous private party lawsuits based on similar allegations to those made in the NYAG complaint were commenced against the Company, one or more of its subsidiaries, and their current and former directors and officers. Most of these matters have been resolved. Four actions instituted by policyholders against the Company, Marsh and certain Marsh subsidiaries remain pending in federal court.

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 we operate. In the ordinary course of business we are also subject to investigations, lawsuits and/or 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 we sold in 2001. Sedgwick guaranteed payment of claims on certain policies underwritten through the Institute of London Underwriters (the “ILU”) by River Thames. The policies covered by this guarantee are 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 December 31, 2012, 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 us 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 July3, 1980 and

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October6, 1983. Certain claims have been paid under the letter of credit and we anticipate that additional claimants may seek to recover against the letter of credit.

Kroll-related Matters

Under the terms of a stock purchase agreement with Altegrity, Inc. (“Altegrity”) related to Altegrity's purchase of Kroll from the Company in August 2010, a copy of which is attached as an exhibit to the Company's Quarterly Report on Form 10-Q for the period ended June30, 2010, we agreed to provide a limited indemnity to Altegrity with respect to certain Kroll-related litigation and regulatory matters.

**********

The pending proceedings and other matters described in this Note 15 on Claims, Lawsuits and Other Contingencies may expose the Company or its subsidiaries to liability for significant monetary damages and other forms of relief. Where a loss is both probable and reasonably estimable, we establish liabilities in accordance with FASB ASC Subtopic No.450-20 (Contingencies-Loss Contingencies). Except as described above, we are 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 organizational 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. 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.

Effective January 1, 2013, the Corporate Benefits and Association businesses, previously part of Marsh's U.S. Consumer operations in the Risk and Insurance Services segment, were transferred to Mercer. Accordingly, these businesses are now part of the Consulting segment. The segment data presented below reflects the impact of this transfer as of the beginning of the earliest period presented.

Selected information about the Company’s segments and geographic areas of operation are as follows:

For the Year Ended December 31, (In millions)	Revenue				Operating Income (Loss)				Total Assets			Depreciation and Amortization		Capital Expenditures
2012 –
Risk and Insurance Services	$	6,350		(a)	$	1,334			$	9,832		$	196	$	131
Consulting	5,613			(b)	692				5,203			113		117
Total Operating Segments	11,963				2,026				15,035			309		248
Corporate / Eliminations	(39		)	(c)	(197		)	(c)	1,253		(d)	40		72
Total Consolidated	$	11,924			$	1,829			$	16,288		$	349	$	320
2011 –
Risk and Insurance Services	$	6,079		(a)	$	1,200			$	9,102		$	189	$	146
Consulting	5,487			(b)	617				4,820			112		91
Total Operating Segments	11,566				1,817				13,922			301		237
Corporate / Eliminations	(40		)	(c)	(179		)	(c)	1,532		(d)	31		43
Total Consolidated	$	11,526			$	1,638			$	15,454		$	332	$	280
2010 –
Risk and Insurance Services	$	5,557		(a)	$	957			$	9,318		$	175	$	144
Consulting	5,042			(b)	144				4,537			115		80
Total Operating Segments	10,599				1,101				13,855			290		224
Corporate / Eliminations	(49		)	(c)	(162		)	(c)	1,455		(d)	29		34
Total Consolidated	$	10,550			$	939			$	15,310		$	319	$	258

(a) Includes inter-segment revenue of $5 million, $4 million and $7 million in 2012, 2011 and 2010, respectively, interest income on fiduciary funds of $39 million, $47 million and $45 million in 2012, 2011 and 2010, respectively, and equity method income of $11 million, $14 million and $12 million in 2012, 2011 and 2010, respectively.

(b) Includes inter-segment revenue of $34 million, $36 million and $43 million in 2012, 2011 and 2010, respectively, and interest income on fiduciary funds of $4 million in 2012, 2011 and 2010.

(c) Includes results of corporate advisory and restructuring business.

(d) Corporate assets primarily include insurance recoverables, pension related assets, the owned portion of the Company headquarters building and intercompany eliminations.

47

Details of operating segment revenue are as follows:

For the Years Ended December 31,
(In millions of dollars)	2012			2011			2010
Risk and Insurance Services
Marsh	$	5,265		$	5,031		$	4,574
Guy Carpenter	1,085			1,048			983
Total Risk and Insurance Services	6,350			6,079			5,557
Consulting
Mercer	4,147			4,004			3,685
Oliver Wyman Group	1,466			1,483			1,357
Total Consulting	5,613			5,487			5,042
Total Operating Segments	11,963			11,566			10,599
Corporate/ Eliminations	(39		)	(40		)	(49		)
Total	$	11,924		$	11,526		$	10,550

Information by geographic area is as follows:

For the Years Ended December 31,
(In millions of dollars)	2012			2011			2010
Revenue
United States	$	5,300		$	5,131		$	4,708
United Kingdom	1,960			1,922			1,720
Continental Europe	1,879			1,906			1,809
Asia Pacific	1,346			1,287			1,067
Other	1,478			1,320			1,295
	11,963			11,566			10,599
Corporate/Eliminations	(39		)	(40		)	(49		)
	$	11,924		$	11,526		$	10,550

For the Years Ended December 31,
(In millions of dollars)	2012		2011		2010
Fixed Assets, Net
United States	$	494	$	505	$	511
United Kingdom	121		133		132
Continental Europe	63		65		69
Asia Pacific	62		37		43
Other	69		64		67
	$	809	$	804	$	822

48

The impact of the transfer discussed above is as follows:

	Revenue									Operating Income
	As Reported			Reclassification			Current Presentation			As Reported			Reclassification			Current  Presentation
2012 -
Risk and Insurance Services	$	6,581		$	(231	)	$	6,350		$	1,374		$	(40	)	$	1,334
Consulting	5,382			231			5,613			652			40			692
Total Operating Segments	11,963			—			11,963			2,026			—			2,026
Corporate/Eliminations	(39		)	—			(39		)	(197		)	—			(197		)
Total Consolidated	$	11,924		$	—		$	11,924		$	1,829		$	—		$	1,829
2011 -
Risk and Insurance Services	$	6,301		$	(222	)	$	6,079		$	1,229		$	(29	)	$	1,200
Consulting	5,265			222			5,487			588			29			617
Total Operating Segments	11,566			—			11,566			1,817			—			1,817
Corporate/Eliminations	(40		)	—			(40		)	(179		)	—			(179		)
Total Consolidated	$	11,526		$	—		$	11,526		$	1,638		$	—		$	1,638
2010 -
Risk and Insurance Services	$	5,764		$	(207	)	$	5,557		$	972		$	(15	)	$	957
Consulting	4,835			207			5,042			129			15			144
Total Operating Segments	10,599			—			10,599			1,101			—			1,101
Corporate/Eliminations	(49		)	—			(49		)	(162		)	—			(162		)
Total Consolidated	$	10,550		$	—		$	10,550		$	939		$	—		$	939

49

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of

Marsh & McLennan Companies, Inc.

New York, New York

We have audited the accompanying consolidated balance sheets of Marsh & McLennan Companies, Inc. and subsidiaries (the “Company”) as of December 31, 2012 and 2011, and the related consolidated statements of income, comprehensive income, cash flows and equity for each of the three years in the period ended December 31, 2012.  These financial statements are the responsibility of the Company's management.  Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States).  Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement.  An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements.  An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation.  We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such consolidated financial statements present fairly, in all material respects, the financial position of Marsh & McLennan Companies, Inc. and subsidiaries as of December 31, 2012 and 2011, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2012, in conformity with accounting principles generally accepted in the United States of America.

As discussed in Note 1 to the financial statements, the Company retrospectively adjusted segment disclosures for a transfer of business between segments effective January 1, 2013.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Company's internal control over financial reporting as of December 31, 2012, based on the criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 27, 2013 expressed an unqualified opinion on the Company's internal control over financial reporting.

/s/ Deloitte & Touche LLP

New York, New York

February 27, 2013

(May 10, 2013 as to Notes 1, 6 and 16)

50

Marsh & McLennan Companies, Inc. and Subsidiaries

SELECTED QUARTERLY FINANCIAL DATA AND

SUPPLEMENTAL INFORMATION (UNAUDITED)

	First Quarter		Second Quarter			Third Quarter		Fourth Quarter
(In millions, except per share figures)
2012:
Revenue	$	3,051	$	3,026		$	2,845	$	3,002
Operating income	$	527	$	518		$	378	$	406
Income from continuing operations	$	354	$	339		$	246	$	265
Income (loss) from discontinued operations	$	—	$	(2	)	$	1	$	(2	)
Net income attributable to the Company	$	347	$	329		$	241	$	259
Basic Per Share Data:
Income from continuing operations	$	0.64	$	0.61		$	0.44	$	0.48
Income (loss) from discontinued operations	$	—	$	(0.01	)	$	—	$	—
Net income attributable to the Company	$	0.64	$	0.60		$	0.44	$	0.48
Diluted Per Share Data:
Income from continuing operations	$	0.63	$	0.60		$	0.43	$	0.47
Income (loss) from discontinued operations	$	—	$	(0.01	)	$	0.01	$	—
Net income attributable to the Company	$	0.63	$	0.59		$	0.44	$	0.47
Dividends Paid Per Share	$	0.22	$	0.22		$	0.23	$	0.23
2011:
Revenue	$	2,884	$	2,928		$	2,806	$	2,908
Operating income	$	472	$	465		$	310	$	391
Income from continuing operations	$	319	$	286		$	133	$	244
Income from discontinued operations	$	12	$	3		$	2	$	16
Net income attributable to the Company	$	325	$	282		$	130	$	256
Basic Per Share Data:
Income from continuing operations	$	0.57	$	0.51		$	0.24	$	0.44
Income from discontinued operations	$	0.02	$	—		$	—	$	0.03
Net income attributable to the Company	$	0.59	$	0.51		$	0.24	$	0.47
Diluted Per Share Data:
Income from continuing operations	$	0.56	$	0.50		$	0.23	$	0.44
Income from discontinued operations	$	0.02	$	—		$	0.01	$	0.02
Net income attributable to the Company	$	0.58	$	0.50		$	0.24	$	0.46
Dividends Paid Per Share	$	0.21	$	0.21		$	0.22	$	0.22

As of February 22, 2013 there were 6,840 stockholders of record.

51

XML

Segment Information (Tables)

12 Months Ended

Dec. 31, 2012

Segment Information [Abstract]

Selected information and details for MMC's operating segments

Selected information about the Company’s segments and geographic areas of operation are as follows:

For the Year Ended December 31, (In millions)	Revenue				Operating Income (Loss)				Total Assets			Depreciation and Amortization		Capital Expenditures
2012 –
Risk and Insurance Services	$	6,350		(a)	$	1,334			$	9,832		$	196	$	131
Consulting	5,613			(b)	692				5,203			113		117
Total Operating Segments	11,963				2,026				15,035			309		248
Corporate / Eliminations	(39		)	(c)	(197		)	(c)	1,253		(d)	40		72
Total Consolidated	$	11,924			$	1,829			$	16,288		$	349	$	320
2011 –
Risk and Insurance Services	$	6,079		(a)	$	1,200			$	9,102		$	189	$	146
Consulting	5,487			(b)	617				4,820			112		91
Total Operating Segments	11,566				1,817				13,922			301		237
Corporate / Eliminations	(40		)	(c)	(179		)	(c)	1,532		(d)	31		43
Total Consolidated	$	11,526			$	1,638			$	15,454		$	332	$	280
2010 –
Risk and Insurance Services	$	5,557		(a)	$	957			$	9,318		$	175	$	144
Consulting	5,042			(b)	144				4,537			115		80
Total Operating Segments	10,599				1,101				13,855			290		224
Corporate / Eliminations	(49		)	(c)	(162		)	(c)	1,455		(d)	29		34
Total Consolidated	$	10,550			$	939			$	15,310		$	319	$	258

(a) Includes inter-segment revenue of $5 million, $4 million and $7 million in 2012, 2011 and 2010, respectively, interest income on fiduciary funds of $39 million, $47 million and $45 million in 2012, 2011 and 2010, respectively, and equity method income of $11 million, $14 million and $12 million in 2012, 2011 and 2010, respectively.

(b) Includes inter-segment revenue of $34 million, $36 million and $43 million in 2012, 2011 and 2010, respectively, and interest income on fiduciary funds of $4 million in 2012, 2011 and 2010.

(c) Includes results of corporate advisory and restructuring business.

(d) Corporate assets primarily include insurance recoverables, pension related assets, the owned portion of the Company headquarters building and intercompany eliminations.

Details of operating segment revenue

Details of operating segment revenue are as follows:

For the Years Ended December 31,
(In millions of dollars)	2012			2011			2010
Risk and Insurance Services
Marsh	$	5,265		$	5,031		$	4,574
Guy Carpenter	1,085			1,048			983
Total Risk and Insurance Services	6,350			6,079			5,557
Consulting
Mercer	4,147			4,004			3,685
Oliver Wyman Group	1,466			1,483			1,357
Total Consulting	5,613			5,487			5,042
Total Operating Segments	11,963			11,566			10,599
Corporate/ Eliminations	(39		)	(40		)	(49		)
Total	$	11,924		$	11,526		$	10,550

Information by geographic area

Information by geographic area is as follows:

For the Years Ended December 31,
(In millions of dollars)	2012			2011			2010
Revenue
United States	$	5,300		$	5,131		$	4,708
United Kingdom	1,960			1,922			1,720
Continental Europe	1,879			1,906			1,809
Asia Pacific	1,346			1,287			1,067
Other	1,478			1,320			1,295
	11,963			11,566			10,599
Corporate/Eliminations	(39		)	(40		)	(49		)
	$	11,924		$	11,526		$	10,550

For the Years Ended December 31,
(In millions of dollars)	2012		2011		2010
Fixed Assets, Net
United States	$	494	$	505	$	511
United Kingdom	121		133		132
Continental Europe	63		65		69
Asia Pacific	62		37		43
Other	69		64		67
	$	809	$	804	$	822

The impact of the transfer discussed above is as follows:

	Revenue									Operating Income
	As Reported			Reclassification			Current Presentation			As Reported			Reclassification			Current  Presentation
2012 -
Risk and Insurance Services	$	6,581		$	(231	)	$	6,350		$	1,374		$	(40	)	$	1,334
Consulting	5,382			231			5,613			652			40			692
Total Operating Segments	11,963			—			11,963			2,026			—			2,026
Corporate/Eliminations	(39		)	—			(39		)	(197		)	—			(197		)
Total Consolidated	$	11,924		$	—		$	11,924		$	1,829		$	—		$	1,829
2011 -
Risk and Insurance Services	$	6,301		$	(222	)	$	6,079		$	1,229		$	(29	)	$	1,200
Consulting	5,265			222			5,487			588			29			617
Total Operating Segments	11,566			—			11,566			1,817			—			1,817
Corporate/Eliminations	(40		)	—			(40		)	(179		)	—			(179		)
Total Consolidated	$	11,526		$	—		$	11,526		$	1,638		$	—		$	1,638
2010 -
Risk and Insurance Services	$	5,764		$	(207	)	$	5,557		$	972		$	(15	)	$	957
Consulting	4,835			207			5,042			129			15			144
Total Operating Segments	10,599			—			10,599			1,101			—			1,101
Corporate/Eliminations	(49		)	—			(49		)	(162		)	—			(162		)
Total Consolidated	$	10,550		$	—		$	10,550		$	939		$	—		$	939

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of

Marsh & McLennan Companies, Inc.

New York, New York

We have audited the accompanying consolidated balance sheets of Marsh & McLennan Companies, Inc. and subsidiaries (the “Company”) as of December 31, 2012 and 2011, and the related consolidated statements of income, comprehensive income, cash flows and equity for each of the three years in the period ended December 31, 2012.  These financial statements are the responsibility of the Company's management.  Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States).  Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement.  An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements.  An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation.  We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such consolidated financial statements present fairly, in all material respects, the financial position of Marsh & McLennan Companies, Inc. and subsidiaries as of December 31, 2012 and 2011, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2012, in conformity with accounting principles generally accepted in the United States of America.

As discussed in Note 1 to the financial statements, the Company retrospectively adjusted segment disclosures for a transfer of business between segments effective January 1, 2013.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Company's internal control over financial reporting as of December 31, 2012, based on the criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 27, 2013 expressed an unqualified opinion on the Company's internal control over financial reporting.

/s/ Deloitte & Touche LLP

New York, New York

February 27, 2013

(May 10, 2013 as to Notes 1, 6 and 16)

Marsh & McLennan Companies, Inc. and Subsidiaries

SELECTED QUARTERLY FINANCIAL DATA AND

SUPPLEMENTAL INFORMATION (UNAUDITED)

	First Quarter		Second Quarter			Third Quarter		Fourth Quarter
(In millions, except per share figures)
2012:
Revenue	$	3,051	$	3,026		$	2,845	$	3,002
Operating income	$	527	$	518		$	378	$	406
Income from continuing operations	$	354	$	339		$	246	$	265
Income (loss) from discontinued operations	$	—	$	(2	)	$	1	$	(2	)
Net income attributable to the Company	$	347	$	329		$	241	$	259
Basic Per Share Data:
Income from continuing operations	$	0.64	$	0.61		$	0.44	$	0.48
Income (loss) from discontinued operations	$	—	$	(0.01	)	$	—	$	—
Net income attributable to the Company	$	0.64	$	0.60		$	0.44	$	0.48
Diluted Per Share Data:
Income from continuing operations	$	0.63	$	0.60		$	0.43	$	0.47
Income (loss) from discontinued operations	$	—	$	(0.01	)	$	0.01	$	—
Net income attributable to the Company	$	0.63	$	0.59		$	0.44	$	0.47
Dividends Paid Per Share	$	0.22	$	0.22		$	0.23	$	0.23
2011:
Revenue	$	2,884	$	2,928		$	2,806	$	2,908
Operating income	$	472	$	465		$	310	$	391
Income from continuing operations	$	319	$	286		$	133	$	244
Income from discontinued operations	$	12	$	3		$	2	$	16
Net income attributable to the Company	$	325	$	282		$	130	$	256
Basic Per Share Data:
Income from continuing operations	$	0.57	$	0.51		$	0.24	$	0.44
Income from discontinued operations	$	0.02	$	—		$	—	$	0.03
Net income attributable to the Company	$	0.59	$	0.51		$	0.24	$	0.47
Diluted Per Share Data:
Income from continuing operations	$	0.56	$	0.50		$	0.23	$	0.44
Income from discontinued operations	$	0.02	$	—		$	0.01	$	0.02
Net income attributable to the Company	$	0.58	$	0.50		$	0.24	$	0.46
Dividends Paid Per Share	$	0.21	$	0.21		$	0.22	$	0.22

As of February 22, 2013 there were 6,840 stockholders of record.

XML

Acquisitions (Pro-Forma Information) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Acquisitions [Abstract]
Revenue	$ 12,013	$ 11,778	$ 10,839
Income from continuing operations	1,214	990	580
Net income attributable to the Company	$ 1,187	$ 1,001	$ 870
Basic net income per share - Continuing operations	$ 2.18	$ 1.78	$ 1.03
Basic net income per share - Net income attributable to the Company	$ 2.18	$ 1.84	$ 1.59
Diluted net income per share - Continuing operations	$ 2.15	$ 1.75	$ 1.02
Diluted net income per share - Net income attributable to the Company	$ 2.14	$ 1.81	$ 1.57

XML

Supplemental Disclosures (Schedule of Supplemental Cash Flow Income Statement Disclosures) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Cash Flow Information [Abstract]
Net cash provided by (used for) operations	$ 0	$ 11	$ (6)
Net cash used for investing activities	0	0	(14)
Effect of exchange rate changes on cash and cash equivalents	$ 0	$ 0	$ (2)

XML

Retirement Benefits (Schedules Providing Information Concerning MMC's Defined Benefit Pension Plans and Postretirement Benefit Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Noncurrent assets	$ 260	$ 39
Noncurrent liabilities	(2,094)	(1,655)
Total amounts included in accumulated other comprehensive income	3,451	3,152
U.S. Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	4,533	4,041
Service cost	93	83	76
Interest cost	230	231	227
Employer/Company contributions	124	24
Actuarial loss	522	352
Medicare Part D subsidy	0	0
Benefits paid	(181)	(174)
Benefit obligation at end of year	5,197	4,533	4,041
Fair value of plan assets at beginning of year	3,493	3,444
Actual return on plan assets	500	199
Fair value of plan assets at end of year	3,936	3,493	3,444
Funded status	(1,261)	(1,040)
Current liabilities	(25)	(124)
Noncurrent liabilities	(1,236)	(916)
Unrecognized prior service credit	23	39	55
Net actuarial (loss) gain	(1,887)	(1,695)	(1,327)
Total amounts included in accumulated other comprehensive income	(1,864)	(1,656)
Cumulative employer contributions in excess (deficient) of net periodic cost	603	616
Net (liability) asset recognized	(1,261)	(1,040)
Accumulated benefit obligation at December 31	5,114	4,467
U.S. Postretirement Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	162	180
Service cost	3	3	3
Interest cost	8	8	10
Employer/Company contributions	10	9
Actuarial loss	13	(20)
Medicare Part D subsidy	3	4
Benefits paid	(13)	(13)
Benefit obligation at end of year	176	162	180
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Fair value of plan assets at end of year	0	0	0
Funded status	(176)	(162)
Current liabilities	(9)	(9)
Noncurrent liabilities	(167)	(153)
Unrecognized prior service credit	0	13	26
Net actuarial (loss) gain	(2)	12	(4)
Total amounts included in accumulated other comprehensive income	(2)	25
Cumulative employer contributions in excess (deficient) of net periodic cost	(174)	(187)
Net (liability) asset recognized	(176)	(162)
Accumulated benefit obligation at December 31	0	0
Non- U.S Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	7,717	6,802
Service cost	147	143	121
Interest cost	366	378	351
Employee contributions	11	14
Employer/Company contributions	389	320
Actuarial loss	419	575
Plan amendments	(71)	(3)
Effect of Settlement	(11)	(7)
Effect of curtailment	(3)	(1)
Special termination benefits	0	0	1
Benefits paid	(278)	(266)
Foreign Currency Charges	280	66
Other	2	16
Other	1	10
Benefit obligation at end of year	8,579	7,717	6,802
Fair value of plan assets at beginning of year	7,206	6,741
Actual return on plan assets	721	311
Effect of settlement	(11)	(6)
Foreign currency changes	273	82
Fair value of plan assets at end of year	8,312	7,206	6,741
Funded status	(267)	(511)
Noncurrent assets	258	39
Current liabilities	(6)	(106)
Noncurrent liabilities	(519)	(444)
Unrecognized prior service credit	93	23	23
Net actuarial (loss) gain	(3,309)	(3,038)	(2,305)
Total amounts included in accumulated other comprehensive income	(3,216)	(3,015)
Cumulative employer contributions in excess (deficient) of net periodic cost	2,949	2,504
Net (liability) asset recognized	(267)	(511)
Accumulated benefit obligation at December 31	8,229	7,246
Non- U.S Postretirement Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	91	83
Service cost	2	2	1
Interest cost	5	5	4
Employee contributions	0	0
Employer/Company contributions	4	4
Actuarial loss	10	5
Plan amendments	0	0
Effect of Settlement	0	0
Effect of curtailment	(1)	0
Special termination benefits	0	0	0
Benefits paid	(4)	(4)
Foreign Currency Charges	4	0
Other	0	0
Other	0	0
Benefit obligation at end of year	107	91	83
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Effect of settlement	0	0
Foreign currency changes	0	0
Fair value of plan assets at end of year	0	0	0
Funded status	(107)	(91)
Noncurrent assets	0	0
Current liabilities	(4)	(4)
Noncurrent liabilities	(103)	(87)
Unrecognized prior service credit	0	1	1
Net actuarial (loss) gain	(27)	(19)	(14)
Total amounts included in accumulated other comprehensive income	(27)	(18)
Cumulative employer contributions in excess (deficient) of net periodic cost	(80)	(73)
Net (liability) asset recognized	(107)	(91)
Accumulated benefit obligation at December 31	$ 0	$ 0

XML

Discontinued Operations (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2010	Dec. 31, 2011	Dec. 31, 2011 Business Process Outsourcing [Member]	Dec. 31, 2010 Kroll Divestiture [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operation, settlement of tax audits		$ 50
Capitalized Computer Software, Impairments			17
Provision/ (credit) for income taxes				36
deferred tax benefit	$ 265

XML

Stock Benefit Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended					12 Months Ended																	1 Months Ended	3 Months Ended	12 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member] Shares granted prior to 2004 [Member]	Dec. 31, 2012 Restricted Stock [Member] Shares granted during 2004 [Member]	Dec. 31, 2012 Restricted Stock [Member] Shares granted during 2005 [Member]	Dec. 31, 2012 Restricted Stock [Member] Certain grants in 2005 [Member]	Dec. 31, 2012 Restricted Stock Units And Performance Stock Units [Member]	Dec. 31, 2012 Restricted Stock Units And Performance Stock Units [Member] Shares granted prior to 2004 [Member]	Dec. 31, 2011 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2010 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2012 Performance Units [Member]	Dec. 31, 2011 Performance Units [Member]	Dec. 31, 2006 Performance Units [Member]	Dec. 31, 2012 Deferred Stock Units [Member]	Dec. 31, 2011 Deferred Stock Units [Member]	Dec. 31, 2010 Deferred Stock Units [Member]	Dec. 31, 2012 Stock Options [Member]	Mar. 16, 2005 Stock Options [Member]	Dec. 31, 2012 Executive Plan 2000 [Member]	Mar. 31, 2007 Employee Stock Purchase Plan 1999 [Member]	Dec. 31, 2012 Employee Stock Purchase Plan 1999 [Member]	Dec. 31, 2012 Employee Stock Purchase Plan 1999 [Member]	May 31, 2007 International Plan [Member]	Dec. 31, 2012 International Plan [Member]	Dec. 31, 2012 International Plan [Member]
Awards made over the life of the plan																						23,200,000
Stock options vesting percentage																				25.00%	25.00%
Contractual term of stock option awards	10 years
Stock appreciation percentage above exercise price																				15.00%
Weighted-average grant-date fair value	$ 6.04	$ 6.67	$ 4.85									$ 30.46	$ 22.81		$ 30.60
Total intrinsic value of options exercised	$ 57.7	$ 23.6	$ 0.5
Unrecognized compensation cost related to option awards				135																18
Weighted-average period over which that cost is expected to be recognized, years										1 year										1 year 3 months 18 days
Cash received from the exercise of stock options	179.3	111.7	1.5
Performance-based restricted stock unit payable range minimum																0.00%
Performance-based restricted stock unit payable range maximum																200.00%
Total fair value of deferred stock units																	262.6	249.0	170.7
Performance Based Restricted Stock Unit Payout, Above Target Percentage														160.00%
Performance Based Restricted Stock Unit Payout, Target Percentage														100.00%
Vesting period, years						10 years	7 years	5 years	3 years		3 years
Total fair value of restricted stock					$ 0.6
Stock option price percent																									95.00%
Reduction in the shares available																									10,000,000
Issuance of common stock common stock approved by the Board of Directors																							35,600,000			12,000,000
Shares due to shareholder action																										4,000,000
Increase in number of shares available for issuance approved by Board of Directors																												5,000,000
Shares purchased by employees																								899,424			111,073
Shares available for issuance under the plan																								4,136,312	4,136,312		3,085,961	3,085,961

XML

Supplemental Disclosures (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			0 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Aug. 03, 2010 Kroll Divestiture [Member]	Dec. 31, 2011 Kroll Divestiture [Member]	Dec. 31, 2011 KLS [Member]
Supplemental Disclosures [Line Items]
Non-cash issuance of common stock	$ 193	$ 197	$ 182
Stock-based compensation expense, equity awards	152	165	174
Cash from disposal, disposition, and/or sale transaction				$ 1,130	$ 1,130	$ 110

XML

Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2012

Defined Benefit Plan Disclosure [Line Items]

Schedule of estimated future benefit payaments for its pension and postretirement benefits

The Plan’s estimated future benefit payments for its pension and postretirement benefits (without reduction for Medicare subsidy receipts) at December 31, 2012 are as follows:

December 31,	Pension Benefits				Postretirement Benefits
(In millions of dollars)	U.S.		Non-U.S.		U.S.		Non-U.S.
2013	$	210	$	275	$	11	$	4
2014	$	221	$	276	$	11	$	4
2015	$	231	$	287	$	11	$	4
2016	$	242	$	310	$	11	$	4
2017	$	251	$	321	$	11	$	5
2018-2022	$	1,394	$	1,910	$	59	$	27

Summary of the U.S. and non-U.S. plans investments measured at fair value on a recurring basis

	Fair Value Measurements at December 31, 2012
Assets (In millions of dollars)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Common/Collective trusts	$	16	$	5,376	$	—	$	5,392
Corporate obligations	—		2,236		1		2,237
Corporate stocks	2,005		4		9		2,018
Private equity/Partnerships	2		2		824		828
Government securities	9		309		—		318
Real estate	11		8		357		376
Short-term investment funds	410		4		—		414
Company common stock	276		—		—		276
Other investments	11		112		216		339
Insurance group annuity contracts	—		—		23		23
Swaps	—		4		—		4
Total investments	$	2,740	$	8,055	$	1,430	$	12,225

	Fair Value Measurements at December 31, 2011
Assets (In millions of dollars)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Common/Collective trusts	$	10	$	4,837	$	—	$	4,847
Corporate obligations	—		1,792		1		1,793
Corporate stocks	1,716		15		8		1,739
Private equity/Partnerships	—		1		779		780
Government securities	10		368		—		378
Real estate	14		4		319		337
Short-term investment funds	288		42		—		330
Company common stock	253		—		—		253
Other investments	1		34		202		237
Insurance group annuity contracts	—		—		20		20
Swaps	—		5		—		5
Total investments	$	2,292	$	7,098	$	1,329	$	10,719

Summary of changes in the fair value of the plans' Level 3 assets

The tables below set forth a summary of changes in the fair value of the plans’ Level 3 assets for the years ended December 31, 2012 and December 31, 2011:

Assets (In millions)	Fair Value, January 1, 2012		Purchases		Sales			Unrealized Gain/ (Loss)		Realized Gain/ (Loss)			Exchange Rate Impact		Transfers in/(out) and Other		Fair Value, December 31, 2012
Private equity/Partnerships	$	779	$	86	$	(79	)	$	138	$	(113	)	$	13	$	—	$	824
Real estate	319		11		(3		)	104		(86		)	12		—		357
Other investments	202		17		(24		)	11		6			4		—		216
Insurance group annuity contracts	20		160		(157		)	1		(1		)	—		—		23
Corporate stocks	8		1		—			—		—			—		—		9
Corporate obligations	1		—		—			—		—			—		—		1
Total assets	$	1,329	$	275	$	(263	)	$	254	$	(194	)	$	29	$	—	$	1,430

Assets (In millions)	Fair Value, January 1, 2011		Purchases		Sales			Unrealized Gain/ (Loss)			Realized Gain/ (Loss)			Exchange Rate Impact			Transfers in/(out) and Other			Fair Value, December 31, 2011
Private equity/Partnerships	$	746	$	119	$	(80	)	$	(83	)	$	70		$	7		$	—		$	779
Real estate	293		—		—			22			(1		)	5			—			319
Other investments	177		32		(13		)	6			2			(2		)	—			202
Insurance group annuity contracts	20		151		(150		)	8			(9		)	—			—			20
Corporate stocks	1		8		—			(1		)	—			—			—			8
Corporate obligations	8		1		(8		)	2			(1		)	—			(1		)	1
Total assets	$	1,245	$	311	$	(251	)	$	(46	)	$	61		$	10		$	(1	)	$	1,329

Combined US & Significant Non-US Plans [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of weighted average actuarial assumptions utilized defined benefit plans

The weighted average actuarial assumptions utilized for the U.S. and significant non-U.S. defined benefit plans and postretirement benefit plans are as follows:

	Pension  Benefits				Postretirement Benefits
	2012		2011		2012		2011
Weighted average assumptions:
Discount rate (for expense)	4.91	%	5.59	%	5.05	%	5.81	%
Expected return on plan assets	8.03	%	8.19	%	—		—
Rate of compensation increase (for expense)	3.09	%	4.08	%	—		—
Discount rate (for benefit obligation)	4.38	%	4.91	%	4.32	%	5.05	%
Rate of compensation increase (for benefit obligation)	2.43	%	3.09	%	—		—

Schedule of components of net periodic benefit cost for U.S. defined benefit and other postretirement benefit plans

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

Combined U.S. and significant non-U.S. Plans	Pension									Postretirement
For the Years Ended December 31,	Benefits									Benefits
(In millions of dollars)	2012			2011			2010			2012			2011			2010
Service cost	$	240		$	226		$	197		$	5		$	5		$	4
Interest cost	596			609			578			13			13			14
Expected return on plan assets	(905		)	(887		)	(815		)	—			—			—
Amortization of prior service credit	(19		)	(19		)	(21		)	(14		)	(13		)	(13		)
Recognized actuarial loss (credit)	270			215			144			—			(4		)	—
Net periodic benefit cost	$	182		$	144		$	83		$	4		$	1		$	5

U.S. Plans [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of weighted average actuarial assumptions utilized defined benefit plans

The weighted average actuarial assumptions utilized in determining the above amounts for the U.S. defined benefit and other U.S. postretirement plans as of the end of the year are as follows:

	U.S. Pension Benefits				U.S. Postretirement Benefits
	2012		2011		2012		2011
Weighted average assumptions:
Discount rate (for expense)	5.15	%	5.90	%	5.10	%	5.95	%
Expected return on plan assets	8.75	%	8.75	%	—		—
Rate of compensation increase (for expense)	2.00	%	3.90	%	—		—
Discount rate (for benefit obligation)	4.45	%	5.15	%	4.25	%	5.10	%
Rate of compensation increase (for benefit obligation)	2.00	%	2.00	%	—		—

Schedule of components of net periodic benefit cost for U.S. defined benefit and other postretirement benefit plans

The components of the net periodic benefit cost for the U.S. defined benefit and other postretirement benefit plans are as follows:

U.S. Plans only	Pension Benefits									Postretirement Benefits
For the Years Ended December 31,
(In millions of dollars)	2012			2011			2010			2012			2011			2010
Service cost	$	93		$	83		$	76		$	3		$	3		$	3
Interest cost	230			231			227			8			8			10
Expected return on plan assets	(322		)	(315		)	(295		)	—			—			—
Amortization of prior service credit	(16		)	(16		)	(18		)	(13		)	(13		)	(13		)
Recognized actuarial loss (credit)	152			100			71			(1		)	(4		)	—
Net periodic benefit cost (credit)	$	137		$	83		$	61		$	(3	)	$	(6	)	$	—

Schedule of MMC's defined benefit plans and postretirement plans

The following schedules provide information concerning the Company’s U.S. defined benefit pension plans and postretirement benefit plans:

	U.S. Pension Benefits						U.S.  Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Change in benefit obligation:
Benefit obligation at beginning of year	$	4,533		$	4,041		$	162		$	180
Service cost	93			83			3			3
Interest cost	230			231			8			8
Actuarial (gain) loss	522			352			13			(20		)
Medicare Part D subsidy	—			—			3			4
Benefits paid	(181		)	(174		)	(13		)	(13		)
Benefit obligation, December 31	$	5,197		$	4,533		$	176		$	162
Change in plan assets:
Fair value of plan assets at beginning of year	$	3,493		$	3,444		$	—		$	—
Actual return on plan assets	500			199			—			—
Employer contributions	124			24			10			9
Medicare Part D subsidy	—			—			3			4
Benefits paid	(181		)	(174		)	(13		)	(13		)
Fair value of plan assets, December 31	$	3,936		$	3,493		$	—		$	—
Net funded status, December 31	$	(1,261	)	$	(1,040	)	$	(176	)	$	(162	)
Amounts recognized in the consolidated balance sheets:
Current liabilities	$	(25	)	$	(124	)	$	(9	)	$	(9	)
Noncurrent liabilities	(1,236		)	(916		)	(167		)	(153		)
Net liability recognized, December 31	$	(1,261	)	$	(1,040	)	$	(176	)	$	(162	)
Amounts recognized in other comprehensive income (loss):
Prior service credit	$	23		$	39		$	—		$	13
Net actuarial (loss) gain	(1,887		)	(1,695		)	(2		)	12
Total recognized accumulated other comprehensive (loss) income, December 31	$	(1,864	)	$	(1,656	)	$	(2	)	$	25
Cumulative employer contributions in excess (deficient) of net periodic cost	603			616			(174		)	(187		)
Net amount recognized in consolidated balance sheet	$	(1,261	)	$	(1,040	)	$	(176	)	$	(162	)
Accumulated benefit obligation at December 31	$	5,114		$	4,467		$	—		$	—

	U.S. Pension Benefits						U.S.  Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Reconciliation of prior service credit (charge) recognized in accumulated other comprehensive income (loss):
Beginning balance	$	39		$	55		$	13		$	26
Recognized as component of net periodic benefit credit	(16		)	(16		)	(13		)	(13		)
Prior service credit, December 31	$	23		$	39		$	—		$	13

Schedule of unrecognized net actuarial gain (loss)

	U.S. Pension Benefits						U.S.  Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Reconciliation of prior service credit (charge) recognized in accumulated other comprehensive income (loss):
Beginning balance	$	39		$	55		$	13		$	26
Recognized as component of net periodic benefit credit	(16		)	(16		)	(13		)	(13		)
Prior service credit, December 31	$	23		$	39		$	—		$	13

	U.S. Pension Benefits						U.S.  Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Reconciliation of net actuarial gain (loss) recognized in accumulated other comprehensive income (loss):
Beginning balance	$	(1,695	)	$	(1,327	)	$	12		$	(4	)
Recognized as component of net periodic benefit cost	152			100			(1		)	(4		)
Changes in plan assets and benefit obligations recognized in other comprehensive income (loss):
Liability experience	(522		)	(352		)	(13		)	20
Asset experience	178			(116		)	—			—
Total gain (loss) recognized as change in plan assets and benefit obligations	(344		)	(468		)	(13		)	20
Net actuarial gain (loss), December 31	$	(1,887	)	$	(1,695	)	$	(2	)	$	12

For the Years Ended December 31,	U.S. Pension Benefits						U.S. Postretirement Benefits
(In millions of dollars)	2012		2011		2010		2012		2011			2010
Total recognized in net periodic benefit cost and other comprehensive loss (income)	$	346	$	467	$	148	$	24	$	(9	)	$	26

Schedule of total recognized in net periodic benefit cost and other comprehensive income (loss)

	U.S. Pension Benefits						U.S.  Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Reconciliation of net actuarial gain (loss) recognized in accumulated other comprehensive income (loss):
Beginning balance	$	(1,695	)	$	(1,327	)	$	12		$	(4	)
Recognized as component of net periodic benefit cost	152			100			(1		)	(4		)
Changes in plan assets and benefit obligations recognized in other comprehensive income (loss):
Liability experience	(522		)	(352		)	(13		)	20
Asset experience	178			(116		)	—			—
Total gain (loss) recognized as change in plan assets and benefit obligations	(344		)	(468		)	(13		)	20
Net actuarial gain (loss), December 31	$	(1,887	)	$	(1,695	)	$	(2	)	$	12

For the Years Ended December 31,	U.S. Pension Benefits						U.S. Postretirement Benefits
(In millions of dollars)	2012		2011		2010		2012		2011			2010
Total recognized in net periodic benefit cost and other comprehensive loss (income)	$	346	$	467	$	148	$	24	$	(9	)	$	26

Schedule of change in assumed health care cost trend rates

A one percentage point change in assumed health care cost trend rates would have the following effects:

(In millions of dollars)	1 Percentage Point Increase		1 Percentage Point Decrease
Effect on total of service and interest cost components	$	—	$	—
Effect on postretirement benefit obligation	$	1	$	(5	)

Schedule of estimated amounts that will be amortized from accumulated other comprehensive in the next fiscal year

Estimated amounts that will be amortized from accumulated other comprehensive income in the next fiscal year:

	U.S. Pension Benefits			U.S. Postretirement Benefits
(In millions of dollars)	2013			2013
Prior service cost	$	(16	)	$	—
Net actuarial loss	202			—
Projected cost	$	186		$	—

Non-U.S. Plans [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of weighted average actuarial assumptions utilized defined benefit plans

	Non-U.S. Pension Benefits				Non-U.S. Postretirement Benefits
	2012		2011		2012		2011
Weighted average assumptions:
Discount rate (for expense)	4.77	%	5.41	%	4.95	%	5.51	%
Expected return on plan assets	7.68	%	7.91	%	—		—
Rate of compensation increase (for expense)	3.73	%	4.19	%	—		—
Discount rate (for benefit obligation)	4.33	%	4.77	%	4.45	%	4.95	%
Rate of compensation increase (for benefit obligation)	2.69	%	3.73	%	—		—

Schedule of components of net periodic benefit cost for U.S. defined benefit and other postretirement benefit plans

The components of the net periodic benefit cost for the non-U.S. defined benefit and other postretirement benefit plans and the curtailment, settlement and termination expenses are as follows:

For the Years Ended December 31,	Non-U.S. Pension Benefits									Non-U.S. Postretirement Benefits
(In millions of dollars)	2012			2011			2010			2012			2011		2010
Service cost	$	147		$	143		$	121		$	2		$	2	$	1
Interest cost	366			378			351			5			5		4
Expected return on plan assets	(583		)	(572		)	(520		)	—			—		—
Amortization of prior service cost	(3		)	(3		)	(3		)	(1		)	—		—
Recognized actuarial loss	118			115			73			1			—		—
Net periodic benefit cost	45			61			22			7			7		5
Settlement loss	1			—			5			—			—		—
Curtailment credit	(1		)	—			—			—			—		—
Special termination benefits	—			—			1			—			—		—
Total cost	$	45		$	61		$	28		$	7		$	7	$	5

Schedule of unrecognized net actuarial gain (loss)

	Non-U.S. Pension Benefits						Non-U.S. Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Reconciliation of prior service credit (cost):
Beginning balance	$	23		$	23		$	1		$	1
Recognized as component of net periodic benefit credit	(3		)	3			(1		)	—
Effect of curtailment	(1		)	—			—			—
Changes in plan assets and benefit obligations recognized in other comprehensive income:
Plan amendments	71			(3		)	—			—
Exchange rate adjustments	3			—			—			—
Prior service credit, December 31	$	93		$	23		$	—		$	1

Schedule of defined benefit plans disclosures and unrecognized net actuarial gain (loss) [Table Text Block]

The following schedules provide information concerning the Company’s non-U.S. defined benefit pension plans and non-U.S. postretirement benefit plans:

	Non-U.S. Pension Benefits						Non-U.S. Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Change in benefit obligation:
Benefit obligation at beginning of year	$	7,717		$	6,802		$	91		$	83
Service cost	147			143			2			2
Interest cost	366			378			5			5
Employee contributions	11			14			—			—
Actuarial loss	419			575			10			5
Plan amendments	(71		)	(3		)	—			—
Effect of settlement	(11		)	(7		)	—			—
Effect of curtailment	(3		)	(1		)	(1		)	—
Benefits paid	(278		)	(266		)	(4		)	(4		)
Foreign currency changes	280			66			4			—
Other	2			16			—			—
Benefit obligation at, December 31	$	8,579		$	7,717		$	107		$	91
Change in plan assets:
Fair value of plan assets at beginning of year	$	7,206		$	6,741		$	—		$	—
Actual return on plan assets	721			311			—			—
Effect of settlement	(11		)	(6		)	—			—
Company contributions	389			320			4			4
Employee contributions	11			14			—			—
Benefits paid	(278		)	(266		)	(4		)	(4		)
Foreign currency changes	273			82			—			—
Other	1			10			—			—
Fair value of plan assets, December 31	$	8,312		$	7,206		$	—		$	—
Net funded status, December 31	$	(267	)	$	(511	)	$	(107	)	$	(91	)
Amounts recognized in the consolidated balance sheets:
Non-current assets	$	258		$	39		$	—		$	—
Current liabilities	(6		)	(106		)	(4		)	(4		)
Non-current liabilities	(519		)	(444		)	(103		)	(87		)
Net liability recognized, December 31	$	(267	)	$	(511	)	$	(107	)	$	(91	)
Amounts recognized in other comprehensive income (loss):
Prior service credit	$	93		$	23		$	—		$	1
Net actuarial (loss) gain	(3,309		)	(3,038		)	(27		)	(19		)
Total recognized accumulated other comprehensive (loss) income, December 31	$	(3,216	)	$	(3,015	)	$	(27	)	$	(18	)
Cumulative employer contributions in excess (deficient) of net periodic cost	2,949			2,504			(80		)	(73		)
Net amount recognized in consolidated balance sheet, December 31	$	(267	)	$	(511	)	$	(107	)	$	(91	)
Accumulated benefit obligation, December 31	$	8,229		$	7,246		$	—		$	—

	Non-U.S. Pension Benefits						Non-U.S. Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Reconciliation of prior service credit (cost):
Beginning balance	$	23		$	23		$	1		$	1
Recognized as component of net periodic benefit credit	(3		)	3			(1		)	—
Effect of curtailment	(1		)	—			—			—
Changes in plan assets and benefit obligations recognized in other comprehensive income:
Plan amendments	71			(3		)	—			—
Exchange rate adjustments	3			—			—			—
Prior service credit, December 31	$	93		$	23		$	—		$	1

	Non-U.S. Pension Benefits						Non-U.S. Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Reconciliation of net actuarial gain (loss):
Beginning balance	$	(3,038	)	$	(2,305	)	$	(19	)	$	(14	)
Recognized as component of net periodic benefit cost	118			115			1			—
Effect of settlement	1			—			—			—
Changes in plan assets and benefit obligations recognized in other comprehensive income (loss):
Liability experience	(419		)	(575		)	(10		)	(5		)
Asset experience	138			(261		)	—			—
Effect of curtailment	3			(1		)	1			—
Total amount recognized as change in plan assets and benefit obligations	(278		)	(837		)	(9		)	(5		)
Exchange rate adjustments	(112		)	(11		)	—			—
Net actuarial gain (loss), December 31	$	(3,309	)	$	(3,038	)	$	(27	)	$	(19	)

For the Years Ended December 31,	Non-U.S. Pension Benefits						Non-U.S. Postretirement Benefits
(In millions of dollars)	2012		2011		2010		2012		2011		2010
Total recognized in net periodic benefit cost and other comprehensive loss	$	246	$	792	$	66	$	16	$	12	$	15

Schedule of total recognized in net periodic benefit cost and other comprehensive income (loss)

	Non-U.S. Pension Benefits						Non-U.S. Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Reconciliation of net actuarial gain (loss):
Beginning balance	$	(3,038	)	$	(2,305	)	$	(19	)	$	(14	)
Recognized as component of net periodic benefit cost	118			115			1			—
Effect of settlement	1			—			—			—
Changes in plan assets and benefit obligations recognized in other comprehensive income (loss):
Liability experience	(419		)	(575		)	(10		)	(5		)
Asset experience	138			(261		)	—			—
Effect of curtailment	3			(1		)	1			—
Total amount recognized as change in plan assets and benefit obligations	(278		)	(837		)	(9		)	(5		)
Exchange rate adjustments	(112		)	(11		)	—			—
Net actuarial gain (loss), December 31	$	(3,309	)	$	(3,038	)	$	(27	)	$	(19	)

For the Years Ended December 31,	Non-U.S. Pension Benefits						Non-U.S. Postretirement Benefits
(In millions of dollars)	2012		2011		2010		2012		2011		2010
Total recognized in net periodic benefit cost and other comprehensive loss	$	246	$	792	$	66	$	16	$	12	$	15

Schedule of change in assumed health care cost trend rates

A one percentage point change in assumed health care cost trend rates would have the following effects:

(In millions of dollars)	1 Percentage Point Increase		1 Percentage Point Decrease
Effect on total of service and interest cost components	$	1	$	(1	)
Effect on postretirement benefit obligation	$	12	$	(10	)

Schedule of estimated amounts that will be amortized from accumulated other comprehensive in the next fiscal year

Estimated amounts that will be amortized from accumulated other comprehensive income in the next fiscal year:

	Non-U.S. Pension Benefits			Non-U.S. Postretirement Benefits
(In millions of dollars)	2013			2013
Prior service cost	$	(6	)	$	—
Net actuarial loss	112			2
Projected cost	$	106		$	2

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Stock Benefit Plans (Black-Scholes Option Pricing Valuation Model For Options) (Details) (Black-Scholes Option Pricing [Member])	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Black-Scholes Option Pricing [Member]
Risk-free interest rate, Range Minimum	1.26%	2.28%	3.15%
Risk-free interest rate, Range Maximum	1.27%	2.90%	3.20%
Expected life (in years)	6 years 6 months	6 years 9 months	6 years 9 months
Expected volatility, Range Minimum	26.20%	25.40%	26.30%
Expected volatility, Range Maximum	26.40%	25.80%	27.60%
Expected dividend yield, Range Minimum	2.76%	2.75%	3.26%
Expected dividend yield, Range Maximum	2.80%	2.86%	3.52%

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Retirement Benefits (Schedule of Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
U.S. Pension Benefits [Member]
Total recognized in net periodic benefit cost and other comprehensive loss (income)	$ 346	$ 467	$ 148
Non- U.S Pension Benefits [Member]
Total recognized in net periodic benefit cost and other comprehensive loss (income)	246	792	66
U.S. Postretirement Benefits [Member]
Total recognized in net periodic benefit cost and other comprehensive loss (income)	24	(9)	26
Non- U.S Postretirement Benefits [Member]
Total recognized in net periodic benefit cost and other comprehensive loss (income)	$ 16	$ 12	$ 15

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Debt (Narrative) (Details) (USD $)	1 Months Ended	12 Months Ended				3 Months Ended							3 Months Ended			0 Months Ended		3 Months Ended		12 Months Ended			12 Months Ended
	Feb. 28, 2011 Years	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Feb. 28, 2012	Mar. 31, 2012 Senior Debt Obligations Due 2012 [Member]	Dec. 31, 2012 Senior Debt Obligations Due 2017 [Member]	Mar. 31, 2012 Senior Debt Obligations Due 2017 [Member]	Dec. 31, 2011 Senior Debt Obligations Due 2017 [Member]	Dec. 31, 2012 Senior Debt Obligations Due 2014 [Member]	Jun. 27, 2011 Senior Debt Obligations Due 2014 [Member]	Jun. 27, 2011 Senior Debt Obligations Due 2015 [Member]	Sep. 30, 2011 Senior Debt Obligations Due In Ten Years [Member]	Mar. 31, 2013 Senior Debt Obligations Due 2013 [Member] Subsequent Event [Member]	Sep. 30, 2011 Senior Debt Obligations Due In Ten Years [Member]	Jul. 15, 2011 Senior Debt Obligations Due 2015 [Member]	Jul. 15, 2011 Senior Debt Obligations Due 2014 [Member]	Mar. 31, 2012 Senior Debt Obligations Due 2017 [Member]	Mar. 31, 2012 Senior Debt Obligations Due 2012 [Member]	Dec. 31, 2011 September 2011 Debt Obligation [Member]	Dec. 31, 2012 September 2011 Debt Obligation [Member]	Oct. 13, 2011 September 2011 Debt Obligation [Member]	Dec. 31, 2012 Three-Year Delayed Draw Term Loan Facility [Member]
Debt instrument, interest rate, stated percentage						6.25%		2.30%			5.375%	5.75%	4.80%
Debt Instrument, Term						5 years							10 years							5 years			3 years
Line of Credit Facility, Potential Increase to Maximum Borrowing Capacity																							$ 100,000,000
Senior notes		2,658,000,000	2,668,000,000				249,000,000		0								600,000,000
Revised Purchase Price Allocation For Principal Amount Outstanding of Notes														250,000,000		270,000,000	330,000,000		250,000,000
Number of interest rate swaps	2
Floating rate three-month LIBOR plus fixed spread interest percentage					3.726%
Interest rate swaps, fair value adjustment					0
Swap agreements, effectiveness recognized during the period		0
Interest rate swap for hedging	125,000,000
Interest rate swap maturity, in years	3.5
5.375% senior notes due in 2014, hedged value										250,000,000
Line of credit facility, current borrowing capacity																						1,000,000,000
Revolving credit facility, borrowing capacity																							50,000,000
Revolving credit facility, amount outstanding		0	0																		0		0
Proceeds from issuance of debt		248,000,000	496,000,000												500,000,000			250,000,000
Debtor-in-Possession Financing, Letters of Credit Outstanding		$ 247,000,000	$ 248,000,000

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Goodwill And Other Intangibles (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2012 Risk and Insurance Services [Member]	Dec. 31, 2012 Risk and Insurance Services [Member]	Dec. 31, 2012 Consulting [Member]
Segment Reporting Information [Line Items]
Intangible asset impairment charge				$ 8
Goodwill acquired	226	124			196	30
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount	110
Finite lived assets amortization expense	72	65	66
Finite lived assets amortization expense, excluding discontinued operations			50
Goodwill	$ 6,792	$ 6,562	$ 6,420		$ 4,600	$ 2,200

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Retirement Benefits (Summary of the U.S. and Non-U.S. Plan Investments Measured At Fair Value on a Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Common/collective trusts	$ 5,392	$ 4,847
Corporate obligations	2,237	1,793
Corporate stocks	2,018	1,739
Private equity/Partnerships	828	780
Government securities	318	378
Real estate	376	337
Short-term investment funds	414	330
Company common stock	276	253
Other investments	339	237
Insurance group annuity contracts	23	20
Swaps	4	5
Total investments	12,225	10,719
Transfers between Level 1 and Level 2	0	0
Identical Assets (Level 1) [Member]
Common/collective trusts	16	10
Corporate obligations	0	0
Corporate stocks	2,005	1,716
Private equity/Partnerships	2	0
Government securities	9	10
Real estate	11	14
Short-term investment funds	410	288
Company common stock	276	253
Other investments	11	1
Insurance group annuity contracts	0	0
Swaps	0	0
Total investments	2,740	2,292
Observable Inputs (Level 2) [Member]
Common/collective trusts	5,376	4,837
Corporate obligations	2,236	1,792
Corporate stocks	4	15
Private equity/Partnerships	2	1
Government securities	309	368
Real estate	8	4
Short-term investment funds	4	42
Company common stock	0	0
Other investments	112	34
Insurance group annuity contracts	0	0
Swaps	4	5
Total investments	8,055	7,098
Unobservable Inputs (Level 3) [Member]
Common/collective trusts	0	0
Corporate obligations	1	1
Corporate stocks	9	8
Private equity/Partnerships	824	779
Government securities	0	0
Real estate	357	319
Short-term investment funds	0	0
Company common stock	0	0
Other investments	216	202
Insurance group annuity contracts	23	20
Swaps	0	0
Total investments	$ 1,430	$ 1,329

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Long-Term Commitments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Long-Term Commitments [Abstract]
Lease obligations for office space	98.00%
Net rental costs	$ 416	$ 430	$ 421
Rentals from subleases	$ 10	$ 9	$ 8

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Stock Benefit Plans (Summary Of The Status Of Restricted Stock Unit And Performance Unit Awards) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Non-vested balance at January 1, 2012 (Shares)	51,700
Granted (Shares)	0
Vested (Shares)	(20,000)
Forfeited (Shares)	0
Non-vested balance at December 31, 2012 (Shares)	31,700
Non-vested balance at January 1, 2012 (Weighted Average Grant Date Fair Value)	$ 46.86
Granted (Weighted Average Grant Date Fair Value)	$ 0
Vested (Weighted Average Grant Date Fair Value)	$ 46.14
Forfeited Granted (Weighted Average Grant Date Fair Value)	$ 0
Non-vested balance at December 31, 2012 (Weighted Average Grant Date Fair Value)	$ 47.31
Performance Units [Member]
Non-vested balance at January 1, 2012 (Shares)	368,346
Granted (Shares)	461,756
Vested (Shares)	(25,129)
Forfeited (Shares)	(81,075)
Non-vested balance at December 31, 2012 (Shares)	730,838
Non-vested balance at January 1, 2012 (Weighted Average Grant Date Fair Value)	$ 30.60
Granted (Weighted Average Grant Date Fair Value)	$ 31.89
Vested (Weighted Average Grant Date Fair Value)	$ 30.83
Forfeited Granted (Weighted Average Grant Date Fair Value)	$ 31.31
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Adjustment Performance Units	6,940
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Adjustment Performance Units, Weighted Average Grant Date Fair Value	$ 30.60
Non-vested balance at December 31, 2012 (Weighted Average Grant Date Fair Value)	$ 31.32
Restricted Stock Units (RSUs) [Member]
Non-vested balance at January 1, 2012 (Shares)	15,058,428
Granted (Shares)	2,797,287
Vested (Shares)	(8,209,388)
Forfeited (Shares)	(682,089)
Non-vested balance at December 31, 2012 (Shares)	8,964,238
Non-vested balance at January 1, 2012 (Weighted Average Grant Date Fair Value)	$ 25.43
Granted (Weighted Average Grant Date Fair Value)	$ 31.96
Vested (Weighted Average Grant Date Fair Value)	$ 23.97
Forfeited Granted (Weighted Average Grant Date Fair Value)	$ 28.49
Non-vested balance at December 31, 2012 (Weighted Average Grant Date Fair Value)	$ 28.58

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Long-term Commitments (Operating Lease Agreements) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Long-Term Commitments [Abstract]
2013, Gross Rental Commitments	$ 404
2014, Gross Rental Commitments	359
2015, Gross Rental Commitments	315
2016, Gross Rental Commitments	279
2017, Gross Rental Commitments	236
Subsequent years, Gross Rental Commitments	1,227
2013, Rentals from Subleases	49
2014, Rentals from Subleases	48
2015, Rentals from Subleases	43
2016, Rentals from Subleases	42
2017, Rentals from Subleases	40
Subsequent years, Rentals from Subleases	109
2013, Net Rental Commitments	355
2014, Net Rental Commitments	311
2015, Net Rental Commitments	272
2016, Net Rental Commitments	237
2017, Net Rental Commitments	196
Subsequesnt years, Net Rental Commitments	$ 1,118

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Retirement Benefits (Summary of changes in the fair value of the plans’ Level 3 assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset Value, Beginning	$ 1,329	$ 1,245
Purchases	275	311
Sales	(263)	(251)
Unrealized Gain/(Loss)	254	(46)
Realized Gain/(Loss)	(194)	61
Exchange Rate Impact	29	10
Transfers in/(out) and Other	0	(1)
Fair Value, Asset Value, Ending	1,430	1,329
Private equity/partnerships [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset Value, Beginning	779	746
Purchases	86	119
Sales	(79)	(80)
Unrealized Gain/(Loss)	138	(83)
Realized Gain/(Loss)	(113)	70
Exchange Rate Impact	13	7
Transfers in/(out) and Other	0	0
Fair Value, Asset Value, Ending	824	779
Real estate [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset Value, Beginning	319	293
Purchases	11	0
Sales	(3)	0
Unrealized Gain/(Loss)	104	22
Realized Gain/(Loss)	(86)	(1)
Exchange Rate Impact	12	5
Transfers in/(out) and Other	0	0
Fair Value, Asset Value, Ending	357	319
Other investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset Value, Beginning	202	177
Purchases	17	32
Sales	(24)	(13)
Unrealized Gain/(Loss)	11	6
Realized Gain/(Loss)	6	2
Exchange Rate Impact	4	(2)
Transfers in/(out) and Other	0	0
Fair Value, Asset Value, Ending	216	202
Insurance group annuity contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset Value, Beginning	20	20
Purchases	160	151
Sales	(157)	(150)
Unrealized Gain/(Loss)	1	8
Realized Gain/(Loss)	(1)	(9)
Exchange Rate Impact	0	0
Transfers in/(out) and Other	0	0
Fair Value, Asset Value, Ending	23	20
Corporate stocks [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset Value, Beginning	8	1
Purchases	1	8
Sales	0	0
Unrealized Gain/(Loss)	0	(1)
Realized Gain/(Loss)	0	0
Exchange Rate Impact	0	0
Transfers in/(out) and Other	0	0
Fair Value, Asset Value, Ending	9	8
Corporate Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset Value, Beginning	1	8
Purchases	0	1
Sales	0	(8)
Unrealized Gain/(Loss)	0	2
Realized Gain/(Loss)	0	(1)
Exchange Rate Impact	0	0
Transfers in/(out) and Other	0	(1)
Fair Value, Asset Value, Ending	$ 1	$ 1

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Retirement Benefits (Reconciliation of Prior Service Credit) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of unrecognized prior service credit [Roll Forward]
Recognized as component of net periodic benefit credit	$ (31)	$ (32)	$ (34)
U.S. Pension Benefits [Member]
Reconciliation of unrecognized prior service credit [Roll Forward]
Amount disclosed as of prior year-end	39	55
Recognized as component of net periodic benefit credit	(16)	(16)
Amount at end of year	23	39
Non- U.S Pension Benefits [Member]
Reconciliation of unrecognized prior service credit [Roll Forward]
Amount disclosed as of prior year-end	23	23
Recognized as component of net periodic benefit credit	(3)	3
Defined Benefit Plan, Curtailments	(1)	0
Effect of curtailment	3	1
Plan amendments	71	(3)
Exchange rate adjustments	3	0
Amount at end of year	93	23
U.S. Postretirement Benefits [Member]
Reconciliation of unrecognized prior service credit [Roll Forward]
Amount disclosed as of prior year-end	13	26
Recognized as component of net periodic benefit credit	(13)	(13)
Amount at end of year	0	13
Non- U.S Postretirement Benefits [Member]
Reconciliation of unrecognized prior service credit [Roll Forward]
Amount disclosed as of prior year-end	1	1
Recognized as component of net periodic benefit credit	(1)	0
Defined Benefit Plan, Curtailments	0	0
Effect of curtailment	1	0
Plan amendments	0	0
Exchange rate adjustments	0	0
Amount at end of year	$ 0	$ 1

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Nature of Operations

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

Effective January 1, 2013, the Corporate Benefits and Association businesses, previously part of Marsh's U.S. Consumer operations in the Risk and Insurance Services segment, were transferred to Mercer. Accordingly, these businesses are now part of the Consulting segment. The segment data in Note 6 and Note 16 has been updated to reflect this transfer. See Note 16 for additional details about the impact of these reclassifications.

The Risk and Insurance Services segment provides risk management 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 two main business groups. Mercer provides consulting expertise, advice, services and solutions in the areas of talent, health, retirement and investments. 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 4 to the consolidated financial statements.

On August 3, 2010, the Company completed the sale of Kroll, the Company’s former Risk Consulting & Technology segment, to Altegrity, Inc. (“Altegrity”) for cash consideration of $1.13 billion. In the first quarter of 2010, Kroll completed the sale of Kroll Laboratory Specialists (“KLS”). The gain on the sale of Kroll and related tax benefits and the after-tax loss on the sale of KLS, along with Kroll’s, and KLS’s 2010 results of operations are included in discontinued operations in 2010.

With the sale of Kroll in August 2010, along with other dispositions between 2008 and 2010, the Company has divested its entire Risk Consulting and Technology Segment. The Company has “continuing involvement” in certain Corporate Advisory and Restructuring businesses (“CARG”) that were disposed of in 2008. The runoff of the CARG businesses is being managed by the Company's corporate departments and financial results of these entities are included in “Corporate” for segment reporting purposes.

Principles of Consolidation

Principles of Consolidation:  The accompanying consolidated financial statements include all wholly-owned and majority-owned subsidiaries. All significant inter-company transactions and balances have been eliminated.

Fiduciary Assets And Liabilities

Fiduciary Assets and Liabilities:  In its capacity as an insurance broker or agent, the Company generally 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 $39 million, $47 million and $45 million in 2012, 2011 and 2010, respectively. The Consulting segment recorded fiduciary interest income of $4 million in each of 2012 , 2011 and 2010. 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 $9.1 billion and $9 billion at December 31, 2012 and 2011, respectively. 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. Net uncollected premiums and claims and the related payables are, therefore, 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.

Mercer manages approximately $16 billion of assets in trusts or funds for which Mercer’s management or trustee fee is considered a variable interest. Mercer is not the primary beneficiary of these trusts or funds. Mercer’s only variable interest in any of these trusts or funds is its unpaid fees, if any. Mercer’s maximum exposure to loss of its interests is, therefore, limited to collection of its fees.

Revenue

Revenue:  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 are 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 is provided based on historic and current data on cancellations. 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.

As part of the sale of MMC Capital in 2005, the Company retained the right to receive certain performance fees related to the Trident II and Trident III private equity partnerships. The Company recognizes performance fee income when such fees are no longer subject to forfeiture, which may take a number of years to resolve. The Company has deferred the recognition of income related to such performance fees of $78 million and $74 million at December 31, 2012 and 2011, respectively. This income is based on the investment performance over the life of each private equity fund, and future declines in fund performance from current levels may result in the forfeiture of such revenue. In the first quarter of 2013, Trident II sold substantially all of the remaining assets of the fund and the fund will wind down. As a result, approximately $15 million of the deferred performance fees will be recognized as part of investment income.

Consulting revenue includes fees paid by clients for advice and services and commissions from insurance companies for the placement of individual and group contracts. Fee revenue for engagements where remuneration is based on time plus out-of-pocket expenses is recognized based on the amount of time consulting professionals expend on the engagement. For fixed fee engagements, revenue is recognized using a proportional performance model. Revenue from insurance commissions not subject to a fee arrangement is recorded over the effective period of the applicable policies. Revenues for asset based fees are recognized on an accrual basis by applying the daily/monthly rate as contractually agreed with the client to the applicable net asset value. On a limited number of engagements, performance fees may also be earned for achieving certain pre-determined performance criteria. Such fees are recognized when the performance criteria have been achieved and agreed to by the client. Expenses incurred by professional staff in the generation of revenue are billed to the client and included in revenue.

Cash and Cash Equivalents

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.

Fixed Assets

Fixed Assets:  Fixed assets are stated at cost less accumulated depreciation and amortization. Expenditures for improvements are capitalized. Upon sale or retirement, the cost and related accumulated depreciation and amortization are removed from the accounts and any gain or loss is reflected in income. Expenditures for maintenance and repairs are charged to operations as incurred.

Depreciation of buildings, building improvements, furniture, and equipment is provided on a straight-line basis over the estimated useful lives of these assets. Furniture and equipment is depreciated over periods ranging from three to ten years. Leasehold improvements are amortized on a straight-line basis over the periods covered by the applicable leases or the estimated useful life of the improvement, whichever is less. Buildings are depreciated over periods ranging from thirty to forty years. The Company periodically reviews long-lived assets for impairment whenever events or changes indicate that the carrying value of assets may not be recoverable.

Investment Securities

Investment Securities:  The Company holds investments primarily in private companies and certain private equity funds.

Certain investments, primarily investments in private equity funds, are accounted for under the equity method 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 securities within the fund are carried at fair value. The Company records its proportionate share of the change in fair value of the funds in earnings which amounted to gains of $33 million, $10 million and $32 million in 2012, 2011 and 2010, respectively. Securities recorded using the equity method are included in other assets in the consolidated balance sheets.

The Company has an investment in Trident II limited partnership, a private equity investment fund. At December 31, 2012, the Company’s investment in Trident II was approximately $78 million, reflected in other assets in the consolidated balance sheet. In the first quarter of 2013, Trident II sold substantially all remaining assets and the fund will wind down. The Company expects to receive approximately $100 million in cash proceeds related to this sale in 2013.

Gains or losses recognized in earnings from the investment securities, including the performance fees discussed above, are included in investment income in the consolidated statements of income. Costs related to management of the Company’s investments, including incentive compensation partially derived from investment income and (loss), are recorded in operating expenses.

Goodwill and Intangible Assets

Goodwill and Other Intangible Assets:  Goodwill represents acquisition costs in excess of the fair value of net assets acquired. Goodwill is reviewed at least annually for impairment. The Company performs an annual impairment test for each of its reporting units during the third quarter of each year. When a step 1 test is performed, fair values of the reporting units are estimated using either a market approach or a discounted cash flow model. Carrying values for the reporting units are based on balances at the prior quarter end and include directly identified assets and liabilities as well as an allocation of those assets and liabilities not recorded at the reporting unit level. As discussed in Note 6, the Company assesses qualitative factors to determine if a step 1 assessment is necessary. Other intangible assets, which primarily consist of customer lists, 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 Company had no indefinite lived identified intangible assets at December 31, 2012 or 2011.

Capitalized Software Costs

Capitalized Software Costs:  The Company capitalizes certain costs to develop, purchase or modify software for the internal use of the Company. These costs are amortized on a straight-line basis over periods ranging from three to ten years. Costs incurred during the preliminary project stage and post implementation stage, are expensed as incurred. Costs incurred during the application development stage are capitalized. Costs related to updates and enhancements are only capitalized if they will result in additional functionality. Capitalized computer software costs of $278 million and $244 million, net of accumulated amortization of $691 million and $619 million at December 31, 2012 and 2011, respectively, are included in other assets in the consolidated balance sheets.

Legal and Other Loss Contingencies

Legal and Other Loss Contingencies:  The Company and its subsidiaries are subject to numerous claims, lawsuits and proceedings including claims for errors and omissions ("E&O"). GAAP requires that a liability be recorded when a loss is both probable and reasonably estimable. Significant management judgement is required to apply this guidance. The Company utilizes case level reviews by inside and outside counsel, an internal actuarial analysis and other analyses to estimate potential losses. 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. Given the unpredictability of E&O claims and of litigation that could flow from them, it is possible that an adverse outcome in a particular matter could have a material adverse effect on the Company’s businesses, results of operations, financial condition or cash flow in a given quarterly or annual period.

In addition, to the extent that insurance coverage is available, significant management judgment is required to determine the amount of recoveries that are probable of collection under the Company’s various insurance programs.

The legal and other contingent liabilities described above are not discounted.

Income Taxes

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

The Company reports a liability for unrecognized tax benefits resulting from uncertain tax positions taken or expected to be taken in a tax return. The evaluation of a tax position is a two-step process. The first step involves recognition. The Company determines whether it is more likely than not that a tax position will be sustained upon tax examination, including resolution of any related appeals or litigation, based on only the technical merits of the position. The technical merits of a tax position derive from both statutory and judicial authority (legislation and statutes, legislative intent, regulations, rulings, and case law) and their applicability to the facts and circumstances of the tax position. If a tax position does not meet the more likely than not recognition threshold, the benefit of that position is not recognized in the financial statements. The second step is measurement. A tax position that meets the more likely than not recognition threshold is measured to determine the amount of benefit to recognize in the financial statements. The tax position is measured as the largest amount of benefit that is greater than 50 percent likely of being realized upon ultimate resolution with a taxing authority.

Uncertain tax positions are evaluated based upon the facts and circumstances that exist at each reporting period. Subsequent changes in judgment based upon new information may lead to changes in recognition, derecognition, and measurement. Adjustments may result, for example, upon resolution of an issue with the taxing authorities, or expiration of a statute of limitations barring an assessment for an issue. The Company recognizes interest and penalties, if any, related to unrecognized tax benefits in income tax expense.

Tax law requires items be included in the Company's tax returns at different times than the items are reflected in the financial statements. As a result, the annual tax expense reflected in the consolidated statements of income is different than that reported in the income tax returns. Some of these differences are permanent, such as expenses that are not deductible in the returns, and some differences are temporary and reverse over time, such as depreciation expense. Temporary differences create deferred tax assets and liabilities. Deferred tax assets generally represent items that can be used as a tax deduction or credit in tax returns in future years for which benefit has already been recorded in the financial statements. Valuation allowances are established for deferred tax assets when it is estimated that future taxable income will be insufficient to use a deduction or credit in that jurisdiction. Deferred tax liabilities generally represent tax expense recognized in the financial statements for which payment has been deferred, or expense for which a deduction has been taken already in the tax return but the expense has not yet been recognized in the financial statements.

Derivative Instruments

Derivative Instruments:  All derivatives, whether designated in hedging relationships or not, are recorded on the balance sheet at fair value. If the derivative is designated as a fair value hedge, the changes in the fair value of the derivative and of the hedged item attributable to the hedged risk are recognized in earnings. If the derivative is designated as a cash flow hedge, the effective portions of changes in the fair value of the derivative are recorded in other comprehensive income and are recognized in the income statement when the hedged item affects earnings. Changes in the fair value attributable to the ineffective portion of cash flow hedges are recognized in earnings.

Concentrations Of Credit Risk

Concentrations of Credit Risk:  Financial instruments which potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents, commissions and fees receivable and insurance recoverables. The Company maintains a policy providing for the diversification of cash and cash equivalent investments and places its investments in a large number of high quality financial institutions to limit the amount of credit risk exposure. Concentrations of credit risk with respect to receivables are generally limited due to the large number of clients and markets in which the Company does business, as well as the dispersion across many geographic areas.

Per Share Data

Per Share Data: Under the accounting guidance which applies to the calculation of earnings per share (“EPS”) for share-based payment awards with rights to dividends or dividend equivalents, unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and should be included in the computation of basic and dilutive EPS using the two-class method.

Basic net income per share attributable to the Company and income from continuing operations per share are calculated by dividing the respective after-tax income attributable to common shares by the weighted average number of outstanding shares of the Company’s common stock.

Diluted net income per share attributable to the Company and income from continuing operations per share are calculated by dividing the respective after-tax income attributable to common shares 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 (excluding those that are considered participating securities). The diluted earnings per share calculation reflects the more dilutive effect of either (a) the two-class method that assumes that the participating securities have not been exercised or (b) the treasury stock method. Reconciliation of the applicable income components used for diluted earnings per share and basic weighted average common shares outstanding to diluted weighted average common shares outstanding is presented below.

Estimates

Estimates:  The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results may vary from those estimates.

New Accounting Pronouncements

New Accounting Pronouncements:  In the first quarter of 2012, the Company adopted new accounting guidance related to the presentation of Comprehensive Income. The new guidance gives an entity the option to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In both choices, an entity is required to present each component of net income along with total net income, each component of other comprehensive income along with a total for other comprehensive income, and a total amount for comprehensive income. The guidance eliminates the option to present the components of other comprehensive income as part of the statement of changes in stockholders’ equity. The guidance did not change the items that must be reported in other comprehensive income or when an item of other comprehensive income must be reclassified to net income.

On February 5, 2013, the FASB issued new accounting guidance that adds new disclosure requirements for items reclassified out of accumulated other comprehensive income. The Company is required to implement this new guidance for the reporting period ended March 31, 2013. Other than enhanced disclosure, the adoption of this new guidance is not expected to have a material effect on the Company's financial statements.

In January 2012, the Company adopted guidance issued by the FASB on accounting and disclosure requirements related to fair value measurements. The guidance expands the disclosures on Level 3 inputs by requiring quantitative disclosure of the unobservable inputs and assumptions, as well as description of the valuation processes, the sensitivity of the fair value to changes in unobservable inputs and the hierarchy classification, valuation techniques, and inputs for assets and liabilities whose fair value is only disclosed in the footnotes.

In January 2011, the Company adopted guidance issued by the FASB on revenue recognition regarding multiple-deliverable revenue arrangements. Other than enhanced disclosure, the adoption of this new guidance did not have a material effect on the Company's financial statements.

In January 2011, the Company adopted guidance issued by the FASB which establishes a revenue recognition model for contingent consideration that is payable upon the achievement of an uncertain future event, referred to as a milestone. The scope of this guidance is limited to research or development arrangements and requires an entity to record the milestone payment in its entirety in the period received if the milestone meets all the necessary criteria to be considered substantive. However, entities would not be precluded from making an accounting policy election to apply another appropriate accounting policy that results in the deferral of some portion of the arrangement consideration. The adoption of this new guidance did not have a material impact on the Company’s financial statements.

Reclassification

Reclassifications: Certain reclassifications have been made to prior period amounts to conform with current year presentation, in particular with regard to combining income taxes receivable with other receivables on the consolidated balance sheets.

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Other Comprehensive Income (Loss) (Schedule Of Components Of Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Foreign currency translation adjustments, Pre-Tax	$ 177	$ (100)	$ (34)
Foreign currency translation adjustments, Tax Expense	(5)	4	(7)
Foreign currency translation adjustments, Net of Tax	182	(104)	(27)
Unrealized investment loss, Pre-Tax	(1)	(9)	(17)
Unrealized investment holding losses, net of income tax (credit) expense	1	(4)	(5)
Unrealized investment holding gains (losses),Net of Tax	(2)	(5)	(12)
Pension/post-retirement plans:
Prior service gains. Pre-Tax	(31)	(32)	(34)
Prior Service cost, Tax Expense	(12)	(13)	(13)
Prior Service cost, Net of Tax	(19)	(19)	(21)
Net actuarial losses, Pre-Tax	270	213	144
Net actuarial losses, Tax Expense	90	68	48
Net actuarial losses, Net of Tax	180	145	96
Subtotal, Pre-Tax	239	181	110
Subtotal, Tax Expense	78	55	35
Subtotal, Net of Tax	161	126	75
Net gain (loss) arising during period, Pre-Tax	(648)	(1,289)	(346)
Net gain (loss) arising during period, Tax Expense	(217)	(388)	(111)
Net gain (loss) arising during period, Net of Tax	(431)	(901)	(235)
Foreign currency translation adjustments, Pre-Tax	(113)	(14)	89
Foreign currency translation adjustments, Tax Expense	(26)	(3)	18
Foreign currency translation adjustments, Net of Tax	(87)	(11)	71
Other adjustments. Pre-Tax	75	8	1
Other adjustments, Tax Expense	17	1	2
Other adjustmentsI, Net of Tax	58	7	(1)
Pension/post-retirement plans (gains) losses, Pre-Tax	(447)	(1,114)	(146)
Pension/post-retirement plans (gains) losses, Tax Expense	(148)	(335)	(56)
Pension/post-retirement plans (gains) losses, Net of Tax	(299)	(779)	(90)
Other Comprehensive Income (Loss), Pre-Tax	(271)	(1,223)	(197)
Other Comprehensive Income (Loss), Tax	(152)	(335)	(68)
Other comprehensive loss, net of tax	$ (119)	$ (888)	$ (129)

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Summary of Significant Accounting Policies (Basic EPS Calculation for Continuing Operations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income from continuing operations	$ 1,204	$ 982	$ 565
Less: Net income attributable to non-controlling interests	25	22	16
Net income attributable to the Company	1,176	993	855
Basic weighted average common shares outstanding	544	542	540
Segment, Continuing Operations [Member]
Net income from continuing operations	1,204	982	565
Less: Net income attributable to non-controlling interests	25	22	16
Net income attributable to the Company	1,179	960	549
Less: Portion attributable to participating securities	2	6	6
Net income attributable to common shares for basic earnings per shares	$ 1,177	$ 954	$ 543
Basic weighted average common shares outstanding	544	542	540

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Retirement Benefits (Schedule of Estimated Future Benefit Payments for Pension and Postretirement Benefits) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
U.S. Pension Benefits [Member]
2013	$ 210
2014	221
2015	231
2016	242
2017	251
2018-2022	1,394
Non- U.S Pension Benefits [Member]
2013	275
2014	276
2015	287
2016	310
2017	321
2018-2022	1,910
U.S. Postretirement Benefits [Member]
2013	11
2014	11
2015	11
2016	11
2017	11
2018-2022	59
Non- U.S Postretirement Benefits [Member]
2013	4
2014	4
2015	4
2016	4
2017	5
2018-2022	$ 27

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Claims, Lawsuits And Other Contingencies Claims, Lawsuits And Other Contingencies (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Reinsured Policies Covered By Related Party Guarantee	$ 40

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Debt (Tables)

12 Months Ended

Dec. 31, 2012

Debt [Abstract]

Schedule of Outstanding Debt

The Company’s outstanding debt is as follows:

December 31,
(In millions of dollars)	2012		2011
Short-term:
Current portion of long-term debt	$	260	$	260
Long-term:
Senior notes – 6.25% due 2012 (5.1% effective interest rate)	$	—	$	250
Senior notes – 4.850% due 2013	250		251
Senior notes – 5.875% due 2033	296		296
Senior notes – 5.375% due 2014	326		326
Senior notes – 5.75% due 2015	479		479
Senior notes – 2.30% due 2017	249		—
Senior notes – 9.25% due 2019	398		398
Senior notes – 4.80% due 2021	497		496
Mortgage – 5.70% due 2035	422		431
Other	1		1
	2,918		2,928
Less current portion	260		260
	$	2,658	$	2,668

Gain Or Loss On The Hedged Item And Offsetting Gain Or Loss On Interest Rate Swaps

The gain or loss on the hedged item (fixed rate debt) and the offsetting gain or (loss) on the interest rate swaps for the periods ended December 31, 2012 and December 31, 2011 is as follows:

	2012							2011
Income statement classification (In millions of dollars)	Loss on Swaps			Gain on Notes		Net Income Effect		Gain on Swaps		Loss on Notes			Net Income Effect
Other Operating Expenses	$	(1	)	$	1	$	—	$	7	$	(7	)	$	—

Estimated Fair Value Of Significant Financial Instruments

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.

	December 31, 2012				December 31, 2011
(In millions of dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Short-term debt	$	260	$	261	$	260	$	261
Long-term debt	$	2,658	$	2,986	$	2,668	$	2,958

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Acquisitions (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended					12 Months Ended				12 Months Ended		12 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2011	Feb. 29, 2012 Acquisition Yokogawa-ORC [Member]	Dec. 31, 2012 Current Year Acquisitions [Member]	Dec. 31, 2012 Released Cash Held in Escrow [Member]	Dec. 31, 2011 Released Cash Held in Escrow [Member]	Dec. 31, 2010 Released Cash Held in Escrow [Member]	Dec. 31, 2011 Minority Interest Acquired [Member]	Jun. 30, 2011 Minority Interest Acquired [Member]	Dec. 31, 2012 Purchase Consideration for Acquisitions During the Period [Member]	Dec. 31, 2011 Prior Years Acquisitions [Member]	Dec. 31, 2011 Remaining Prior Years Acquisitions [Member]	Dec. 31, 2012 Risk and Insurance Services [Member]	Dec. 31, 2011 Risk and Insurance Services [Member]	Dec. 31, 2012 Consulting [Member]	Dec. 31, 2011 Consulting [Member]	Dec. 31, 2012 Maximum [Member] Current Year Acquisitions [Member]	Dec. 31, 2011 Maximum [Member] Prior Years Acquisitions [Member]	Dec. 31, 2012 Minimum [Member] Current Year Acquisitions [Member]	Dec. 31, 2011 Minimum [Member] Prior Years Acquisitions [Member]
Finite-Lived Intangible Asset, Useful Life	10 years
Cash						$ 252	$ 62	$ 0	$ 0				$ 164
Estimated fair value of deferred/contingent consideration	46	33	81			46							33
Total Consideration	360					360					8		197
Adjustments to Additional Paid in Capital, Other										2
Deferred purchase consideration				13		59								27
Purchase of other intangible assets	3	4	3			3
Number of acquisitions made															12	7	3	5
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage					49.00%
Revenue target period, in years																			4 years	4 years	2 years	2 years
Revenue related to acquisitions	12,013	11,778	10,839			113
Net operating income related to acquisitions	1,214	990	580			21
Contingent payments for acquisitions	$ 30	$ 16										$ 30

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Retirement Benefits (Weighted Average Actuarial Assumptions Utilized) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Pension Plans, Defined Benefit [Member]
Discount rate (for expense)	4.91%	5.59%
Expected return on plan assets	8.03%	8.19%
Rate of compensation increase (for expense)	3.09%	4.08%
Discount rate (for benefit obligation)	4.38%	4.91%
Rate of compensation increase (for benefit obligation)	2.43%	3.09%
U.S. Pension Benefits [Member]
Discount rate (for expense)	5.15%	5.90%
Expected return on plan assets	8.75%	8.75%
Rate of compensation increase (for expense)	2.00%	3.90%
Discount rate (for benefit obligation)	4.45%	5.15%
Rate of compensation increase (for benefit obligation)	2.00%	2.00%
Non- U.S Pension Benefits [Member]
Discount rate (for expense)	4.77%	5.41%
Expected return on plan assets	7.68%	7.91%
Rate of compensation increase (for expense)	3.73%	4.19%
Discount rate (for benefit obligation)	4.33%	4.77%
Rate of compensation increase (for benefit obligation)	2.69%	3.73%
Postretirement Benefits [Member]
Discount rate (for expense)	5.05%	5.81%
Expected return on plan assets	0.00%	0.00%
Rate of compensation increase (for expense)	0.00%	0.00%
Discount rate (for benefit obligation)	4.32%	5.05%
Rate of compensation increase (for benefit obligation)	0.00%	0.00%
U.S. Postretirement Benefits [Member]
Discount rate (for expense)	5.10%	5.95%
Expected return on plan assets	0.00%	0.00%
Rate of compensation increase (for expense)	0.00%	0.00%
Discount rate (for benefit obligation)	4.25%	5.10%
Rate of compensation increase (for benefit obligation)	0.00%	0.00%
Non- U.S Postretirement Benefits [Member]
Discount rate (for expense)	4.95%	5.51%
Expected return on plan assets	0.00%	0.00%
Rate of compensation increase (for expense)	0.00%	0.00%
Discount rate (for benefit obligation)	4.45%	4.95%
Rate of compensation increase (for benefit obligation)	0.00%	0.00%

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Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Investments in foreign subsidiaries	$ 4,300,000,000
Effective tax rate	29.00%	30.10%	26.50%
Valuation allowances	23,000,000	1,000,000
Valuation allowances, beginning balance	16,000,000	7,000,000
Net Operating Loss Carryforwards	73.00%
Domestic deferred tax assets	270,000,000
Unrecognized tax benefits that would impact effective tax rate	96,000,000	102,000,000	123,000,000
Accrued interest and penalties	13,000,000	17,000,000	35,000,000
Putnam and issues included in consolidated mmc tax returns	117,000,000	143,000,000	199,000,000	206,000,000
Unrecognized tax benefits minimum	0
Unrecognized tax benefits maximum	25,000,000
Putnam and Kroll [Member]
Putnam and issues included in consolidated mmc tax returns	6,000,000	14,000,000	75,000,000
State and Local Jurisdiction [Member]
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward	78,000,000
Non US [Member]
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward	$ 90,000,000

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Supplemental Disclosures (Schedule of Supplemental Cash Flow Disclosures) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Disclosures [Line Items]
Assets acquired, excluding cash	$ 380	$ 214	$ 867
Liabilities assumed	(42)	(21)	(176)
Shares issued (7.6 million shares in 2010)	0	0	(183)
Contingent/deferred purchase consideration	(46)	(33)	(81)
Net cash outflow for current year acquisitions	230	160	427
Purchase of other intangible assets	3	4	3
Deferred purchase consideration from prior years' acquisitions	59	11	62
Subtotal	292	175	492
Cash paid into escrow for future acquisition	0	62	0
Net cash outflow for acquisitions	292	237	492
Interest paid	183	188	232
Income taxes paid, net of refunds	350	37	39
Shares issued			7.6
Released Cash Held in Escrow [Member]
Supplemental Disclosures [Line Items]
Released from escrow in 2012	$ (62)	$ 0	$ 0

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

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

Effective January 1, 2013, the Corporate Benefits and Association businesses, previously part of Marsh's U.S. Consumer operations in the Risk and Insurance Services segment, were transferred to Mercer. Accordingly, these businesses are now part of the Consulting segment. The segment data in Note 6 and Note 16 has been updated to reflect this transfer. See Note 16 for additional details about the impact of these reclassifications.

The Risk and Insurance Services segment provides risk management 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 two main business groups. Mercer provides consulting expertise, advice, services and solutions in the areas of talent, health, retirement and investments. 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 4 to the consolidated financial statements.

On August 3, 2010, the Company completed the sale of Kroll, the Company’s former Risk Consulting & Technology segment, to Altegrity, Inc. (“Altegrity”) for cash consideration of $1.13 billion. In the first quarter of 2010, Kroll completed the sale of Kroll Laboratory Specialists (“KLS”). The gain on the sale of Kroll and related tax benefits and the after-tax loss on the sale of KLS, along with Kroll’s, and KLS’s 2010 results of operations are included in discontinued operations in 2010.

With the sale of Kroll in August 2010, along with other dispositions between 2008 and 2010, the Company has divested its entire Risk Consulting and Technology Segment. The Company has “continuing involvement” in certain Corporate Advisory and Restructuring businesses (“CARG”) that were disposed of in 2008. The runoff of the CARG businesses is being managed by the Company's corporate departments and financial results of these entities are included in “Corporate” for segment reporting purposes.

Principles of Consolidation:  The accompanying consolidated financial statements include all wholly-owned and majority-owned subsidiaries. All significant inter-company transactions and balances have been eliminated.

Fiduciary Assets and Liabilities:  In its capacity as an insurance broker or agent, the Company generally 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 $39 million, $47 million and $45 million in 2012, 2011 and 2010, respectively. The Consulting segment recorded fiduciary interest income of $4 million in each of 2012 , 2011 and 2010. 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 $9.1 billion and $9 billion at December 31, 2012 and 2011, respectively. 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. Net uncollected premiums and claims and the related payables are, therefore, 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.

Mercer manages approximately $16 billion of assets in trusts or funds for which Mercer’s management or trustee fee is considered a variable interest. Mercer is not the primary beneficiary of these trusts or funds. Mercer’s only variable interest in any of these trusts or funds is its unpaid fees, if any. Mercer’s maximum exposure to loss of its interests is, therefore, limited to collection of its fees.

Revenue:  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 are 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 is provided based on historic and current data on cancellations. 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.

As part of the sale of MMC Capital in 2005, the Company retained the right to receive certain performance fees related to the Trident II and Trident III private equity partnerships. The Company recognizes performance fee income when such fees are no longer subject to forfeiture, which may take a number of years to resolve. The Company has deferred the recognition of income related to such performance fees of $78 million and $74 million at December 31, 2012 and 2011, respectively. This income is based on the investment performance over the life of each private equity fund, and future declines in fund performance from current levels may result in the forfeiture of such revenue. In the first quarter of 2013, Trident II sold substantially all of the remaining assets of the fund and the fund will wind down. As a result, approximately $15 million of the deferred performance fees will be recognized as part of investment income.

Consulting revenue includes fees paid by clients for advice and services and commissions from insurance companies for the placement of individual and group contracts. Fee revenue for engagements where remuneration is based on time plus out-of-pocket expenses is recognized based on the amount of time consulting professionals expend on the engagement. For fixed fee engagements, revenue is recognized using a proportional performance model. Revenue from insurance commissions not subject to a fee arrangement is recorded over the effective period of the applicable policies. Revenues for asset based fees are recognized on an accrual basis by applying the daily/monthly rate as contractually agreed with the client to the applicable net asset value. On a limited number of engagements, performance fees may also be earned for achieving certain pre-determined performance criteria. Such fees are recognized when the performance criteria have been achieved and agreed to by the client. Expenses incurred by professional staff in the generation of revenue are billed to the client and included in revenue.

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 $250 million related to regulatory requirements outside the U.S. or as collateral under captive insurance arrangements.

Fixed Assets:  Fixed assets are stated at cost less accumulated depreciation and amortization. Expenditures for improvements are capitalized. Upon sale or retirement, the cost and related accumulated depreciation and amortization are removed from the accounts and any gain or loss is reflected in income. Expenditures for maintenance and repairs are charged to operations as incurred.

Depreciation of buildings, building improvements, furniture, and equipment is provided on a straight-line basis over the estimated useful lives of these assets. Furniture and equipment is depreciated over periods ranging from three to ten years. Leasehold improvements are amortized on a straight-line basis over the periods covered by the applicable leases or the estimated useful life of the improvement, whichever is less. Buildings are depreciated over periods ranging from thirty to forty years. The Company periodically reviews long-lived assets for impairment whenever events or changes indicate that the carrying value of assets may not be recoverable.

The components of fixed assets are as follows:

December 31,
(In millions of dollars)	2012			2011
Furniture and equipment	$	1,168		$	1,101
Land and buildings	412			405
Leasehold and building improvements	811			767
	2,391			2,273
Less-accumulated depreciation and amortization	(1,582		)	(1,469		)
	$	809		$	804

Investment Securities:  The Company holds investments primarily in private companies and certain private equity funds.

Certain investments, primarily investments in private equity funds, are accounted for under the equity method 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 securities within the fund are carried at fair value. The Company records its proportionate share of the change in fair value of the funds in earnings which amounted to gains of $33 million, $10 million and $32 million in 2012, 2011 and 2010, respectively. Securities recorded using the equity method are included in other assets in the consolidated balance sheets.

The Company has an investment in Trident II limited partnership, a private equity investment fund. At December 31, 2012, the Company’s investment in Trident II was approximately $78 million, reflected in other assets in the consolidated balance sheet. In the first quarter of 2013, Trident II sold substantially all remaining assets and the fund will wind down. The Company expects to receive approximately $100 million in cash proceeds related to this sale in 2013.

Gains or losses recognized in earnings from the investment securities, including the performance fees discussed above, are included in investment income in the consolidated statements of income. Costs related to management of the Company’s investments, including incentive compensation partially derived from investment income and (loss), are recorded in operating expenses.

Goodwill and Other Intangible Assets:  Goodwill represents acquisition costs in excess of the fair value of net assets acquired. Goodwill is reviewed at least annually for impairment. The Company performs an annual impairment test for each of its reporting units during the third quarter of each year. When a step 1 test is performed, fair values of the reporting units are estimated using either a market approach or a discounted cash flow model. Carrying values for the reporting units are based on balances at the prior quarter end and include directly identified assets and liabilities as well as an allocation of those assets and liabilities not recorded at the reporting unit level. As discussed in Note 6, the Company assesses qualitative factors to determine if a step 1 assessment is necessary. Other intangible assets, which primarily consist of customer lists, 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 Company had no indefinite lived identified intangible assets at December 31, 2012 or 2011.

Capitalized Software Costs:  The Company capitalizes certain costs to develop, purchase or modify software for the internal use of the Company. These costs are amortized on a straight-line basis over periods ranging from three to ten years. Costs incurred during the preliminary project stage and post implementation stage, are expensed as incurred. Costs incurred during the application development stage are capitalized. Costs related to updates and enhancements are only capitalized if they will result in additional functionality. Capitalized computer software costs of $278 million and $244 million, net of accumulated amortization of $691 million and $619 million at December 31, 2012 and 2011, respectively, are included in other assets in the consolidated balance sheets.

Legal and Other Loss Contingencies:  The Company and its subsidiaries are subject to numerous claims, lawsuits and proceedings including claims for errors and omissions ("E&O"). GAAP requires that a liability be recorded when a loss is both probable and reasonably estimable. Significant management judgement is required to apply this guidance. The Company utilizes case level reviews by inside and outside counsel, an internal actuarial analysis and other analyses to estimate potential losses. 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. Given the unpredictability of E&O claims and of litigation that could flow from them, it is possible that an adverse outcome in a particular matter could have a material adverse effect on the Company’s businesses, results of operations, financial condition or cash flow in a given quarterly or annual period.

In addition, to the extent that insurance coverage is available, significant management judgment is required to determine the amount of recoveries that are probable of collection under the Company’s various insurance programs.

The legal and other contingent liabilities described above are not discounted.

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

The Company reports a liability for unrecognized tax benefits resulting from uncertain tax positions taken or expected to be taken in a tax return. The evaluation of a tax position is a two-step process. The first step involves recognition. The Company determines whether it is more likely than not that a tax position will be sustained upon tax examination, including resolution of any related appeals or litigation, based on only the technical merits of the position. The technical merits of a tax position derive from both statutory and judicial authority (legislation and statutes, legislative intent, regulations, rulings, and case law) and their applicability to the facts and circumstances of the tax position. If a tax position does not meet the more likely than not recognition threshold, the benefit of that position is not recognized in the financial statements. The second step is measurement. A tax position that meets the more likely than not recognition threshold is measured to determine the amount of benefit to recognize in the financial statements. The tax position is measured as the largest amount of benefit that is greater than 50 percent likely of being realized upon ultimate resolution with a taxing authority.

Uncertain tax positions are evaluated based upon the facts and circumstances that exist at each reporting period. Subsequent changes in judgment based upon new information may lead to changes in recognition, derecognition, and measurement. Adjustments may result, for example, upon resolution of an issue with the taxing authorities, or expiration of a statute of limitations barring an assessment for an issue. The Company recognizes interest and penalties, if any, related to unrecognized tax benefits in income tax expense.

Tax law requires items be included in the Company's tax returns at different times than the items are reflected in the financial statements. As a result, the annual tax expense reflected in the consolidated statements of income is different than that reported in the income tax returns. Some of these differences are permanent, such as expenses that are not deductible in the returns, and some differences are temporary and reverse over time, such as depreciation expense. Temporary differences create deferred tax assets and liabilities. Deferred tax assets generally represent items that can be used as a tax deduction or credit in tax returns in future years for which benefit has already been recorded in the financial statements. Valuation allowances are established for deferred tax assets when it is estimated that future taxable income will be insufficient to use a deduction or credit in that jurisdiction. Deferred tax liabilities generally represent tax expense recognized in the financial statements for which payment has been deferred, or expense for which a deduction has been taken already in the tax return but the expense has not yet been recognized in the financial statements.

Derivative Instruments:  All derivatives, whether designated in hedging relationships or not, are recorded on the balance sheet at fair value. If the derivative is designated as a fair value hedge, the changes in the fair value of the derivative and of the hedged item attributable to the hedged risk are recognized in earnings. If the derivative is designated as a cash flow hedge, the effective portions of changes in the fair value of the derivative are recorded in other comprehensive income and are recognized in the income statement when the hedged item affects earnings. Changes in the fair value attributable to the ineffective portion of cash flow hedges are recognized in earnings.

Concentrations of Credit Risk:  Financial instruments which potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents, commissions and fees receivable and insurance recoverables. The Company maintains a policy providing for the diversification of cash and cash equivalent investments and places its investments in a large number of high quality financial institutions to limit the amount of credit risk exposure. Concentrations of credit risk with respect to receivables are generally limited due to the large number of clients and markets in which the Company does business, as well as the dispersion across many geographic areas.

Per Share Data: Under the accounting guidance which applies to the calculation of earnings per share (“EPS”) for share-based payment awards with rights to dividends or dividend equivalents, unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and should be included in the computation of basic and dilutive EPS using the two-class method.

Basic net income per share attributable to the Company and income from continuing operations per share are calculated by dividing the respective after-tax income attributable to common shares by the weighted average number of outstanding shares of the Company’s common stock.

Diluted net income per share attributable to the Company and income from continuing operations per share are calculated by dividing the respective after-tax income attributable to common shares 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 (excluding those that are considered participating securities). The diluted earnings per share calculation reflects the more dilutive effect of either (a) the two-class method that assumes that the participating securities have not been exercised or (b) the treasury stock method. Reconciliation of the applicable income components used for diluted earnings per share and basic weighted average common shares outstanding to diluted weighted average common shares outstanding is presented below.

Basic EPS Calculation - Continuing Operations
(In millions, except per share figures)	2012		2011		2010
Net income from continuing operations	$	1,204	$	982	$	565
Less: Net income attributable to non-controlling interests	25		22		16
Net income from continuing operations attributable to the Company	1,179		960		549
Less: Portion attributable to participating securities	2		6		6
Net income attributable to common shares for basic earnings per share	$	1,177	$	954	$	543
Basic weighted average common shares outstanding	544		542		540

Basic EPS Calculation - Net Income
(In millions, except per share figures)	2012		2011		2010
Net income attributable to the Company	$	1,176	$	993	$	855
Less: Portion attributable to participating securities	2		6		11
Net income attributable to common shares for basic earnings per share	$	1,174	$	987	$	844
Basic weighted average common shares outstanding	544		542		540

Diluted EPS Calculation - Continuing Operations
(In millions, except per share figures)	2012		2011		2010
Net income from continuing operations	$	1,204	$	982	$	565
Less: Net income attributable to non-controlling interests	25		22		16
Net income from continuing operations attributable to the Company	1,179		960		549
Less: Portion attributable to participating securities	2		6		6
Net income attributable to common shares for diluted earnings per share	$	1,177	$	954	$	543
Basic weighted average common shares outstanding	544		542		540
Dilutive effect of potentially issuable common shares	8		9		4
Diluted weighted average common shares outstanding	552		551		544
Average stock price used to calculate common stock equivalents	$	33.10	$	29.40	$	23.76

Diluted EPS Calculation - Net Income
(In millions, except per share figures)	2012		2011		2010
Net income attributable to the Company	$	1,176	$	993	$	855
Less: Portion attributable to participating securities	2		6		11
Net income attributable to common shares for diluted earnings per share	$	1,174	$	987	$	844
Basic weighted average common shares outstanding	544		542		540
Dilutive effect of potentially issuable common shares	8		9		4
Diluted weighted average common shares outstanding	552		551		544
Average stock price used to calculate common stock equivalents	$	33.10	$	29.40	$	23.76

There were 32.0 million, 38.9 million and 43.4 million stock options outstanding as of December 31, 2012, 2011 and 2010, respectively.

Other Significant Matters Impacting Results in Prior Periods: In June 2010, the Company settled a lawsuit brought by the Alaska Retirement Management Board (“ARMB”) against Mercer. Under the terms of the settlement agreement, Mercer paid $500 million, of which $100 million was covered by insurance, and recognized a charge of $400 million in the second quarter of 2010.

Estimates:  The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results may vary from those estimates.

New Accounting Pronouncements:  In the first quarter of 2012, the Company adopted new accounting guidance related to the presentation of Comprehensive Income. The new guidance gives an entity the option to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In both choices, an entity is required to present each component of net income along with total net income, each component of other comprehensive income along with a total for other comprehensive income, and a total amount for comprehensive income. The guidance eliminates the option to present the components of other comprehensive income as part of the statement of changes in stockholders’ equity. The guidance did not change the items that must be reported in other comprehensive income or when an item of other comprehensive income must be reclassified to net income.

On February 5, 2013, the FASB issued new accounting guidance that adds new disclosure requirements for items reclassified out of accumulated other comprehensive income. The Company is required to implement this new guidance for the reporting period ended March 31, 2013. Other than enhanced disclosure, the adoption of this new guidance is not expected to have a material effect on the Company's financial statements.

In January 2012, the Company adopted guidance issued by the FASB on accounting and disclosure requirements related to fair value measurements. The guidance expands the disclosures on Level 3 inputs by requiring quantitative disclosure of the unobservable inputs and assumptions, as well as description of the valuation processes, the sensitivity of the fair value to changes in unobservable inputs and the hierarchy classification, valuation techniques, and inputs for assets and liabilities whose fair value is only disclosed in the footnotes.

In January 2011, the Company adopted guidance issued by the FASB on revenue recognition regarding multiple-deliverable revenue arrangements. Other than enhanced disclosure, the adoption of this new guidance did not have a material effect on the Company's financial statements.

In January 2011, the Company adopted guidance issued by the FASB which establishes a revenue recognition model for contingent consideration that is payable upon the achievement of an uncertain future event, referred to as a milestone. The scope of this guidance is limited to research or development arrangements and requires an entity to record the milestone payment in its entirety in the period received if the milestone meets all the necessary criteria to be considered substantive. However, entities would not be precluded from making an accounting policy election to apply another appropriate accounting policy that results in the deferral of some portion of the arrangement consideration. The adoption of this new guidance did not have a material impact on the Company’s financial statements.

Reclassifications: Certain reclassifications have been made to prior period amounts to conform with current year presentation, in particular with regard to combining income taxes receivable with other receivables on the consolidated balance sheets.

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Income Taxes (Taxes on Income) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
U.S., income before income taxes	$ 398	$ 121	$ (296)
Other, income before income taxes	1,298	1,283	1,065
Total income before imcome taxes	1,696	1,404	769
U.S. Federal, current	42	7	(90)
Other national governments, current	336	289	249
U.S. state and local, current	24	24	21
Total current income taxes	402	320	180
U.S. Federal, deferred	(18)	5	(28)
Other national governments, deferred	89	90	50
U.S. state and local, deferred	19	7	2
Total deferred income taxes	90	102	24
Total income taxes	$ 492	$ 422	$ 204

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Summary of Significant Accounting Policies (Basic EPS Calculation for Net Income) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income attributable to the Company	$ 1,176	$ 993	$ 855
Basic weighted average common shares outstanding	544	542	540
Net Income [Member]
Net income attributable to the Company	1,176	993	855
Less: Portion attributable to participating securities	2	6	11
Net income attributable to common shares for basic earnings per shares	$ 1,174	$ 987	$ 844
Basic weighted average common shares outstanding	544	542	540

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Acquisitions (Tables)

12 Months Ended

Dec. 31, 2012

Acquisitions [Abstract]

Allocation Of Acquisition Costs

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

(In millions)	2012
Cash (includes $62 million held in escrow at December 31, 2011)	$	314
Estimated fair value of deferred/contingent consideration	46
Total Consideration	$	360
Allocation of purchase price:
Cash and cash equivalents	$	22
Accounts receivable, net	8
Other current assets	—
Property, plant, and equipment	5
Intangible assets (primarily customer lists amortized over 10 years)	147
Goodwill	226
Other assets	5
Total assets acquired	413
Current liabilities	13
Other liabilities	40
Total liabilities assumed	53
Net assets acquired	$	360

Pro-Forma Information

	Years Ended December 31,
(In millions, except per share data)	2012		2011		2010
Revenue	$	12,013	$	11,778	$	10,839
Income from continuing operations	$	1,214	$	990	$	580
Net income attributable to the Company	$	1,187	$	1,001	$	870
Basic net income per share:
– Continuing operations	$	2.18	$	1.78	$	1.03
– Net income attributable to the Company	$	2.18	$	1.84	$	1.59
Diluted net income per share:
– Continuing operations	$	2.15	$	1.75	$	1.02
– Net income attributable to the Company	$	2.14	$	1.81	$	1.57

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Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2012

Other Comprehensive Income (Loss) [Abstract]

Schedule of Other Comprehensive Income (Loss)

The components of other comprehensive income (loss) for the years ended December 31, 2012, 2011 and 2010 are as follows:

For the year ended December 31,	2012
(In millions of dollars)	Pre-Tax			Tax (Credit)			Net of Tax
Foreign currency translation adjustments	$	177		$	(5	)	$	182
Unrealized investment gains (losses)	(1		)	1			(2		)
Pension/post-retirement plans:
Amortization of losses (gains) included in net periodic pension cost:
Prior service gains	(31		)	(12		)	(19		)
Net actuarial losses	270			90			180
Subtotal	239			78			161
Net loss arising during period	(648		)	(217		)	(431		)
Foreign currency translation adjustments	(113		)	(26		)	(87		)
Other adjustments	75			17			58
Pension/post-retirement plans losses	(447		)	(148		)	(299		)
Other comprehensive loss	$	(271	)	$	(152	)	$	(119	)

For the year ended December 31,	2011
(In millions of dollars)	Pre-Tax			Tax (Credit)			Net of Tax
Foreign currency translation adjustments	$	(100	)	$	4		$	(104	)
Unrealized investment losses	(9		)	(4		)	(5		)
Pension/post-retirement plans:
Amortization of losses (gains) included in net periodic pension cost:
Prior service gains	(32		)	(13		)	(19		)
Net actuarial losses	213			68			145
Subtotal	181			55			126
Net loss arising during period	(1,289		)	(388		)	(901		)
Foreign currency translation adjustments	(14		)	(3		)	(11		)
Other adjustments	8			1			7
Pension/post-retirement plans losses	(1,114		)	(335		)	(779		)
Other comprehensive loss	$	(1,223	)	$	(335	)	$	(888	)

For the year ended December 31,	2010
(In millions of dollars)	Pre-Tax			Tax (Credit)			Net of Tax
Foreign currency translation adjustments	$	(34	)	$	(7	)	$	(27	)
Unrealized investment losses	(17		)	(5		)	(12		)
Pension/post-retirement plans:
Amortization of losses (gains) included in net periodic pension cost:
Prior service gains	(34		)	(13		)	(21		)
Net actuarial losses	144			48			96
Subtotal	110			35			75
Net loss arising during period	(346		)	(111		)	(235		)
Foreign currency translation adjustments	89			18			71
Other adjustments	1			2			(1		)
Pension/post-retirement plans losses	(146		)	(56		)	(90		)
Other comprehensive loss	$	(197	)	$	(68	)	$	(129	)

Schedule of Accumulated Other Comprehensive Income (Loss)

The components of accumulated other comprehensive income (loss) are as follows:

(In millions of dollars)	December 31, 2012			December 31, 2011
Foreign currency translation adjustments (net of deferred tax liability of $9 and $14 in 2012 and 2011, respectively)	$	140		$	(42	)
Net unrealized investment gains (net of deferred tax liability of $2 and $1 in 2012 and 2011, respectively)	4			6
Net charges related to pension / post-retirement plans (net of deferred tax asset of $1,657 and $1,508 in 2012 and 2011, respectively)	(3,451		)	(3,152		)
	$	(3,307	)	$	(3,188	)

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Discontinued Operations (Income Statement Data) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Discontinued Operations and Disposal Groups [Abstract]
Revenue	$ 0		$ 0		$ 381
Operating expenses	0		0		345
Operating income	0		0		36
Income tax expense	0		0		16
Income from Kroll operations, net of tax	0		0		20
Other discontinued operations, net of tax			(17)		(7)
Income (loss) from discontinued operations, net of tax			(17)		13
Disposals of discontinued operations	(2)	[1]	25	[1]	58	[1]
Income tax (credit) expense	1	[2]	(25)	[2]	(235)	[2]
Disposals of discontinued operations, net of tax	(3)		50		293
Discontinued operations, net of tax	$ (3)		$ 33		$ 306
Discontinued operations, net of tax per basic share	$ 0.00		$ 0.06		$ 0.55
Discontinued operations, net of tax per diluted share	$ 0.00		$ 0.06		$ 0.55

[1] Includes gain on sale of Kroll and the gain on the sale of KLS in 2010.

[2] Includes the provision/(credit) for income taxes relating to the recognition of tax benefits recorded in connection with the sale of Kroll as well as a tax provision of $36 million on the sale of KLS in 2010.

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Summary of Significant Accounting Policies (Diluted EPS Calculation for Continuing Operations) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income from continuing operations	$ 1,204	$ 982	$ 565
Less: Net income attributable to non-controlling interests	25	22	16
Net income attributable to the Company	1,176	993	855
Basic weighted average common shares outstanding	544	542	540
Dilutive weighted average common shares outstanding	552	551	544
Segment, Continuing Operations [Member]
Net income from continuing operations	1,204	982	565
Less: Net income attributable to non-controlling interests	25	22	16
Net income attributable to the Company	1,179	960	549
Less: Portion attributable to participating securities	2	6	6
Net income attributable to common shares for diluted earnings per share	$ 1,177	$ 954	$ 543
Basic weighted average common shares outstanding	544	542	540
Dilutive effect of potentially issuable common shares	8	9	4
Dilutive weighted average common shares outstanding	552	551	544
Average stock price used to calculate common stock equivalents	$ 33.10	$ 29.40	$ 23.76

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Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2012

Discontinued Operations and Disposal Groups [Abstract]

Income Statement Data

Summarized Statements of Income data for discontinued operations is as follows:

For the Year Ended December 31,
(In millions of dollars)	2012			2011			2010
Kroll Operations
Revenue	$	—		$	—		$	381
Operating expenses	—			—			345
Operating income	—			—			36
Income tax expense	—			—			16
Income from Kroll operations, net of tax	—			—			20
Other discontinued operations, net of tax	—			(17		)	(7		)
Income (loss) from discontinued operations, net of tax	—			(17		)	13
Disposals of discontinued operations (a)	(2		)	25			58
Income tax (credit) expense (b)	1			(25		)	(235		)
Disposals of discontinued operations, net of tax	(3		)	50			293
Discontinued operations, net of tax	$	(3	)	$	33		$	306
Discontinued operations, net of tax per share
– Basic	$	—		$	0.06		$	0.55
– Diluted	$	—		$	0.06		$	0.55

(a) Includes gain on sale of Kroll and the gain on the sale of KLS in 2010.

(b) Includes the provision/(credit) for income taxes relating to the recognition of tax benefits recorded in connection with the sale of Kroll as well as a tax provision of $36 million on the sale of KLS in 2010.

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Goodwill And Other Intangibles (Tables)

12 Months Ended

Dec. 31, 2012

Goodwill And Other Intangibles [Abstract]

Changes in the Carrying Amount of Goodwill

Changes in the carrying amount of goodwill are as follows:

(In millions of dollars)	2012		2011
Balance as of January 1, as reported	$	6,562	$	6,420
Goodwill acquired	226		124
Other adjustments(a)	4		18
Balance at December 31,	$	6,792	$	6,562

(a) Reflects increases due to the impact of foreign exchange in both years. 2012 also reflects a reduction due to purchase accounting adjustments.

Amortized Intangible Assets

The gross cost and accumulated amortization at December 31, 2012 and 2011 is as follows:

(In millions of dollars)	2012						2011
	Gross Cost		Accumulated Amortization		Net Carrying Amount		Gross Cost		Accumulated Amortization		Net Carrying Amount
Amortized intangibles	$	814	$	345	$	469	$	666	$	265	$	401

Estimated Future Aggregate Amortization Expense

Aggregate amortization expense for the years ended December 31, 2012, 2011 and 2010 was $72 million, $65 million and $50 million, respectively, and the estimated future aggregate amortization expense is as follows:

For the Years Ending December 31,
(In millions of dollars)
2013	$	67
2014	64
2015	61
2016	50
2017	45
Subsequent years	182
	$	469

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Consolidated Statements Of Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Stockholders' Equity [Abstract]
Dividends equivalents declared per share	$ 0.90	$ 0.86	$ 0.81
Dividends declared per share	$ 0.90	$ 0.86	$ 0.81

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Tax Disclosure [Abstract]

Taxes on income

For financial reporting purposes, income before income taxes includes the following components: 

For the Years Ended December 31,
(In millions of dollars)	2012			2011		2010
Income before income taxes:
U.S.	$	398		$	121	$	(296	)
Other	1,298			1,283		1,065
	$	1,696		$	1,404	$	769
The expense (benefit) for income taxes is comprised of:
Income taxes:
Current–
U.S. Federal	$	42		$	7	$	(90	)
Other national governments	336			289		249
U.S. state and local	24			24		21
	402			320		180
Deferred–
U.S. Federal	(18		)	5		(28		)
Other national governments	89			90		50
U.S. state and local	19			7		2
	90			102		24
Total income taxes	$	492		$	422	$	204

Deferred income tax assets and liabilities

The significant components of deferred income tax assets and liabilities and their balance sheet classifications are as follows:  

December 31,
(In millions of dollars)	2012		2011
Deferred tax assets:
Accrued expenses not currently deductible	$	589	$	559
Differences related to non-U.S. operations (a)	159		188
Accrued retirement & postretirement benefits—non-U.S. operations	107		164
Accrued retirement benefits U.S.	604		507
Net operating losses (b)	104		129
Income currently recognized for tax	75		62
Foreign tax credit carryforwards	224		169
Other	77		114
	$	1,939	$	1,892

Deferred tax liabilities:
Unrealized investment holding gains	$	2	$	3
Differences related to non-U.S. operations	107		99
Depreciation and amortization	245		233
Other	4		9
	$	358	$	344

(a) Net of valuation allowances of $7 million in 2012 and $3 millionin 2011.

(b) Net of valuation allowances of $65 million in 2012 and $46 million in 2011.

Deferred Income Tax Assets And Liabilities Classification By Balance Sheet

December 31,
(In millions of dollars)	2012			2011
Balance sheet classifications:
Current assets	$	410		$	376
Other assets	$	1,223		$	1,205
Current liabilities	$	(18	)	$	(12	)
Other liabilities	$	(34	)	$	(21	)

U.S. Federal statutory income tax rate

A reconciliation from the U.S. Federal statutory income tax rate to the Company’s effective income tax rate is shown below.

For the Years Ended December 31,	2012		2011		2010
U.S. Federal statutory rate	35.0	%	35.0	%	35.0	%
U.S. state and local income taxes—net of U.S. Federal income tax benefit	1.9		1.6		1.9
Differences related to non-U.S. operations	(6.1	)	(6.5	)	(9.5	)
Other	(1.8	)	—		(0.9	)
Effective tax rate	29.0	%	30.1	%	26.5	%

Unrecognized tax benefits

Following is a reconciliation of the Company’s total gross unrecognized tax benefits for the years ended December 31, 2012, 2011 and 2010:

(In millions of dollars)	2012			2011			2010
Balance at January 1,	$	143		$	199		$	206
Additions, based on tax positions related to current year	26			7			7
Additions for tax positions of prior years	35			39			10
Reductions for tax positions of prior years	(41		)	(91		)	(6		)
Reductions due to reclassification of tax indemnifications on sale of Kroll	—			—			(3		)
Settlements	(6		)	(6		)	(4		)
Lapses in statutes of limitation	(40		)	(5		)	(11		)
Balance at December 31,	$	117		$	143		$	199

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Fair Value Measurements (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Fair value interest rate swap discount rate	1.60%
Assets transferred between Level 1 and Level 2	$ 0
Assets transferred between Level 2 To Level 3	0
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	44,000,000
Increase in Fair Value of Contigent Considertion Due to Five Percent Increase in Projections	30,000,000
Decrease in Fair Value of Contigent Considertion Due to 5% Decrease in Projections	20,000,000
Available-for-sale Securities, Amortized Cost Basis	16,000,000	38,000,000
Defined Contribution Plan, Fair Value of Plan Assets	19,000,000	20,000,000
Senior Debt Obligations Due 2014 [Member]
Fair value measurement on senior notes subject to interest rate swaps	$ 250,000,000

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Summary of Significant Accounting Policies (Narratives) (Details) (USD $) Share data in Millions, unless otherwise specified	1 Months Ended	12 Months Ended				3 Months Ended	12 Months Ended															0 Months Ended	12 Months Ended
	Jun. 30, 2010	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2013 Subsequent Event [Member]	Dec. 31, 2012 Consulting [Member]	Dec. 31, 2011 Consulting [Member]	Dec. 31, 2010 Consulting [Member]	Dec. 31, 2012 Risk and Insurance Services [Member]	Dec. 31, 2011 Risk and Insurance Services [Member]	Dec. 31, 2010 Risk and Insurance Services [Member]	Dec. 31, 2012 Furniture and Fixtures [Member] Minimum [Member]	Dec. 31, 2012 Furniture and Fixtures [Member] Maximum [Member]	Dec. 31, 2012 Land, Buildings and Improvements [Member] Minimum [Member]	Dec. 31, 2012 Land, Buildings and Improvements [Member] Maximum [Member]	Dec. 31, 2012 Software Development [Member] Minimum [Member]	Dec. 31, 2012 Software Development [Member] Maximum [Member]	Dec. 31, 2012 Private Equity Funds [Member]	Dec. 31, 2011 Private Equity Funds [Member]	Dec. 31, 2010 Private Equity Funds [Member]	Aug. 03, 2010 Kroll Divestiture [Member]	Dec. 31, 2011 Kroll Divestiture [Member]
Restricted Cash and Cash Equivalents			$ 250,000,000
Cash provided from sale of Kroll																						1,130,000,000	1,130,000,000
Interest on fiduciary funds							4,000,000	4,000,000	4,000,000	39,000,000	47,000,000	45,000,000
Net uncollected premiums and claims receivable and payable			9,100,000,000	9,000,000,000
Assets in trusts or funds for management or trustee fee			16,000,000,000
Performance fee revenue			78,000,000	74,000,000
Investment securities																			33,000,000	10,000,000	32,000,000
Equity method investments																			78,000,000
Indefinite-lived intangible assets			0
Capitalized software costs amortized period minimum, years													3 years	10 years	30 years	40 years	3 years	10 years
Capitalized computer software costs			278,000,000	244,000,000
Capitalized computer software costs net of accumulated amortization			691,000,000	619,000,000
Tax position, amount recognized, min			50.00%
Stock options outstanding			32.0	38.9	43.4
Amounts paid under terms of settlement agreement	500,000,000
Amount covered by insurance	100,000,000
Settlement agreement, recognized charge after insurance	400,000,000
Investment Income, Net						15,000,000
Proceeds from Equity Method Investment, Dividends or Distributions		$ 100,000,000

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Acquisitions (Allocation Of Acquisition Costs) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash (includes $62 million held in escrow at December 31, 2011)	$ 230	$ 160	$ 427
Estimated fair value of deferred/contingent consideration	46	33	81
Total Consideration	360
Cash and cash equivalents	22
Accounts receivable, net	8
Other current assets	0
Property, plant, and equipment	5
Intangible assets	147
Goodwill	226
Other assets	5
Total assets acquired	413
Current liabilities	13
Other liabilities	40
Total liabilities assumed	53
Net assets acquired	360
Current Year Acquisitions [Member]
Cash (includes $62 million held in escrow at December 31, 2011)	314
Estimated fair value of deferred/contingent consideration	46
Total Consideration	$ 360

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Retirement Benefits (Reconciliation of Net Actuarial Loss) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Total gain (loss) recognized as change in plan assets and benefit obligations	$ 299	$ 779	$ 90
U.S. Pension Benefits [Member]
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Amount disclosed as of prior year-end	(1,695)	(1,327)
Recognized as component of net periodic benefit cost	152	100
Liability experience	(522)	(352)
Asset experience	178	(116)
Total gain (loss) recognized as change in plan assets and benefit obligations	(344)	(468)
Amount at end of year	(1,887)	(1,695)
Non- U.S Pension Benefits [Member]
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Amount disclosed as of prior year-end	(3,038)	(2,305)
Recognized as component of net periodic benefit cost	118	115
Effect of settlement	1	0	5
Liability experience	(419)	(575)
Asset experience	138	(261)
Effect of curtailment	3	(1)
Total gain (loss) recognized as change in plan assets and benefit obligations	(278)	(837)
Exchange rate adjustments	(112)	(11)
Amount at end of year	(3,309)	(3,038)	(2,305)
U.S. Postretirement Benefits [Member]
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Amount disclosed as of prior year-end	12	(4)
Recognized as component of net periodic benefit cost	(1)	(4)
Liability experience	(13)	20
Asset experience	0	0
Total gain (loss) recognized as change in plan assets and benefit obligations	(13)	20
Amount at end of year	(2)	12
Non- U.S Postretirement Benefits [Member]
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Amount disclosed as of prior year-end	(19)	(14)
Recognized as component of net periodic benefit cost	1	0
Effect of settlement	0	0	0
Liability experience	(10)	(5)
Asset experience	0	0
Effect of curtailment	1	0
Total gain (loss) recognized as change in plan assets and benefit obligations	(9)	(5)
Exchange rate adjustments	0	0
Amount at end of year	$ (27)	$ (19)	$ (14)

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Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Statement [Abstract]
Revenue	$ 11,924	$ 11,526	$ 10,550
Expense:
Compensation and benefits	7,134	6,969	6,465
Other operating expenses	2,961	2,919	3,146
Operating expenses	10,095	9,888	9,611
Operating income	1,829	1,638	939
Interest income	24	28	20
Interest expense	(181)	(199)	(233)
Cost of extinguishment of debt		(72)
Investment income	24	9	43
Income before income taxes	1,696	1,404	769
Income tax expense	492	422	204
Income from continuing operations	1,204	982	565
Discontinued operations, net of tax	(3)	33	306
Net income before non-controlling interests	1,201	1,015	871
Less: Net income attributable to non-controlling interests	25	22	16
Net income attributable to the Company	$ 1,176	$ 993	$ 855
Basic net income per share
- Continuing operations	$ 2.16	$ 1.76	$ 1.01
- Net income attributable to the Company	$ 2.16	$ 1.82	$ 1.56
Diluted net income per share
- Continuing operations	$ 2.13	$ 1.73	$ 1.00
- Net income attributable to the Company	$ 2.13	$ 1.79	$ 1.55
Average number of shares outstanding
- Basic	544	542	540
- Diluted	552	551	544
Shares outstanding at December 31,	545	539	541

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Summary of Significant Accounting Policies (Diluted EPS Calculation for Net Income) (Details) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income attributable to the Company	$ 1,176	$ 993	$ 855
Basic weighted average common shares outstanding	544	542	540
Dilutive weighted average common shares outstanding	552	551	544
Net Income [Member]
Net income attributable to the Company	1,176	993	855
Less: Portion attributable to participating securities	2	6	11
Net income attributable to common shares for diluted earnings per share	$ 1,174	$ 987	$ 844
Basic weighted average common shares outstanding	544	542	540
Dilutive effect of potentially issuable common shares	8	9	4
Dilutive weighted average common shares outstanding	552	551	544
Average stock price used to calculate common stock equivalents	$ 33.10	$ 29.40	$ 23.76

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Common Stock (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011
Class of Stock Disclosures [Abstract]
Payments for repurchase of common stock	$ 361	$ 230
Stock repurchase program, remaining authorized repurchase amount		$ 323
Common stock repurchased		6.9	12.3

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Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating cash flows:
Net income before non-controlling interests	$ 1,201	$ 1,015	$ 871
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization of fixed assets and capitalized software	277	267	291
Amortization of intangible assets	72	65	66
Intangible asset impairment	8
Adjustments to acquisition related contingent consideration liability	(44)
Charge for early extinguishment of debt		72
Provision for deferred income taxes	96	178	16
Gain on investments	(24)	(8)	(40)
Loss (gain) on disposition of assets	23	35	(17)
Stock option expense	26	21	18
Changes in assets and liabilities:
Net receivables	(144)	143	(216)
Other current assets	(37)	(225)	51
Other assets	(177)	(94)	(216)
Accounts payable and accrued liabilities	(210)	108	(55)
Accrued compensation and employee benefits	72	107	(13)
Accrued income taxes	44	1	32
Other liabilities	174	32	(145)
Effect of exchange rate changes	(35)	(12)	79
Net cash provided by operations	1,322	1,705	722
Financing cash flows:
Purchase of treasury shares	(230)	(361)	(86)
Proceeds from issuance of debt	248	496
Repayments of debt	(259)	(11)	(559)
Payments for early extinguishment of debt		(672)
Purchase of non-controlling interests		(21)	(15)
Shares withheld for taxes on vested units – treasury shares	(97)	(93)	(59)
Issuance of common stock	248	162	41
Payments of contingent consideration for acquisitions	(30)	(16)
Distributions to non-controlling interests	(16)	(11)
Dividends paid	(497)	(480)	(452)
Net cash used for financing activities	(633)	(1,007)	(1,130)
Investing cash flows:
Capital expenditures	(320)	(280)	(271)
Net sales of long-term investments	20	62	91
Proceeds from sales of fixed assets	6	3	6
Dispositions			1,202
Acquisitions	(292)	(237)	(492)
Other, net	3	(5)	(1)
Net cash (used for) provided by investing activities	(583)	(457)	535
Effect of exchange rate changes on cash and cash equivalents	82	(22)	(10)
Increase in cash and cash equivalents	188	219	117
Cash and cash equivalents at beginning of period	2,113	1,894	1,777
Cash and cash equivalents at end of period	$ 2,301	$ 2,113	$ 1,894

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Integration and Restructuring Costs (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended				3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2012 Consulting [Member]	Dec. 31, 2012 Acquisition Related [Member]	Dec. 31, 2012 Disposal of Canadian Outsourcing Business, Mercer [Member]	Dec. 31, 2012 Consulting [Member]	Dec. 31, 2012 Acquisition Related, Risk and Insurance Services [Member]	Dec. 31, 2012 Corporate Restructuring [Member]
Restructuring actions costs	$ 78				$ 51	$ 1	$ 16	$ 58	$ 8	$ 12
Liability balance	170	181	211	259
Restructuring and Related Cost, Incurred Cost	78	51	141
Payments for restructuring	$ 88	$ 82	$ 189

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Goodwill And Other Intangibles (Amortized Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Goodwill And Other Intangibles [Abstract]
Gross Cost	$ 814	$ 666
Accumulated Amortization	345	265
Net Carrying Amount	$ 469	$ 401

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Segment Information (Selected Information and Details Of Operating Segment Revenue) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net, Originally Reported	$ 11,924	$ 11,526	$ 10,550
Sales Revenue, Services, Net, Adjusted	0	0	0
Revenue	11,924	11,526	10,550
Operating Income (Loss), Originally Reported	1,829	1,638	939
Operating Income (Loss), Adjusted	0	0	0
Operating Income (Loss)	1,829	1,638	939
Fixed Assets, Net	809	804	822
Total Consolidated [Member]
Segment Reporting Information [Line Items]
Revenue	11,924	11,526	10,550
Operating Income (Loss)	1,829	1,638	939
Marsh [Member]
Segment Reporting Information [Line Items]
Revenue	5,265	5,031	4,574
Guy Carpenter [Member]
Segment Reporting Information [Line Items]
Revenue	1,085	1,048	983
Risk and Insurance Services [Member]
Segment Reporting Information [Line Items]
Revenue	6,350	6,079	5,557
Operating Income (Loss)	1,334	1,200	957
Mercer [Member]
Segment Reporting Information [Line Items]
Revenue	4,147	4,004	3,685
Oliver Wyman Group [Member]
Segment Reporting Information [Line Items]
Revenue	1,466	1,483	1,357
Consulting [Member]
Segment Reporting Information [Line Items]
Revenue	5,613	5,487	5,042
Operating Income (Loss)	692	617	144
Total Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	11,963	11,566	10,599
Operating Income (Loss)	2,026	1,817	1,101
Corporate / Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(39)	(40)	(49)
Operating Income (Loss)	(197)	(179)	(162)
United States [Member]
Segment Reporting Information [Line Items]
Revenue	5,300	5,131	4,708
Fixed Assets, Net	494	505	511
United Kingdom [Member]
Segment Reporting Information [Line Items]
Revenue	1,960	1,922	1,720
Fixed Assets, Net	121	133	132
Continental Europe [Member]
Segment Reporting Information [Line Items]
Revenue	1,879	1,906	1,809
Fixed Assets, Net	63	65	69
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenue	1,346	1,287	1,067
Fixed Assets, Net	62	37	43
Other Geographic Areas [Member]
Segment Reporting Information [Line Items]
Revenue	1,478	1,320	1,295
Fixed Assets, Net	69	64	67
Corporate / Eliminations [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net, Originally Reported	(39)	(40)	(49)
Sales Revenue, Services, Net, Adjusted	0	0	0
Operating Income (Loss), Originally Reported	(197)	(179)	(162)
Operating Income (Loss), Adjusted	0	0	0
Total Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net, Originally Reported	11,963	11,566	10,599
Sales Revenue, Services, Net, Adjusted	0	0	0
Operating Income (Loss), Originally Reported	2,026	1,817	1,101
Operating Income (Loss), Adjusted	0	0	0
Consulting [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net, Originally Reported	5,382	5,265	4,835
Sales Revenue, Services, Net, Adjusted	231	222	207
Operating Income (Loss), Originally Reported	652	588	129
Operating Income (Loss), Adjusted	40	29	15
Risk and Insurance Services [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net, Originally Reported	6,581	6,301	5,764
Sales Revenue, Services, Net, Adjusted	(231)	(222)	(207)
Operating Income (Loss), Originally Reported	1,374	1,229	972
Operating Income (Loss), Adjusted	$ (40)	$ (29)	$ (15)

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2012

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 December 31, 2012 and 2011.

(In millions of dollars)	Identical Assets (Level 1)				Observable Inputs (Level 2)				Unobservable Inputs (Level 3)				Total
	12/31/12		12/31/11		12/31/12		12/31/11		12/31/12		12/31/11		12/31/12		12/31/11
Assets:
Financial instruments owned:
Mutual funds(a)	$	139	$	134	$	—	$	—	$	—	$	—	$	139	$	134
Money market funds(b)	483		226		—		—		—		—		483		226
Interest rate swap derivatives(c)	—		—		6		7		—		—		6		7
Total assets measured at fair value	$	622	$	360	$	6	$	7	$	—	$	—	$	628	$	367
Fiduciary Assets:
State and local obligations (including non-U.S. locales)	$	—	$	—	$	3	$	13	$	—	$	—	$	3	$	13
Other sovereign government obligations and supranational agencies	—		—		—		47		—		—		—		47
Corporate and other debt	—		—		—		2		—		—		—		2
Money market funds	149		186		—		—		—		—		149		186
Total fiduciary assets measured at fair value	$	149	$	186	$	3	$	62	$	—	$	—	$	152	$	248
Liabilities:
Contingent purchase consideration liability(d)	$	—	$	—	$	—	$	—	$	63	$	110	$	63	$	110
Senior Notes due 2014(e)	$	—	$	—	$	256	$	257	$	—	$	—	$	256	$	257
Total liabilities measured at fair value	$	—	$	—	$	256	$	257	$	63	$	110	$	319	$	367

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

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

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

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

(e) Included in long term debt 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 years ended December 31, 2012 and December 31, 2011 that represent contingent purchase consideration related to acquisitions:

(In millions of dollars)	2012			2011
Balance at January 1,	$	110		$	106
Additions	27			14
Payments	(30		)	(13		)
Revaluation Impact	(44		)	3
Balance at December 31,	$	63		$	110

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Income Taxes (Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 143	$ 199	$ 206
Additions, based on tax positions related to current year	26	7	7
Additions for tax positions of prior years	35	39	10
Reductions for tax positions of prior years	(41)	(91)	(6)
Reductions due to reclassification of tax indemnifications on sale of Kroll	0	0	(3)
Settlements	(6)	(6)	(4)
Lapses in statutes of limitation	(40)	(5)	(11)
Balance at December 31	$ 117	$ 143	$ 199

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Common Stock

12 Months Ended

Dec. 31, 2012

Class of Stock Disclosures [Abstract]

Common Stock

Common Stock

During 2012, the Company repurchased 6.9 million shares of its common stock for total consideration of $230 million. The Company remains authorized to purchase additional shares of its common stock up to a value of $323 million. During 2011, the Company purchased 12.3 million shares of its common stock for total consideration of $361 million.

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Long-Term Commitments (Tables)

12 Months Ended

Dec. 31, 2012

Long-Term Commitments [Abstract]

Operating Leases of Lessee Disclosure

At December 31, 2012, the aggregate future minimum rental commitments under all non-cancelable operating lease agreements are as follows:

For the Years Ended December 31,	Gross Rental Commitments		Rentals from Subleases		Net Rental Commitments
(In millions of dollars)
2013	$	404	$	49	$	355
2014	$	359	$	48	$	311
2015	$	315	$	43	$	272
2016	$	279	$	42	$	237
2017	$	236	$	40	$	196
Subsequent years	$	1,227	$	109	$	1,118

Future Minimum Rental Commitments

At December 31, 2012, the aggregate fixed future minimum commitments under these agreements are as follows:

For the Years Ended December 31,	Future Minimum Commitments
(In millions of dollars)
2013	$	168
2014	87
2015	48
Subsequent years	118
	$	421

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Segment Information (Details For MMC's Operating Segments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Segment Reporting Information [Line Items]
Revenue	$ 11,924		$ 11,526		$ 10,550
Operating Income (Loss)	1,829		1,638		939
Total Assets	16,288		15,454
Risk and Insurance Services [Member]
Segment Reporting Information [Line Items]
Revenue	6,350		6,079		5,557
Operating Income (Loss)	1,334		1,200		957
Total Assets	9,832		9,102		9,318
Depreciation and Amortization	196		189		175
Capital Expenditures	131		146		144
Inter-segment revenue	5		4		7
Interest income on fiduciary funds	39		47		45
Equity method income	11		14		12
Consulting [Member]
Segment Reporting Information [Line Items]
Revenue	5,613		5,487		5,042
Operating Income (Loss)	692		617		144
Total Assets	5,203		4,820		4,537
Depreciation and Amortization	113		112		115
Capital Expenditures	117		91		80
Inter-segment revenue	34		36		43
Interest income on fiduciary funds	4		4		4
Total Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	11,963		11,566		10,599
Operating Income (Loss)	2,026		1,817		1,101
Total Assets	15,035		13,922		13,855
Depreciation and Amortization	309		301		290
Capital Expenditures	248		237		224
Corporate / Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(39)		(40)		(49)
Operating Income (Loss)	(197)		(179)		(162)
Total Assets	1,253	[1]	1,532	[1]	1,455	[1]
Depreciation and Amortization	40		31		29
Capital Expenditures	72		43		34
Total Consolidated [Member]
Segment Reporting Information [Line Items]
Revenue	11,924		11,526		10,550
Operating Income (Loss)	1,829		1,638		939
Total Assets	16,288		15,454		15,310
Depreciation and Amortization	349		332		319
Capital Expenditures	$ 320		$ 280		$ 258

[1] Corporate assets primarily include insurance recoverables, pension related assets, the owned portion of the Company headquarters building and intercompany eliminations.

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Segment Information

12 Months Ended

Dec. 31, 2012

Segment Information [Abstract]

Segment Information

 Segment Information

The Company is organized based on the types of services provided. Under this organizational 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. 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.

Effective January 1, 2013, the Corporate Benefits and Association businesses, previously part of Marsh's U.S. Consumer operations in the Risk and Insurance Services segment, were transferred to Mercer. Accordingly, these businesses are now part of the Consulting segment. The segment data presented below reflects the impact of this transfer as of the beginning of the earliest period presented.

Selected information about the Company’s segments and geographic areas of operation are as follows:

For the Year Ended December 31, (In millions)	Revenue				Operating Income (Loss)				Total Assets			Depreciation and Amortization		Capital Expenditures
2012 –
Risk and Insurance Services	$	6,350		(a)	$	1,334			$	9,832		$	196	$	131
Consulting	5,613			(b)	692				5,203			113		117
Total Operating Segments	11,963				2,026				15,035			309		248
Corporate / Eliminations	(39		)	(c)	(197		)	(c)	1,253		(d)	40		72
Total Consolidated	$	11,924			$	1,829			$	16,288		$	349	$	320
2011 –
Risk and Insurance Services	$	6,079		(a)	$	1,200			$	9,102		$	189	$	146
Consulting	5,487			(b)	617				4,820			112		91
Total Operating Segments	11,566				1,817				13,922			301		237
Corporate / Eliminations	(40		)	(c)	(179		)	(c)	1,532		(d)	31		43
Total Consolidated	$	11,526			$	1,638			$	15,454		$	332	$	280
2010 –
Risk and Insurance Services	$	5,557		(a)	$	957			$	9,318		$	175	$	144
Consulting	5,042			(b)	144				4,537			115		80
Total Operating Segments	10,599				1,101				13,855			290		224
Corporate / Eliminations	(49		)	(c)	(162		)	(c)	1,455		(d)	29		34
Total Consolidated	$	10,550			$	939			$	15,310		$	319	$	258

(a) Includes inter-segment revenue of $5 million, $4 million and $7 million in 2012, 2011 and 2010, respectively, interest income on fiduciary funds of $39 million, $47 million and $45 million in 2012, 2011 and 2010, respectively, and equity method income of $11 million, $14 million and $12 million in 2012, 2011 and 2010, respectively.

(b) Includes inter-segment revenue of $34 million, $36 million and $43 million in 2012, 2011 and 2010, respectively, and interest income on fiduciary funds of $4 million in 2012, 2011 and 2010.

(c) Includes results of corporate advisory and restructuring business.

(d) Corporate assets primarily include insurance recoverables, pension related assets, the owned portion of the Company headquarters building and intercompany eliminations.

Details of operating segment revenue are as follows:

For the Years Ended December 31,
(In millions of dollars)	2012			2011			2010
Risk and Insurance Services
Marsh	$	5,265		$	5,031		$	4,574
Guy Carpenter	1,085			1,048			983
Total Risk and Insurance Services	6,350			6,079			5,557
Consulting
Mercer	4,147			4,004			3,685
Oliver Wyman Group	1,466			1,483			1,357
Total Consulting	5,613			5,487			5,042
Total Operating Segments	11,963			11,566			10,599
Corporate/ Eliminations	(39		)	(40		)	(49		)
Total	$	11,924		$	11,526		$	10,550

Information by geographic area is as follows:

For the Years Ended December 31,
(In millions of dollars)	2012			2011			2010
Revenue
United States	$	5,300		$	5,131		$	4,708
United Kingdom	1,960			1,922			1,720
Continental Europe	1,879			1,906			1,809
Asia Pacific	1,346			1,287			1,067
Other	1,478			1,320			1,295
	11,963			11,566			10,599
Corporate/Eliminations	(39		)	(40		)	(49		)
	$	11,924		$	11,526		$	10,550

For the Years Ended December 31,
(In millions of dollars)	2012		2011		2010
Fixed Assets, Net
United States	$	494	$	505	$	511
United Kingdom	121		133		132
Continental Europe	63		65		69
Asia Pacific	62		37		43
Other	69		64		67
	$	809	$	804	$	822

The impact of the transfer discussed above is as follows:

	Revenue									Operating Income
	As Reported			Reclassification			Current Presentation			As Reported			Reclassification			Current  Presentation
2012 -
Risk and Insurance Services	$	6,581		$	(231	)	$	6,350		$	1,374		$	(40	)	$	1,334
Consulting	5,382			231			5,613			652			40			692
Total Operating Segments	11,963			—			11,963			2,026			—			2,026
Corporate/Eliminations	(39		)	—			(39		)	(197		)	—			(197		)
Total Consolidated	$	11,924		$	—		$	11,924		$	1,829		$	—		$	1,829
2011 -
Risk and Insurance Services	$	6,301		$	(222	)	$	6,079		$	1,229		$	(29	)	$	1,200
Consulting	5,265			222			5,487			588			29			617
Total Operating Segments	11,566			—			11,566			1,817			—			1,817
Corporate/Eliminations	(40		)	—			(40		)	(179		)	—			(179		)
Total Consolidated	$	11,526		$	—		$	11,526		$	1,638		$	—		$	1,638
2010 -
Risk and Insurance Services	$	5,764		$	(207	)	$	5,557		$	972		$	(15	)	$	957
Consulting	4,835			207			5,042			129			15			144
Total Operating Segments	10,599			—			10,599			1,101			—			1,101
Corporate/Eliminations	(49		)	—			(49		)	(162		)	—			(162		)
Total Consolidated	$	10,550		$	—		$	10,550		$	939		$	—		$	939

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of

Marsh & McLennan Companies, Inc.

New York, New York

We have audited the accompanying consolidated balance sheets of Marsh & McLennan Companies, Inc. and subsidiaries (the “Company”) as of December 31, 2012 and 2011, and the related consolidated statements of income, comprehensive income, cash flows and equity for each of the three years in the period ended December 31, 2012.  These financial statements are the responsibility of the Company's management.  Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States).  Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement.  An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements.  An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation.  We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such consolidated financial statements present fairly, in all material respects, the financial position of Marsh & McLennan Companies, Inc. and subsidiaries as of December 31, 2012 and 2011, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2012, in conformity with accounting principles generally accepted in the United States of America.

As discussed in Note 1 to the financial statements, the Company retrospectively adjusted segment disclosures for a transfer of business between segments effective January 1, 2013.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Company's internal control over financial reporting as of December 31, 2012, based on the criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 27, 2013 expressed an unqualified opinion on the Company's internal control over financial reporting.

/s/ Deloitte & Touche LLP

New York, New York

February 27, 2013

(May 10, 2013 as to Notes 1, 6 and 16)

Marsh & McLennan Companies, Inc. and Subsidiaries

SELECTED QUARTERLY FINANCIAL DATA AND

SUPPLEMENTAL INFORMATION (UNAUDITED)

	First Quarter		Second Quarter			Third Quarter		Fourth Quarter
(In millions, except per share figures)
2012:
Revenue	$	3,051	$	3,026		$	2,845	$	3,002
Operating income	$	527	$	518		$	378	$	406
Income from continuing operations	$	354	$	339		$	246	$	265
Income (loss) from discontinued operations	$	—	$	(2	)	$	1	$	(2	)
Net income attributable to the Company	$	347	$	329		$	241	$	259
Basic Per Share Data:
Income from continuing operations	$	0.64	$	0.61		$	0.44	$	0.48
Income (loss) from discontinued operations	$	—	$	(0.01	)	$	—	$	—
Net income attributable to the Company	$	0.64	$	0.60		$	0.44	$	0.48
Diluted Per Share Data:
Income from continuing operations	$	0.63	$	0.60		$	0.43	$	0.47
Income (loss) from discontinued operations	$	—	$	(0.01	)	$	0.01	$	—
Net income attributable to the Company	$	0.63	$	0.59		$	0.44	$	0.47
Dividends Paid Per Share	$	0.22	$	0.22		$	0.23	$	0.23
2011:
Revenue	$	2,884	$	2,928		$	2,806	$	2,908
Operating income	$	472	$	465		$	310	$	391
Income from continuing operations	$	319	$	286		$	133	$	244
Income from discontinued operations	$	12	$	3		$	2	$	16
Net income attributable to the Company	$	325	$	282		$	130	$	256
Basic Per Share Data:
Income from continuing operations	$	0.57	$	0.51		$	0.24	$	0.44
Income from discontinued operations	$	0.02	$	—		$	—	$	0.03
Net income attributable to the Company	$	0.59	$	0.51		$	0.24	$	0.47
Diluted Per Share Data:
Income from continuing operations	$	0.56	$	0.50		$	0.23	$	0.44
Income from discontinued operations	$	0.02	$	—		$	0.01	$	0.02
Net income attributable to the Company	$	0.58	$	0.50		$	0.24	$	0.46
Dividends Paid Per Share	$	0.21	$	0.21		$	0.22	$	0.22

As of February 22, 2013 there were 6,840 stockholders of record.

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Retirement Benefits (Components of the Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Plans, Defined Benefit [Member]
Service cost	$ 240	$ 226	$ 197
Interest cost	596	609	578
Expected return on plan assets	(905)	(887)	(815)
Amortization of prior service credit	(19)	(19)	(21)
Recognized actuarial loss (credit)	270	215	144
Net periodic benefit cost (credit)	182	144	83
U.S. Pension Benefits [Member]
Service cost	93	83	76
Interest cost	230	231	227
Expected return on plan assets	(322)	(315)	(295)
Amortization of prior service credit	(16)	(16)	(18)
Recognized actuarial loss (credit)	152	100	71
Net periodic benefit cost (credit)	137	83	61
Non- U.S Pension Benefits [Member]
Service cost	147	143	121
Interest cost	366	378	351
Expected return on plan assets	(583)	(572)	(520)
Amortization of prior service credit	(3)	(3)	(3)
Recognized actuarial loss (credit)	118	115	73
Net periodic benefit cost (credit)	45	61	22
Settlement (credit)/loss	1	0	5
Curtailment (credit)/loss	(1)	0	0
Special termination benefits	0	0	1
Total cost (credit)	45	61	28
Postretirement Benefits [Member]
Service cost	5	5	4
Interest cost	13	13	14
Expected return on plan assets	0	0	0
Amortization of prior service credit	(14)	(13)	(13)
Recognized actuarial loss (credit)	0	(4)	0
Net periodic benefit cost (credit)	4	1	5
U.S. Postretirement Benefits [Member]
Service cost	3	3	3
Interest cost	8	8	10
Expected return on plan assets	0	0	0
Amortization of prior service credit	(13)	(13)	(13)
Recognized actuarial loss (credit)	(1)	(4)	0
Net periodic benefit cost (credit)	(3)	(6)	0
Non- U.S Postretirement Benefits [Member]
Service cost	2	2	1
Interest cost	5	5	4
Expected return on plan assets	0	0	0
Amortization of prior service credit	(1)	0	0
Recognized actuarial loss (credit)	1	0	0
Net periodic benefit cost (credit)	7	7	5
Settlement (credit)/loss	0	0	0
Curtailment (credit)/loss	0	0	0
Special termination benefits	0	0	0
Total cost (credit)	$ 7	$ 7	$ 5

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Consolidated Statements Of Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Gain (Loss) [Member]	Treasury Shares [Member]	Non-Controlling Interests [Member]
Balance, beginning of year at Dec. 31, 2009			$ 1,211	$ 7,033	$ (2,171)	$ (806)	$ 35
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the Company	855			855
Comprehensive loss, net of tax	(129)
Net income attributable to non-controlling interests	(16)						16
Purchase of subsidiary shares from non-controlling interests
Change in accrued stock compensation costs			6
Dividend equivalents declared - (per share amounts: $0.90 in 2012, $0.86 in 2011, and $0.81 in 2010)				(15)
Issuance of shares under stock compensation plans and employee stock purchase plans and related tax impact			(17)
Issuance of shares under stock compensation plans and employee stock purchase plans						180
Dividends declared – (per share amounts: $0.90 in 2012, $0.86 in 2011, and $0.81 in 2010)				(437)
Other changes							(4)
Issuance of shares for acquisitions			(15)			198
Purchase of treasury shares						(86)
Balance, end of period at Dec. 31, 2010	6,415	561	1,185	7,436	(2,300)	(514)	47
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the Company	993			993
Comprehensive loss, net of tax	(888)
Net income attributable to non-controlling interests	(22)						22
Purchase of subsidiary shares from non-controlling interests			(2)				(5)
Change in accrued stock compensation costs			(13)
Dividend equivalents declared - (per share amounts: $0.90 in 2012, $0.86 in 2011, and $0.81 in 2010)				(14)
Issuance of shares under stock compensation plans and employee stock purchase plans and related tax impact			(14)
Issuance of shares under stock compensation plans and employee stock purchase plans						280
Dividends declared – (per share amounts: $0.90 in 2012, $0.86 in 2011, and $0.81 in 2010)				(466)
Other changes							(7)
Issuance of shares for acquisitions
Purchase of treasury shares						(361)
Balance, end of period at Dec. 31, 2011	5,940	561	1,156	7,949	(3,188)	(595)	57
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the Company	1,176			1,176
Comprehensive loss, net of tax	(119)
Net income attributable to non-controlling interests	(25)						25
Purchase of subsidiary shares from non-controlling interests			1				(16)
Change in accrued stock compensation costs			(16)
Dividend equivalents declared - (per share amounts: $0.90 in 2012, $0.86 in 2011, and $0.81 in 2010)				(8)
Issuance of shares under stock compensation plans and employee stock purchase plans and related tax impact			(34)
Issuance of shares under stock compensation plans and employee stock purchase plans						378
Dividends declared – (per share amounts: $0.90 in 2012, $0.86 in 2011, and $0.81 in 2010)				(489)
Other changes							(2)
Issuance of shares for acquisitions						0
Purchase of treasury shares						(230)
Balance, end of period at Dec. 31, 2012	$ 6,606	$ 561	$ 1,107	$ 8,628	$ (3,307)	$ (447)	$ 64

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Statements of Consolidated Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income before non-controlling interests	$ 1,201	$ 1,015	$ 871
Other comprehensive income (loss), before tax:
Foreign currency translation adjustments	177	(100)	(34)
Unrealized investment loss	(1)	(9)	(17)
Loss related to pension/post-retirement plans	(447)	(1,114)	(146)
Other comprehensive loss, before tax	(271)	(1,223)	(197)
Income tax credit on other comprehensive loss	(152)	(335)	(68)
Other comprehensive loss, net of tax	(119)	(888)	(129)
Comprehensive income	1,082	127	742
Less: Comprehensive income attributable to non-controlling interests	25	22	16
Comprehensive income attributable to the Company	$ 1,057	$ 105	$ 726

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Stock Benefit Plans

12 Months Ended

Dec. 31, 2012

Stock Benefit Plans [Abstract]

Stock Benefit Plans

Stock Benefit Plans

The Company maintains multiple stock-based payment arrangements under which employees are awarded grants of restricted stock units, stock options and other forms of stock-based payment arrangements.

Marsh & McLennan Companies, Inc. Incentive and Stock Award Plans

On May 19, 2011, the Marsh & McLennan Companies, Inc. 2011 Incentive and Stock Award Plan (the “2011 Plan”) was approved by the Company's stockholders. The 2011 Plan replaced the Company's two previous equity incentive plans (the 2000 Senior Executive Incentive and Stock Award Plan and the 2000 Employee Incentive and Stock Award Plan).

The types of awards permitted under the 2011 Plan include stock options, restricted stock and restricted stock units payable in Company common stock or cash, and other stock-based and performance-based awards. The Compensation Committee of the Board of Directors (the “Compensation Committee”) determines, at its discretion, which affiliates may participate in the 2011 Plan, which eligible employees will receive awards, the types of awards to be received, and the terms and conditions thereof. The right of an employee to receive an award may be subject to performance conditions as specified by the Compensation Committee. The 2011 Plan contains provisions which, in the event of a change in control of the Company, may accelerate the vesting of the awards. The 2011 Plan retains the remaining share authority of the two previous plans as of the date the 2011 Plan was approved by stockholders. Awards relating to not more than approximately 23.2 million shares of common stock, plus shares remaining unused under certain pre-existing plans, may be made over the life of the 2011 Plan.

Our current practice is to grant non-qualified stock options, restricted stock units and/or performance stock units on an annual basis to senior executives and a limited number of other employees as part of their total compensation. We also grant restricted stock units during the year to new hires or as retention awards for certain employees. We have not granted restricted stock since 2005.

Stock Options: Options granted under the 2011 Plan may be designated as either incentive stock options or non-qualified stock options. The Compensation Committee determines the terms and conditions of the option, including the time or times at which an option may be exercised, the methods by which such exercise price may be paid, and the form of such payment. Options are generally granted with an exercise price equal to the market value of the Company's common stock on the date of grant. These option awards generally vest 25% per annum and have a contractual term of 10 years. Certain stock options granted under the previous equity incentive plans provided for a market-based triggering event before a vested option can be exercised. The terms and conditions of these stock option awards provided that (i) options will vest at a rate of 25% a year beginning one year from the date of grant and (ii) each vested tranche will only become exercisable if the market price of the Company stock appreciates to a level of 15% above the exercise price of the option and maintains that level for at least ten (10) consecutive trading days after the award has vested. The Company accounts for these awards as market-condition options. The effect of the market condition is reflected in the grant-date fair value of such awards. Compensation cost is recognized over the requisite service period and is not subsequently adjusted if the market condition is not met. For awards without a market-based triggering event, compensation cost is generally recognized on a straight-line basis over the requisite service period which is normally the vesting period.

The estimated fair value of options granted without a market-based triggering event is calculated using the Black-Scholes option pricing valuation model. This model takes into account several factors and assumptions. The risk-free interest rate is based on the yield on U.S. Treasury zero-coupon issues with a remaining term equal to the expected life assumption at the time of grant. The expected life (estimated period of time outstanding) is estimated using the contractual term of the option and the effects of employees' expected exercise and post-vesting employment termination behavior. The Company uses a blended volatility rate based on the following: (i) volatility derived from daily closing price observations for the 10-year period ended on the valuation date, (ii) implied volatility derived from traded options for the period one week before the valuation date and (iii) average volatility for the 10-year periods ended on 15 anniversaries prior to the valuation date, using daily closing price observations. The expected dividend yield is based on expected dividends for the expected term of the stock options.

The assumptions used in the Black-Scholes option pricing valuation model for options granted by the Company in 2012, 2011 and 2010 are as follows:

	2012	2011	2010
Risk-free interest rate	1.26%-1.27%	2.28%-2.90%	3.15%-3.20%
Expected life (in years)	6.50	6.75	6.75
Expected volatility	26.2%-26.4%	25.4%-25.8%	26.3%-27.6%
Expected dividend yield	2.76%-2.80%	2.75%-2.86%	3.26%-3.52%

The estimated fair value of options granted with a market-based triggering event is calculated using a binomial valuation model. The factors and assumptions used in this model are similar to those utilized in the Black-Scholes option pricing valuation model except that the risk-free interest rate is based on the U.S. Treasury zero-coupon yield curve over the contractual term of the option, and the expected life is calculated by the model. Since 2009, there have been no options granted with a market-based triggering event.

A summary of the status of the Company’s stock option awards as of December 31, 2012 and changes during the year then ended is presented below:

	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value ($000)
Balance at January 1, 2012	38,895,109		$	29.21
Granted	3,547,733		$	31.88
Exercised	(6,892,731	)	$	26.01
Canceled or exchanged	—		—
Forfeited	(860,022	)	$	27.69
Expired	(2,644,296	)	$	42.85
Balance at December 31, 2012	32,045,793		$	29.10	4.5 years	186,467
Options vested or expected to vest at December 31, 2012	32,004,297		$	29.12	4.4 years	185,871
Options exercisable at December 31, 2012	16,115,605		$	28.85	3.8 years	106,606

In the above table, forfeited options are unvested options whose requisite service period has not been met. Expired options are vested options that were not exercised. The weighted-average grant-date fair value of the Company's option awards granted during the years ended December 31, 2012, 2011 and 2010 was $6.04, $6.67 and $4.85, respectively. The total intrinsic value of options exercised during the same periods was $57.7 million, $23.6 million and $0.5 million, respectively.

As of December 31, 2012, there was $18 million of unrecognized compensation cost related to the Company's option awards. The weighted-average period over which that cost is expected to be recognized is approximately 1.3 years. Cash received from the exercise of stock options for the years ended December 31, 2012, 2011 and 2010 was $179.3 million, $111.7 million and $1.5 million, respectively.

The Company's policy is to issue treasury shares upon option exercises or share unit conversion. The

Company intends to issue treasury shares as long as an adequate number of those shares are available.

Restricted Stock Units and Performance Stock Units: Restricted stock units may be awarded under the Company's 2011 Incentive and Stock Award Plan. The Compensation Committee determines the restrictions on such units, when the restrictions lapse, when the units vest and are paid, and under what terms the units are forfeited. The cost of these awards is amortized over the vesting period, which is generally three years. Awards to senior executives and other employees may include three-year performance-based restricted stock units and three-year service-based restricted stock units. The payout of performance-based restricted stock units (payable in shares of the Company's common stock) may range, generally, from 0-200% of the number of units granted, based on the achievement of objective, pre-determined Company or operating company performance measures, generally, over a three-year performance period. The Company accounts for these awards as performance condition restricted stock units. The performance condition is not considered in the determination of grant date fair value of such awards. Compensation cost is recognized over the performance period based on management's estimate of the number of units expected to vest and is adjusted to reflect the actual number of shares paid out at the end of the three-year performance period. Beginning with awards granted on or after February 23, 2009, dividend equivalents are not paid out unless and until such time that the award vests.

A summary of the status of the Company's restricted stock units and performance stock units as of December 31, 2012 and changes during the period then ended is presented below:

	Restricted Stock Units				Performance Stock Units
	Shares		Weighted Average Grant Date Fair Value		Shares		Weighted Average Grant Date Fair Value
Non-vested balance at January 1, 2012	15,058,428		$	25.43	368,346		$	30.60
Granted	2,797,287		$	31.96	461,756		$	31.89
Vested	(8,209,388	)	$	23.97	(25,129	)	$	30.83
Forfeited	(682,089	)	$	28.49	(81,075	)	$	31.31
Adjustment due to performance	—		$	—	6,940		$	30.60
Non-vested balance at December 31, 2012	8,964,238		$	28.58	730,838		$	31.32

The weighted-average grant-date fair value of the Company's restricted stock units and performance stock units granted during the year ended December 31, 2011 was $30.46 and $30.60, respectively; the combined weighted-average grant-date fair value of the Company's restricted stock units and performance stock units granted during the year ended December 31, 2010 was $22.81. The total fair value of the shares distributed during the years ended December 31, 2012, 2011 and 2010 in connection with the Company's restricted stock units and performance stock units was $262.6 million, $249 million and $170.7 million, respectively.

The number of vested performance stock units includes any applicable performance adjustment shares. The adjustment due to performance reflects the incremental portion of the above-target payout (160%) of performance stock units awarded in February 2011 that vested during 2012 either in full or on a pro-rata basis due to certain types of termination of employment. There is no adjustment due to performance for performance stock units awarded in February 2012 that vested during 2012 due to certain types of termination of employment within the calendar year of grant since the payout of such awards is at 100% of target under the award's terms and conditions.

Restricted Stock: Restricted shares of the Company's common stock may be awarded under the 2011 Plan and are subject to restrictions on transferability and other restrictions, if any, as the Compensation Committee may impose. The Compensation Committee may also determine when and under what circumstances the restrictions may lapse and whether the participant receives the rights of a stockholder, including, without limitation, the right to vote and receive dividends. Unless the Compensation Committee determines otherwise, restricted stock that is still subject to restrictions is forfeited upon termination of employment. Shares granted, generally become unrestricted at the earlier of: (1) January 1 of the year following the vesting grant date anniversary or (2) the later of the recipient's normal or actual retirement date. For shares granted prior to 2004, the vesting grant date anniversary is ten years. For shares granted during 2004 and 2005, the vesting grant date anniversary is 7 years and 5 years, respectively. However, certain restricted shares granted in 2005 vested on the third anniversary of the grant date. There have been no restricted shares granted since 2005.

A summary of the status of the Company's restricted stock awards as of December 31, 2012 and changes during the period then ended is presented below:

	Shares		Weighted Average Grant Date Fair Value
Non-vested balance at January 1, 2012	51,700		$	46.86
Granted	—		$	—
Vested	(20,000	)	$	46.14
Forfeited	—		$	—
Non-vested balance at December 31, 2012	31,700		$	47.31

The total fair value of the Company's restricted stock distributed was $0.6 million for each of the years ended December 31, 2012 and December 31, 2011. There were no restricted stock distributions in 2010.

As of December 31, 2012, there was $135 million of unrecognized compensation cost related to the Company's restricted stock, restricted stock units and performance stock unit awards. The weighted-average period over which that cost is expected to be recognized is approximately 1 year.

Marsh & McLennan Companies Stock Purchase Plans

In May 1999, the Company's stockholders approved an employee stock purchase plan (the “1999 Plan”) to replace the 1994 Employee Stock Purchase Plan (the “1994 Plan”), which terminated on September 30, 1999 following its fifth annual offering. Under the current terms of the Plan, shares are purchased four times during the plan year at a price that is 95% of the average market price on each quarterly purchase date. Under the 1999 Plan, after including the available remaining unused shares in the 1994 Plan and reducing the shares available by 10,000,000 consistent with the Company's Board of Directors' action in March 2007, no more than 35,600,000 shares of the Company's common stock may be sold. Employees purchased 899,424 shares during the year ended December 31, 2012 and at December 31, 2012, 4,136,312 shares were available for issuance under the 1999 Plan. Under the 1995 Company Stock Purchase Plan for International Employees (the “International Plan”), after reflecting the additional 5,000,000 shares of common stock for issuance approved by the Company's Board of Directors in July 2002, and the addition of 4,000,000 shares due to a shareholder action in May 2007, no more than 12,000,000 shares of the Company's common stock may be sold. Employees purchased 111,073 shares during the year ended December 31, 2012 and there were 3,085,961 shares available for issuance at December 31, 2012 under the International Plan. The plans are considered non-compensatory.

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Debt Debt (Estimated Fair Value Of Significant Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt [Abstract]
Short-term debt, carrying amount	$ 260	$ 260
Short-term debt, fair value	261	261
Long-term debt	2,658	2,668
Long-term debt, fair value	$ 2,986	$ 2,958

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Debt (Gain Or Loss On The Hedged Item And Offsetting Gain Or Loss On Interest Rate Swaps) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Operating expenses	$ (2,961,000,000)	$ (2,919,000,000)	$ (3,146,000,000)
Derivative Instruments, Gain (Loss) Recognized in Income, Net	0	0
Gain On Swaps [Member]
Other Operating expenses	(1,000,000)	(7,000,000)
Loss On Notes [Member]
Other Operating expenses	$ 1,000,000	$ 7,000,000

XML

Document and Entity Information	12 Months Ended
	Dec. 31, 2012
Document And Entity Information [Abstract]
Document Type	8-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Trading Symbol	MMC
Entity Registrant Name	MARSH & MCLENNAN COMPANIES, INC.
Entity Central Index Key	0000062709
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer

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Fair Value Measurements

12 Months Ended

Dec. 31, 2012

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 in ASC Topic No. 820 (“Fair Value Measurements and Disclosures”). 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, most U.S. Government and agency securities, money market mutual funds and certain other sovereign government obligations).

Assets and liabilities utilizing Level 1 inputs include exchange traded equity securities and mutual funds.

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

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

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

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

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

Assets and liabilities utilizing Level 2 inputs include corporate and municipal bonds, senior notes and interest rate swaps.

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 (examples include private equity investments, certain commercial mortgage whole loans, and long-dated or complex derivatives including certain foreign exchange options and long-dated options on gas and power).

Liabilities utilizing Level 3 inputs include liabilities for contingent purchase consideration.

Valuation Techniques

Equity Securities & Mutual Funds - Level 1

Investments for which market quotations are readily available are valued at the sale price on their principal exchange, or official closing bid price for certain markets. If no sales are reported, the security is valued at its last reported bid price.

Other Sovereign Government Obligations, Municipal Bonds and Corporate Bonds - Level 2

The investments listed in the caption above are valued on the basis of valuations furnished by an independent pricing service approved by the trustees or dealers. Such services or dealers determine valuations for normal institutional-size trading units of such securities using methods based on market transactions for comparable securities and various relationships, generally recognized by institutional traders, between securities.

Interest Rate Swap Derivative - Level 2

The fair value of interest rate swap derivatives is based on the present value of future cash flows at each valuation date resulting from utilization of the swaps, using a constant discount rate of 1.6% compared to discount rates based on projected future yield curves (See Note 12).

Senior Notes due 2014 - Level 2

The fair value of the first $250 million of Senior Notes maturing in 2014 is estimated to be the carrying value of those notes adjusted by the fair value of the interest rate swap derivative, discussed above. In the first quarter of 2011, the Company entered into two interest rate swaps to convert interest on a portion of its Senior Notes from a fixed rate to a floating rate. The swaps are designated as fair value hedging instruments. The change in the fair value of the swaps is recorded on the balance sheet. The carrying value of the debt related to these swaps is adjusted by an equal amount (See Note 12).

Contingent Purchase Consideration Liability - Level 3

Purchase consideration for some acquisitions made by the Company includes contingent consideration arrangements. Contingent consideration arrangements are primarily based on meeting EBITDA and revenue targets over periods from two to four years. The fair value of contingent consideration is estimated as the present value of future cash flows that would result from the projected revenue and earnings 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 December 31, 2012 and 2011.

(In millions of dollars)	Identical Assets (Level 1)				Observable Inputs (Level 2)				Unobservable Inputs (Level 3)				Total
	12/31/12		12/31/11		12/31/12		12/31/11		12/31/12		12/31/11		12/31/12		12/31/11
Assets:
Financial instruments owned:
Mutual funds(a)	$	139	$	134	$	—	$	—	$	—	$	—	$	139	$	134
Money market funds(b)	483		226		—		—		—		—		483		226
Interest rate swap derivatives(c)	—		—		6		7		—		—		6		7
Total assets measured at fair value	$	622	$	360	$	6	$	7	$	—	$	—	$	628	$	367
Fiduciary Assets:
State and local obligations (including non-U.S. locales)	$	—	$	—	$	3	$	13	$	—	$	—	$	3	$	13
Other sovereign government obligations and supranational agencies	—		—		—		47		—		—		—		47
Corporate and other debt	—		—		—		2		—		—		—		2
Money market funds	149		186		—		—		—		—		149		186
Total fiduciary assets measured at fair value	$	149	$	186	$	3	$	62	$	—	$	—	$	152	$	248
Liabilities:
Contingent purchase consideration liability(d)	$	—	$	—	$	—	$	—	$	63	$	110	$	63	$	110
Senior Notes due 2014(e)	$	—	$	—	$	256	$	257	$	—	$	—	$	256	$	257
Total liabilities measured at fair value	$	—	$	—	$	256	$	257	$	63	$	110	$	319	$	367

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

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

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

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

(e) Included in long term debt in the consolidated balance sheets.

During the year ended December 31, 2012, there were no assets or liabilities that transferred between Level 1 and Level 2 or between Level 2 and Level 3.

The table below sets forth a summary of the changes in fair value of the Company’s Level 3 liabilities for the years ended December 31, 2012 and December 31, 2011 that represent contingent purchase consideration related to acquisitions:

(In millions of dollars)	2012			2011
Balance at January 1,	$	110		$	106
Additions	27			14
Payments	(30		)	(13		)
Revaluation Impact	(44		)	3
Balance at December 31,	$	63		$	110

The fair value of the contingent purchase consideration liability is based on projections of revenue and earnings for the acquired entities that are 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 purchase consideration liability, the Company recorded a net reduction in the estimated fair value of such liabilities for acquisitions made in prior periods of $44 million for the year ended December 31, 2012. A 5% increase in the above mentioned projections would increase the liability by approximately $30 million. A 5% decrease in the above mentioned projections would decrease the liability by approximately $20 million.

Fair Value of Long-term Investments

The Company has certain long-term investments, primarily related to investments in non-publicly traded private equity funds of $16 million and $38 million at December 31, 2012 and December 31, 2011, respectively, carried on the cost basis for which there are no readily available market prices. The carrying values of these investments approximates fair value. Management's estimate of the fair value of these non-publicly traded investments is based on valuation methodologies including estimates from private equity managers of the fair value of underlying investments in private equity funds. The ability to accurately predict future cash flows, revenue or earnings may impact the determination of fair value. The Company monitors these investments for impairment and makes appropriate reductions in carrying values when necessary. These investments would be classified as Level 3 in the fair value hierarchy and are included in Other assets in the consolidated balance sheets. The Company also has investments in publicly traded mutual funds of $19 million and $20 million at December 31, 2012 and December 31, 2011, related to voluntary deferred contribution plans. These investments are classified as Level 1 in the fair value hierarchy and are included in Other assets in the consolidated balance sheets.

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Stock Benefit Plans (The Status Of Stock Option Awards) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Stock Benefit Plans [Abstract]
Number of options outstanding at January 1, 2012	38,895,109
Number of Options Granted	3,547,733
Number of Options Exercised	(6,892,731)
Number of Options Canceled or exchanged	0
Number of Options Forfeited	(860,022)
Number of options Expired	(2,644,296)
Number of options outstanding at December, 31 2012	32,045,793	38,895,109
Options vested or expected to vest at December 31, 2012	32,004,297
Options exercisable at December 31, 2012	16,115,605
Weighted Average Exercise Price per option at January 1, 2012	$ 29.21
Weighted Average Exercise Price per option Granted	$ 31.88
Weighted Average Exercise Price per option Excercized	$ 26.01
Weighted Average Exercise Price per option Canceled or exchanged	$ 0
Weighted Average Exercise Price per Option Forfeited	$ 27.69
Weighted Average Exercise Price per Option Expired	$ 42.85
Weighted Average Exercise Price per option at December 31, 2012	$ 29.10	$ 29.21
Weighted Average Exercise Price per option expected to vest	$ 29.12
Weighted Average Exercise Price per option exercisable at closing	$ 28.85
Weighted Average Remaining Contractual Term at closing, years		4 years 6 months
Weighted Average Remaining Contractual Term expected to vest, years	4 years 4 months 24 days
Weighted Average Remaining Contractual Term exercisable at closing, years	3 years 9 months 18 days
Aggregate Intrinsic Value at closing	$ 186,467
Aggregate Intrinsic Value expected to vest	185,871
Aggregare Intrinsic Value execisable at closing	$ 106,606

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Debt (Schedule Of Outstanding Debt) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Current portion of long-term debt	$ 260		$ 260
Long-term Debt and Capital Lease Obligations	2,658		2,668
Long-term debt, current and noncurrent	2,918		2,928
Senior Debt Obligations Due 2012 [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	0		250
Senior Debt Obligations Due 2013 [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	250		251
Senior Debt Obligations Due 2033 [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	296		296
Senior Debt Obligations Due 2014 [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	326		326
Senior Debt Obligations Due 2015 [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	479		479
Senior Debt Obligations Due 2019 [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	398		398
Senior Debt Obligations Due 2021 [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	497		496
Mortgage Due 2035 [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	422		431
Other [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	1		1
Senior Debt Obligations Due 2017 [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	$ 249		$ 0
Debt instrument, interest rate, stated percentage		2.30%

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Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 2,301	$ 2,113
Receivables
Commissions and fees	2,858	2,676
Advanced premiums and claims	62	86
Other	244	249
Gross receivables	3,164	3,011
Less-allowance for doubtful accounts and cancellations	(106)	(105)
Net receivables	3,058	2,906
Current deferred tax assets	410	376
Other current assets	194	253
Total current assets	5,963	5,648
Goodwill and intangible assets	7,261	6,963
Fixed assets, net	809	804
Pension related assets	260	39
Deferred tax assets	1,223	1,205
Other assets	772	795
Total assets	16,288	15,454
Current liabilities:
Short-term debt	260	260
Accounts payable and accrued liabilities	1,721	2,016
Accrued compensation and employee benefits	1,473	1,400
Accrued income taxes	110	63
Total current liabilities	3,564	3,739
Fiduciary liabilities	3,992	4,082
Less – cash and investments held in a fiduciary capacity	(3,992)	(4,082)
Net fiduciary assets	0	0
Long-term debt	2,658	2,668
Pension, postretirement and postemployment benefits	2,094	1,655
Liabilities for errors and omissions	460	468
Other liabilities	906	984
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 December 31, 2012 and December 31, 2011	561	561
Additional paid-in capital	1,107	1,156
Retained earnings	8,628	7,949
Accumulated other comprehensive loss	(3,307)	(3,188)
Non-controlling interests	64	57
Stockholders Equity Subtotal Before Treasury Stock	7,053	6,535
Less – treasury shares, at cost, 15,133,774 shares at December 31, 2012 and 21,463,226 shares at December 31, 2011	(447)	(595)
Total equity	6,606	5,940
Total liabilities and stockholders' equity	$ 16,288	$ 15,454

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Acquisitions

12 Months Ended

Dec. 31, 2012

Acquisitions [Abstract]

Acquisitions

Acquisitions

The Company’s acquisitions have been accounted for as purchases. Net assets and results of operations are included in the Company’s consolidated financial statements commencing at the respective effective purchase dates. In connection with acquisitions, the Company records the estimated value of the net tangible assets purchased and the value of the identifiable intangible assets purchased, which typically consist of purchased customer lists, trademarks and non-compete agreements. The valuation of purchased intangible assets involves significant estimates and assumptions. Any change in assumptions could affect the carrying value of such intangible assets.

During 2012, Marsh completed the following twelve acquisitions:

• January - Marsh acquired Alexander Forbes' South African brokerage operations, including Alexander Forbes Risk Services and related ancillary operations and insurance broking operations in Botswana and Namibia to expand Marsh's presence in Africa. Marsh subsequently closed the acquisitions of the Alexander Forbes operations in Uganda, Malawi and Zambia.

• March - Marsh & McLennan Agency business ("MMA") acquired KSPH, LLC, a middle-market employee benefits agency based in Virginia, and Marsh acquired Cosmos Services (America) Inc., the U.S. insurance brokerage subsidiary of ITOCHU Corp., which specializes in commercial property/casualty, personal lines, and employee benefits brokerage services to U.S. subsidiaries of Japanese companies.

• June - MMA acquired Progressive Benefits Solutions, an employee benefits agency based in North Carolina, and Security Insurance Services, Inc., a Wisconsin-based insurance agency which offers property/casualty and employee benefits products and services to individuals and businesses.

• August - MMA acquired Rosenfeld-Einstein, a South Carolina-based employee benefits service provider, and Eidson Insurance, a property/casualty and employee benefits services firm located in Florida.

• October - MMA acquired Howalt+McDowell, a South Dakota-based agency which offers property casualty, surety, personal protection and employee benefits insurance to individuals and businesses, and The Protector Group Insurance Agency, a Massachusetts-based agency which provides property casualty, employee benefits services, personal insurance and individual financial services.

• November - MMA acquired Brower Insurance, an Ohio-based company providing employee benefits, property/casualty and consulting services.

• December - MMA acquired McGraw Wentworth, a Michigan-based company providing consulting services to mid-sized organizations, and Liscomb Hood Mason, a Minnesota-based company providing property/casualty and employee benefits products and services.

The MMA acquisitions were made to expand Marsh's presence in the U.S. middle-market business.

During 2012, Mercer completed the following three acquisitions:

• February - Mercer acquired the remaining 49% of Yokogawa-ORC, a global mobility firm based in Japan, which was previously accounted for under the equity method, and Pensjon & Finans, a leading Norway-based financial investment and pension consulting firm.

• March - Mercer acquired REPCA, a France-based broking and advisory firm for employer health and benefits plans.

Total purchase consideration for acquisitions made during 2012 was $360 million, which consisted of cash paid of $252 million, deferred purchase and estimated contingent consideration of $46 million, and cash held in escrow of $62 million at December 31, 2011 that was released in the first quarter of 2012. Contingent consideration arrangements are primarily based on EBITDA and revenue targets over two to four years. The fair value of the contingent consideration was based on projected revenue and earnings of the acquired entities. Estimated fair values of assets acquired and liabilities assumed are subject to adjustment when purchase accounting is finalized. During 2012, the Company also paid $59 million of deferred purchase consideration and $30 million of contingent consideration related to acquisitions made in prior years. In addition, the Company paid $3 million to purchase other intangible assets during 2012.

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

(In millions)	2012
Cash (includes $62 million held in escrow at December 31, 2011)	$	314
Estimated fair value of deferred/contingent consideration	46
Total Consideration	$	360
Allocation of purchase price:
Cash and cash equivalents	$	22
Accounts receivable, net	8
Other current assets	—
Property, plant, and equipment	5
Intangible assets (primarily customer lists amortized over 10 years)	147
Goodwill	226
Other assets	5
Total assets acquired	413
Current liabilities	13
Other liabilities	40
Total liabilities assumed	53
Net assets acquired	$	360

Prior Year Acquisitions

During 2011, the Company made seven acquisitions in its Risk and Insurance Services segment and five in its Consulting segment. In January 2011, Marsh acquired RJF Agencies, Inc., an independent insurance broking firm in the Midwest. In February 2011, Marsh acquired Hampton Roads Bonding, a surety bonding agency for commercial, road, utility, maritime and government contractors in the state of Virginia, and the Boston office of Kinloch Consulting Group, Inc. In July 2011, Marsh acquired Prescott Pailet Benefits, an employee benefits broker in the state of Texas. In October 2011, Marsh acquired the employee benefits division of Kaeding, Ernst & Co, a Massachusetts-based employee benefits, life insurance and financial planning consulting firm. In November 2011, Marsh acquired Gallagher & Associates, Inc., a property and casualty insurance agency based in Minnesota. In November 2011, Marsh acquired Seitlin Insurance, an insurance firm based in South Florida. These acquisitions were made to expand Marsh’s share in the middle-market through Marsh & McLennan Agency.

In January 2011, Mercer acquired Hammond Associates, an investment consulting company for endowments and foundations in the U.S. In June 2011, Mercer acquired Evaluation Associates LLC, an investment consulting firm. In July 2011, Mercer acquired Mahoney Associates, a health and benefits advisory firm based in South Florida. In August 2011, Mercer acquired Censeo Corporation, a human resource consulting firm based in Florida. In December 2011, Mercer acquired Alicia Smith & Associates, a Medicaid policy consulting firm based in Washington, D.C.

Total purchase consideration for the 2011 acquisitions was $197 million which consisted of cash paid of $164 million and deferred and estimated contingent consideration of $33 million. Contingent consideration arrangements are primarily based on EBITDA and revenue targets over two to four years. The fair value of the contingent consideration was based on projected revenue and earnings 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 $27 million of deferred purchase and contingent consideration related to acquisitions made in prior years. In addition, the Company paid $4 million to purchase other intangible assets during 2011.

In the second quarter of 2011, Marsh acquired the remaining minority interest of a previously majority owned entity for total purchase consideration of $8 million and accounted for this acquisition under the accounting guidance for consolidations and non-controlling interests. This guidance requires that changes in a parent’s ownership interest while retaining financial controlling interest in a subsidiary be accounted for as an equity transaction. Stepping up the acquired assets to fair value or the recording of goodwill is not permitted. Therefore, the Company recorded a decrease to additional paid-in capital in 2011 of $2 million related to this transaction.

In the first quarter of 2011, the Company paid deferred purchase consideration of $13 million related to the purchase in 2009 of the minority interest of a previously controlled entity.

Pro-Forma Information

While the Company does not believe its acquisitions are material in the aggregate, the following unaudited pro-forma financial data gives effect to the acquisitions made by the Company during 2012 and 2011. 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, 2011 and reflects acquisitions made in 2011 as if they occured on January 1, 2010. The 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.

	Years Ended December 31,
(In millions, except per share data)	2012		2011		2010
Revenue	$	12,013	$	11,778	$	10,839
Income from continuing operations	$	1,214	$	990	$	580
Net income attributable to the Company	$	1,187	$	1,001	$	870
Basic net income per share:
– Continuing operations	$	2.18	$	1.78	$	1.03
– Net income attributable to the Company	$	2.18	$	1.84	$	1.59
Diluted net income per share:
– Continuing operations	$	2.15	$	1.75	$	1.02
– Net income attributable to the Company	$	2.14	$	1.81	$	1.57

The consolidated statements of income for 2012 include approximately $113 million of revenue and $21 million of net operating income, respectively, related to acquisitions made during 2012.

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Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2012

Other Comprehensive Income (Loss) [Abstract]

Other Comprehensive Income (Loss)

Other Comprehensive Income (Loss)

The components of other comprehensive income (loss) for the years ended December 31, 2012, 2011 and 2010 are as follows:

For the year ended December 31,	2012
(In millions of dollars)	Pre-Tax			Tax (Credit)			Net of Tax
Foreign currency translation adjustments	$	177		$	(5	)	$	182
Unrealized investment gains (losses)	(1		)	1			(2		)
Pension/post-retirement plans:
Amortization of losses (gains) included in net periodic pension cost:
Prior service gains	(31		)	(12		)	(19		)
Net actuarial losses	270			90			180
Subtotal	239			78			161
Net loss arising during period	(648		)	(217		)	(431		)
Foreign currency translation adjustments	(113		)	(26		)	(87		)
Other adjustments	75			17			58
Pension/post-retirement plans losses	(447		)	(148		)	(299		)
Other comprehensive loss	$	(271	)	$	(152	)	$	(119	)

For the year ended December 31,	2011
(In millions of dollars)	Pre-Tax			Tax (Credit)			Net of Tax
Foreign currency translation adjustments	$	(100	)	$	4		$	(104	)
Unrealized investment losses	(9		)	(4		)	(5		)
Pension/post-retirement plans:
Amortization of losses (gains) included in net periodic pension cost:
Prior service gains	(32		)	(13		)	(19		)
Net actuarial losses	213			68			145
Subtotal	181			55			126
Net loss arising during period	(1,289		)	(388		)	(901		)
Foreign currency translation adjustments	(14		)	(3		)	(11		)
Other adjustments	8			1			7
Pension/post-retirement plans losses	(1,114		)	(335		)	(779		)
Other comprehensive loss	$	(1,223	)	$	(335	)	$	(888	)

For the year ended December 31,	2010
(In millions of dollars)	Pre-Tax			Tax (Credit)			Net of Tax
Foreign currency translation adjustments	$	(34	)	$	(7	)	$	(27	)
Unrealized investment losses	(17		)	(5		)	(12		)
Pension/post-retirement plans:
Amortization of losses (gains) included in net periodic pension cost:
Prior service gains	(34		)	(13		)	(21		)
Net actuarial losses	144			48			96
Subtotal	110			35			75
Net loss arising during period	(346		)	(111		)	(235		)
Foreign currency translation adjustments	89			18			71
Other adjustments	1			2			(1		)
Pension/post-retirement plans losses	(146		)	(56		)	(90		)
Other comprehensive loss	$	(197	)	$	(68	)	$	(129	)

The components of accumulated other comprehensive income (loss) are as follows:

(In millions of dollars)	December 31, 2012			December 31, 2011
Foreign currency translation adjustments (net of deferred tax liability of $9 and $14 in 2012 and 2011, respectively)	$	140		$	(42	)
Net unrealized investment gains (net of deferred tax liability of $2 and $1 in 2012 and 2011, respectively)	4			6
Net charges related to pension / post-retirement plans (net of deferred tax asset of $1,657 and $1,508 in 2012 and 2011, respectively)	(3,451		)	(3,152		)
	$	(3,307	)	$	(3,188	)

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Claims, Lawsuits And Other Contingencies

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

Claims, Lawsuits And Other Contingencies

Claims, Lawsuits and Other Contingencies

Errors and Omissions Claims

The Company and its subsidiaries, particularly Marsh and Mercer, 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, and the provision of consulting services relating to the drafting and interpretation of trust deeds and other documentation governing pension plans. Certain of these claims, particularly in the U.S. and the U.K., seek damages, including punitive and treble damages, in amounts that could, if awarded, be significant. In establishing liabilities for errors and omissions claims in accordance with FASB ASC Subtopic No.450-20 (Contingencies-Loss Contingencies), the Company utilizes case level reviews by inside and outside counsel and an internal actuarial analysis 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 Related Claims

In January 2005, the Company and its subsidiary Marsh Inc. entered into a settlement agreement with the New York State Attorney General (“NYAG”) and the New York State Insurance Department to settle a civil complaint and related citation regarding Marsh's use of market service agreements with various insurance companies. The parties subsequently entered into an amended and restated settlement agreement in February 2010 that restored a level playing field for Marsh.

Numerous private party lawsuits based on similar allegations to those made in the NYAG complaint were commenced against the Company, one or more of its subsidiaries, and their current and former directors and officers. Most of these matters have been resolved. Four actions instituted by policyholders against the Company, Marsh and certain Marsh subsidiaries remain pending in federal court.

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 we operate. In the ordinary course of business we are also subject to investigations, lawsuits and/or 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 we sold in 2001. Sedgwick guaranteed payment of claims on certain policies underwritten through the Institute of London Underwriters (the “ILU”) by River Thames. The policies covered by this guarantee are 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 December 31, 2012, 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 us 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 July3, 1980 and October6, 1983. Certain claims have been paid under the letter of credit and we anticipate that additional claimants may seek to recover against the letter of credit.

Kroll-related Matters

Under the terms of a stock purchase agreement with Altegrity, Inc. (“Altegrity”) related to Altegrity's purchase of Kroll from the Company in August 2010, a copy of which is attached as an exhibit to the Company's Quarterly Report on Form 10-Q for the period ended June30, 2010, we agreed to provide a limited indemnity to Altegrity with respect to certain Kroll-related litigation and regulatory matters.

**********

The pending proceedings and other matters described in this Note 15 on Claims, Lawsuits and Other Contingencies may expose the Company or its subsidiaries to liability for significant monetary damages and other forms of relief. Where a loss is both probable and reasonably estimable, we establish liabilities in accordance with FASB ASC Subtopic No.450-20 (Contingencies-Loss Contingencies). Except as described above, we are 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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Long-Term Commitments

12 Months Ended

Dec. 31, 2012

Long-Term Commitments [Abstract]

Long-Term Commitments

Long-term Commitments

The Company leases office facilities, equipment and automobiles under non-cancelable operating leases. These leases expire on varying dates; in some instances contain renewal and expansion options; do not restrict the payment of dividends or the incurrence of debt or additional lease obligations; and contain no significant purchase options. In addition to the base rental costs, occupancy lease agreements generally provide for rent escalations resulting from increased assessments for real estate taxes and other charges. Approximately 98% of the Company’s lease obligations are for the use of office space.

The consolidated statements of income include net rental costs of $416 million, $430 million and $421 million for 2012, 2011 and 2010, respectively, after deducting rentals from subleases ($10 million in 2012, $9 million in 2011 and $8 million in 2010). These net rental costs exclude rental costs and sublease income for previously accrued restructuring charges related to vacated space.

At December 31, 2012, the aggregate future minimum rental commitments under all non-cancelable operating lease agreements are as follows:

For the Years Ended December 31,	Gross Rental Commitments		Rentals from Subleases		Net Rental Commitments
(In millions of dollars)
2013	$	404	$	49	$	355
2014	$	359	$	48	$	311
2015	$	315	$	43	$	272
2016	$	279	$	42	$	237
2017	$	236	$	40	$	196
Subsequent years	$	1,227	$	109	$	1,118

The Company has entered into agreements, primarily with various service companies, to outsource certain information systems activities and responsibilities and processing activities. Under these agreements, the Company is required to pay minimum annual service charges. Additional fees may be payable depending upon the volume of transactions processed, with all future payments subject to increases for inflation. At December 31, 2012, the aggregate fixed future minimum commitments under these agreements are as follows:

For the Years Ended December 31,	Future Minimum Commitments
(In millions of dollars)
2013	$	168
2014	87
2015	48
Subsequent years	118
	$	421

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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Mutual funds	$ 139	[1]	$ 134	[1]
Money market funds	483	[2]	226	[2]
Interest rate swap derivatives	6	[3]	7
Total assets measured at fair value	628		367
State and local obligations (including non-U.S. locales)	3		13
Other sovereign government obligations and supranational agencies			47
Corporate and other debt			2
Money market funds	149		186
Total fiduciary assets measured at fair value	152		248
Contingent consideration liability	63	[4]	110	[4]	106
Senior Notes due 2014	256	[5]	257
Total liabilities measured at fair value	319		367
Identical Assets (Level 1) [Member]
Mutual funds	139	[1]	134	[1]
Money market funds	483	[2]	226	[2]
Total assets measured at fair value	622		360
Money market funds	149		186
Total fiduciary assets measured at fair value	149		186
Observable Inputs (Level 2) [Member]
Interest rate swap derivatives	6	[3]	7	[3]
Total assets measured at fair value	6		7
State and local obligations (including non-U.S. locales)	3		13
Other sovereign government obligations and supranational agencies			47
Corporate and other debt			2
Total fiduciary assets measured at fair value	3		62
Senior Notes due 2014	256	[5]	257
Total liabilities measured at fair value	256		257
Unobservable Inputs (Level 3) [Member]
Contingent consideration liability	63	[4]	110	[4]
Total liabilities measured at fair value	$ 63		$ 110

[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 other receivables in the consolidated balance sheets.

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

[5] Included in long term debt in the consolidated balance sheets.

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Income Taxes

12 Months Ended

Dec. 31, 2012

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

For financial reporting purposes, income before income taxes includes the following components: 

For the Years Ended December 31,
(In millions of dollars)	2012			2011		2010
Income before income taxes:
U.S.	$	398		$	121	$	(296	)
Other	1,298			1,283		1,065
	$	1,696		$	1,404	$	769
The expense (benefit) for income taxes is comprised of:
Income taxes:
Current–
U.S. Federal	$	42		$	7	$	(90	)
Other national governments	336			289		249
U.S. state and local	24			24		21
	402			320		180
Deferred–
U.S. Federal	(18		)	5		(28		)
Other national governments	89			90		50
U.S. state and local	19			7		2
	90			102		24
Total income taxes	$	492		$	422	$	204

The significant components of deferred income tax assets and liabilities and their balance sheet classifications are as follows:  

December 31,
(In millions of dollars)	2012		2011
Deferred tax assets:
Accrued expenses not currently deductible	$	589	$	559
Differences related to non-U.S. operations (a)	159		188
Accrued retirement & postretirement benefits—non-U.S. operations	107		164
Accrued retirement benefits U.S.	604		507
Net operating losses (b)	104		129
Income currently recognized for tax	75		62
Foreign tax credit carryforwards	224		169
Other	77		114
	$	1,939	$	1,892

Deferred tax liabilities:
Unrealized investment holding gains	$	2	$	3
Differences related to non-U.S. operations	107		99
Depreciation and amortization	245		233
Other	4		9
	$	358	$	344

(a) Net of valuation allowances of $7 million in 2012 and $3 millionin 2011.

(b) Net of valuation allowances of $65 million in 2012 and $46 million in 2011.

December 31,
(In millions of dollars)	2012			2011
Balance sheet classifications:
Current assets	$	410		$	376
Other assets	$	1,223		$	1,205
Current liabilities	$	(18	)	$	(12	)
Other liabilities	$	(34	)	$	(21	)

U.S. Federal income taxes are not provided on temporary differences with respect to investments in foreign subsidiaries that are essentially permanent in duration, which at December 31, 2012 amounted to approximately $4.3 billion. The determination of the unrecognized deferred tax liability with respect to these investments is not practicable.

A reconciliation from the U.S. Federal statutory income tax rate to the Company’s effective income tax rate is shown below.

For the Years Ended December 31,	2012		2011		2010
U.S. Federal statutory rate	35.0	%	35.0	%	35.0	%
U.S. state and local income taxes—net of U.S. Federal income tax benefit	1.9		1.6		1.9
Differences related to non-U.S. operations	(6.1	)	(6.5	)	(9.5	)
Other	(1.8	)	—		(0.9	)
Effective tax rate	29.0	%	30.1	%	26.5	%

The Company’s consolidated tax rate was 29.0%, 30.1% and 26.5% in 2012, 2011 and 2010, respectively. The tax rate in each year reflects foreign operations, which are taxed at rates lower than the U.S. statutory tax rate.

Valuation allowances had net increases of $23 million and decreases of $1 million in 2012 and 2011, respectively. During the respective years, adjustments of the beginning of the year balances of valuation allowances increased income tax expense by $16 million in 2012 and decreased income tax expense by $7 million in 2011. None of the cumulative valuation allowances relate to amounts which if realized would increase contributed capital in the future. Approximately 73% of the Company’s net operating loss carryforwards expire from 2013 through 2032, and others are unlimited. The potential tax benefit from net operating loss carryforwards at the end of 2012 comprised state and local, and non-U.S. tax benefits of $78 million and $90 million, respectively, before reduction for valuation allowances. Foreign tax credit carryforwards expire from 2018 through 2022.

The realization of deferred tax assets depends on generating future taxable income in the applicable jurisdiction during the periods in which the tax benefits are deductible or creditable. The Company, including Marsh have been profitable globally. However, tax liabilities are determined and assessed on a legal entity and jurisdictional basis. Certain taxing jurisdictions allow or require combined or consolidated tax filings.

In the United States, certain groups within the Company, which file on a combined basis, were profitable in 2011 and 2012, but incurred a loss in 2010 as a result of the cost resulting from the resolution of the ARMB matter. The Company assessed the realizability of its domestic deferred tax assets, particularly state deferred tax assets of Marsh relating to jurisdictions in which it files separate tax returns, state deferred tax assets of all of the Company's domestic operations related to jurisdictions in which the Company files a unitary or combined state tax return, and foreign tax credit carryforwards in the Company's consolidated U.S. federal tax return. When making its assessment about the realization of its domestic deferred tax assets at December 31, 2012, the Company considered all available evidence, placing particular weight on evidence that could be objectively verified. The evidence considered included (i) the profitability of the Company's U.S. operations in 2011 and 2012 and the cumulative period from 2010 through 2012, (ii) the nature, frequency, and severity of financial reporting losses incurred prior to 2011, (iii) profit trends evidenced by continued improvements in the Company's and Marsh's operating performance, (iv) the non-recurring nature of some of the items that contributed to the losses before 2011, (v) the carryforward periods for the net operating losses ("NOLs") and foreign tax credit carryforwards, (vi) the sources and timing of future taxable income, giving weight to sources according to the extent to which they can be objectively verified, and (vii) tax planning strategies that would be implemented, if necessary, to accelerate utilization of NOLs. Based on its assessment, the Company concluded that it is more likely than not that a substantial portion of these deferred tax assets are realizable and a valuation allowance was recorded to reduce the domestic tax assets to the amount that the Company believes is more likely than not to be realized. In the event sufficient taxable income is not generated in future periods, additional valuation allowances of up to approximately $270 million could be required relating to these domestic deferred tax assets. The realization of the remaining U.S. federal deferred tax assets is not as sensitive to U.S. profits because it is supported by anticipated repatriation of future annual earnings from the Company’s profitable global operations, consistent with the Company's historical practice. In addition, when making its assessment about the realization of its domestic deferred tax assets at December 31, 2012, the Company continued to assess the realizability of deferred tax assets of certain other entities with a history of recent losses, including other U.S. entities that file separate state tax returns and foreign subsidiaries, and recorded valuation allowances as appropriate.

Following is a reconciliation of the Company’s total gross unrecognized tax benefits for the years ended December 31, 2012, 2011 and 2010:

(In millions of dollars)	2012			2011			2010
Balance at January 1,	$	143		$	199		$	206
Additions, based on tax positions related to current year	26			7			7
Additions for tax positions of prior years	35			39			10
Reductions for tax positions of prior years	(41		)	(91		)	(6		)
Reductions due to reclassification of tax indemnifications on sale of Kroll	—			—			(3		)
Settlements	(6		)	(6		)	(4		)
Lapses in statutes of limitation	(40		)	(5		)	(11		)
Balance at December 31,	$	117		$	143		$	199

Of the total unrecognized tax benefits at December 31, 2012, 2011 and 2010, $96 million, $102 million and $123 million, respectively, represent the amount that, if recognized, would favorably affect the effective tax rate in any future periods. The total gross amount of accrued interest and penalties at December 31, 2012 , 2011 and 2010, before any applicable federal benefit, was $13 million, $17 million and $35 million, respectively.

As discussed in Note 5, the Company has provided certain indemnities related to contingent tax liabilities as part of the disposals of Putnam and Kroll. At December 31, 2012, 2011 and 2010, $6 million, $14 million and $75 million, respectively, included in the table above, relates to Putnam and Kroll positions included in consolidated Company tax returns. Since the Company remains primarily liable to the taxing authorities for resolution of uncertain tax positions related to consolidated returns, these balances will remain as part of the Company’s consolidated liability for uncertain tax positions. Any future charges or credits that are directly related to the disposal of Putnam and Kroll and the indemnified contingent tax issues, including interest accrued, will be recorded in discontinued operations as incurred. The balance of gross unrecognized tax benefits at January 1, 2010 in the chart above includes balances related to stand alone tax filings of Kroll that were reclassified and are included as part of the fair value liability for contingent tax indemnities following the sale transaction.

The Company is routinely examined by the jurisdictions in which it has significant operations. The Internal Revenue Service (IRS) is currently examining 2009 and 2010.   During 2011, the Company was accepted to participate in the IRS Compliance Assurance Process (CAP) which is structured to conduct real-time compliance reviews.  The IRS is currently examining 2011 and performing a pre-filing review of the Company's 2012 U.S. operations. New York State has examinations underway for various entities covering the years 2007 through 2010. At the end of 2012, Massachusetts issued Notices of Assessment for 2007 for various entities and the Company is currently appealing those assessments. During 2012, the United Kingdom completed its examination of tax year 2010 for various subsidiaries. There are no ongoing tax audits in the jurisdictions outside the U.S. in which the company has significant operations. The Company regularly considers the likelihood of assessments in each of the taxing jurisdictions resulting from examinations. The Company has established appropriate liabilities for uncertain tax positions in relation to the potential assessments. The Company believes the resolution of tax matters will not have a material effect on the consolidated financial position of the Company, although a resolution of tax matters could have a material impact on the Company's net income or cash flows and on its effective tax rate in a particular future period. It is reasonably possible that the total amount of unrecognized tax benefits will decrease between zero and approximately $25 million within the next twelve months due to settlement of audits and expiration of statutes of limitation.

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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Goodwill And Other Intangibles [Abstract]
2013	$ 67
2014	64
2015	61
2016	50
2017	45
Subsequent years	182
Net Carrying Amount	$ 469	$ 401

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Discontinued Operations

12 Months Ended

Dec. 31, 2012

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

Discontinued Operations

As part of the disposal transactions for Putnam and Kroll, the Company provided certain indemnities, primarily related to pre-transaction tax uncertainties and legal contingencies. In accordance with applicable accounting guidance, liabilities were established related to these indemnities at the time of the sales and reflected as a reduction of the gain on disposal. Discontinued operations includes charges or credits resulting from the settlement or resolution of the indemnified matters, as well as adjustments to the liabilities related to such matters. Discontinued operations in 2011 includes credits of$50 millionfrom the resolution of certain legal matters and insurance recoveries, as well as the settlement of tax audits and the expiration of the statutes of limitations related to certain of the indemnified matters, primarily with respect to Putnam.

Marsh's BPO business, previously part of the Marsh U.S. Consumer business, provided policy, claims, call center and accounting operations on an outsourced basis to life insurance carriers. Marsh invested in a technology platform that was designed to make the Marsh BPO business scalable and more efficient. During 2011, Marsh decided that it would cease investing in the technology platform and instead exit the business via a sale. In the fourth quarter of 2011, management initiated a plan to sell the Marsh BPO business, which was completed in August 2012. The Company wrote off capitalized software of $17 million, net of tax, which is included in discontinued operations in 2011.

In the first quarter of 2010, Kroll completed the sale of KLS and on August 3, 2010, the Company completed the sale of Kroll to Altegrity.

Kroll’s results of operations are reported as discontinued operations in the Company’s consolidated statement of income for the portion of 2010 prior to Kroll's disposal. The year ended 2010 also includes the gain on the sale of Kroll and related tax benefits and the loss on the sale of KLS, which includes the tax provision of $36 million on the sale.

The Company’s tax basis in its investment in the stock of Kroll at the time of sale exceeded the recorded amount primarily as a result of prior impairments of goodwill recognized for financial reporting, but not tax. A $265 million deferred tax benefit was recorded in discontinued operations in 2010 as a result of the sale of Kroll.

Summarized Statements of Income data for discontinued operations is as follows:

For the Year Ended December 31,
(In millions of dollars)	2012			2011			2010
Kroll Operations
Revenue	$	—		$	—		$	381
Operating expenses	—			—			345
Operating income	—			—			36
Income tax expense	—			—			16
Income from Kroll operations, net of tax	—			—			20
Other discontinued operations, net of tax	—			(17		)	(7		)
Income (loss) from discontinued operations, net of tax	—			(17		)	13
Disposals of discontinued operations (a)	(2		)	25			58
Income tax (credit) expense (b)	1			(25		)	(235		)
Disposals of discontinued operations, net of tax	(3		)	50			293
Discontinued operations, net of tax	$	(3	)	$	33		$	306
Discontinued operations, net of tax per share
– Basic	$	—		$	0.06		$	0.55
– Diluted	$	—		$	0.06		$	0.55

(a) Includes gain on sale of Kroll and the gain on the sale of KLS in 2010.

(b) Includes the provision/(credit) for income taxes relating to the recognition of tax benefits recorded in connection with the sale of Kroll as well as a tax provision of $36 million on the sale of KLS in 2010.

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Goodwill And Other Intangibles

12 Months Ended

Dec. 31, 2012

Goodwill And Other Intangibles [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 test 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. The Company considered the numerous factors, which included that the fair value of each reporting unit exceeded its carrying value by a substantial margin in its most recent estimate of reporting unit fair values, whether significant acquisitions or dispositions occurred which might alter the fair values 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 evaluation in the third quarter of 2012 and concluded that a two-step goodwill impairment test was not required in 2012 and that goodwill was not impaired.

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.

Changes in the carrying amount of goodwill are as follows:

(In millions of dollars)	2012		2011
Balance as of January 1, as reported	$	6,562	$	6,420
Goodwill acquired	226		124
Other adjustments(a)	4		18
Balance at December 31,	$	6,792	$	6,562

(a) Reflects increases due to the impact of foreign exchange in both years. 2012 also reflects a reduction due to purchase accounting adjustments.

The goodwill acquired of $226 million in 2012 (approximately $110 million of which is deductible for tax purposes) comprised of $196 million related to the Risk and Insurance Services segment and $30 million related to the Consulting segment.

Goodwill allocable to the Company’s reportable segments is as follows: Risk and Insurance Services, $4.6 billion and Consulting, $2.2 billion.

Amortized intangible assets consist primarily of the cost of client lists and trade names acquired. The gross cost and accumulated amortization at December 31, 2012 and 2011 is as follows:

(In millions of dollars)	2012						2011
	Gross Cost		Accumulated Amortization		Net Carrying Amount		Gross Cost		Accumulated Amortization		Net Carrying Amount
Amortized intangibles	$	814	$	345	$	469	$	666	$	265	$	401

The Company recorded an intangible asset impairment charge of $8 million in the third quarter of 2012 in the Risk & Insurance Services segment.

Aggregate amortization expense for the years ended December 31, 2012, 2011 and 2010 was $72 million, $65 million and $50 million, respectively, and the estimated future aggregate amortization expense is as follows:

For the Years Ending December 31,
(In millions of dollars)
2013	$	67
2014	64
2015	61
2016	50
2017	45
Subsequent years	182
	$	469

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Retirement Benefits

12 Months Ended

Dec. 31, 2012

Retirement Benefits [Abstract]

Retirement Benefits

Retirement Benefits

The Company maintains qualified and non-qualified defined benefit pension plans for its U.S. and non-U.S. eligible employees. The Company’s policy for funding its tax qualified defined benefit retirement plans is to contribute amounts at least sufficient to meet the funding requirements set forth by U.S. law and the laws of the non-U.S. jurisdictions in which the Company offers defined benefit plans.

Combined U.S. and non-U.S. Plans

The weighted average actuarial assumptions utilized for the U.S. and significant non-U.S. defined benefit plans and postretirement benefit plans are as follows:

	Pension  Benefits				Postretirement Benefits
	2012		2011		2012		2011
Weighted average assumptions:
Discount rate (for expense)	4.91	%	5.59	%	5.05	%	5.81	%
Expected return on plan assets	8.03	%	8.19	%	—		—
Rate of compensation increase (for expense)	3.09	%	4.08	%	—		—
Discount rate (for benefit obligation)	4.38	%	4.91	%	4.32	%	5.05	%
Rate of compensation increase (for benefit obligation)	2.43	%	3.09	%	—		—

The Company uses actuaries from Mercer, a subsidiary of the Company, to perform valuations of its pension plans. The long-term rate of return assumption is determined for each plan based on the facts and circumstances that exist as of the measurement date, and the specific portfolio mix of each plan’s assets. The Company utilizes a model developed by the Mercer actuaries to assist in the determination of this assumption. The model takes into account several factors, including: actual and target portfolio allocation; investment, administrative and trading expenses incurred directly by the plan trust; historical portfolio performance; relevant forward-looking economic analysis; and expected returns, variances and correlations for different asset classes. These measures are used to determine probabilities using standard statistical techniques to calculate a range of expected returns on the portfolio. The Company generally does not adjust the rate of return assumption from year to year if, at the measurement date, it is within the best estimate range, defined as between the 25^thand 75^thpercentile of the expected long-term annual returns in accordance with the “American Academy of Actuaries Pension Practice Council Note May 2001 Selecting and Documenting Investment Return Assumptions” and consistent with Actuarial Standards of Practice No. 27. Historical long-term average asset returns of each plan are also reviewed to determine whether they are consistent and reasonable compared with the best estimate range. The expected return on plan assets is determined by applying the assumed long-term rate of return to the market-related value of plan assets. This market-related value recognizes investment gains or losses over a five-year period from the year in which they occur. Investment gains or losses for this purpose are the difference between the expected return calculated using the market-related value of assets and the actual return based on the market value of assets. Since the market-related value of assets recognizes gains or losses over a five-year period, the future market-related value of the assets will be impacted as previously deferred gains or losses are recorded.

The target asset allocation for the U.S. Plan is 58% equities and equity alternatives and 42% fixed income. At the end of 2012, the actual allocation for the U.S. Plan was 58% equities and equity alternatives and 42% fixed income. The target asset allocation for the U.K. Plan, which comprises approximately 82% of non-U.S. Plan assets, is 53% equities and equity alternatives and 47% fixed income. At the end of 2012, the actual allocation for the U.K. Plan was 52% equities and equity alternatives and 48% fixed income. 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 uses threshold-based portfolio rebalancing to ensure the actual portfolio remains consistent with target asset allocation ranges.

The discount rate selected for each U.S. plan is based on a model bond portfolio with coupons and redemptions that closely match the expected liability cash flows from the plan. Discount rates for non-U.S. plans are based on appropriate bond indices such as the Markit iBoxx £ Corporates AA 15+ index in the U.K. Projected compensation increases reflect current expectations as to future levels of inflation.

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

Combined U.S. and significant non-U.S. Plans	Pension									Postretirement
For the Years Ended December 31,	Benefits									Benefits
(In millions of dollars)	2012			2011			2010			2012			2011			2010
Service cost	$	240		$	226		$	197		$	5		$	5		$	4
Interest cost	596			609			578			13			13			14
Expected return on plan assets	(905		)	(887		)	(815		)	—			—			—
Amortization of prior service credit	(19		)	(19		)	(21		)	(14		)	(13		)	(13		)
Recognized actuarial loss (credit)	270			215			144			—			(4		)	—
Net periodic benefit cost	$	182		$	144		$	83		$	4		$	1		$	5

Plan Assets

For the U.S. plan, investment allocation decisions are made by a fiduciary committee composed of senior executives appointed by the Company’s Chief Executive Officer. For the non-U.S. plans, investment allocation decisions are made by local fiduciaries, in consultation with the Company for the larger plans. Plan assets are invested in a manner consistent with the fiduciary standards set forth in all relevant laws relating to pensions and trusts in each country. Primary investment objectives are (1) to achieve an investment return that, in combination with current and future contributions, will provide sufficient funds to pay benefits, and (2) to minimize the risk of large losses. The investment allocations are designed to meet these objectives by broadly diversifying plan assets among numerous asset classes with differing expected returns, volatilities, and correlations.

The major categories of plan assets include equity securities, equity alternative investments, and fixed income securities. For the U.S. qualified plan, the category ranges are 53-63% for equities and equity alternatives, and 37-47% for fixed income. For the U.K. Plan, the category ranges are 50-56% for equities and equity alternatives, and 44-50% for fixed income. Asset allocation ranges are evaluated generally every three years. Asset allocation is monitored frequently and re-balancing actions are taken as appropriate.

Plan investments are exposed to stock market, interest rate, and credit risk. Concentrations of these risks are generally limited due to diversification by investment style within each asset class, diversification by investment manager, diversification by industry sectors and issuers, and the dispersion of investments across many geographic areas.

Unrecognized Actuarial Gains/Losses

In accordance with applicable accounting guidance, the funded status of the Company's pension plans is recorded in the consolidated balance sheets and provides for a delayed recognition of actuarial gains or losses arising from changes in the projected benefit obligation due to changes in the assumed discount rates, differences between the actual and expected value of plan assets and other assumption changes. The unrecognized pension plan actuarial gains or losses and prior service costs not yet recognized in net periodic pension cost are recognized in AOCI, net of tax. These gains and losses are amortized prospectively out of AOCI over a period that approximates the average remaining service period of active employees, or for plans in which substantially all the participants are inactive, over the remaining life expectancy of the inactive employees.

U.S. Plans

The following schedules provide information concerning the Company’s U.S. defined benefit pension plans and postretirement benefit plans:

	U.S. Pension Benefits						U.S.  Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Change in benefit obligation:
Benefit obligation at beginning of year	$	4,533		$	4,041		$	162		$	180
Service cost	93			83			3			3
Interest cost	230			231			8			8
Actuarial (gain) loss	522			352			13			(20		)
Medicare Part D subsidy	—			—			3			4
Benefits paid	(181		)	(174		)	(13		)	(13		)
Benefit obligation, December 31	$	5,197		$	4,533		$	176		$	162
Change in plan assets:
Fair value of plan assets at beginning of year	$	3,493		$	3,444		$	—		$	—
Actual return on plan assets	500			199			—			—
Employer contributions	124			24			10			9
Medicare Part D subsidy	—			—			3			4
Benefits paid	(181		)	(174		)	(13		)	(13		)
Fair value of plan assets, December 31	$	3,936		$	3,493		$	—		$	—
Net funded status, December 31	$	(1,261	)	$	(1,040	)	$	(176	)	$	(162	)
Amounts recognized in the consolidated balance sheets:
Current liabilities	$	(25	)	$	(124	)	$	(9	)	$	(9	)
Noncurrent liabilities	(1,236		)	(916		)	(167		)	(153		)
Net liability recognized, December 31	$	(1,261	)	$	(1,040	)	$	(176	)	$	(162	)
Amounts recognized in other comprehensive income (loss):
Prior service credit	$	23		$	39		$	—		$	13
Net actuarial (loss) gain	(1,887		)	(1,695		)	(2		)	12
Total recognized accumulated other comprehensive (loss) income, December 31	$	(1,864	)	$	(1,656	)	$	(2	)	$	25
Cumulative employer contributions in excess (deficient) of net periodic cost	603			616			(174		)	(187		)
Net amount recognized in consolidated balance sheet	$	(1,261	)	$	(1,040	)	$	(176	)	$	(162	)
Accumulated benefit obligation at December 31	$	5,114		$	4,467		$	—		$	—

	U.S. Pension Benefits						U.S.  Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Reconciliation of prior service credit (charge) recognized in accumulated other comprehensive income (loss):
Beginning balance	$	39		$	55		$	13		$	26
Recognized as component of net periodic benefit credit	(16		)	(16		)	(13		)	(13		)
Prior service credit, December 31	$	23		$	39		$	—		$	13

	U.S. Pension Benefits						U.S.  Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Reconciliation of net actuarial gain (loss) recognized in accumulated other comprehensive income (loss):
Beginning balance	$	(1,695	)	$	(1,327	)	$	12		$	(4	)
Recognized as component of net periodic benefit cost	152			100			(1		)	(4		)
Changes in plan assets and benefit obligations recognized in other comprehensive income (loss):
Liability experience	(522		)	(352		)	(13		)	20
Asset experience	178			(116		)	—			—
Total gain (loss) recognized as change in plan assets and benefit obligations	(344		)	(468		)	(13		)	20
Net actuarial gain (loss), December 31	$	(1,887	)	$	(1,695	)	$	(2	)	$	12

For the Years Ended December 31,	U.S. Pension Benefits						U.S. Postretirement Benefits
(In millions of dollars)	2012		2011		2010		2012		2011			2010
Total recognized in net periodic benefit cost and other comprehensive loss (income)	$	346	$	467	$	148	$	24	$	(9	)	$	26

Estimated amounts that will be amortized from accumulated other comprehensive income in the next fiscal year:

	U.S. Pension Benefits			U.S. Postretirement Benefits
(In millions of dollars)	2013			2013
Prior service cost	$	(16	)	$	—
Net actuarial loss	202			—
Projected cost	$	186		$	—

The weighted average actuarial assumptions utilized in determining the above amounts for the U.S. defined benefit and other U.S. postretirement plans as of the end of the year are as follows:

	U.S. Pension Benefits				U.S. Postretirement Benefits
	2012		2011		2012		2011
Weighted average assumptions:
Discount rate (for expense)	5.15	%	5.90	%	5.10	%	5.95	%
Expected return on plan assets	8.75	%	8.75	%	—		—
Rate of compensation increase (for expense)	2.00	%	3.90	%	—		—
Discount rate (for benefit obligation)	4.45	%	5.15	%	4.25	%	5.10	%
Rate of compensation increase (for benefit obligation)	2.00	%	2.00	%	—		—

The projected benefit obligation, accumulated benefit obligation and aggregate fair value of plan assets for U.S. pension plans with accumulated benefit obligations in excess of plan assets were $5.2 billion, $5.1 billion and $3.9 billion, respectively, as of December 31, 2012 and $4.5 billion, $4.5 billion and $3.5 billion, respectively, as of December 31, 2011.

The projected benefit obligation and fair value of plan assets for U.S. pension plans with projected benefit obligations in excess of plan assets was $5.2 billion and $3.9 billion, respectively, as of December 31, 2012 and $4.5 billion and $3.5 billion, respectively, as of December 31, 2011.

As of December 31, 2012, the U.S. qualified plan holds eight million shares of the Company’s common stock which were contributed to the Plan by the Company in 2005. This represents approximately 7% of that plan’s assets as of December 31, 2012. In addition, plan assets may be invested in funds managed by Mercer Investments.

The components of the net periodic benefit cost for the U.S. defined benefit and other postretirement benefit plans are as follows:

U.S. Plans only	Pension Benefits									Postretirement Benefits
For the Years Ended December 31,
(In millions of dollars)	2012			2011			2010			2012			2011			2010
Service cost	$	93		$	83		$	76		$	3		$	3		$	3
Interest cost	230			231			227			8			8			10
Expected return on plan assets	(322		)	(315		)	(295		)	—			—			—
Amortization of prior service credit	(16		)	(16		)	(18		)	(13		)	(13		)	(13		)
Recognized actuarial loss (credit)	152			100			71			(1		)	(4		)	—
Net periodic benefit cost (credit)	$	137		$	83		$	61		$	(3	)	$	(6	)	$	—

In December 2003, the Medicare Prescription Drug, Improvement and Modernization Act of 2003 became law. The net periodic benefit cost shown above for 2012, 2011 and 2010, respectively, includes the subsidy.

The assumed health care cost trend rate for Medicare eligibles is approximately 7.86% in 2012, gradually declining to 4.5% in 2028, and the rate for non-Medicare eligibles is 7.73% in 2012, gradually declining to 4.50% in 2028. Assumed health care cost trend rates have a small effect on the amounts reported for the U.S. health care plans because the Company caps its share of health care trend at 5%. A one percentage point change in assumed health care cost trend rates would have the following effects:

(In millions of dollars)	1 Percentage Point Increase		1 Percentage Point Decrease
Effect on total of service and interest cost components	$	—	$	—
Effect on postretirement benefit obligation	$	1	$	(5	)

Estimated Future Contributions

The Company expects to fund approximately $25 million for its U.S. non-qualified plan in 2013. The Company’s policy for funding its tax-qualified defined benefit retirement plans is to contribute amounts at least sufficient to meet the funding requirements set forth in the U.S. and applicable foreign law. There currently is no ERISA funding requirement for the U.S. qualified plan for 2013.

Non-U.S. Plans

The following schedules provide information concerning the Company’s non-U.S. defined benefit pension plans and non-U.S. postretirement benefit plans:

	Non-U.S. Pension Benefits						Non-U.S. Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Change in benefit obligation:
Benefit obligation at beginning of year	$	7,717		$	6,802		$	91		$	83
Service cost	147			143			2			2
Interest cost	366			378			5			5
Employee contributions	11			14			—			—
Actuarial loss	419			575			10			5
Plan amendments	(71		)	(3		)	—			—
Effect of settlement	(11		)	(7		)	—			—
Effect of curtailment	(3		)	(1		)	(1		)	—
Benefits paid	(278		)	(266		)	(4		)	(4		)
Foreign currency changes	280			66			4			—
Other	2			16			—			—
Benefit obligation at, December 31	$	8,579		$	7,717		$	107		$	91
Change in plan assets:
Fair value of plan assets at beginning of year	$	7,206		$	6,741		$	—		$	—
Actual return on plan assets	721			311			—			—
Effect of settlement	(11		)	(6		)	—			—
Company contributions	389			320			4			4
Employee contributions	11			14			—			—
Benefits paid	(278		)	(266		)	(4		)	(4		)
Foreign currency changes	273			82			—			—
Other	1			10			—			—
Fair value of plan assets, December 31	$	8,312		$	7,206		$	—		$	—
Net funded status, December 31	$	(267	)	$	(511	)	$	(107	)	$	(91	)
Amounts recognized in the consolidated balance sheets:
Non-current assets	$	258		$	39		$	—		$	—
Current liabilities	(6		)	(106		)	(4		)	(4		)
Non-current liabilities	(519		)	(444		)	(103		)	(87		)
Net liability recognized, December 31	$	(267	)	$	(511	)	$	(107	)	$	(91	)
Amounts recognized in other comprehensive income (loss):
Prior service credit	$	93		$	23		$	—		$	1
Net actuarial (loss) gain	(3,309		)	(3,038		)	(27		)	(19		)
Total recognized accumulated other comprehensive (loss) income, December 31	$	(3,216	)	$	(3,015	)	$	(27	)	$	(18	)
Cumulative employer contributions in excess (deficient) of net periodic cost	2,949			2,504			(80		)	(73		)
Net amount recognized in consolidated balance sheet, December 31	$	(267	)	$	(511	)	$	(107	)	$	(91	)
Accumulated benefit obligation, December 31	$	8,229		$	7,246		$	—		$	—

	Non-U.S. Pension Benefits						Non-U.S. Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Reconciliation of prior service credit (cost):
Beginning balance	$	23		$	23		$	1		$	1
Recognized as component of net periodic benefit credit	(3		)	3			(1		)	—
Effect of curtailment	(1		)	—			—			—
Changes in plan assets and benefit obligations recognized in other comprehensive income:
Plan amendments	71			(3		)	—			—
Exchange rate adjustments	3			—			—			—
Prior service credit, December 31	$	93		$	23		$	—		$	1

	Non-U.S. Pension Benefits						Non-U.S. Postretirement Benefits
(In millions of dollars)	2012			2011			2012			2011
Reconciliation of net actuarial gain (loss):
Beginning balance	$	(3,038	)	$	(2,305	)	$	(19	)	$	(14	)
Recognized as component of net periodic benefit cost	118			115			1			—
Effect of settlement	1			—			—			—
Changes in plan assets and benefit obligations recognized in other comprehensive income (loss):
Liability experience	(419		)	(575		)	(10		)	(5		)
Asset experience	138			(261		)	—			—
Effect of curtailment	3			(1		)	1			—
Total amount recognized as change in plan assets and benefit obligations	(278		)	(837		)	(9		)	(5		)
Exchange rate adjustments	(112		)	(11		)	—			—
Net actuarial gain (loss), December 31	$	(3,309	)	$	(3,038	)	$	(27	)	$	(19	)

For the Years Ended December 31,	Non-U.S. Pension Benefits						Non-U.S. Postretirement Benefits
(In millions of dollars)	2012		2011		2010		2012		2011		2010
Total recognized in net periodic benefit cost and other comprehensive loss	$	246	$	792	$	66	$	16	$	12	$	15

Estimated amounts that will be amortized from accumulated other comprehensive income in the next fiscal year:

	Non-U.S. Pension Benefits			Non-U.S. Postretirement Benefits
(In millions of dollars)	2013			2013
Prior service cost	$	(6	)	$	—
Net actuarial loss	112			2
Projected cost	$	106		$	2

The weighted average actuarial assumptions utilized for the non-U.S. defined and postretirement benefit plans as of the end of the year are as follows:

	Non-U.S. Pension Benefits				Non-U.S. Postretirement Benefits
	2012		2011		2012		2011
Weighted average assumptions:
Discount rate (for expense)	4.77	%	5.41	%	4.95	%	5.51	%
Expected return on plan assets	7.68	%	7.91	%	—		—
Rate of compensation increase (for expense)	3.73	%	4.19	%	—		—
Discount rate (for benefit obligation)	4.33	%	4.77	%	4.45	%	4.95	%
Rate of compensation increase (for benefit obligation)	2.69	%	3.73	%	—		—

The non-U.S. defined benefit plans do not have any direct ownership of the Company’s common stock.

The pension plan in the United Kingdom holds a limited partnership interest in the Trident III private equity fund valued at approximately $200 million at December 31, 2012.

The projected benefit obligation, accumulated benefit obligation and fair value of plan assets for the non-U.S. pension plans with accumulated benefit obligations in excess of plan assets were $1.7 billion, $1.6 billion and $1.2 billion, respectively, as of December 31, 2012 and $1.4 billion, $1.3 billion and $1 billion, respectively, as of December 31, 2011.

The projected benefit obligation and fair value of plan assets for non-U.S. pension plans with projected benefit obligations in excess of plan assets was $1.7 billion and $1.2 billion, respectively, as of December 31, 2012 and $7.6 billion and $7.0 billion, respectively, as of December 31, 2011.

The components of the net periodic benefit cost for the non-U.S. defined benefit and other postretirement benefit plans and the curtailment, settlement and termination expenses are as follows:

For the Years Ended December 31,	Non-U.S. Pension Benefits									Non-U.S. Postretirement Benefits
(In millions of dollars)	2012			2011			2010			2012			2011		2010
Service cost	$	147		$	143		$	121		$	2		$	2	$	1
Interest cost	366			378			351			5			5		4
Expected return on plan assets	(583		)	(572		)	(520		)	—			—		—
Amortization of prior service cost	(3		)	(3		)	(3		)	(1		)	—		—
Recognized actuarial loss	118			115			73			1			—		—
Net periodic benefit cost	45			61			22			7			7		5
Settlement loss	1			—			5			—			—		—
Curtailment credit	(1		)	—			—			—			—		—
Special termination benefits	—			—			1			—			—		—
Total cost	$	45		$	61		$	28		$	7		$	7	$	5

The assumed health care cost trend rate was approximately 5.47% in 2012, gradually declining to 4.48% in 2031. Assumed health care cost trend rates can have a significant effect on the amounts reported for the non-U.S. health care plans. A one percentage point change in assumed health care cost trend rates would have the following effects:

(In millions of dollars)	1 Percentage Point Increase		1 Percentage Point Decrease
Effect on total of service and interest cost components	$	1	$	(1	)
Effect on postretirement benefit obligation	$	12	$	(10	)

Estimated Future Contributions

The Company expects to fund approximately $623 million to its non-U.S. pension plans in 2013. Funding requirements for non-U.S. plans vary by country. Contribution rates are generally based on local funding practices and requirements, which may differ significantly from measurements under U.S. GAAP. Funding amounts may be influenced by future asset performance, the level of discount rates and other variables impacting the assets and/or liabilities of the plan. Discretionary contributions may also be affected by alternative uses of the Company’s cash flows, including dividends, investments and share repurchases.

Estimated Future Benefit Payments

The Plan’s estimated future benefit payments for its pension and postretirement benefits (without reduction for Medicare subsidy receipts) at December 31, 2012 are as follows:

December 31,	Pension Benefits				Postretirement Benefits
(In millions of dollars)	U.S.		Non-U.S.		U.S.		Non-U.S.
2013	$	210	$	275	$	11	$	4
2014	$	221	$	276	$	11	$	4
2015	$	231	$	287	$	11	$	4
2016	$	242	$	310	$	11	$	4
2017	$	251	$	321	$	11	$	5
2018-2022	$	1,394	$	1,910	$	59	$	27

Defined Benefit Plans Fair Value Disclosures

In December 2008 the FASB issued guidance for Employers’ Disclosures About Pension and Other Post Retirement Benefit Plan Assets. The guidance requires fair value plan asset disclosures for an employer’s defined benefit pension and postretirement plans similar to the guidance on Fair Value Measurements as well as (a) how investment allocation decisions are made, (b) the major categories of plan assets, and (c) significant concentrations of risk within plan assets.

The U.S. and non-U.S. plan investments are classified into Level 1, which refers to investments valued using quoted prices from active markets for identical assets; Level 2, which refers to investments not traded on an active market but for which observable market inputs are readily available; and Level 3, which refers to investments valued based on significant unobservable inputs. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.

The following table sets forth, by level within the fair value hierarchy, a summary of the U.S. and non-U.S. plans investments measured at fair value on a recurring basis at December 31, 2012 and 2011.

	Fair Value Measurements at December 31, 2012
Assets (In millions of dollars)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Common/Collective trusts	$	16	$	5,376	$	—	$	5,392
Corporate obligations	—		2,236		1		2,237
Corporate stocks	2,005		4		9		2,018
Private equity/Partnerships	2		2		824		828
Government securities	9		309		—		318
Real estate	11		8		357		376
Short-term investment funds	410		4		—		414
Company common stock	276		—		—		276
Other investments	11		112		216		339
Insurance group annuity contracts	—		—		23		23
Swaps	—		4		—		4
Total investments	$	2,740	$	8,055	$	1,430	$	12,225

	Fair Value Measurements at December 31, 2011
Assets (In millions of dollars)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Common/Collective trusts	$	10	$	4,837	$	—	$	4,847
Corporate obligations	—		1,792		1		1,793
Corporate stocks	1,716		15		8		1,739
Private equity/Partnerships	—		1		779		780
Government securities	10		368		—		378
Real estate	14		4		319		337
Short-term investment funds	288		42		—		330
Company common stock	253		—		—		253
Other investments	1		34		202		237
Insurance group annuity contracts	—		—		20		20
Swaps	—		5		—		5
Total investments	$	2,292	$	7,098	$	1,329	$	10,719

There were no transfers between Level 1 and Level 2 assets during 2012 or 2011.

The tables below set forth a summary of changes in the fair value of the plans’ Level 3 assets for the years ended December 31, 2012 and December 31, 2011:

Assets (In millions)	Fair Value, January 1, 2012		Purchases		Sales			Unrealized Gain/ (Loss)		Realized Gain/ (Loss)			Exchange Rate Impact		Transfers in/(out) and Other		Fair Value, December 31, 2012
Private equity/Partnerships	$	779	$	86	$	(79	)	$	138	$	(113	)	$	13	$	—	$	824
Real estate	319		11		(3		)	104		(86		)	12		—		357
Other investments	202		17		(24		)	11		6			4		—		216
Insurance group annuity contracts	20		160		(157		)	1		(1		)	—		—		23
Corporate stocks	8		1		—			—		—			—		—		9
Corporate obligations	1		—		—			—		—			—		—		1
Total assets	$	1,329	$	275	$	(263	)	$	254	$	(194	)	$	29	$	—	$	1,430

Assets (In millions)	Fair Value, January 1, 2011		Purchases		Sales			Unrealized Gain/ (Loss)			Realized Gain/ (Loss)			Exchange Rate Impact			Transfers in/(out) and Other			Fair Value, December 31, 2011
Private equity/Partnerships	$	746	$	119	$	(80	)	$	(83	)	$	70		$	7		$	—		$	779
Real estate	293		—		—			22			(1		)	5			—			319
Other investments	177		32		(13		)	6			2			(2		)	—			202
Insurance group annuity contracts	20		151		(150		)	8			(9		)	—			—			20
Corporate stocks	1		8		—			(1		)	—			—			—			8
Corporate obligations	8		1		(8		)	2			(1		)	—			(1		)	1
Total assets	$	1,245	$	311	$	(251	)	$	(46	)	$	61		$	10		$	(1	)	$	1,329

The following is a description of the valuation methodologies used for assets measured at fair value:

Company common stock:  Valued at the closing price reported on the New York Stock Exchange.

Common stocks, preferred stocks, convertible equity securities and rights/warrants (included in Corporate stocks):  Valued at the closing price reported on the primary exchange.

Corporate bonds (included in corporate obligations):  The fair value of corporate bonds is estimated using recently executed transactions, market price quotations (where observable) and bond spreads. The spread data used are for the same maturity as the bond. If the spread data does not reference the issuer, then data that references a comparable issuer are used. When observable price quotations are not available, fair value is determined based on cash flow models.

Commercial paper (included in corporate obligations):  The fair value of commercial paper is estimated using observable market data such as maturity date, issue date, credit rating, current commercial paper rates and settlement date.

Commercial mortgage-backed and asset-backed securities (included in corporate obligations):  Fair value is determined using discounted cash flow models. Observable inputs are based on trade and quote activity of bonds with similar features including issuer vintage, purpose of underlying loan (first or second lien), prepayment speeds and credit ratings. The discount rate is the combination of the appropriate rate from the benchmark yield curve and the discount margin based on quoted prices.

Common/Collective trusts:  Valued at the quoted market prices of the underlying investments at year end.

U.S. government bonds (included in government securities):  The fair value of U.S. government bonds is estimated by pricing models that utilize observable market data including quotes, spreads and data points for yield curves.

U.S. agency securities (included in government securities):  U.S. agency securities are comprised of two main categories consisting of agency issued debt and mortgage pass-throughs. Agency issued debt securities are valued by benchmarking market-derived prices to quoted market prices and trade data for identical or comparable securities. Mortgage pass-throughs include certain “To-be-announced” (TBA) securities and mortgage pass-through pools. TBA securities are generally valued using quoted market prices or are benchmarked thereto. Fair value of mortgage pass-through pools are model driven with respect to spreads of the comparable TBA security.

Private equity and real estate partnerships:  Investments in private equity and real estate partnerships are valued based on the fair value reported by the manager of the corresponding partnership. The managers provide unaudited quarterly financial statements and audited annual financial statements which set forth the value of the fund. The valuations obtained from the managers are based on various analyses on the underlying holdings in each partnership, including financial valuation models and projections, comparable valuations from the public markets, and precedent private market transactions. Investments are valued in the accompanying financial statements based on the Plan’s beneficial interest in the underlying net assets of the partnership as determined by the partnership agreement.

Insurance group annuity contracts:  The fair values for these investments are based on the current market value of the aggregate accumulated contributions plus interest earned.

Swap assets and liabilities:  Fair values for interest rate swaps, equity index swaps and inflation swaps are estimated using a discounted cash flow pricing model. These models use observable market data such as contractual fixed rate, broker quotes, spot equity price or index value and dividend data. The fair values of credit default swaps are estimated using an income approach model which determines expected cash flows based on default probabilities from the issuer specific credit spread curve and credit loss recovery rates, both of which are dependent on market quotes.

Real estate investment trusts:  Valued at the closing price reported on an exchange.

Short-term investment funds:  Primarily high-grade money market instruments valued at net asset value at year-end.

Real estate: Valued by investment managers generally using proprietary pricing models.

Registered investment companies:  Valued at the closing price reported on the primary exchange.

Defined Contribution Plans

The Company maintains certain defined contribution plans for its employees, including the Marsh & McLennan Companies 401(k) Savings & Investment Plan (“401(k) Plan”), that are qualified under U.S. tax laws. Under these plans, eligible employees may contribute a percentage of their base salary, subject to certain limitations. For the 401(k) Plan, the Company matches a fixed portion of the employees’ contributions. The 401(k) Plan contains an Employee Stock Ownership Plan feature under U.S. tax law. Approximately $375 million of the 401(k) Plan’s assets at December 31, 2012 and $366 million at December 31, 2011 were invested in the Company’s common stock. If a participant does not choose an investment direction for his or her future contributions, they are automatically invested in a BlackRock LifePath Portfolio that most closely matches the participant’s expected retirement year. The cost of these defined contribution plans related to continuing operations was $50 million in 2012 and $48 million for 2011 and 2010.

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Income Taxes (U.S. Federal Statutory Rate) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
U.S. Federal statutory rate	35.00%	35.00%	35.00%
U.S. state and local income taxes—net of U.S. Federal income tax benefit	1.90%	1.60%	1.90%
Differences related to non-U.S. operations	(6.10%)	(6.50%)	(9.50%)
Other	(1.80%)	0.00%	(0.90%)
Effective tax rate	29.00%	30.10%	26.50%

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Fair Value Measurements (Changes In Fair Value Of Level 3 Liabilities Representing Acquisition Related Contingent Consideration) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Balance at January 1,	$ 110	[1]	$ 106
Additions	27		14
Payments	(30)		(13)
Revaluation Impact	(44)		3
Balance at December 31,	$ 63	[1]	$ 110	[1]

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

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Retirement Benefits (Narrative) (Details) (USD $) Share data in Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013
Shares of common stock represnting percentage of plan assets	7.00%
Assumed health care cost trend rate	5.47%
Ultimate assumed health care cost trend rate	4.48%
Expected fund in U.S. non qualified plan	$ 25,000,000
Limited partnership interest in private equity fund	200,000,000
Expected fund in non U.S. pension plans				623,000,000
ESOP invested in MMC common stock	375,000,000	366,000,000
The cost of defined contribution plans	50,000,000	48,000,000	48,000,000
Non Medicare Eligible [Member]
Defined benefit plan, health care cost trend rate assumed for next fiscal year	7.73%
Assumed health care cost trend rate	4.50%
Medicare Eligible [Member]
Defined benefit plan, health care cost trend rate assumed for next fiscal year	7.86%
Assumed health care cost trend rate	4.50%
U.S. Pension Benefits [Member]
The projected benefit obligation with accumulated benefit obligations	5,200,000,000	4,500,000,000
Accumulated benefit obligation	5,100,000,000	4,500,000,000
Aggregate fair value of plan assets	3,900,000,000	3,500,000,000
The projected benefit obligation	5,200,000,000	4,500,000,000
Fair value of plan assets with projected benefit obligation	3,900,000,000	3,500,000,000
Non- U.S Pension Benefits [Member]
The projected benefit obligation	1,700,000,000	7,600,000,000
Fair value of plan assets with projected benefit obligation	1,200,000,000	7,000,000,000
U.S. Plans [Member]
Actual asset allocation percentage of equity	58.00%
Actual asset allocation percentage of fixed income	42.00%
Common Stock Shares Held By Defined Benefit Plan	8
Defined benefit plan target allocation percentage of assets equity alternative investments range, minimum	53.00%
Defined benefit plan target allocation percentage of assets equity alternative investments range, maximum	63.00%
Defined benefit plan target allocation percentage of assets fixed income securities range, minimum	37.00%
Defined benefit plan target allocation percentage of assets fixed income securities range, maximum	47.00%
Assumed health care cost trend rate	5.00%
U.K. Plan [Member]
Actual asset allocation percentage of equity	52.00%
Actual asset allocation percentage of fixed income	48.00%
Target asset allocation non-U.S. Plan, equities	53.00%
Target asset allocation non-U.S. Plan, fixed income	47.00%
Defined benefit plan target allocation percentage of assets equity alternative investments range, minimum	50.00%
Defined benefit plan target allocation percentage of assets equity alternative investments range, maximum	56.00%
Defined benefit plan target allocation percentage of assets fixed income securities range, minimum	44.00%
Defined benefit plan target allocation percentage of assets fixed income securities range, maximum	50.00%
Non-U.S. Plans [Member]
Target asset allocation percentage for non-U.S. plan assets, U.K. Plans	82.00%
The projected benefit obligation with accumulated benefit obligations	1,700,000,000	1,400,000,000
Accumulated benefit obligation	1,600,000,000	1,300,000,000
Aggregate fair value of plan assets	$ 1,200,000,000	$ 1,000,000,000
Equity Funds [Member] | U.S. Plans [Member]
Target asset allocation U.S. Plan, equities, prior period	58.00%
Fixed Income Funds [Member] | U.S. Plans [Member]
Target asset allocation U.S. Plan, equities, prior period	42.00%

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Income Taxes (Deferred Income Tax Assets And Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Accrued expenses not currently deductible	$ 589		$ 559
Differences related to non-U.S. operations	159	[1]	188	[1]
Accrued retirement & postretirement benefits—non-U.S. operations	107		164
Accrued retirement benefits U.S.	604		507
Net operating losses	104	[2]	129	[2]
Income currently recognized for tax	75		62
Foreign tax credit carryforwards	224		169
Other	77		114
Total, deferred tax assets	1,939		1,892
Unrealized investment holding gains	2		3
Differences related to non-U.S. operations	107		99
Depreciation and amortization	245		233
Other	4		9
Total, deferred tax liabilities	358		344
Current assets	410		376
Other assets	1,223		1,205
Current liabilities	(18)		(12)
Other liabilities	(34)		(21)
Deferred Tax Assets Related To Non U S Operations [Member]
Valuation Allowance, Amount	7		3
Deferred Tax Assets Related To Net Operating Loss [Member]
Valuation Allowance, Amount	$ 65		$ 46

[1] Net of valuation allowances of $7 million in 2012 and $3 million in 2011.

[2] Net of valuation allowances of $65 million in 2012 and $46 million in 2011.

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Debt Debt (Scheduled Repayments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Maturities of Long-term Debt [Abstract]
Long-term Debt, Maturities, Repayments of Principal in 2012	$ 260
Long-term Debt, Maturities, Repayments of Principal in 2013	330
Long-term Debt, Maturities, Repayments of Principal in 2014	491
Long-term Debt, Maturities, Repayments of Principal in 2015	11
Long-term Debt, Maturities, Repayments of Principal in 2016	$ 262

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Stock Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2012

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of the status of MMC's stock option awards

A summary of the status of the Company’s stock option awards as of December 31, 2012 and changes during the year then ended is presented below:

	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value ($000)
Balance at January 1, 2012	38,895,109		$	29.21
Granted	3,547,733		$	31.88
Exercised	(6,892,731	)	$	26.01
Canceled or exchanged	—		—
Forfeited	(860,022	)	$	27.69
Expired	(2,644,296	)	$	42.85
Balance at December 31, 2012	32,045,793		$	29.10	4.5 years	186,467
Options vested or expected to vest at December 31, 2012	32,004,297		$	29.12	4.4 years	185,871
Options exercisable at December 31, 2012	16,115,605		$	28.85	3.8 years	106,606

Black-Scholes Option Pricing [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Option pricing valuation model for options granted

The assumptions used in the Black-Scholes option pricing valuation model for options granted by the Company in 2012, 2011 and 2010 are as follows:

	2012	2011	2010
Risk-free interest rate	1.26%-1.27%	2.28%-2.90%	3.15%-3.20%
Expected life (in years)	6.50	6.75	6.75
Expected volatility	26.2%-26.4%	25.4%-25.8%	26.3%-27.6%
Expected dividend yield	2.76%-2.80%	2.75%-2.86%	3.26%-3.52%

Deferred Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of restricted stock units award activity

A summary of the status of the Company's restricted stock awards as of December 31, 2012 and changes during the period then ended is presented below:

	Shares		Weighted Average Grant Date Fair Value
Non-vested balance at January 1, 2012	51,700		$	46.86
Granted	—		$	—
Vested	(20,000	)	$	46.14
Forfeited	—		$	—
Non-vested balance at December 31, 2012	31,700		$	47.31

Restricted Stock Units And Performance Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of restricted stock units award activity

	Restricted Stock Units				Performance Stock Units
	Shares		Weighted Average Grant Date Fair Value		Shares		Weighted Average Grant Date Fair Value
Non-vested balance at January 1, 2012	15,058,428		$	25.43	368,346		$	30.60
Granted	2,797,287		$	31.96	461,756		$	31.89
Vested	(8,209,388	)	$	23.97	(25,129	)	$	30.83
Forfeited	(682,089	)	$	28.49	(81,075	)	$	31.31
Adjustment due to performance	—		$	—	6,940		$	30.60
Non-vested balance at December 31, 2012	8,964,238		$	28.58	730,838		$	31.32

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Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income Loss) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Other Comprehensive Income (Loss) [Abstract]
Foreign currency translation adjustments (net of deferred tax liability of $9 and $14 in 2012 and 2011, respectively)	$ 140	$ (42)
Net unrealized investment gains (net of deferred tax liability of $2 and $1 in 2012 and 2011, respectively)	4	6
Net charges related to pension / post-retirement plans (net of deferred tax asset of $1,657 and $1,508 in 2012 and 2011, respectively)	(3,451)	(3,152)
Accumulated other comprehensive income (loss)	(3,307)	(3,188)
Foreign currency translation adjustments, tax portion	9	14
Net unrealized investment gains, tax portion	2	1
Net charges related to pension/ retiree plans, tax portion	$ 1,657	$ 1,508

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Integration and Restructuring Costs

12 Months Ended

Dec. 31, 2012

Restructuring Costs [Abstract]

Integration and Restructuring Costs

Integration and Restructuring Costs

In 2012, the Company implemented restructuring actions which resulted in costs totaling $78 million. Approximately $58 million of the restructuring charges are related to Mercer, approximately $51 million of which was incurred in the fourth quarter of 2012 related to senior management's recent operations review, including costs of approximately $16 million related to the disposal of Mercer's Canadian outsourcing business. The remaining restructuring costs consist primarily of severance and benefits, costs for future rent and other real estate costs. These costs were incurred as follows: Risk and Insurance Services—$8 million (all acquisition related); Consulting—$58 million (acquisition related—$1 million); and Corporate—$12 million.

Details of the restructuring liability activity from January 1, 2011 through December 31, 2012, including actions taken prior to 2012 are as follows:

(In millions of dollars)	Balance at 1/1/11		Expense Incurred		Cash Paid			Other			Balance at 12/31/11		Expense Incurred		Cash Paid			Other			Balance at 12/31/12
Severance	$	40	$	29	$	(40	)	$	(2	)	$	27	$	46	$	(38	)	$	1		$	36
Future rent under non-cancelable leases and other costs	171		22		(42		)	3			154		32		(50		)	(2		)	134
Total	$	211	$	51	$	(82	)	$	1		$	181	$	78	$	(88	)	$	(1	)	$	170

As of January 1, 2010, the liability balance related to restructuring activity was $259 million. In 2010, the Company accrued $141 million and had cash payments of $189 million related to restructuring activities that resulted in the liability balance at January 1, 2011 reported above.

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, other liabilities, or accrued compensation and employee benefits, depending on the nature of the items.

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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Components Of Fixed Assets

The components of fixed assets are as follows:

December 31,
(In millions of dollars)	2012			2011
Furniture and equipment	$	1,168		$	1,101
Land and buildings	412			405
Leasehold and building improvements	811			767
	2,391			2,273
Less-accumulated depreciation and amortization	(1,582		)	(1,469		)
	$	809		$	804

Basic Earnings per Share Calculation for Continuing Operations

Basic EPS Calculation - Continuing Operations
(In millions, except per share figures)	2012		2011		2010
Net income from continuing operations	$	1,204	$	982	$	565
Less: Net income attributable to non-controlling interests	25		22		16
Net income from continuing operations attributable to the Company	1,179		960		549
Less: Portion attributable to participating securities	2		6		6
Net income attributable to common shares for basic earnings per share	$	1,177	$	954	$	543
Basic weighted average common shares outstanding	544		542		540

Schedule of Earnings per Share for Net Income

Basic EPS Calculation - Net Income
(In millions, except per share figures)	2012		2011		2010
Net income attributable to the Company	$	1,176	$	993	$	855
Less: Portion attributable to participating securities	2		6		11
Net income attributable to common shares for basic earnings per share	$	1,174	$	987	$	844
Basic weighted average common shares outstanding	544		542		540

Diluted Earnings per Share for Continuing Operations

Diluted EPS Calculation - Continuing Operations
(In millions, except per share figures)	2012		2011		2010
Net income from continuing operations	$	1,204	$	982	$	565
Less: Net income attributable to non-controlling interests	25		22		16
Net income from continuing operations attributable to the Company	1,179		960		549
Less: Portion attributable to participating securities	2		6		6
Net income attributable to common shares for diluted earnings per share	$	1,177	$	954	$	543
Basic weighted average common shares outstanding	544		542		540
Dilutive effect of potentially issuable common shares	8		9		4
Diluted weighted average common shares outstanding	552		551		544
Average stock price used to calculate common stock equivalents	$	33.10	$	29.40	$	23.76

Schedule of Diluted Earnings per Share for Net Income

Diluted EPS Calculation - Net Income
(In millions, except per share figures)	2012		2011		2010
Net income attributable to the Company	$	1,176	$	993	$	855
Less: Portion attributable to participating securities	2		6		11
Net income attributable to common shares for diluted earnings per share	$	1,174	$	987	$	844
Basic weighted average common shares outstanding	544		542		540
Dilutive effect of potentially issuable common shares	8		9		4
Diluted weighted average common shares outstanding	552		551		544
Average stock price used to calculate common stock equivalents	$	33.10	$	29.40	$	23.76

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Integration and Restructuring Costs (Restructuring Activities) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Reserve [Roll Forward]
Liability at beginning of period	$ 181	$ 211	$ 259
Amount accrued	78	51	141
Cash Paid	(88)	(82)	(189)
Other	(1)	1
Liability at end of period	170	181	211
Severance [Member]
Restructuring Reserve [Roll Forward]
Liability at beginning of period	27	40
Amount accrued	46	29
Cash Paid	(38)	(40)
Other	1	(2)
Liability at end of period	36	27
Future Rent Under Non-Cancelable Leases and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Liability at beginning of period	154	171
Amount accrued	32	22
Cash Paid	(50)	(42)
Other	(2)	3
Liability at end of period	$ 134	$ 154

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Supplemental Disclosures (Schedule of Analysis for Doubtful Accounts) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	$ 105	$ 114	$ 107
Provision charged to operations	11	11	20
Accounts written-off, net of recoveries	(12)	(21)	(26)
Effect of exchange rate changes and other	2	1	13
Balance at end of year	$ 106	$ 105	$ 114

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Summary of Significant Accounting Policies (Components of Fixed Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 2,391	$ 2,273
Less-accumulated depreciation and amortization	(1,582)	(1,469)
Property, Plant and Equipment, Net	809	804	822
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,168	1,101
Land and Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	412	405
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 811	$ 767

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Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	6,000,000	6,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 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	15,133,774	21,543,833

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Long-term Commitments (Future Minimum Rental Commitments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Long-Term Commitments [Abstract]
2013	$ 168
2014	87
2015	48
Subsequent years	118
Total	$ 421

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Supplemental Disclosures

12 Months Ended

Dec. 31, 2012

Supplemental Cash Flow Information [Abstract]

Supplemental Disclosures

Supplemental Disclosures

The following schedule provides additional information concerning acquisitions, interest and income taxes paid:

(In millions of dollars)	2012			2011			2010
Assets acquired, excluding cash	$	380		$	214		$	867
Released from escrow in 2012	(62		)	—			—
Liabilities assumed	(42		)	(21		)	(176		)
Shares issued (7.6 million shares in 2010)	—			—			(183		)
Contingent/deferred purchase consideration	(46		)	(33		)	(81		)
Net cash outflow for current year acquisitions	230			160			427
Purchase of other intangibles	3			4			3
Deferred purchase consideration from prior years' acquisitions	59			11			62
Subtotal	$	292		$	175		$	492
Cash paid into escrow for future acquisition	—			62			—
Net cash outflow for acquisitions	$	292		$	237		$	492

(In millions of dollars)	2012		2011		2010
Interest paid	$	183	$	188	$	232
Income taxes paid, net of refunds	$	350	$	37	$	39

The Company had non-cash issuances of common stock under its share-based payment plan of $193 million, $197 million and $182 million for the years ended December 31, 2012, 2011 and 2010, respectively. The Company recorded stock-based compensation expense related to equity awards of $152 million, $165 million and $174 million for the years ended December 31, 2012, 2011 and 2010, respectively.

The consolidated statement of cash flows includes the cash flow impact of discontinued operations in each cash flow category. The cash flow impact of discontinued operations from the operating, financing and investing cash flow categories is as follows:

For the Year Ended December 31,
(In millions of dollars)	2012		2011		2010
Net cash provided by (used for) operations	$	—	$	11	$	(6	)
Net cash used for investing activities	$	—	$	—	$	(14	)
Effect of exchange rate changes on cash and cash equivalents	$	—	$	—	$	(2	)

The information above excludes the cash flow impacts of actual disposal transactions related to discontinued operations because the Company believes these transactions to be cash flows attributable to the parent company, arising from its decision to dispose of the discontinued operation. In 2010, the Company’s cash flow reflects cash provided by investing activities of $1.13 billion from the disposal of Kroll and $110 million related to the disposition of KLS.

An analysis of the allowance for doubtful accounts is as follows:

For the Year Ended December 31,
(In millions of dollars)	2012			2011			2010
Balance at beginning of year	$	105		$	114		$	107
Provision charged to operations	11			11			20
Accounts written-off, net of recoveries	(12		)	(21		)	(26		)
Effect of exchange rate changes and other	2			1			13
Balance at end of year	$	106		$	105		$	114

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Goodwill And Other Intangibles (Changes In The Carrying Amount Of Goodwill) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Goodwill [Roll Forward]
Balance as of January 1, as reported	$ 6,562		$ 6,420
Goodwill acquired	226		124
Other adjustments	4	[1]	18	[1]
Balance at December 31,	$ 6,792		$ 6,562

[1] Reflects increases due to the impact of foreign exchange in both years. 2012 also reflects a reduction due to purchase accounting adjustments.

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Stock Benefit Plans (Status Of Restricted Stock Awards) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Stock Benefit Plans [Abstract]
Non-vested balance at January 1, 2012 (Shares)	51,700
Granted (Shares)	0
Vested (Shares)	(20,000)
Forfeited (Shares)	0
Non-vested balance at December 31, 2012 (Shares)	31,700
Non-vested balance at January 1, 2012 (Weighted Average Grant Date Fair Value)	$ 46.86
Granted (Weighted Average Grant Date Fair Value)	$ 0
Vested (Weighted Average Grant Date Fair Value)	$ 46.14
Forfeited Granted (Weighted Average Grant Date Fair Value)	$ 0
Non-vested balance at December 31, 2012 (Weighted Average Grant Date Fair Value)	$ 47.31

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Retirement Benefits (Effects of One Percentage Point Change in Assumed Health Care Cost Trend Rates) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
U.S. Plans [Member]
Effect on total of service and interest cost components 1 Percentage Point Increase	$ 0
Effect on total of service and interest cost components 1 Percentage Point Decrease	0
Effect on postretirement benefit obligation 1 Percentage Point Increase	1
Effect on postretirement benefit obligation 1 Percentage Point Decrease	(5)
Non-U.S. Plans [Member]
Effect on total of service and interest cost components 1 Percentage Point Increase	1
Effect on total of service and interest cost components 1 Percentage Point Decrease	(1)
Effect on postretirement benefit obligation 1 Percentage Point Increase	12
Effect on postretirement benefit obligation 1 Percentage Point Decrease	$ (10)

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Supplemental Disclosures (Tables)

12 Months Ended

Dec. 31, 2012

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:

(In millions of dollars)	2012			2011			2010
Assets acquired, excluding cash	$	380		$	214		$	867
Released from escrow in 2012	(62		)	—			—
Liabilities assumed	(42		)	(21		)	(176		)
Shares issued (7.6 million shares in 2010)	—			—			(183		)
Contingent/deferred purchase consideration	(46		)	(33		)	(81		)
Net cash outflow for current year acquisitions	230			160			427
Purchase of other intangibles	3			4			3
Deferred purchase consideration from prior years' acquisitions	59			11			62
Subtotal	$	292		$	175		$	492
Cash paid into escrow for future acquisition	—			62			—
Net cash outflow for acquisitions	$	292		$	237		$	492

(In millions of dollars)	2012		2011		2010
Interest paid	$	183	$	188	$	232
Income taxes paid, net of refunds	$	350	$	37	$	39

Schedule Of Supplemental Cash Flow Income Statement Disclosures

The cash flow impact of discontinued operations from the operating, financing and investing cash flow categories is as follows:

For the Year Ended December 31,
(In millions of dollars)	2012		2011		2010
Net cash provided by (used for) operations	$	—	$	11	$	(6	)
Net cash used for investing activities	$	—	$	—	$	(14	)
Effect of exchange rate changes on cash and cash equivalents	$	—	$	—	$	(2	)

Analysis for doubtful accounts

An analysis of the allowance for doubtful accounts is as follows:

For the Year Ended December 31,
(In millions of dollars)	2012			2011			2010
Balance at beginning of year	$	105		$	114		$	107
Provision charged to operations	11			11			20
Accounts written-off, net of recoveries	(12		)	(21		)	(26		)
Effect of exchange rate changes and other	2			1			13
Balance at end of year	$	106		$	105		$	114

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Retirement Benefits (Schedule of Estimated Amounts That Will Be Amortized from Accumulated Other Comprehensive in the Next Fiscal Year) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
U.S. Pension Benefits [Member]
Prior service credit	$ (16)
Net actuarial loss	202
Projected cost	186
Non- U.S Pension Benefits [Member]
Prior service credit	(6)
Net actuarial loss	112
Projected cost	106
Non- U.S Postretirement Benefits [Member]
Prior service credit	0
Net actuarial loss	2
Projected cost	2
U.S. Postretirement Benefits [Member]
Prior service credit	0
Net actuarial loss	0
Projected cost	$ 0

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Integration and Restructuring Costs (Tables)

12 Months Ended

Dec. 31, 2012

Restructuring Costs [Abstract]

Restructuring Activities

Details of the restructuring liability activity from January 1, 2011 through December 31, 2012, including actions taken prior to 2012 are as follows:

(In millions of dollars)	Balance at 1/1/11		Expense Incurred		Cash Paid			Other			Balance at 12/31/11		Expense Incurred		Cash Paid			Other			Balance at 12/31/12
Severance	$	40	$	29	$	(40	)	$	(2	)	$	27	$	46	$	(38	)	$	1		$	36
Future rent under non-cancelable leases and other costs	171		22		(42		)	3			154		32		(50		)	(2		)	134
Total	$	211	$	51	$	(82	)	$	1		$	181	$	78	$	(88	)	$	(1	)	$	170

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Debt

12 Months Ended

Dec. 31, 2012

Debt [Abstract]

Debt

Debt

The Company’s outstanding debt is as follows:

December 31,
(In millions of dollars)	2012		2011
Short-term:
Current portion of long-term debt	$	260	$	260
Long-term:
Senior notes – 6.25% due 2012 (5.1% effective interest rate)	$	—	$	250
Senior notes – 4.850% due 2013	250		251
Senior notes – 5.875% due 2033	296		296
Senior notes – 5.375% due 2014	326		326
Senior notes – 5.75% due 2015	479		479
Senior notes – 2.30% due 2017	249		—
Senior notes – 9.25% due 2019	398		398
Senior notes – 4.80% due 2021	497		496
Mortgage – 5.70% due 2035	422		431
Other	1		1
	2,918		2,928
Less current portion	260		260
	$	2,658	$	2,668

The senior notes in the table above are publically registered by the Company with no guarantees attached.

During the first quarter of 2012, the Company repaid its 6.25% fixed rate $250 million senior notes that matured. The Company used proceeds from the issuance of 2.3%five-year $250 million senior notes in the first quarter of 2012 to fund the maturing notes.

On July 15, 2011, the Company purchased a total of $600 million of outstanding notes comprised of $330 million of its 5.375% notes due in 2014 and $270 million of its 5.750% notes due in 2015. The Company acquired the notes at market value plus a tender premium, which exceeded the notes' carrying values.

The Company used proceeds from the issuance of 4.80%ten-year $500 million senior notes in the third quarter of 2011 and cash on hand to fund the amounts associated with the tendered bonds.

In February 2013, the Company repaid $250 million of maturing senior notes.

The Company and certain of its foreign subsidiaries maintain a $1.0 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 requires the Company to maintain certain coverage and leverage ratios which are measured quarterly. There were no borrowings outstanding under this facility at December 31, 2012.

In December 2012, the Company closed on a $50 million, three-year delayed draw term loan facility. The interest rate on this facility is based on LIBOR plus a fixed margin which varies with the Company's credit ratings. The Company has the ability to increase the loan amount by $100 million during the life of the loan. The facility requires the Company to maintain coverage ratios and leverage ratios consistent with the revolving credit facility discussed above. There were no borrowings under this facility at December 31, 2012.

Derivative Financial Instruments

In February 2011, the Company entered into two$125 million3.5-year interest rate swaps to hedge changes in the fair value of the first $250 million of the outstanding 5.375% senior notes due in 2014.

Under the terms of the swaps, the counter-parties will pay the Company a fixed rate of 5.375% and the Company will pay interest at a floating rate of three-month LIBOR plus a fixed spread of 3.726%. The maturity date of the senior notes and the swaps match exactly. The floating rate resets quarterly, with every second reset occurring on the interest payment date of the senior notes. The swaps net settle every six months on the senior note coupon payment dates. The swaps are designated as fair value hedging instruments and are deemed to be perfectly effective in accordance with applicable accounting guidance. The fair value of the swaps at inception was zero and subsequent changes in the fair value of the interest rate swaps are reflected in the carrying value of the interest rate swaps and in the consolidated balance sheet. The carrying value of the debt on the balance sheet was adjusted by an equal amount. The gain or loss on the hedged item (fixed rate debt) and the offsetting gain or (loss) on the interest rate swaps for the periods ended December 31, 2012 and December 31, 2011 is as follows:

	2012							2011
Income statement classification (In millions of dollars)	Loss on Swaps			Gain on Notes		Net Income Effect		Gain on Swaps		Loss on Notes			Net Income Effect
Other Operating Expenses	$	(1	)	$	1	$	—	$	7	$	(7	)	$	—

The amounts earned and owed under the swap agreements are accrued each period and are reported in interest expense. There was no ineffectiveness recognized in the periods presented. The portion of the debt acquired under the tender offer discussed above was not part of the first $250 million outstanding and therefore, did not impact the hedged portion of this debt.

Additional credit facilities, guarantees and letters of credit are maintained with various banks, primarily related to operations located outside the United States, aggregating $247 million at December 31, 2012 and $248 million at December 31, 2011. There were no outstanding borrowings under these facilities at December 31, 2012 or December 31, 2011.

Scheduled repayments of long-term debt in 2013 and in the four succeeding years are $260 million, $330 million, $491 million, $11 million and $262 million, respectively.

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.

	December 31, 2012				December 31, 2011
(In millions of dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Short-term debt	$	260	$	261	$	260	$	261
Long-term debt	$	2,658	$	2,986	$	2,668	$	2,958

The fair value of the Company’s short-term debt, which consists primarily of term debt maturing within the next year, 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.