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Nature Of Operations	9 Months Ended
Nature Of Operations	Sep. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [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. 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, economic and brand consulting services. Acquisitions impacting the Risk and Insurance Services and Consulting segments are discussed in Note 7 to the consolidated financial statements. The Company has "continuing involvement" in certain Corporate Advisory and Restructuring businesses (“CARG”), that were disposed of in 2008. The run-off of the CARG business is being managed by the Company’s corporate departments and financial results of these entities are included in “Corporate” for segment reporting purposes.