Segment Information (Details For MMC's Operating Segments) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |||||||||||||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Segment Reporting Information [Line Items] | ||||||||||||||
Revenue | $ 12,261 | $ 11,924 | $ 11,526 | |||||||||||
Operating Income (Loss) | 2,077 | 1,829 | 1,638 | |||||||||||
Total Assets | 16,980 | 16,288 | 15,454 | |||||||||||
Depreciation and Amortization | 358 | 349 | 332 | |||||||||||
Capital Expenditures | 401 | 320 | 280 | |||||||||||
Risk and Insurance Services Segment [Member]
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Segment Reporting Information [Line Items] | ||||||||||||||
Interest Income, Fiduciary Assets | 27 | 39 | 47 | |||||||||||
Consulting Segment [Member]
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Segment Reporting Information [Line Items] | ||||||||||||||
Interest Income, Fiduciary Assets | 5 | 4 | 4 | |||||||||||
Operating Segments [Member]
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Segment Reporting Information [Line Items] | ||||||||||||||
Revenue | 12,297 | 11,963 | 11,566 | |||||||||||
Operating Income (Loss) | 2,266 | 2,026 | 1,817 | |||||||||||
Total Assets | 16,543 | 15,035 | 13,922 | |||||||||||
Depreciation and Amortization | 307 | 309 | 301 | |||||||||||
Capital Expenditures | 313 | 248 | 237 | |||||||||||
Operating Segments [Member] | Risk and Insurance Services Segment [Member]
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Segment Reporting Information [Line Items] | ||||||||||||||
Revenue | 6,596 | [1] | 6,350 | [1] | 6,079 | [1] | ||||||||
Operating Income (Loss) | 1,421 | 1,334 | 1,200 | |||||||||||
Total Assets | 11,365 | 9,832 | 9,102 | |||||||||||
Depreciation and Amortization | 192 | 196 | 189 | |||||||||||
Capital Expenditures | 158 | 131 | 146 | |||||||||||
Interest Income, Fiduciary Assets | 27 | 39 | 47 | |||||||||||
Equity method income | 8 | 11 | 14 | |||||||||||
Operating Segments [Member] | Consulting Segment [Member]
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Segment Reporting Information [Line Items] | ||||||||||||||
Revenue | 5,701 | [2] | 5,613 | [2] | 5,487 | [2] | ||||||||
Operating Income (Loss) | 845 | 692 | 617 | |||||||||||
Total Assets | 5,178 | 5,203 | 4,820 | |||||||||||
Depreciation and Amortization | 115 | 113 | 112 | |||||||||||
Capital Expenditures | 155 | 117 | 91 | |||||||||||
Interest Income, Fiduciary Assets | 5 | 4 | 4 | |||||||||||
Intersegment Eliminations [Member]
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Segment Reporting Information [Line Items] | ||||||||||||||
Revenue | (36) | [3] | (39) | [3] | (40) | [3] | ||||||||
Intersegment Eliminations [Member] | Risk and Insurance Services Segment [Member]
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Segment Reporting Information [Line Items] | ||||||||||||||
Revenue | 5 | 5 | 4 | |||||||||||
Intersegment Eliminations [Member] | Consulting Segment [Member]
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Segment Reporting Information [Line Items] | ||||||||||||||
Revenue | 31 | 34 | 36 | |||||||||||
Corporate, Non-Segment [Member]
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Segment Reporting Information [Line Items] | ||||||||||||||
Operating Income (Loss) | (189) | [3] | (197) | [3] | (179) | [3] | ||||||||
Total Assets | 437 | [4] | 1,253 | [4] | 1,532 | [4] | ||||||||
Depreciation and Amortization | 51 | 40 | 31 | |||||||||||
Capital Expenditures | $ 88 | $ 72 | $ 43 | |||||||||||
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