Consolidated Statements Of Equity (USD $) In Millions, unless otherwise specified
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Total
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Common Stock [Member]
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Additional Paid-in Capital [Member]
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Retained Earnings [Member]
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Accumulated Other Comprehensive Gain (Loss) [Member]
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Treasury Shares [Member]
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Non-Controlling Interests [Member]
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Beginning balance at Dec. 31, 2011 |
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$ 561us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
$ 1,156us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
$ 7,949us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
$ (3,188)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
$ (595)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
$ 57us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |
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Change in accrued stock compensation costs |
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(16)us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
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Issuance of shares under stock compensation plans and employee stock purchase plans and related tax impact |
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(34)mmc_StockIssuedDuringPeriodValueSharebasedCompensationandEmployeeStockPurchasePlanAndRelatedTaxDeficiency / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
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378mmc_StockIssuedDuringPeriodValueSharebasedCompensationandEmployeeStockPurchasePlanAndRelatedTaxDeficiency / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
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Purchase of subsidiary shares from non-controlling interests |
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1us-gaap_MinorityInterestDecreaseFromRedemptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
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Net income attributable to the Company |
1,201us-gaap_ProfitLoss |
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1,176us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
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25us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Dividend equivalents declared - (per share amounts: $1.06 in 2014, $0.96 in 2013, and $0.90 in 2012) |
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(8)us-gaap_DividendsShareBasedCompensationCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
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Dividends declared – (per share amounts: $1.06 in 2014, $0.96 in 2013, and $0.90 in 2012) |
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(489)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
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Other comprehensive (loss) income, net of tax |
(119)us-gaap_OtherComprehensiveIncomeLossNetOfTax |
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(119)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
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Issuance of shares for acquisitions |
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0us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
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Purchase of treasury shares |
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(230)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
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Distributions |
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(16)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Other changes |
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(2)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Ending balance at Dec. 31, 2012 |
6,606us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |
561us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
1,107us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
8,628us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
(3,307)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
(447)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
64us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |
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Change in accrued stock compensation costs |
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(22)us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
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Issuance of shares under stock compensation plans and employee stock purchase plans and related tax impact |
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(57)mmc_StockIssuedDuringPeriodValueSharebasedCompensationandEmployeeStockPurchasePlanAndRelatedTaxDeficiency / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
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481mmc_StockIssuedDuringPeriodValueSharebasedCompensationandEmployeeStockPurchasePlanAndRelatedTaxDeficiency / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
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Purchase of subsidiary shares from non-controlling interests |
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0us-gaap_MinorityInterestDecreaseFromRedemptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
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Net income attributable to the Company |
1,385us-gaap_ProfitLoss |
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1,357us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
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28us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Dividend equivalents declared - (per share amounts: $1.06 in 2014, $0.96 in 2013, and $0.90 in 2012) |
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(6)us-gaap_DividendsShareBasedCompensationCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
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Dividends declared – (per share amounts: $1.06 in 2014, $0.96 in 2013, and $0.90 in 2012) |
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(527)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
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Other comprehensive (loss) income, net of tax |
686us-gaap_OtherComprehensiveIncomeLossNetOfTax |
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686us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
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Issuance of shares for acquisitions |
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1us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
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Purchase of treasury shares |
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(550)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
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Distributions |
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(28)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Other changes |
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6us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Ending balance at Dec. 31, 2013 |
7,975us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |
561us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
1,028us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
9,452us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
(2,621)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
(515)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
70us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |
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Change in accrued stock compensation costs |
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(15)us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
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Issuance of shares under stock compensation plans and employee stock purchase plans and related tax impact |
|
|
(83)mmc_StockIssuedDuringPeriodValueSharebasedCompensationandEmployeeStockPurchasePlanAndRelatedTaxDeficiency / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
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387mmc_StockIssuedDuringPeriodValueSharebasedCompensationandEmployeeStockPurchasePlanAndRelatedTaxDeficiency / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
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Purchase of subsidiary shares from non-controlling interests |
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0us-gaap_MinorityInterestDecreaseFromRedemptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
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Net income attributable to the Company |
1,497us-gaap_ProfitLoss |
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1,465us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
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32us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Dividend equivalents declared - (per share amounts: $1.06 in 2014, $0.96 in 2013, and $0.90 in 2012) |
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(3)us-gaap_DividendsShareBasedCompensationCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
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Dividends declared – (per share amounts: $1.06 in 2014, $0.96 in 2013, and $0.90 in 2012) |
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(579)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
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Other comprehensive (loss) income, net of tax |
(1,226)us-gaap_OtherComprehensiveIncomeLossNetOfTax |
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(1,226)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
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Issuance of shares for acquisitions |
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3us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
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Purchase of treasury shares |
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(800)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
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Distributions |
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(20)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Other changes |
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(3)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Ending balance at Dec. 31, 2014 |
$ 7,133us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |
$ 561us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
$ 930us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
$ 10,335us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
$ (3,847)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
$ (925)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
$ 79us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |