MARSH & MCLENNAN COMPANIES, INC. Presentation Networks

Line Image Concept Label Concept Type Period type Balance Concept name
* Network: (101 - Statement - Statement Of Income Alternative)
1 us-gaap: Income Statement [Abstract] xbrli:stringItemType duration us-gaap:IncomeStatementAbstract
2 us-gaap: Statement [Table] xbrli:stringItemType duration us-gaap:StatementTable
3 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
4 us-gaap: Revenue xbrli:monetaryItemType duration credit us-gaap:SalesRevenueServicesNet
5 us-gaap: Expense: xbrli:stringItemType duration us-gaap:OperatingExpensesAbstract
6 us-gaap: Compensation and benefits xbrli:monetaryItemType duration debit us-gaap:LaborAndRelatedExpense
7 us-gaap: Other operating expenses xbrli:monetaryItemType duration debit us-gaap:OtherCostAndExpenseOperating
8 us-gaap: Goodwill impairment charge xbrli:monetaryItemType duration debit us-gaap:GoodwillImpairmentLoss
9 us-gaap: Operating expenses xbrli:monetaryItemType duration debit us-gaap:OperatingExpenses
10 us-gaap: Operating income xbrli:monetaryItemType duration credit us-gaap:OperatingIncomeLoss
11 us-gaap: Interest income xbrli:monetaryItemType duration credit us-gaap:InvestmentIncomeInterest
12 us-gaap: Interest expense xbrli:monetaryItemType duration debit us-gaap:InterestExpense
13 us-gaap: Investment income (loss) xbrli:monetaryItemType duration credit us-gaap:InvestmentIncomeNonoperating
14 mmc: Income (loss) before income taxes xbrli:monetaryItemType duration credit mmc:IncomeLossFromContinuingOperationsBeforeIncomeTaxes
15 us-gaap: Income tax provision (benefit) xbrli:monetaryItemType duration debit us-gaap:IncomeTaxExpenseBenefit
16 us-gaap: Income (loss) from continuing operations xbrli:monetaryItemType duration credit us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
17 us-gaap: Discontinued operations, net of tax xbrli:monetaryItemType duration credit us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTax
18 us-gaap: Net income (loss) xbrli:monetaryItemType duration credit us-gaap:ProfitLoss
19 us-gaap: Less: Net income attributable to non-controlling interest xbrli:monetaryItemType duration debit us-gaap:NetIncomeLossAttributableToNoncontrollingInterest
20 us-gaap: Net income (loss) attributable to MMC xbrli:monetaryItemType duration credit us-gaap:NetIncomeLoss
21 us-gaap: Basic net income (loss) per share - Continuing operations us-types:perShareItemType duration us-gaap:IncomeLossFromContinuingOperationsPerBasicShare
22 us-gaap: - Net income (loss) attributable to MMC us-types:perShareItemType duration us-gaap:EarningsPerShareBasic
23 us-gaap: Diluted net income (loss) per share - Continuing operations us-types:perShareItemType duration us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare
24 us-gaap: - Net income (loss) attributable to MMC us-types:perShareItemType duration us-gaap:EarningsPerShareDiluted
25 us-gaap: Weighted average number of shares outstanding xbrli:stringItemType duration us-gaap:WeightedAverageNumberOfSharesOutstandingAbstract
26 us-gaap: - Basic xbrli:sharesItemType duration us-gaap:WeightedAverageNumberOfSharesOutstandingBasic
27 us-gaap: - Diluted xbrli:sharesItemType duration us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding
28 us-gaap: Shares outstanding at September 30, xbrli:sharesItemType instant us-gaap:CommonStockSharesOutstanding
29 us-gaap: Dividends declared per share us-types:perShareItemType duration us-gaap:CommonStockDividendsPerShareDeclared
* Network: (102 - Statement - Statement Of Financial Position Classified)
30 us-gaap: Statement of Financial Position [Abstract] xbrli:stringItemType duration us-gaap:StatementOfFinancialPositionAbstract
31 us-gaap: Statement [Table] xbrli:stringItemType duration us-gaap:StatementTable
32 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
33 us-gaap: ASSETS xbrli:stringItemType duration us-gaap:AssetsAbstract
34 us-gaap: Current assets: xbrli:stringItemType duration us-gaap:AssetsCurrentAbstract
35 us-gaap: Cash and cash equivalents xbrli:monetaryItemType instant debit us-gaap:CashAndCashEquivalentsAtCarryingValue
36 us-gaap: Receivables xbrli:stringItemType duration us-gaap:ReceivablesNetCurrentAbstract
37 us-gaap: Commissions and fees xbrli:monetaryItemType instant debit us-gaap:AccountsReceivableGrossCurrent
38 mmc: Advanced premiums and claims xbrli:monetaryItemType instant debit mmc:AdvancedPremiumsAndClaimsReceivables
39 us-gaap: Other xbrli:monetaryItemType instant debit us-gaap:OtherReceivables
40 mmc: Commissions, Fees, Premiums, Claims, and Other Receivables, Gross, Total xbrli:monetaryItemType instant debit mmc:CommissionsFeesPremiumsClaimsAndOtherReceivablesGross
41 us-gaap: Less-allowance for doubtful accounts and cancellations xbrli:monetaryItemType instant credit us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
42 us-gaap: Net receivables xbrli:monetaryItemType instant debit us-gaap:ReceivablesNetCurrent
43 us-gaap: Other current assets xbrli:monetaryItemType instant debit us-gaap:OtherAssetsCurrent
44 us-gaap: Total current assets xbrli:monetaryItemType instant debit us-gaap:AssetsCurrent
45 mmc: Goodwill and intangible assets xbrli:monetaryItemType instant debit mmc:GoodwillAndIntangibleAssetsNet
46 us-gaap: Fixed assets (net of accumulated depreciation and amortization of $1,468 at September 30, 2009 and $1,301 at December 31, 2008) xbrli:monetaryItemType instant debit us-gaap:PropertyPlantAndEquipmentNet
47 us-gaap: Pension related assets xbrli:monetaryItemType instant debit us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
48 us-gaap: Deferred tax assets xbrli:monetaryItemType instant debit us-gaap:DeferredTaxAssetsNetNoncurrent
49 us-gaap: Other assets xbrli:monetaryItemType instant debit us-gaap:OtherAssetsNoncurrent
50 us-gaap: Assets, Total xbrli:monetaryItemType instant debit us-gaap:Assets
51 us-gaap: LIABILITIES AND EQUITY xbrli:stringItemType duration us-gaap:LiabilitiesAndStockholdersEquityAbstract
52 us-gaap: Current liabilities: xbrli:stringItemType duration us-gaap:LiabilitiesCurrentAbstract
53 us-gaap: Short-term debt xbrli:monetaryItemType instant credit us-gaap:ShortTermBorrowings
54 us-gaap: Accounts payable and accrued liabilities xbrli:monetaryItemType instant credit us-gaap:OtherAccountsPayableAndAccruedLiabilities
55 us-gaap: Accrued compensation and employee benefits xbrli:monetaryItemType instant credit us-gaap:EmployeeRelatedLiabilitiesCurrent
56 us-gaap: Accrued income taxes xbrli:monetaryItemType instant credit us-gaap:AccruedIncomeTaxesCurrent
57 us-gaap: Dividends payable xbrli:monetaryItemType instant credit us-gaap:DividendsPayableCurrent
58 us-gaap: Total current liabilities xbrli:monetaryItemType instant credit us-gaap:LiabilitiesCurrent
59 mmc: Fiduciary liabilities xbrli:monetaryItemType instant credit mmc:FiduciaryLiabilities
60 mmc: Less - cash and investments held in a fiduciary capacity xbrli:monetaryItemType instant debit mmc:LessCashAndInvestmentsHeldInAFiduciaryCapacity
61 mmc: Fiduciary liabilities net of cash and investments held in a fiduciary capacity, Total xbrli:monetaryItemType instant credit mmc:FiduciaryLiabilitiesNetOfCashAndInvestmentsHeld
62 us-gaap: Long-term debt xbrli:monetaryItemType instant credit us-gaap:LongTermDebtAndCapitalLeaseObligations
63 us-gaap: Retirement and post-employment benefits xbrli:monetaryItemType instant credit us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
64 mmc: Liabilities for errors and omissions xbrli:monetaryItemType instant credit mmc:LiabilityForErrorsAndOmissions
65 us-gaap: Other liabilities xbrli:monetaryItemType instant credit us-gaap:OtherLiabilitiesNoncurrent
66 us-gaap: Commitments and contingencies xbrli:stringItemType duration us-gaap:CommitmentsAndContingencies2009
67 us-gaap: Equity: xbrli:stringItemType duration us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract
68 us-gaap: Preferred stock, $1 par value, authorized 6,000,000 shares, none issued xbrli:monetaryItemType instant credit us-gaap:PreferredStockValue
69 us-gaap: Common stock, $1 par value, authorized 1,600,000,000 shares, issued 560,641,640 shares at September 30, 2009 and December 31, 2008 xbrli:monetaryItemType instant credit us-gaap:CommonStockValue
70 us-gaap: Additional paid-in capital xbrli:monetaryItemType instant credit us-gaap:AdditionalPaidInCapitalCommonStock
71 us-gaap: Retained earnings xbrli:monetaryItemType instant credit us-gaap:RetainedEarningsAccumulatedDeficit
72 us-gaap: Accumulated other comprehensive loss xbrli:monetaryItemType instant credit us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
73 us-gaap: Non-controlling interests xbrli:monetaryItemType instant credit us-gaap:MinorityInterest
74 mmc: Stockholders Equity Subtotal Before Treasury Stock, Total xbrli:monetaryItemType instant credit mmc:StockholdersEquitySubtotalBeforeTreasuryStock
75 us-gaap: Less - treasury shares, at cost, 35,125,850 shares at September 30, 2009 and 46,375,622 shares at December 31, 2008 xbrli:monetaryItemType instant debit us-gaap:TreasuryStockValue
76 us-gaap: Total equity xbrli:monetaryItemType instant credit us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
77 us-gaap: Liabilities and Stockholders' Equity, Total xbrli:monetaryItemType instant credit us-gaap:LiabilitiesAndStockholdersEquity
* Network: (103 - Statement - Statement Of Financial Position Classified (Parenthetical))
78 us-gaap: Statement of Financial Position [Abstract] xbrli:stringItemType duration us-gaap:StatementOfFinancialPositionAbstract
79 us-gaap: Statement [Table] xbrli:stringItemType duration us-gaap:StatementTable
80 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
81 us-gaap: Fixed assets, accumulated depreciation and amortization xbrli:monetaryItemType instant credit us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
82 us-gaap: Preferred stock, par value us-types:perShareItemType instant us-gaap:PreferredStockParOrStatedValuePerShare
83 us-gaap: Preferred stock, authorized xbrli:sharesItemType instant us-gaap:PreferredStockSharesAuthorized
84 us-gaap: Preferred stock, issued xbrli:sharesItemType instant us-gaap:PreferredStockSharesIssued
85 us-gaap: Common stock, par value us-types:perShareItemType instant us-gaap:CommonStockParOrStatedValuePerShare
86 us-gaap: Common stock, authorized xbrli:sharesItemType instant us-gaap:CommonStockSharesAuthorized
87 us-gaap: Common stock, issued xbrli:sharesItemType instant us-gaap:CommonStockSharesIssued
88 us-gaap: Treasury shares, shares xbrli:sharesItemType instant us-gaap:TreasuryStockShares
* Network: (104 - Statement - Statement Of Cash Flows Indirect)
89 us-gaap: Statement of Cash Flows [Abstract] xbrli:stringItemType duration us-gaap:StatementOfCashFlowsAbstract
90 us-gaap: Statement [Table] xbrli:stringItemType duration us-gaap:StatementTable
91 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
92 us-gaap: Operating cash flows: xbrli:stringItemType duration us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract
93 us-gaap: Net income (loss) xbrli:monetaryItemType duration credit us-gaap:ProfitLoss
94 us-gaap: Adjustments to reconcile net income (loss) to cash provided by operations: xbrli:stringItemType duration us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract
95 us-gaap: Goodwill impairment charge xbrli:monetaryItemType duration debit us-gaap:GoodwillImpairmentLoss
96 us-gaap: Depreciation and amortization of fixed assets and capitalized software xbrli:monetaryItemType duration debit us-gaap:Depreciation
97 us-gaap: Amortization of intangible assets xbrli:monetaryItemType duration debit us-gaap:AmortizationOfIntangibleAssets
98 us-gaap: Provision for deferred income taxes xbrli:monetaryItemType duration debit us-gaap:DeferredIncomeTaxExpenseBenefit
99 us-gaap: Loss on investments xbrli:monetaryItemType duration credit us-gaap:GainLossOnInvestments
100 us-gaap: Loss on disposition of assets xbrli:monetaryItemType duration credit us-gaap:GainLossOnSaleOfOtherAssets
101 us-gaap: Stock option expense xbrli:monetaryItemType duration debit us-gaap:StockOptionPlanExpense
102 us-gaap: Changes in assets and liabilities: xbrli:stringItemType duration us-gaap:IncreaseDecreaseInOperatingCapitalAbstract
103 us-gaap: Net receivables xbrli:monetaryItemType duration credit us-gaap:IncreaseDecreaseInReceivables
104 mmc: Other current assets xbrli:monetaryItemType duration credit mmc:IncreaseDecreaseOtherCurrentAssets
105 us-gaap: Other assets xbrli:monetaryItemType duration credit us-gaap:IncreaseDecreaseInOtherOperatingAssets
106 us-gaap: Accounts payable and accrued liabilities xbrli:monetaryItemType duration debit us-gaap:IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities
107 us-gaap: Accrued compensation and employee benefits xbrli:monetaryItemType duration debit us-gaap:IncreaseDecreaseInEmployeeRelatedLiabilities
108 us-gaap: Accrued income taxes xbrli:monetaryItemType duration debit us-gaap:IncreaseDecreaseInAccruedIncomeTaxesPayable
109 us-gaap: Other liabilities xbrli:monetaryItemType duration debit us-gaap:IncreaseDecreaseInOtherOperatingLiabilities
110 mmc: Effect of exchange rate changes xbrli:monetaryItemType duration credit mmc:EffectExchangeRateOperatingCashFlows
111 us-gaap: Net cash provided by operations xbrli:monetaryItemType duration us-gaap:NetCashProvidedByUsedInOperatingActivities
112 us-gaap: Financing cash flows: xbrli:stringItemType duration us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract
113 us-gaap: Proceeds from issuance of debt xbrli:monetaryItemType duration debit us-gaap:ProceedsFromIssuanceOfLongTermDebt
114 us-gaap: Repayments of debt xbrli:monetaryItemType duration credit us-gaap:RepaymentsOfLongTermDebt
115 us-gaap: Purchase of non-controlling interests xbrli:monetaryItemType duration credit us-gaap:PaymentsToMinorityShareholders
116 us-gaap: Purchase of treasury shares xbrli:monetaryItemType duration credit us-gaap:PaymentsForRepurchaseOfCommonStock
117 us-gaap: Issuance of common stock xbrli:monetaryItemType duration debit us-gaap:ProceedsFromIssuanceOrSaleOfEquity
118 us-gaap: Dividends paid xbrli:monetaryItemType duration credit us-gaap:PaymentsOfDividendsCommonStock
119 us-gaap: Net cash used for financing activities xbrli:monetaryItemType duration debit us-gaap:NetCashProvidedByUsedInFinancingActivities
120 us-gaap: Investing cash flows: xbrli:stringItemType duration us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract
121 us-gaap: Capital expenditures xbrli:monetaryItemType duration credit us-gaap:PaymentsToAcquirePropertyPlantAndEquipment
122 us-gaap: Net sales of long-term investments xbrli:monetaryItemType duration credit us-gaap:PaymentsForProceedsFromInvestments
123 us-gaap: Proceeds from sales related to fixed assets xbrli:monetaryItemType duration debit us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment
124 us-gaap: Dispositions xbrli:monetaryItemType duration debit us-gaap:ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates
125 us-gaap: Acquisitions xbrli:monetaryItemType duration credit us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired
126 us-gaap: Other, net xbrli:monetaryItemType duration credit us-gaap:PaymentsForProceedsFromOtherInvestingActivities
127 us-gaap: Net cash used for investing activities xbrli:monetaryItemType duration debit us-gaap:NetCashProvidedByUsedInInvestingActivities
128 us-gaap: Effect of exchange rate changes on cash and cash equivalents xbrli:monetaryItemType duration debit us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents
129 us-gaap: Increase (decrease) in cash and cash equivalents xbrli:monetaryItemType duration us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease
130 us-gaap: Cash and cash equivalents at beginning of period xbrli:monetaryItemType instant debit us-gaap:CashAndCashEquivalentsAtCarryingValue
131 us-gaap: Cash and cash equivalents at end of period xbrli:monetaryItemType instant debit us-gaap:CashAndCashEquivalentsAtCarryingValue
* Network: (105 - Statement - Statement Of Shareholders Equity And Other Comprehensive Income)
132 us-gaap: Statement of Stockholders' Equity [Abstract] xbrli:stringItemType duration us-gaap:StatementOfStockholdersEquityAbstract
133 us-gaap: Statement [Table] xbrli:stringItemType duration us-gaap:StatementTable
134 us-gaap: Statement, Equity Components [Axis] xbrli:stringItemType duration us-gaap:StatementEquityComponentsAxis
135 us-gaap: Equity Component [Domain] us-types:domainItemType duration us-gaap:EquityComponentDomain
136 us-gaap: Common Stock us-types:domainItemType duration us-gaap:CommonStockMember
137 mmc: Additional Paid-In Capital us-types:domainItemType duration mmc:AdditionalPaidInCapitalCommonStockMember
138 us-gaap: Retained Earnings us-types:domainItemType duration us-gaap:RetainedEarningsMember
139 us-gaap: Accumulated Other Comprehensive Loss us-types:domainItemType duration us-gaap:AccumulatedOtherComprehensiveIncomeMember
140 us-gaap: Treasury Shares us-types:domainItemType duration us-gaap:TreasuryStockMember
141 us-gaap: Non-Controlling Interests us-types:domainItemType duration us-gaap:NoncontrollingInterestMember
142 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
143 us-gaap: Beginning Balance xbrli:monetaryItemType instant credit us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
144 us-gaap: Change in accrued stock compensation costs xbrli:monetaryItemType duration credit us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
145 us-gaap: Net income (loss) (a) xbrli:monetaryItemType duration credit us-gaap:ProfitLoss
146 us-gaap: Foreign currency translation adjustments (b) xbrli:monetaryItemType duration us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease
147 us-gaap: Issuance of shares under stock compensation plans and employee stock purchase plans xbrli:monetaryItemType duration credit us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
148 us-gaap: Unrealized investment holding gains, net of reclassification adjustments (c) xbrli:monetaryItemType duration credit us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
149 us-gaap: Dividend equivalents paid xbrli:monetaryItemType duration debit us-gaap:DividendsCash
150 us-gaap: Net changes under ASC Topic No. 960, net of tax (d) xbrli:monetaryItemType duration us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease
151 us-gaap: Dividends declared - (per share amounts: $.80) xbrli:monetaryItemType duration debit us-gaap:DividendsCommonStock
152 us-gaap: Purchase of subsidiary shares from non-controlling interests xbrli:monetaryItemType duration debit us-gaap:MinorityInterestDecreaseFromRedemptions
153 us-gaap: Issuance of shares for acquisitions xbrli:monetaryItemType duration credit us-gaap:StockIssuedDuringPeriodValueAcquisitions
154 us-gaap: Other changes xbrli:monetaryItemType duration debit us-gaap:StockholdersEquityOther
155 us-gaap: Ending Balance xbrli:monetaryItemType instant credit us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
156 us-gaap: Total Comprehensive Income (Loss) (a+b+c+d+e) xbrli:monetaryItemType duration credit us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
* Network: (106 - Statement - Statement Of Shareholders Equity And Other Comprehensive Income (Parenthetical))
157 us-gaap: Statement of Stockholders' Equity [Abstract] xbrli:stringItemType duration us-gaap:StatementOfStockholdersEquityAbstract
158 us-gaap: Statement [Table] xbrli:stringItemType duration us-gaap:StatementTable
159 us-gaap: Statement, Equity Components [Axis] xbrli:stringItemType duration us-gaap:StatementEquityComponentsAxis
160 us-gaap: Equity Component [Domain] us-types:domainItemType duration us-gaap:EquityComponentDomain
161 us-gaap: Common Stock us-types:domainItemType duration us-gaap:CommonStockMember
162 mmc: Additional Paid-In Capital us-types:domainItemType duration mmc:AdditionalPaidInCapitalCommonStockMember
163 us-gaap: Retained Earnings us-types:domainItemType duration us-gaap:RetainedEarningsMember
164 us-gaap: Accumulated Other Comprehensive Loss us-types:domainItemType duration us-gaap:AccumulatedOtherComprehensiveIncomeMember
165 us-gaap: Treasury Shares us-types:domainItemType duration us-gaap:TreasuryStockMember
166 us-gaap: Non-Controlling Interests us-types:domainItemType duration us-gaap:NoncontrollingInterestMember
167 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
168 us-gaap: Dividends declared, per share us-types:perShareItemType duration us-gaap:CommonStockDividendsPerShareDeclared
* Network: (107 - Disclosure - 1.Nature of Operations)
169 mmc: Notes to Financial Statements [Abstract] xbrli:stringItemType duration mmc:NotesToFinancialStatementsAbstract
170 us-gaap: 1.Nature of Operations us-types:textBlockItemType duration us-gaap:NatureOfOperations
* Network: (108 - Disclosure - 2.Principles of Consolidation and Other Matters)
171 mmc: Notes to Financial Statements [Abstract] xbrli:stringItemType duration mmc:NotesToFinancialStatementsAbstract
172 us-gaap: 2.Principles of Consolidation and Other Matters us-types:textBlockItemType duration us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock
* Network: (109 - Disclosure - 3.Fiduciary Assets and Liabilities)
173 mmc: Notes to Financial Statements [Abstract] xbrli:stringItemType duration mmc:NotesToFinancialStatementsAbstract
174 mmc: 3.Fiduciary Assets and Liabilities us-types:textBlockItemType duration mmc:FiduciaryAssetsAndLiabilitiesTextBlock
* Network: (110 - Disclosure - 4.Per Share Data)
175 mmc: Notes to Financial Statements [Abstract] xbrli:stringItemType duration mmc:NotesToFinancialStatementsAbstract
176 us-gaap: 4.Per Share Data us-types:textBlockItemType duration us-gaap:EarningsPerShareTextBlock
* Network: (111 - Disclosure - 5.Supplemental Disclosures to the Consolidated Statements of Cash Flows)
177 mmc: Notes to Financial Statements [Abstract] xbrli:stringItemType duration mmc:NotesToFinancialStatementsAbstract
178 us-gaap: 5.Supplemental Disclosures to the Consolidated Statements of Cash Flows us-types:textBlockItemType duration us-gaap:CashFlowSupplementalDisclosuresTextBlock
* Network: (112 - Disclosure - 6.Comprehensive Income (Loss))
179 mmc: Notes to Financial Statements [Abstract] xbrli:stringItemType duration mmc:NotesToFinancialStatementsAbstract
180 us-gaap: 6.Comprehensive Income (Loss) us-types:textBlockItemType duration us-gaap:ComprehensiveIncomeNoteTextBlock
* Network: (113 - Disclosure - 7.Acquisitions)
181 mmc: Notes to Financial Statements [Abstract] xbrli:stringItemType duration mmc:NotesToFinancialStatementsAbstract
182 us-gaap: 7.Acquisitions us-types:textBlockItemType duration us-gaap:BusinessCombinationDisclosureTextBlock
* Network: (114 - Disclosure - 8.Discontinued Operations)
183 mmc: Notes to Financial Statements [Abstract] xbrli:stringItemType duration mmc:NotesToFinancialStatementsAbstract
184 us-gaap: 8.Discontinued Operations us-types:textBlockItemType duration us-gaap:DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock
* Network: (115 - Disclosure - 9.Goodwill and Other Intangibles)
185 mmc: Notes to Financial Statements [Abstract] xbrli:stringItemType duration mmc:NotesToFinancialStatementsAbstract
186 us-gaap: 9.Goodwill and Other Intangibles us-types:textBlockItemType duration us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock
* Network: (116 - Disclosure - 10.Fair Value Measurements)
187 mmc: Notes to Financial Statements [Abstract] xbrli:stringItemType duration mmc:NotesToFinancialStatementsAbstract
188 us-gaap: 10.Fair Value Measurements us-types:textBlockItemType duration us-gaap:FairValueDisclosuresTextBlock
* Network: (117 - Disclosure - 11.Retirement Benefits)
189 mmc: Notes to Financial Statements [Abstract] xbrli:stringItemType duration mmc:NotesToFinancialStatementsAbstract
190 us-gaap: 11.Retirement Benefits us-types:textBlockItemType duration us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock
* Network: (118 - Disclosure - 12.Debt)
191 mmc: Notes to Financial Statements [Abstract] xbrli:stringItemType duration mmc:NotesToFinancialStatementsAbstract
192 us-gaap: 12.Debt us-types:textBlockItemType duration us-gaap:DebtDisclosureTextBlock
* Network: (119 - Disclosure - 13.Restructuring Costs)
193 mmc: Notes to Financial Statements [Abstract] xbrli:stringItemType duration mmc:NotesToFinancialStatementsAbstract
194 us-gaap: 13.Restructuring Costs us-types:textBlockItemType duration us-gaap:RestructuringAndRelatedActivitiesDisclosureTextBlock
* Network: (120 - Disclosure - 14.Financial Instruments)
195 mmc: Notes to Financial Statements [Abstract] xbrli:stringItemType duration mmc:NotesToFinancialStatementsAbstract
196 us-gaap: 14.Financial Instruments us-types:textBlockItemType duration us-gaap:ScheduleOfFinancialInstrumentsOwnedAndPledgedAsCollateralTextBlock
* Network: (121 - Disclosure - 15.Common Stock)
197 mmc: Notes to Financial Statements [Abstract] xbrli:stringItemType duration mmc:NotesToFinancialStatementsAbstract
198 us-gaap: 15.Common Stock us-types:textBlockItemType duration us-gaap:ScheduleOfStockByClassTextBlock
* Network: (122 - Disclosure - 16.Claims, Lawsuits and Other Contingencies)
199 mmc: Notes to Financial Statements [Abstract] xbrli:stringItemType duration mmc:NotesToFinancialStatementsAbstract
200 us-gaap: 16.Claims, Lawsuits and Other Contingencies us-types:textBlockItemType duration us-gaap:ScheduleOfLossContingenciesByContingencyTextBlock
* Network: (123 - Disclosure - 17.Segment Information)
201 mmc: Notes to Financial Statements [Abstract] xbrli:stringItemType duration mmc:NotesToFinancialStatementsAbstract
202 us-gaap: 17.Segment Information us-types:textBlockItemType duration us-gaap:SegmentReportingDisclosureTextBlock
* Network: (124 - Disclosure - 18.New Accounting Pronouncements)
203 mmc: Notes to Financial Statements [Abstract] xbrli:stringItemType duration mmc:NotesToFinancialStatementsAbstract
204 us-gaap: 18.New Accounting Pronouncements us-types:textBlockItemType duration us-gaap:ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock
* Network: (125 - Disclosure - Document Information)
205 dei: Document Information [Text Block] us-types:textBlockItemType duration dei:DocumentInformationTextBlock
206 dei: Document Type us-types:SECReportItemType duration dei:DocumentType
207 dei: Amendment Flag xbrli:booleanItemType duration dei:AmendmentFlag
208 dei: Document Period End Date xbrli:dateItemType duration dei:DocumentPeriodEndDate
* Network: (126 - Disclosure - Entity Information)
209 dei: Entity [Text Block] us-types:textBlockItemType duration dei:EntityTextBlock
210 dei: Trading Symbol xbrli:normalizedStringItemType duration dei:TradingSymbol
211 dei: Entity Registrant Name xbrli:normalizedStringItemType duration dei:EntityRegistrantName
212 dei: Entity Central Index Key us-types:centralIndexKeyItemType duration dei:EntityCentralIndexKey
213 dei: Current Fiscal Year End Date xbrli:gMonthDayItemType duration dei:CurrentFiscalYearEndDate
214 dei: Entity Filer Category us-types:filerCategoryItemType duration dei:EntityFilerCategory
215 dei: Entity Common Stock, Shares Outstanding xbrli:sharesItemType instant dei:EntityCommonStockSharesOutstanding