XML 65 R51.htm IDEA: XBRL DOCUMENT
v3.22.4

Supplemental Disclosures (Supplemental Operating and Financing Cash Flow Items) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Operating: |  |  |
Contingent consideration payments for prior year acquisitions | $ (38) | $ (49) | $ (48)
Receipt of contingent consideration for dispositions | 0 | 19 | 0
Acquisition/disposition related net charges for adjustments | 49 | 57 | 26
Adjustments and payments related to contingent consideration | 11 | 27 | (22)
Financing: |  |  |
Contingent consideration for prior year acquisitions | (32) | (28) | (54)
Deferred consideration related to prior year acquisitions | (126) | (89) | (68)
Payments of deferred and contingent consideration for acquisitions | (158) | (117) | (122)
Receipt of contingent consideration for dispositions | $ 3 | $ 71 | $ 0

X
- Definition Adjustments and Payments Related to Contingent Consideration + References No definition available. + Details
Name: | mmc_AdjustmentsAndPaymentsRelatedToContingentConsideration
Namespace Prefix: | mmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings, Net + References No definition available. + Details
Name: | mmc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedinEarningsNet
Namespace Prefix: | mmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Contingent Consideration, Payment + References No definition available. + Details
Name: | mmc_PaymentofContingentConsideration
Namespace Prefix: | mmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Payments For Previous Acquisition, Contingent Consideration + References No definition available. + Details
Name: | mmc_PaymentsForPreviousAcquisitionContingentConsideration
Namespace Prefix: | mmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Payments For Previous Acquisition, Deferred Consideration + References No definition available. + Details
Name: | mmc_PaymentsForPreviousAcquisitionDeferredConsideration
Namespace Prefix: | mmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Payments For Previous Acquisition, Deferred and Contingent Consideration + References No definition available. + Details
Name: | mmc_PaymentsForPreviousAcquisitionDeferredandContingentConsideration
Namespace Prefix: | mmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Proceeds From Contingent Consideration, Prior Period Dispositions + References No definition available. + Details
Name: | mmc_ProceedsFromContingentConsiderationPriorPeriodDispositions
Namespace Prefix: | mmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proceeds from Previous Disposition, Contingent Consideration + References No definition available. + Details
Name: | mmc_ProceedsFromPreviousDispositionContingentConsideration
Namespace Prefix: | mmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AdditionalCashFlowElementsFinancingActivitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AdditionalCashFlowElementsOperatingActivitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration