$MMC
MARSH & MCLENNAN COMPANIES, INC. Stock $mmc

$mmc Overview Financials Valuation SEC Filings Company Website

2024 Q3 Form 10-Q Financial Statement

#000006270924000071 Filed on July 18, 2024

Income Statement

Concept	2024 Q3	2024 Q2
Revenue	$5.697B	$6.221B
YoY Change	5.85%	5.87%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin	$3.442B	$3.454B
YoY Change	4.72%	3.51%
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$359.0M	$176.0M
YoY Change	99.44%	-1.12%
% of Gross Profit
Operating Expenses	$4.589B	$4.579B
YoY Change	4.63%	5.17%
Operating Profit	$1.108B	$1.642B
YoY Change	11.24%	12.7%
Interest Expense	-$141.0M	-$143.0M
YoY Change	-197.24%	7.52%
% of Operating Profit	-12.73%	-8.71%
Other Income/Expense, Net	$68.00M	$66.00M
YoY Change	9.68%	10.0%
Pretax Income	$1.035B	$1.565B
YoY Change	11.29%	13.08%
Income Tax	$283.0M	$425.0M
% Of Pretax Income	27.34%	27.16%
Net Earnings	$747.0M	$1.125B
YoY Change	2.33%	8.7%
Net Earnings / Revenue	13.11%	18.08%
Basic Earnings Per Share	$1.52	$2.28
Diluted Earnings Per Share	$1.51	$2.27
COMMON SHARES
Basic Shares Outstanding	491.8M shares	492.7M shares
Diluted Shares Outstanding	496.0M shares	496.0M shares

Balance Sheet

Concept	2024 Q3	2024 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.798B	$1.653B
YoY Change	-87.79%	-87.02%
Cash & Equivalents	$1.798B	$1.653B
Short-Term Investments
Other Short-Term Assets	$1.143B	$1.133B
YoY Change	10.97%	61.17%
Inventory
Prepaid Expenses
Receivables	$7.422B	$8.169B
Other Receivables	$0.00	$0.00
Total Short-Term Assets	$22.29B	$22.02B
YoY Change	0.03%	5.86%
LONG-TERM ASSETS
Property, Plant & Equipment	$884.0M	$879.0M
YoY Change	2.91%	-63.96%
Goodwill	$18.24B	$17.52B
YoY Change	9.49%	5.38%
Intangibles
YoY Change
Long-Term Investments	$275.0M	$276.0M
YoY Change	5.77%	10.84%
Other Assets	$1.626B	$1.596B
YoY Change	6.14%	-59.56%
Total Long-Term Assets	$27.58B	$26.57B
YoY Change	7.22%	3.12%
TOTAL ASSETS
Total Short-Term Assets	$22.29B	$22.02B
Total Long-Term Assets	$27.58B	$26.57B
Total Assets	$49.86B	$48.59B
YoY Change	3.88%	4.35%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$3.099B	$3.205B
YoY Change	-1.4%	2.17%
Accrued Expenses	$3.098B	$2.390B
YoY Change	5.55%	2.58%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$749.0M
YoY Change		47.44%
Long-Term Debt Due	$518.0M	$518.0M
YoY Change	-72.27%	-72.25%
Total Short-Term Liabilities	$19.60B	$18.86B
YoY Change	-4.86%	-4.79%
LONG-TERM LIABILITIES
Long-Term Debt	$12.33B	$12.28B
YoY Change	4.66%	19.82%
Other Long-Term Liabilities	$1.396B	$1.261B
YoY Change	13.87%	-71.12%
Total Long-Term Liabilities	$13.73B	$13.54B
YoY Change	5.53%	-7.36%
TOTAL LIABILITIES
Total Short-Term Liabilities	$19.60B	$18.86B
Total Long-Term Liabilities	$13.73B	$13.54B
Total Liabilities	$33.33B	$32.40B
YoY Change	-0.84%	-6.36%
SHAREHOLDERS EQUITY
Retained Earnings	$24.52B	$24.58B
YoY Change	11.42%	11.82%
Common Stock	$1.850B	$1.758B
YoY Change	8.12%	7.52%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$13.88B	$13.37B
YoY Change
Total Liabilities & Shareholders Equity	$49.86B	$48.59B
YoY Change	3.88%	4.35%

Cashflow Statement

Concept	2024 Q3	2024 Q2
OPERATING ACTIVITIES
Net Income	$747.0M	$1.125B
YoY Change	2.33%	8.7%
Depreciation, Depletion And Amortization	$359.0M	$176.0M
YoY Change	99.44%	-1.12%
Cash From Operating Activities	$1.912B	$1.215B
YoY Change	5.64%	-18.13%
INVESTING ACTIVITIES
Capital Expenditures	$73.00M	$80.00M
YoY Change	-34.82%	-18.37%
Acquisitions
YoY Change
Other Investing Activities	-$320.0M	-$335.0M
YoY Change	-3.03%	857.14%
Cash From Investing Activities	-$393.0M	-$415.0M
YoY Change	-11.09%	212.03%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-1.436B	-519.0M
YoY Change	-245.34%	-4.95%
NET CHANGE
Cash From Operating Activities	1.912B	1.215B
Cash From Investing Activities	-393.0M	-415.0M
Cash From Financing Activities	-1.436B	-519.0M
Net Change In Cash	83.00M	281.0M
YoY Change	-96.48%	-65.09%
FREE CASH FLOW
Cash From Operating Activities	$1.912B	$1.215B
Capital Expenditures	$73.00M	$80.00M
Free Cash Flow	$1.839B	$1.135B
YoY Change	8.3%	-18.11%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2024Q2	mmc	Fiduciary Liabilities Current FiduciaryLiabilitiesCurrent	11497000000	usd
CY2023Q4	mmc	Fiduciary Liabilities Current FiduciaryLiabilitiesCurrent	10794000000	usd
CY2024Q2	us-gaap	Liabilities Current LiabilitiesCurrent	18864000000	usd
CY2023Q4	us-gaap	Liabilities Current LiabilitiesCurrent	19795000000	usd
CY2024Q2	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	12278000000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	11844000000	usd
CY2024Q2	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	715000000	usd
CY2024Q2	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	1586000000	usd
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	1661000000	usd
CY2024Q2	mmc	Liability For Errors And Omissions LiabilityForErrorsAndOmissions	322000000	usd
CY2023Q4	mmc	Liability For Errors And Omissions LiabilityForErrorsAndOmissions	314000000	usd
CY2024Q2	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1261000000	usd
CY2023Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1267000000	usd
CY2024Q2	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	usd
CY2024Q2	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2023Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2024Q2	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	6000000	shares
CY2023Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	6000000	shares
CY2023Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2024Q2	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2024Q2	us-gaap	Preferred Stock Value PreferredStockValue	0	usd
CY2023Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	usd
CY2024Q2	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1600000000	shares
CY2024Q2	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	560641640	shares
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	560641640	shares
CY2024Q2	us-gaap	Common Stock Value CommonStockValue	561000000	usd
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	561000000	usd
CY2024Q2	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1197000000	usd
CY2023Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1242000000	usd
CY2024Q2	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	24578000000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	22759000000	usd
CY2024Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5527000000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5295000000	usd
CY2024Q2	us-gaap	Minority Interest MinorityInterest	198000000	usd
CY2023Q4	us-gaap	Minority Interest MinorityInterest	179000000	usd
CY2024Q2	mmc	Stockholders Equity Subtotal Before Treasury Stock StockholdersEquitySubtotalBeforeTreasuryStock	21007000000	usd
CY2023Q4	mmc	Stockholders Equity Subtotal Before Treasury Stock StockholdersEquitySubtotalBeforeTreasuryStock	19446000000	usd
CY2024Q2	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	68717711	shares
CY2023Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	68635498	shares
CY2024Q2	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	7442000000	usd
CY2023Q4	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	7076000000	usd
CY2024Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	13565000000	usd
CY2023Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	12370000000	usd
CY2024Q2	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	48591000000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	48030000000	usd
	us-gaap	Profit Loss ProfitLoss	2564000000	usd
	us-gaap	Profit Loss ProfitLoss	2299000000	usd
	us-gaap	Depreciation Depreciation	186000000	usd
	us-gaap	Depreciation Depreciation	175000000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	179000000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	172000000	usd
	mmc	Leases Right Of Use Asset Amortization LeasesRightOfUseAssetAmortization	132000000	usd
	mmc	Leases Right Of Use Asset Amortization LeasesRightOfUseAssetAmortization	143000000	usd
	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	-75000000	usd
	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	-23000000	usd
CY2023Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	12735000000	usd
	mmc	Pensionand Other Postretirement Benefit Contributions In Excessof Current Year Expense PensionandOtherPostretirementBenefitContributionsInExcessofCurrentYearExpense	164000000	usd
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-30000000	usd
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	10000000	usd
	mmc	Increase Decreasein Operating Lease Liabilities IncreaseDecreaseinOperatingLeaseLiabilities	-159000000	usd
CY2023Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	779000000	usd
CY2024Q2	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1600000000	shares
	us-gaap	Gain Loss On Investments GainLossOnInvestments	2000000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	5000000	usd
	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	20000000	usd
	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-19000000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	193000000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	191000000	usd
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	1287000000	usd
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	1029000000	usd
	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	62000000	usd
CY2024Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	6221000000	usd
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	11800000000	usd
CY2024Q2	us-gaap	Interest Expense Nonoperating InterestExpenseNonoperating	156000000	usd
CY2023Q2	us-gaap	Interest Expense Nonoperating InterestExpenseNonoperating	146000000	usd
	us-gaap	Interest Expense Nonoperating InterestExpenseNonoperating	315000000	usd
	us-gaap	Interest Expense Nonoperating InterestExpenseNonoperating	282000000	usd
CY2024Q2	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	11497000000	usd
CY2023Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	10794000000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	2000000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	5000000	usd
	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	20000000	usd
	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-19000000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	193000000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	191000000	usd
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	1287000000	usd
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	1029000000	usd
	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	108000000	usd
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-1226000000	usd
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-1101000000	usd
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	214000000	usd
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	245000000	usd
	mmc	Pensionand Other Postretirement Benefit Contributions In Excessof Current Year Expense PensionandOtherPostretirementBenefitContributionsInExcessofCurrentYearExpense	182000000	usd
	mmc	Increase Decreasein Operating Lease Liabilities IncreaseDecreaseinOperatingLeaseLiabilities	-150000000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	665000000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	600000000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	600000000	usd
	us-gaap	Proceeds From Repayments Of Commercial Paper ProceedsFromRepaymentsOfCommercialPaper	749000000	usd
	us-gaap	Proceeds From Repayments Of Commercial Paper ProceedsFromRepaymentsOfCommercialPaper	308000000	usd
	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	0	usd
	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	200000000	usd
	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	988000000	usd
	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	589000000	usd
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1609000000	usd
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	8000000	usd
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	usd
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	139000000	usd
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	173000000	usd
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	141000000	usd
	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	167000000	usd
	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	120000000	usd
	mmc	Payments For Acquisitions Deferred And Contingent Consideration PaymentsForAcquisitionsDeferredAndContingentConsideration	81000000	usd
	mmc	Payments For Acquisitions Deferred And Contingent Consideration PaymentsForAcquisitionsDeferredAndContingentConsideration	185000000	usd
	mmc	Receipts Of Contingent Consideration For Dispositions ReceiptsOfContingentConsiderationForDispositions	1000000	usd
	mmc	Receipts Of Contingent Consideration For Dispositions ReceiptsOfContingentConsiderationForDispositions	2000000	usd
	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	21000000	usd
	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	10000000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	706000000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	591000000	usd
	mmc	Increase Decrease In Fiduciary Liabilities IncreaseDecreaseInFiduciaryLiabilities	901000000	usd
	mmc	Increase Decrease In Fiduciary Liabilities IncreaseDecreaseInFiduciaryLiabilities	682000000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-384000000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	227000000	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	167000000	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	185000000	usd
	us-gaap	Payments To Acquire Longterm Investments PaymentsToAcquireLongtermInvestments	14000000	usd
	us-gaap	Payments To Acquire Longterm Investments PaymentsToAcquireLongtermInvestments	30000000	usd
	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	14000000	usd
	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	16000000	usd
	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	27000000	usd
	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	-17000000	usd
	mmc	Payment To Acquire Businesses Net Of Cash And Cash Held In A Fiduciary Capacity Acquired PaymentToAcquireBusinessesNetOfCashAndCashHeldInAFiduciaryCapacityAcquired	644000000	usd
	mmc	Payment To Acquire Businesses Net Of Cash And Cash Held In A Fiduciary Capacity Acquired PaymentToAcquireBusinessesNetOfCashAndCashHeldInAFiduciaryCapacityAcquired	292000000	usd
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1000000	usd
	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	108000000	usd
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-1226000000	usd
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-1101000000	usd
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	245000000	usd
	mmc	Increase Decreasein Operating Lease Liabilities IncreaseDecreaseinOperatingLeaseLiabilities	-150000000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	434000000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	665000000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	600000000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	600000000	usd
	us-gaap	Proceeds From Repayments Of Commercial Paper ProceedsFromRepaymentsOfCommercialPaper	749000000	usd
	us-gaap	Proceeds From Repayments Of Commercial Paper ProceedsFromRepaymentsOfCommercialPaper	308000000	usd
	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	0	usd
	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	200000000	usd
	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	988000000	usd
	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	589000000	usd
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1609000000	usd
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	8000000	usd
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	usd
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	139000000	usd
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	173000000	usd
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	141000000	usd
	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	167000000	usd
	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	120000000	usd
	mmc	Payments For Acquisitions Deferred And Contingent Consideration PaymentsForAcquisitionsDeferredAndContingentConsideration	81000000	usd
	mmc	Payments For Acquisitions Deferred And Contingent Consideration PaymentsForAcquisitionsDeferredAndContingentConsideration	185000000	usd
	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	21000000	usd
	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	10000000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	706000000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	591000000	usd
	mmc	Increase Decrease In Fiduciary Liabilities IncreaseDecreaseInFiduciaryLiabilities	901000000	usd
	mmc	Increase Decrease In Fiduciary Liabilities IncreaseDecreaseInFiduciaryLiabilities	682000000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-384000000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	227000000	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	167000000	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	185000000	usd
	us-gaap	Payments To Acquire Longterm Investments PaymentsToAcquireLongtermInvestments	14000000	usd
	us-gaap	Payments To Acquire Longterm Investments PaymentsToAcquireLongtermInvestments	30000000	usd
	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	14000000	usd
	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	16000000	usd
	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	27000000	usd
	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	-17000000	usd
	mmc	Payment To Acquire Businesses Net Of Cash And Cash Held In A Fiduciary Capacity Acquired PaymentToAcquireBusinessesNetOfCashAndCashHeldInAFiduciaryCapacityAcquired	644000000	usd
	mmc	Payment To Acquire Businesses Net Of Cash And Cash Held In A Fiduciary Capacity Acquired PaymentToAcquireBusinessesNetOfCashAndCashHeldInAFiduciaryCapacityAcquired	292000000	usd
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1000000	usd
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-7000000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-783000000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-501000000	usd
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-7000000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-783000000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-501000000	usd
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-269000000	usd
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	242000000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1002000000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	633000000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	14152000000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	12102000000	usd
CY2024Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1653000000	usd
CY2023Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1171000000	usd
CY2024Q2	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	11497000000	usd
CY2023Q2	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	11564000000	usd
CY2024Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	13150000000	usd
CY2024Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	13565000000	usd
CY2023Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	12139000000	usd
CY2024Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	13565000000	usd
CY2023Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	12139000000	usd
CY2024Q2	mmc	Common Stock Dividends Per Share Cash Declared CommonStockDividendsPerShareCashDeclared	0
CY2023Q2	mmc	Common Stock Dividends Per Share Cash Declared CommonStockDividendsPerShareCashDeclared	0
	mmc	Common Stock Dividends Per Share Cash Declared CommonStockDividendsPerShareCashDeclared	1.42
	mmc	Common Stock Dividends Per Share Cash Declared CommonStockDividendsPerShareCashDeclared	1.18
	us-gaap	Nature Of Operations NatureOfOperations	Nature of Operations <div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Marsh & McLennan Companies, Inc., and its consolidated subsidiaries (the "Company"), a global professional services firm, is organized based on the different services that it offers. Under this structure, the Company’s two business segments are Risk and Insurance Services and Consulting.</span></div><div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Risk and Insurance Services segment ("RIS") includes risk management activities (risk advice, risk transfer, and risk control and mitigation solutions) as well as insurance and reinsurance broking and 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. Marsh provides data-driven risk advisory services and insurance solutions to commercial and consumer clients. Guy Carpenter develops advanced risk, reinsurance and capital strategies that help clients grow profitably and pursue emerging opportunities.</span></div>The Consulting segment includes health, wealth and career advice, solutions and products, and specialized management, strategic, economic and brand consulting services. The Company conducts business in this segment through Mercer and Oliver Wyman Group. Mercer delivers advice and technology-driven solutions that help organizations redefine the future of work, reshape retirement and investment outcomes, and unlock health and well-being for a changing workforce. Oliver Wyman Group serves as a critical strategic, economic and brand advisor to private sector and governmental clients
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	segment
CY2024Q2	us-gaap	Restricted Cash Current RestrictedCashCurrent	505000000	usd
CY2023Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	486000000	usd
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-269000000	usd
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	242000000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1002000000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	14152000000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	12102000000	usd
CY2024Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	13150000000	usd
CY2024Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1653000000	usd
CY2023Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1171000000	usd
CY2024Q2	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	11497000000	usd
CY2023Q2	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	11564000000	usd
CY2023Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	12735000000	usd
CY2024Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	13565000000	usd
CY2023Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	12139000000	usd
CY2024Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	13565000000	usd
CY2023Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	12139000000	usd
CY2024Q2	mmc	Common Stock Dividends Per Share Cash Declared CommonStockDividendsPerShareCashDeclared	0
	mmc	Common Stock Dividends Per Share Cash Declared CommonStockDividendsPerShareCashDeclared	1.18
	us-gaap	Nature Of Operations NatureOfOperations	Nature of Operations <div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Marsh & McLennan Companies, Inc., and its consolidated subsidiaries (the "Company"), a global professional services firm, is organized based on the different services that it offers. Under this structure, the Company’s two business segments are Risk and Insurance Services and Consulting.</span></div><div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Risk and Insurance Services segment ("RIS") includes risk management activities (risk advice, risk transfer, and risk control and mitigation solutions) as well as insurance and reinsurance broking and 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. Marsh provides data-driven risk advisory services and insurance solutions to commercial and consumer clients. Guy Carpenter develops advanced risk, reinsurance and capital strategies that help clients grow profitably and pursue emerging opportunities.</span></div>The Consulting segment includes health, wealth and career advice, solutions and products, and specialized management, strategic, economic and brand consulting services. The Company conducts business in this segment through Mercer and Oliver Wyman Group. Mercer delivers advice and technology-driven solutions that help organizations redefine the future of work, reshape retirement and investment outcomes, and unlock health and well-being for a changing workforce. Oliver Wyman Group serves as a critical strategic, economic and brand advisor to private sector and governmental clients
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	segment
CY2024Q2	us-gaap	Restricted Cash Current RestrictedCashCurrent	505000000	usd
CY2023Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	486000000	usd
	mmc	Equity Method Investment Lag Period EquityMethodInvestmentLagPeriod	P3M
CY2024Q2	us-gaap	Gain Loss On Investments GainLossOnInvestments	1000000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	2000000	usd
CY2023Q2	us-gaap	Gain Loss On Investments GainLossOnInvestments	3000000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	5000000	usd
CY2024Q2	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.271
CY2023Q2	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.244
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.254
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.246
CY2024Q2	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.007
CY2023Q2	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.012
	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.016
	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.013
CY2024Q2	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	119000000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	124000000	usd
CY2024Q2	us-gaap	Decrease In Unrecognized Tax Benefits Is Reasonably Possible DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible	66000000	usd
	mmc	Revenue From Contract With Customer Threshold Percentage Of Total Revenue RevenueFromContractWithCustomerThresholdPercentageOfTotalRevenue	0.01
	mmc	Equity Method Investment Lag Period EquityMethodInvestmentLagPeriod	P3M
CY2024Q2	us-gaap	Gain Loss On Investments GainLossOnInvestments	1000000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	2000000	usd
CY2023Q2	us-gaap	Gain Loss On Investments GainLossOnInvestments	3000000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	5000000	usd
CY2024Q2	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.271
CY2023Q2	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.244
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.254
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.246
CY2024Q2	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.007
CY2023Q2	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.012
	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.016
	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.013
CY2024Q2	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	119000000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	124000000	usd
CY2024Q2	us-gaap	Decrease In Unrecognized Tax Benefits Is Reasonably Possible DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible	66000000	usd
	mmc	Revenue From Contract With Customer Threshold Percentage Of Total Revenue RevenueFromContractWithCustomerThresholdPercentageOfTotalRevenue	0.01
CY2024Q2	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	430000000	usd
CY2023Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	357000000	usd
CY2024Q2	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	885000000	usd
CY2023Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	869000000	usd
CY2024Q2	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	266000000	usd
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	581000000	usd
CY2023Q2	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	218000000	usd
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	511000000	usd
CY2024Q2	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	29000000	usd
	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	43000000	usd
CY2023Q2	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	27000000	usd
	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	44000000	usd
CY2024Q2	mmc	Uncollected Premiumsand Claims Netof Related Payables UncollectedPremiumsandClaimsNetofRelatedPayables	16900000000	usd
CY2023Q4	mmc	Uncollected Premiumsand Claims Netof Related Payables UncollectedPremiumsandClaimsNetofRelatedPayables	13800000000	usd
CY2024Q2	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	430000000	usd
CY2023Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	357000000	usd
CY2024Q2	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	885000000	usd
CY2023Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	869000000	usd
CY2024Q2	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	266000000	usd
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	581000000	usd
CY2023Q2	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	218000000	usd
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	511000000	usd
CY2024Q2	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	29000000	usd
	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	43000000	usd
CY2023Q2	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	27000000	usd
	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	44000000	usd
CY2024Q2	mmc	Uncollected Premiumsand Claims Netof Related Payables UncollectedPremiumsandClaimsNetofRelatedPayables	16900000000	usd
CY2023Q4	mmc	Uncollected Premiumsand Claims Netof Related Payables UncollectedPremiumsandClaimsNetofRelatedPayables	13800000000	usd
CY2024Q2	us-gaap	Profit Loss ProfitLoss	1140000000	usd
CY2024Q2	us-gaap	Profit Loss ProfitLoss	1140000000	usd
CY2023Q2	us-gaap	Profit Loss ProfitLoss	1047000000	usd
	us-gaap	Profit Loss ProfitLoss	2564000000	usd
	us-gaap	Profit Loss ProfitLoss	2299000000	usd
CY2024Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	15000000	usd
CY2023Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	12000000	usd
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	39000000	usd
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	29000000	usd
CY2024Q2	us-gaap	Net Income Loss NetIncomeLoss	1125000000	usd
CY2023Q2	us-gaap	Net Income Loss NetIncomeLoss	1035000000	usd
CY2024Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	492000000	shares
CY2023Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	495000000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	492000000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	495000000	shares
CY2024Q2	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	4000000	shares
CY2023Q2	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	4000000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	5000000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	4000000	shares
CY2024Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	496000000	shares
CY2023Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	499000000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	497000000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	499000000	shares
CY2024Q2	mmc	Average Share Price Common Stock AverageSharePriceCommonStock	205.67
CY2023Q2	mmc	Average Share Price Common Stock AverageSharePriceCommonStock	177.33
	mmc	Average Share Price Common Stock AverageSharePriceCommonStock	202.53
	mmc	Average Share Price Common Stock AverageSharePriceCommonStock	172.13
	mmc	Business Combination Consideration Transferred Assets Acquired BusinessCombinationConsiderationTransferredAssetsAcquired	721000000	usd
	mmc	Business Combination Consideration Transferred Assets Acquired BusinessCombinationConsiderationTransferredAssetsAcquired	364000000	usd
	mmc	Business Combination Consideration Transferred Fiduciary Liabilities Assumed BusinessCombinationConsiderationTransferredFiduciaryLiabilitiesAssumed	5000000	usd
	mmc	Business Combination Consideration Transferred Fiduciary Liabilities Assumed BusinessCombinationConsiderationTransferredFiduciaryLiabilitiesAssumed	1000000	usd
	us-gaap	Business Combination Consideration Transferred Liabilities Incurred BusinessCombinationConsiderationTransferredLiabilitiesIncurred	18000000	usd
	us-gaap	Business Combination Consideration Transferred Liabilities Incurred BusinessCombinationConsiderationTransferredLiabilitiesIncurred	63000000	usd
	mmc	Business Combination Contingentand Deferred Consideration BusinessCombinationContingentandDeferredConsideration	54000000	usd
	mmc	Business Combination Contingentand Deferred Consideration BusinessCombinationContingentandDeferredConsideration	8000000	usd
	mmc	Payments To Acquire Businesses Net Of Cash Acquired And Cash Held In A Fiduciary Capacity Acquired PaymentsToAcquireBusinessesNetOfCashAcquiredAndCashHeldInAFiduciaryCapacityAcquired	644000000	usd
	mmc	Payments To Acquire Businesses Net Of Cash Acquired And Cash Held In A Fiduciary Capacity Acquired PaymentsToAcquireBusinessesNetOfCashAcquiredAndCashHeldInAFiduciaryCapacityAcquired	292000000	usd
	us-gaap	Interest Paid Net InterestPaidNet	295000000	usd
	us-gaap	Interest Paid Net InterestPaidNet	245000000	usd
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	658000000	usd
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	504000000	usd
	mmc	Paymentof Contingent Consideration PaymentofContingentConsideration	90000000	usd
	mmc	Paymentof Contingent Consideration PaymentofContingentConsideration	41000000	usd
	mmc	Proceeds From Contingent Consideration Prior Period Dispositions ProceedsFromContingentConsiderationPriorPeriodDispositions	0	usd
	mmc	Proceeds From Contingent Consideration Prior Period Dispositions ProceedsFromContingentConsiderationPriorPeriodDispositions	1000000	usd
	mmc	Fair Value Measurementwith Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Includedin Earnings Net FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedinEarningsNet	-15000000	usd
	mmc	Fair Value Measurementwith Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Includedin Earnings Net FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedinEarningsNet	-17000000	usd
	mmc	Adjustments And Payments Related To Contingent Consideration AdjustmentsAndPaymentsRelatedToContingentConsideration	75000000	usd
	mmc	Adjustments And Payments Related To Contingent Consideration AdjustmentsAndPaymentsRelatedToContingentConsideration	23000000	usd
	mmc	Payments For Previous Acquisition Contingent Consideration PaymentsForPreviousAcquisitionContingentConsideration	71000000	usd
	mmc	Payments For Previous Acquisition Contingent Consideration PaymentsForPreviousAcquisitionContingentConsideration	134000000	usd
	mmc	Payments For Previous Acquisition Deferred Consideration PaymentsForPreviousAcquisitionDeferredConsideration	10000000	usd
	mmc	Payments For Previous Acquisition Deferred Consideration PaymentsForPreviousAcquisitionDeferredConsideration	51000000	usd
	mmc	Payments For Previous Acquisition Deferredand Contingent Consideration PaymentsForPreviousAcquisitionDeferredandContingentConsideration	81000000	usd
CY2023Q2	us-gaap	Profit Loss ProfitLoss	1047000000	usd
	us-gaap	Profit Loss ProfitLoss	2564000000	usd
	us-gaap	Profit Loss ProfitLoss	2299000000	usd
CY2024Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	15000000	usd
CY2023Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	12000000	usd
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	39000000	usd
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	29000000	usd
CY2024Q2	us-gaap	Net Income Loss NetIncomeLoss	1125000000	usd
CY2023Q2	us-gaap	Net Income Loss NetIncomeLoss	1035000000	usd
	us-gaap	Net Income Loss NetIncomeLoss	2525000000	usd
	us-gaap	Net Income Loss NetIncomeLoss	2270000000	usd
CY2024Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	492000000	shares
CY2023Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	495000000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	492000000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	495000000	shares
CY2024Q2	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	4000000	shares
CY2023Q2	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	4000000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	5000000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	4000000	shares
CY2024Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	496000000	shares
CY2023Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	499000000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	497000000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	499000000	shares
CY2024Q2	mmc	Average Share Price Common Stock AverageSharePriceCommonStock	205.67
CY2023Q2	mmc	Average Share Price Common Stock AverageSharePriceCommonStock	177.33
	mmc	Average Share Price Common Stock AverageSharePriceCommonStock	202.53
	mmc	Average Share Price Common Stock AverageSharePriceCommonStock	172.13
	mmc	Business Combination Consideration Transferred Assets Acquired BusinessCombinationConsiderationTransferredAssetsAcquired	721000000	usd
	mmc	Business Combination Consideration Transferred Assets Acquired BusinessCombinationConsiderationTransferredAssetsAcquired	364000000	usd
	mmc	Business Combination Consideration Transferred Fiduciary Liabilities Assumed BusinessCombinationConsiderationTransferredFiduciaryLiabilitiesAssumed	5000000	usd
	mmc	Business Combination Consideration Transferred Fiduciary Liabilities Assumed BusinessCombinationConsiderationTransferredFiduciaryLiabilitiesAssumed	1000000	usd
	us-gaap	Business Combination Consideration Transferred Liabilities Incurred BusinessCombinationConsiderationTransferredLiabilitiesIncurred	18000000	usd
	mmc	Business Combination Contingentand Deferred Consideration BusinessCombinationContingentandDeferredConsideration	54000000	usd
	mmc	Business Combination Contingentand Deferred Consideration BusinessCombinationContingentandDeferredConsideration	8000000	usd
	mmc	Payments To Acquire Businesses Net Of Cash Acquired And Cash Held In A Fiduciary Capacity Acquired PaymentsToAcquireBusinessesNetOfCashAcquiredAndCashHeldInAFiduciaryCapacityAcquired	644000000	usd
	mmc	Payments To Acquire Businesses Net Of Cash Acquired And Cash Held In A Fiduciary Capacity Acquired PaymentsToAcquireBusinessesNetOfCashAcquiredAndCashHeldInAFiduciaryCapacityAcquired	292000000	usd
	us-gaap	Interest Paid Net InterestPaidNet	295000000	usd
	us-gaap	Interest Paid Net InterestPaidNet	245000000	usd
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	658000000	usd
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	504000000	usd
	mmc	Paymentof Contingent Consideration PaymentofContingentConsideration	90000000	usd
	mmc	Paymentof Contingent Consideration PaymentofContingentConsideration	41000000	usd
	mmc	Proceeds From Contingent Consideration Prior Period Dispositions ProceedsFromContingentConsiderationPriorPeriodDispositions	0	usd
	mmc	Proceeds From Contingent Consideration Prior Period Dispositions ProceedsFromContingentConsiderationPriorPeriodDispositions	1000000	usd
	mmc	Fair Value Measurementwith Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Includedin Earnings Net FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedinEarningsNet	-15000000	usd
	mmc	Fair Value Measurementwith Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Includedin Earnings Net FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedinEarningsNet	-17000000	usd
	mmc	Adjustments And Payments Related To Contingent Consideration AdjustmentsAndPaymentsRelatedToContingentConsideration	75000000	usd
	mmc	Adjustments And Payments Related To Contingent Consideration AdjustmentsAndPaymentsRelatedToContingentConsideration	23000000	usd
	mmc	Payments For Previous Acquisition Contingent Consideration PaymentsForPreviousAcquisitionContingentConsideration	71000000	usd
	mmc	Payments For Previous Acquisition Contingent Consideration PaymentsForPreviousAcquisitionContingentConsideration	134000000	usd
	mmc	Payments For Previous Acquisition Deferred Consideration PaymentsForPreviousAcquisitionDeferredConsideration	10000000	usd
	mmc	Payments For Previous Acquisition Deferred Consideration PaymentsForPreviousAcquisitionDeferredConsideration	51000000	usd
	mmc	Payments For Previous Acquisition Deferredand Contingent Consideration PaymentsForPreviousAcquisitionDeferredandContingentConsideration	81000000	usd
	mmc	Payments For Previous Acquisition Deferredand Contingent Consideration PaymentsForPreviousAcquisitionDeferredandContingentConsideration	185000000	usd
	mmc	Proceeds From Previous Disposition Contingent Consideration ProceedsFromPreviousDispositionContingentConsideration	1000000	usd
	mmc	Proceeds From Previous Disposition Contingent Consideration ProceedsFromPreviousDispositionContingentConsideration	2000000	usd
	us-gaap	Stock Issued1 StockIssued1	321000000	usd
	us-gaap	Stock Issued1 StockIssued1	296000000	usd
CY2024Q2	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	90000000	usd
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	193000000	usd
CY2023Q2	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	92000000	usd
CY2024Q2	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-10000000	usd
CY2024Q2	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	8000000	usd
CY2024Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-18000000	usd
CY2023Q2	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	161000000	usd
CY2023Q2	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-18000000	usd
CY2023Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	179000000	usd
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-204000000	usd
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	28000000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-232000000	usd
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	222000000	usd
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-37000000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	259000000	usd
	us-gaap	Business Combination Consideration Transferred1 BusinessCombinationConsiderationTransferred1	716000000	usd
	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	662000000	usd
	mmc	Business Combination Contingentand Deferred Consideration BusinessCombinationContingentandDeferredConsideration	54000000	usd
	mmc	Payments For Previous Acquisition Deferred Consideration PaymentsForPreviousAcquisitionDeferredConsideration	10000000	usd
	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	215000000	usd
	us-gaap	Business Combination Consideration Transferred1 BusinessCombinationConsiderationTransferred1	340000000	usd
	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	332000000	usd
	mmc	Business Combination Contingentand Deferred Consideration BusinessCombinationContingentandDeferredConsideration	8000000	usd
CY2023Q1	mmc	Contingent Consideration Fiduciary Cash And Cash Equivalents Held ContingentConsiderationFiduciaryCashAndCashEquivalentsHeld	20000000	usd
CY2023Q2	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	139000000	usd
	mmc	Payments For Previous Acquisition Deferredand Contingent Consideration PaymentsForPreviousAcquisitionDeferredandContingentConsideration	185000000	usd
	mmc	Proceeds From Previous Disposition Contingent Consideration ProceedsFromPreviousDispositionContingentConsideration	1000000	usd
	mmc	Proceeds From Previous Disposition Contingent Consideration ProceedsFromPreviousDispositionContingentConsideration	2000000	usd
CY2024Q2	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	90000000	usd
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	193000000	usd
CY2023Q2	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	92000000	usd
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	191000000	usd
CY2024Q2	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-10000000	usd
CY2024Q2	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	8000000	usd
CY2024Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-18000000	usd
CY2023Q2	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	161000000	usd
CY2023Q2	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-18000000	usd
CY2023Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	179000000	usd
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-204000000	usd
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	28000000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-232000000	usd
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	222000000	usd
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-37000000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	259000000	usd
	us-gaap	Business Combination Consideration Transferred1 BusinessCombinationConsiderationTransferred1	716000000	usd
	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	662000000	usd
	mmc	Payments For Previous Acquisition Deferred Consideration PaymentsForPreviousAcquisitionDeferredConsideration	10000000	usd
	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	215000000	usd
	us-gaap	Business Combination Consideration Transferred1 BusinessCombinationConsiderationTransferred1	340000000	usd
	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	332000000	usd
	mmc	Business Combination Contingentand Deferred Consideration BusinessCombinationContingentandDeferredConsideration	8000000	usd
CY2023Q1	mmc	Contingent Consideration Fiduciary Cash And Cash Equivalents Held ContingentConsiderationFiduciaryCashAndCashEquivalentsHeld	20000000	usd
CY2023Q2	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	139000000	usd
CY2024Q2	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	6234000000	usd
CY2023Q2	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	5989000000	usd
	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	12756000000	usd
	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	12060000000	usd
CY2023Q2	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	1065000000	usd
	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	2546000000	usd
	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	2317000000	usd
CY2024Q2	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Basic BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic	2.31
CY2023Q2	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Basic BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic	2.15
	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Basic BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic	5.17
	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Basic BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic	4.68
CY2024Q2	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Diluted BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted	2.29
CY2023Q2	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Diluted BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted	2.13
	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Diluted BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted	5.13
	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Diluted BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted	4.64
CY2023Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	0	usd
CY2024Q2	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	0	usd
CY2023Q4	us-gaap	Goodwill Goodwill	17231000000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	16251000000	usd
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	430000000	usd
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	236000000	usd
	us-gaap	Goodwill Other Increase Decrease GoodwillOtherIncreaseDecrease	-145000000	usd
	us-gaap	Goodwill Other Increase Decrease GoodwillOtherIncreaseDecrease	134000000	usd
CY2024Q2	us-gaap	Goodwill Goodwill	17516000000	usd
CY2023Q2	us-gaap	Goodwill Goodwill	16621000000	usd
CY2024Q2	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	6234000000	usd
CY2023Q2	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	5989000000	usd
	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	12756000000	usd
	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	12060000000	usd
CY2024Q2	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	1135000000	usd
CY2023Q2	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	1065000000	usd
	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	2546000000	usd
	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	2317000000	usd
CY2024Q2	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Basic BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic	2.31
CY2023Q2	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Basic BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic	2.15
	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Basic BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic	5.17
	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Basic BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic	4.68
CY2024Q2	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Diluted BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted	2.29
CY2023Q2	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Diluted BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted	2.13
	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Diluted BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted	5.13
	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Diluted BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted	4.64
CY2023Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	0	usd
CY2024Q2	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	0	usd
CY2023Q4	us-gaap	Goodwill Goodwill	17231000000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	16251000000	usd
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	430000000	usd
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	236000000	usd
	us-gaap	Goodwill Other Increase Decrease GoodwillOtherIncreaseDecrease	-145000000	usd
	us-gaap	Goodwill Other Increase Decrease GoodwillOtherIncreaseDecrease	134000000	usd
CY2024Q2	us-gaap	Goodwill Goodwill	17516000000	usd
CY2023Q2	us-gaap	Goodwill Goodwill	16621000000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	4874000000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	2236000000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	2638000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	4728000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	2098000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	2630000000	usd
CY2024Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	89000000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	179000000	usd
CY2023Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	87000000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	172000000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	174000000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	322000000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	301000000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	293000000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	271000000	usd
CY2024Q2	mmc	Finite Lived Intangible Asset Expected Amortizationafter Year Four FiniteLivedIntangibleAssetExpectedAmortizationafterYearFour	1277000000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	2638000000	usd
CY2024Q2	us-gaap	Equity Method Investments EquityMethodInvestments	276000000	usd
CY2023Q4	us-gaap	Equity Method Investments EquityMethodInvestments	266000000	usd
CY2024Q2	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	19000000	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	16000000	usd
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	2000000	usd
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	1000000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	4874000000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	2236000000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	2638000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	4728000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	2098000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	2630000000	usd
CY2024Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	89000000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	179000000	usd
CY2023Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	87000000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	172000000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	174000000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	322000000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	301000000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	293000000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	271000000	usd
CY2024Q2	mmc	Finite Lived Intangible Asset Expected Amortizationafter Year Four FiniteLivedIntangibleAssetExpectedAmortizationafterYearFour	1277000000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	2638000000	usd
CY2024Q2	us-gaap	Equity Method Investments EquityMethodInvestments	276000000	usd
CY2023Q4	us-gaap	Equity Method Investments EquityMethodInvestments	266000000	usd
CY2024Q2	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	19000000	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	16000000	usd
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	2000000	usd
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	1000000	usd
CY2024Q2	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	20000000	usd
CY2023Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	20000000	usd
	mmc	Net Investment Hedge Threshold Percentageofthe Equity Balance NetInvestmentHedgeThresholdPercentageoftheEquityBalance	0.80
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax	-47000000	usd
CY2024Q2	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	1000000	usd
	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	2000000	usd
CY2023Q2	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	5000000	usd
	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	13000000	usd
CY2024Q2	us-gaap	Operating Lease Cost OperatingLeaseCost	81000000	usd
CY2023Q2	us-gaap	Operating Lease Cost OperatingLeaseCost	81000000	usd
	us-gaap	Operating Lease Cost OperatingLeaseCost	163000000	usd
	us-gaap	Operating Lease Cost OperatingLeaseCost	161000000	usd
CY2024Q2	us-gaap	Short Term Lease Cost ShortTermLeaseCost	2000000	usd
CY2023Q2	us-gaap	Short Term Lease Cost ShortTermLeaseCost	2000000	usd
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	3000000	usd
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	3000000	usd
CY2024Q2	us-gaap	Variable Lease Cost VariableLeaseCost	28000000	usd
CY2023Q2	us-gaap	Variable Lease Cost VariableLeaseCost	26000000	usd
	us-gaap	Variable Lease Cost VariableLeaseCost	54000000	usd
	us-gaap	Variable Lease Cost VariableLeaseCost	63000000	usd
CY2024Q2	us-gaap	Sublease Income SubleaseIncome	5000000	usd
CY2023Q2	us-gaap	Sublease Income SubleaseIncome	2000000	usd
	us-gaap	Sublease Income SubleaseIncome	8000000	usd
	us-gaap	Sublease Income SubleaseIncome	6000000	usd
CY2024Q2	us-gaap	Lease Cost LeaseCost	106000000	usd
CY2023Q2	us-gaap	Lease Cost LeaseCost	107000000	usd
	us-gaap	Lease Cost LeaseCost	212000000	usd
	us-gaap	Lease Cost LeaseCost	221000000	usd
	us-gaap	Operating Lease Payments OperatingLeasePayments	183000000	usd
	us-gaap	Operating Lease Payments OperatingLeasePayments	189000000	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	85000000	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	121000000	usd
CY2024Q2	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y9M18D
CY2023Q2	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y3M18D
CY2024Q2	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0358
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Files In Submission

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0000062709-24-000071-index.html	Edgar Link	pending
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report.css	Edgar Link	pending
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$MMC
MARSH & MCLENNAN COMPANIES, INC. Stock $mmc

2024 Q3 Form 10-Q Financial Statement

#000006270924000071 Filed on July 18, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MMC MARSH & MCLENNAN COMPANIES, INC. Stock $mmc

2024 Q3 Form 10-Q Financial Statement

#000006270924000071 Filed on July 18, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MMC
MARSH & MCLENNAN COMPANIES, INC. Stock $mmc