{"schemaVersion":"edgar.public-analysis.v1","calculationVersion":"analysis-v1.4:context-v3","mappingVersion":"analysis-mappings-v2","status":"ready","ticker":"MRSH","cik":"0000062709","name":"MARSH & MCLENNAN COMPANIES, INC.","lens":"insurance","businessModel":"insurance","basis":"annual","asOf":"","selectedEnd":"latest","period":{"kind":"annual","start":"2025-01-01","end":"2025-12-31","fiscalYear":2025,"fiscalPeriod":"FY"},"comparisonPeriod":{"kind":"annual","start":"2024-01-01","end":"2024-12-31","fiscalYear":2024,"fiscalPeriod":"FY"},"checkedAt":"2026-09-27T05:05:53.126Z","retrievedAt":"2026-09-13T08:01:10.236Z","calculatedAt":"2026-09-23T04:10:53.554Z","freshUntil":"2026-09-28T06:05:53.126Z","stale":false,"metrics":[{"key":"premiumsEarned","label":"Net premiums earned","format":"currency","unit":"USD","value":null,"classification":"unavailable","formula":null,"observationPeriod":{"kind":"annual","start":"2025-01-01","end":"2025-12-31","fiscalYear":2025,"fiscalPeriod":"FY"},"reason":"No compatible context in the requested unit and reporting period.","sourceIds":[],"calculations":[],"previous":{"value":null,"classification":"unavailable","formula":null,"observationPeriod":{"kind":"annual","start":"2024-01-01","end":"2024-12-31","fiscalYear":2024,"fiscalPeriod":"FY"},"reason":"No compatible context in the requested unit and reporting period.","sourceIds":[],"calculations":[]},"change":{"delta":null,"percent":null,"reason":"Both periods require compatible reported inputs."}},{"key":"investmentIncome","label":"Investment income","format":"currency","unit":"USD","value":null,"classification":"unavailable","formula":null,"observationPeriod":{"kind":"annual","start":"2025-01-01","end":"2025-12-31","fiscalYear":2025,"fiscalPeriod":"FY"},"reason":"No compatible context in the requested unit and reporting period.","sourceIds":[],"calculations":[],"previous":{"value":null,"classification":"unavailable","formula":null,"observationPeriod":{"kind":"annual","start":"2024-01-01","end":"2024-12-31","fiscalYear":2024,"fiscalPeriod":"FY"},"reason":"No compatible context in the requested unit and reporting period.","sourceIds":[],"calculations":[]},"change":{"delta":null,"percent":null,"reason":"Both periods require compatible reported inputs."}},{"key":"netIncome","label":"Net Income","format":"currency","unit":"USD","value":4160000000,"classification":"reported","formula":null,"observationPeriod":{"kind":"duration","start":"2025-01-01","end":"2025-12-31"},"reason":null,"sourceIds":[0],"calculations":[],"previous":{"value":4060000000,"classification":"reported","formula":null,"observationPeriod":{"kind":"duration","start":"2024-01-01","end":"2024-12-31"},"reason":null,"sourceIds":[1],"calculations":[]},"change":{"delta":100000000,"percent":2.4630541871921183,"reason":null}},{"key":"roe","label":"Return on average equity","format":"percent","unit":"%","value":28.838821490467936,"classification":"calculated","formula":"Net income / average beginning and ending equity × annualization factor × 100","observationPeriod":{"kind":"duration","start":"2025-01-01","end":"2025-12-31"},"reason":null,"sourceIds":[0,2,3],"calculations":[],"previous":{"value":31.34530013510905,"classification":"calculated","formula":"Net income / average beginning and ending equity × annualization factor × 100","observationPeriod":{"kind":"duration","start":"2024-01-01","end":"2024-12-31"},"reason":null,"sourceIds":[1,3,4],"calculations":[]},"change":{"delta":-2.5064786446411134,"percent":null,"reason":null}},{"key":"equityAssets","label":"Equity / assets","format":"percent","unit":"%","value":26.085845682166582,"classification":"calculated","formula":"Equity / total assets × 100","observationPeriod":{"kind":"instant","start":null,"end":"2025-12-31"},"reason":null,"sourceIds":[2,5],"calculations":[],"previous":{"value":23.963810839043216,"classification":"calculated","formula":"Equity / total assets × 100","observationPeriod":{"kind":"instant","start":null,"end":"2024-12-31"},"reason":null,"sourceIds":[3,6],"calculations":[]},"change":{"delta":2.122034843123366,"percent":null,"reason":null}},{"key":"cashAssets","label":"Cash / assets","format":"percent","unit":"%","value":4.576733094873106,"classification":"calculated","formula":"Reported cash / total assets × 100","observationPeriod":{"kind":"instant","start":null,"end":"2025-12-31"},"reason":null,"sourceIds":[7,5],"calculations":[],"previous":{"value":4.245675536906216,"classification":"calculated","formula":"Reported cash / total assets × 100","observationPeriod":{"kind":"instant","start":null,"end":"2024-12-31"},"reason":null,"sourceIds":[8,6],"calculations":[]},"change":{"delta":0.33105755796688996,"percent":null,"reason":null}}],"sourceCatalog":[{"taxonomy":"us-gaap","tag":"NetIncomeLoss","unit":"USD","start":"2025-01-01","end":"2025-12-31","value":4160000000,"accession":"0000062709-26-000022","filed":"2026-02-09","form":"10-K","url":"https://www.sec.gov/Archives/edgar/data/62709/000006270926000022/mrsh-20251231.htm","revised":false},{"taxonomy":"us-gaap","tag":"NetIncomeLoss","unit":"USD","start":"2024-01-01","end":"2024-12-31","value":4060000000,"accession":"0000062709-26-000022","filed":"2026-02-09","form":"10-K","url":"https://www.sec.gov/Archives/edgar/data/62709/000006270926000022/mrsh-20251231.htm","revised":false},{"taxonomy":"us-gaap","tag":"StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","unit":"USD","start":null,"end":"2025-12-31","value":15315000000,"accession":"0000062709-26-000195","filed":"2026-07-21","form":"10-Q","url":"https://www.sec.gov/Archives/edgar/data/62709/000006270926000195/mrsh-20260630.htm","revised":false},{"taxonomy":"us-gaap","tag":"StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","unit":"USD","start":null,"end":"2024-12-31","value":13535000000,"accession":"0000062709-26-000022","filed":"2026-02-09","form":"10-K","url":"https://www.sec.gov/Archives/edgar/data/62709/000006270926000022/mrsh-20251231.htm","revised":false},{"taxonomy":"us-gaap","tag":"StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","unit":"USD","start":null,"end":"2023-12-31","value":12370000000,"accession":"0000062709-26-000022","filed":"2026-02-09","form":"10-K","url":"https://www.sec.gov/Archives/edgar/data/62709/000006270926000022/mrsh-20251231.htm","revised":false},{"taxonomy":"us-gaap","tag":"Assets","unit":"USD","start":null,"end":"2025-12-31","value":58710000000,"accession":"0000062709-26-000195","filed":"2026-07-21","form":"10-Q","url":"https://www.sec.gov/Archives/edgar/data/62709/000006270926000195/mrsh-20260630.htm","revised":false},{"taxonomy":"us-gaap","tag":"Assets","unit":"USD","start":null,"end":"2024-12-31","value":56481000000,"accession":"0000062709-26-000022","filed":"2026-02-09","form":"10-K","url":"https://www.sec.gov/Archives/edgar/data/62709/000006270926000022/mrsh-20251231.htm","revised":false},{"taxonomy":"us-gaap","tag":"CashAndCashEquivalentsAtCarryingValue","unit":"USD","start":null,"end":"2025-12-31","value":2687000000,"accession":"0000062709-26-000195","filed":"2026-07-21","form":"10-Q","url":"https://www.sec.gov/Archives/edgar/data/62709/000006270926000195/mrsh-20260630.htm","revised":false},{"taxonomy":"us-gaap","tag":"CashAndCashEquivalentsAtCarryingValue","unit":"USD","start":null,"end":"2024-12-31","value":2398000000,"accession":"0000062709-26-000022","filed":"2026-02-09","form":"10-K","url":"https://www.sec.gov/Archives/edgar/data/62709/000006270926000022/mrsh-20251231.htm","revised":false}],"coverage":{"displayedMetrics":6,"availableMetrics":4,"reportedMetrics":1,"calculatedMetrics":3,"comparableMetrics":4,"sourceCount":9,"sourceInputsOmitted":0,"preparedHistoryPeriods":11},"limitations":["Normalized standard SEC XBRL concepts, not a complete reproduction of the filed financial statements. Missing values are not zero.","Values are unscaled USD, reported per-share units, percentages or ratios as labeled. Balance-sheet inputs are point-in-time observations; income and cash-flow inputs cover their stated durations.","The latest filed values in the prepared model are used, including subsequent comparative revisions. Selecting an older reporting end does not create an as-filed historical vintage.","Year-over-year changes require compatible periods. Percentage growth is not calculated from a zero or negative base; percentage-valued metrics change in percentage points.","Reported inputs, calculated metrics and source-check dates remain separate. CFTC positioning, market prices and personal research assumptions are outside this summary."],"interactiveUrl":"/analysis/MRSH#analysis-workspace","summaryUrl":"/api/v1/analysis/MRSH"}