{"schemaVersion":"edgar.public-analysis.v1","calculationVersion":"analysis-v1.4:context-v3","mappingVersion":"analysis-mappings-v2","status":"ready","ticker":"BIIB","cik":"0000875045","name":"BIOGEN INC.","lens":"corporate","businessModel":"corporate","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":"2026-09-27T03:45:04.914Z","retrievedAt":"2026-09-13T08:09:16.833Z","calculatedAt":"2026-09-19T03:20:09.870Z","freshUntil":"2026-09-28T04:45:04.914Z","stale":false,"metrics":[{"key":"revenue","label":"Revenue","format":"currency","unit":"USD","value":9890600000,"classification":"reported","formula":null,"observationPeriod":{"kind":"duration","start":"2025-01-01","end":"2025-12-31"},"reason":null,"sourceIds":[0],"calculations":[],"previous":{"value":9675900000,"classification":"reported","formula":null,"observationPeriod":{"kind":"duration","start":"2024-01-01","end":"2024-12-31"},"reason":null,"sourceIds":[1],"calculations":[]},"change":{"delta":214700000,"percent":2.21891503632737,"reason":null}},{"key":"netIncome","label":"Net Income","format":"currency","unit":"USD","value":1292900000,"classification":"reported","formula":null,"observationPeriod":{"kind":"duration","start":"2025-01-01","end":"2025-12-31"},"reason":null,"sourceIds":[2],"calculations":[],"previous":{"value":1632200000,"classification":"reported","formula":null,"observationPeriod":{"kind":"duration","start":"2024-01-01","end":"2024-12-31"},"reason":null,"sourceIds":[3],"calculations":[]},"change":{"delta":-339300000,"percent":-20.787893640485237,"reason":null}},{"key":"operatingMargin","label":"Operating margin","format":"percent","unit":"%","value":null,"classification":"unavailable","formula":null,"observationPeriod":{"kind":"annual","start":"2025-01-01","end":"2025-12-31","fiscalYear":2025,"fiscalPeriod":"FY"},"reason":"A reported or calculated value is unavailable.","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":"A reported or calculated value is unavailable.","sourceIds":[],"calculations":[]},"change":{"delta":null,"percent":null,"reason":"Both periods require compatible reported inputs."}},{"key":"operatingCashFlow","label":"Operating Cash Flow","format":"currency","unit":"USD","value":2204600000,"classification":"reported","formula":null,"observationPeriod":{"kind":"duration","start":"2025-01-01","end":"2025-12-31"},"reason":null,"sourceIds":[4],"calculations":[],"previous":{"value":2875500000,"classification":"reported","formula":null,"observationPeriod":{"kind":"duration","start":"2024-01-01","end":"2024-12-31"},"reason":null,"sourceIds":[5],"calculations":[]},"change":{"delta":-670900000,"percent":-23.33159450530343,"reason":null}},{"key":"freeCashFlow","label":"Free cash flow","format":"currency","unit":"USD","value":2050800000,"classification":"calculated","formula":"Operating cash flow − reported purchases of property, plant and equipment","observationPeriod":{"kind":"duration","start":"2025-01-01","end":"2025-12-31"},"reason":null,"sourceIds":[4,6],"calculations":[],"previous":{"value":2721800000,"classification":"calculated","formula":"Operating cash flow − reported purchases of property, plant and equipment","observationPeriod":{"kind":"duration","start":"2024-01-01","end":"2024-12-31"},"reason":null,"sourceIds":[5,7],"calculations":[]},"change":{"delta":-671000000,"percent":-24.652803291939158,"reason":null}},{"key":"roe","label":"Return on average equity","format":"percent","unit":"%","value":7.3937459968890105,"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":[2,8,9],"calculations":[],"previous":{"value":10.358110637973816,"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":[3,9,10],"calculations":[]},"change":{"delta":-2.9643646410848055,"percent":null,"reason":null}}],"sourceCatalog":[{"taxonomy":"us-gaap","tag":"Revenues","unit":"USD","start":"2025-01-01","end":"2025-12-31","value":9890600000,"accession":"0000875045-26-000013","filed":"2026-02-06","form":"10-K","url":"https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/biib-20251231.htm","revised":false},{"taxonomy":"us-gaap","tag":"Revenues","unit":"USD","start":"2024-01-01","end":"2024-12-31","value":9675900000,"accession":"0000875045-26-000013","filed":"2026-02-06","form":"10-K","url":"https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/biib-20251231.htm","revised":false},{"taxonomy":"us-gaap","tag":"NetIncomeLoss","unit":"USD","start":"2025-01-01","end":"2025-12-31","value":1292900000,"accession":"0000875045-26-000013","filed":"2026-02-06","form":"10-K","url":"https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/biib-20251231.htm","revised":false},{"taxonomy":"us-gaap","tag":"NetIncomeLoss","unit":"USD","start":"2024-01-01","end":"2024-12-31","value":1632200000,"accession":"0000875045-26-000013","filed":"2026-02-06","form":"10-K","url":"https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/biib-20251231.htm","revised":false},{"taxonomy":"us-gaap","tag":"NetCashProvidedByUsedInOperatingActivities","unit":"USD","start":"2025-01-01","end":"2025-12-31","value":2204600000,"accession":"0000875045-26-000013","filed":"2026-02-06","form":"10-K","url":"https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/biib-20251231.htm","revised":false},{"taxonomy":"us-gaap","tag":"NetCashProvidedByUsedInOperatingActivities","unit":"USD","start":"2024-01-01","end":"2024-12-31","value":2875500000,"accession":"0000875045-26-000013","filed":"2026-02-06","form":"10-K","url":"https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/biib-20251231.htm","revised":false},{"taxonomy":"us-gaap","tag":"PaymentsToAcquirePropertyPlantAndEquipment","unit":"USD","start":"2025-01-01","end":"2025-12-31","value":153800000,"accession":"0000875045-26-000013","filed":"2026-02-06","form":"10-K","url":"https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/biib-20251231.htm","revised":false},{"taxonomy":"us-gaap","tag":"PaymentsToAcquirePropertyPlantAndEquipment","unit":"USD","start":"2024-01-01","end":"2024-12-31","value":153700000,"accession":"0000875045-26-000013","filed":"2026-02-06","form":"10-K","url":"https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/biib-20251231.htm","revised":false},{"taxonomy":"us-gaap","tag":"StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","unit":"USD","start":null,"end":"2025-12-31","value":18256800000,"accession":"0000875045-26-000045","filed":"2026-04-29","form":"10-Q","url":"https://www.sec.gov/Archives/edgar/data/875045/000087504526000045/biib-20260331.htm","revised":false},{"taxonomy":"us-gaap","tag":"StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest","unit":"USD","start":null,"end":"2024-12-31","value":16716000000,"accession":"0000875045-26-000045","filed":"2026-04-29","form":"10-Q","url":"https://www.sec.gov/Archives/edgar/data/875045/000087504526000045/biib-20260331.htm","revised":false},{"taxonomy":"us-gaap","tag":"StockholdersEquity","unit":"USD","start":null,"end":"2023-12-31","value":14799400000,"accession":"0000875045-24-000009","filed":"2024-02-14","form":"10-K","url":"https://www.sec.gov/Archives/edgar/data/875045/000087504524000009/biib-20231231.htm","revised":false}],"coverage":{"displayedMetrics":6,"availableMetrics":5,"reportedMetrics":3,"calculatedMetrics":2,"comparableMetrics":5,"sourceCount":11,"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/BIIB#analysis-workspace","summaryUrl":"/api/v1/analysis/BIIB"}