{
 "ticker": "BIIB",
 "name": "Biogen Inc.",
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   "period_end": "2013-12-31",
   "sec_frame": "CY2013",
   "value": 1862300000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504516000042/",
   "accession": "0000875045-16-000042"
  },
  {
   "fy": 2014,
   "period_end": "2014-12-31",
   "sec_frame": "CY2014",
   "value": 2934800000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504517000009/",
   "accession": "0000875045-17-000009"
  },
  {
   "fy": 2015,
   "period_end": "2015-12-31",
   "sec_frame": "CY2015",
   "value": 3547000000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504518000005/",
   "accession": "0000875045-18-000005"
  },
  {
   "fy": 2016,
   "period_end": "2016-12-31",
   "sec_frame": "CY2016",
   "value": 3702800000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504519000006/",
   "accession": "0000875045-19-000006"
  },
  {
   "fy": 2017,
   "period_end": "2017-12-31",
   "sec_frame": "CY2017",
   "value": 2539100000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504520000005/",
   "accession": "0000875045-20-000005"
  },
  {
   "fy": 2018,
   "period_end": "2018-12-31",
   "sec_frame": "CY2018",
   "value": 4430700000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504521000010/",
   "accession": "0000875045-21-000010"
  },
  {
   "fy": 2019,
   "period_end": "2019-12-31",
   "sec_frame": "CY2019",
   "value": 5888500000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504522000007/",
   "accession": "0000875045-22-000007"
  },
  {
   "fy": 2020,
   "period_end": "2020-12-31",
   "sec_frame": "CY2020",
   "value": 4000600000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504523000009/",
   "accession": "0000875045-23-000009"
  },
  {
   "fy": 2021,
   "period_end": "2021-12-31",
   "sec_frame": "CY2021",
   "value": 1556100000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504524000009/",
   "accession": "0000875045-24-000009"
  },
  {
   "fy": 2022,
   "period_end": "2022-12-31",
   "sec_frame": "CY2022",
   "value": 3046900000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504525000009/",
   "accession": "0000875045-25-000009"
  },
  {
   "fy": 2023,
   "period_end": "2023-12-31",
   "sec_frame": "CY2023",
   "value": 1161100000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/",
   "accession": "0000875045-26-000013"
  },
  {
   "fy": 2024,
   "period_end": "2024-12-31",
   "sec_frame": "CY2024",
   "value": 1632200000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/",
   "accession": "0000875045-26-000013"
  },
  {
   "fy": 2025,
   "period_end": "2025-12-31",
   "sec_frame": "CY2025",
   "value": 1292900000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/",
   "accession": "0000875045-26-000013"
  }
 ],
 "eps_diluted_by_fy": [
  {
   "fy": 2013,
   "period_end": "2013-12-31",
   "sec_frame": "CY2013",
   "value": 7.81,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504516000042/",
   "accession": "0000875045-16-000042",
   "value_reported": 7.81,
   "split_factor": 1.0,
   "split_basis": "filed 2016-02-03"
  },
  {
   "fy": 2014,
   "period_end": "2014-12-31",
   "sec_frame": "CY2014",
   "value": 12.37,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504517000009/",
   "accession": "0000875045-17-000009",
   "value_reported": 12.37,
   "split_factor": 1.0,
   "split_basis": "filed 2017-02-02"
  },
  {
   "fy": 2015,
   "period_end": "2015-12-31",
   "sec_frame": "CY2015",
   "value": 15.34,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504518000005/",
   "accession": "0000875045-18-000005",
   "value_reported": 15.34,
   "split_factor": 1.0,
   "split_basis": "filed 2018-02-01"
  },
  {
   "fy": 2016,
   "period_end": "2016-12-31",
   "sec_frame": "CY2016",
   "value": 16.93,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504519000006/",
   "accession": "0000875045-19-000006",
   "value_reported": 16.93,
   "split_factor": 1.0,
   "split_basis": "filed 2019-02-06"
  },
  {
   "fy": 2017,
   "period_end": "2017-12-31",
   "sec_frame": "CY2017",
   "value": 11.92,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504520000005/",
   "accession": "0000875045-20-000005",
   "value_reported": 11.92,
   "split_factor": 1.0,
   "split_basis": "filed 2020-02-06"
  },
  {
   "fy": 2018,
   "period_end": "2018-12-31",
   "sec_frame": "CY2018",
   "value": 21.58,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504521000010/",
   "accession": "0000875045-21-000010",
   "value_reported": 21.58,
   "split_factor": 1.0,
   "split_basis": "filed 2021-02-03"
  },
  {
   "fy": 2019,
   "period_end": "2019-12-31",
   "sec_frame": "CY2019",
   "value": 31.42,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504522000007/",
   "accession": "0000875045-22-000007",
   "value_reported": 31.42,
   "split_factor": 1.0,
   "split_basis": "filed 2022-02-03"
  },
  {
   "fy": 2020,
   "period_end": "2020-12-31",
   "sec_frame": "CY2020",
   "value": 24.8,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504523000009/",
   "accession": "0000875045-23-000009",
   "value_reported": 24.8,
   "split_factor": 1.0,
   "split_basis": "filed 2023-02-15"
  },
  {
   "fy": 2021,
   "period_end": "2021-12-31",
   "sec_frame": "CY2021",
   "value": 10.4,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504524000009/",
   "accession": "0000875045-24-000009",
   "value_reported": 10.4,
   "split_factor": 1.0,
   "split_basis": "filed 2024-02-14"
  },
  {
   "fy": 2022,
   "period_end": "2022-12-31",
   "sec_frame": "CY2022",
   "value": 20.87,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504525000009/",
   "accession": "0000875045-25-000009",
   "value_reported": 20.87,
   "split_factor": 1.0,
   "split_basis": "filed 2025-02-12"
  },
  {
   "fy": 2023,
   "period_end": "2023-12-31",
   "sec_frame": "CY2023",
   "value": 7.97,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/",
   "accession": "0000875045-26-000013",
   "value_reported": 7.97,
   "split_factor": 1.0,
   "split_basis": "filed 2026-02-06"
  },
  {
   "fy": 2024,
   "period_end": "2024-12-31",
   "sec_frame": "CY2024",
   "value": 11.18,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/",
   "accession": "0000875045-26-000013",
   "value_reported": 11.18,
   "split_factor": 1.0,
   "split_basis": "filed 2026-02-06"
  },
  {
   "fy": 2025,
   "period_end": "2025-12-31",
   "sec_frame": "CY2025",
   "value": 8.79,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/",
   "accession": "0000875045-26-000013",
   "value_reported": 8.79,
   "split_factor": 1.0,
   "split_basis": "filed 2026-02-06"
  }
 ],
 "revenue_by_fy": [
  {
   "fy": 2013,
   "period_end": "2013-12-31",
   "sec_frame": "CY2013",
   "value": 6932200000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504516000042/",
   "accession": "0000875045-16-000042"
  },
  {
   "fy": 2014,
   "period_end": "2014-12-31",
   "sec_frame": "CY2014",
   "value": 9703300000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504517000009/",
   "accession": "0000875045-17-000009"
  },
  {
   "fy": 2015,
   "period_end": "2015-12-31",
   "sec_frame": "CY2015",
   "value": 10763800000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504518000005/",
   "accession": "0000875045-18-000005"
  },
  {
   "fy": 2016,
   "period_end": "2016-12-31",
   "sec_frame": "CY2016",
   "value": 11448800000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504519000006/",
   "accession": "0000875045-19-000006"
  },
  {
   "fy": 2017,
   "period_end": "2017-12-31",
   "sec_frame": "CY2017",
   "value": 12273900000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504520000005/",
   "accession": "0000875045-20-000005"
  },
  {
   "fy": 2018,
   "period_end": "2018-12-31",
   "sec_frame": "CY2018",
   "value": 13452900000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504521000010/",
   "accession": "0000875045-21-000010"
  },
  {
   "fy": 2019,
   "period_end": "2019-12-31",
   "sec_frame": "CY2019",
   "value": 14377900000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504522000007/",
   "accession": "0000875045-22-000007"
  },
  {
   "fy": 2020,
   "period_end": "2020-12-31",
   "sec_frame": "CY2020",
   "value": 13444600000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504523000009/",
   "accession": "0000875045-23-000009"
  },
  {
   "fy": 2021,
   "period_end": "2021-12-31",
   "sec_frame": "CY2021",
   "value": 10981700000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504524000009/",
   "accession": "0000875045-24-000009"
  },
  {
   "fy": 2022,
   "period_end": "2022-12-31",
   "sec_frame": "CY2022",
   "value": 10173400000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504525000009/",
   "accession": "0000875045-25-000009"
  },
  {
   "fy": 2023,
   "period_end": "2023-12-31",
   "sec_frame": "CY2023",
   "value": 9835600000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/",
   "accession": "0000875045-26-000013"
  },
  {
   "fy": 2024,
   "period_end": "2024-12-31",
   "sec_frame": "CY2024",
   "value": 9675900000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/",
   "accession": "0000875045-26-000013"
  },
  {
   "fy": 2025,
   "period_end": "2025-12-31",
   "sec_frame": "CY2025",
   "value": 9890600000.0,
   "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/",
   "accession": "0000875045-26-000013"
  }
 ],
 "dividend_years": [],
 "insider_transactions_recent": [
  {
   "txn_date": "2026-08-04",
   "insider_name": "Minor Lloyd",
   "role": "director",
   "code": "S",
   "shares": 593.0,
   "price": 200.96,
   "value": 119169.28,
   "is_10b5_1": 1,
   "source_url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000076/"
  },
  {
   "txn_date": "2026-08-03",
   "insider_name": "Minor Lloyd",
   "role": "director",
   "code": "S",
   "shares": 593.0,
   "price": 203.34,
   "value": 120580.62,
   "is_10b5_1": 1,
   "source_url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000076/"
  }
 ],
 "links": {
  "sec_filings": "https://www.sec.gov/edgar/browse/?CIK=0000875045",
  "sec_xbrl_companyfacts": "https://data.sec.gov/api/xbrl/companyfacts/CIK0000875045.json",
  "sec_form4": "https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0000875045&type=4",
  "sec_8k": "https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0000875045&type=8-K",
  "yahoo": "https://finance.yahoo.com/quote/BIIB",
  "stooq": "https://stooq.com/q/d/?s=biib.us",
  "external_views_link_only": {
   "morningstar": "https://www.morningstar.com/search?query=BIIB",
   "finviz": "https://finviz.com/quote.ashx?t=BIIB",
   "stockanalysis": "https://stockanalysis.com/stocks/biib/",
   "seeking_alpha": "https://seekingalpha.com/symbol/BIIB",
   "openinsider": "http://openinsider.com/search?q=BIIB",
   "google_news": "https://news.google.com/rss/search?q=BIIB+stock"
  }
 },
 "machine_readable": {
  "json": "https://theclaudetrader.com/s/BIIB.json",
  "markdown": "https://theclaudetrader.com/s/BIIB.md",
  "research_packet": "https://theclaudetrader.com/r/BIIB.json",
  "index": "https://theclaudetrader.com/llms.txt"
 },
 "dossier": null,
 "cite_as": "The Claude Trader snapshot 2026-10-26, https://theclaudetrader.com/s/BIIB; data from SEC EDGAR XBRL and market prices (Alpaca Market Data, Yahoo Finance) to 2026-10-23.",
 "disclaimer": "Scores are deterministic rule outputs from public filings. fair_value_model is a labelled model estimate from the same filings (method at /fair-value), not an opinion or recommendation.",
 "fair_value_model": {
  "fair_value": 158.84,
  "fv_low": 139.9,
  "fv_high": 226.34,
  "fv_gap_pct": -36.6,
  "fv_verdict": "red",
  "fv_methods": 3,
  "fv_as_of": "2026-10-23",
  "fv_calculated_on": "2026-10-26",
  "fv_inputs_through": "2026-07-29",
  "fv_skipped": null,
  "unit": "per traded unit (share or ADS), same currency as the price",
  "methods": {
   "dcf": {
    "value": 139.89781741320172,
    "growth_used": -0.05,
    "fcf_avg": 2014266666.6666667,
    "inputs": {
     "fcf": {
      "value": 2014266666.6666667,
      "years": [
       2023,
       2024,
       2025
      ],
      "by_year": [
       1270200000.0,
       2721800000.0,
       2050800000.0
      ],
      "cfo": [
       {
        "value": 1547200000.0,
        "tag": "SEC XBRL NetCashProvidedByUsedInOperatingActivities",
        "period_end": "2023-12-31",
        "accession": "0000875045-26-000013",
        "filed": null,
        "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/"
       },
       {
        "value": 2875500000.0,
        "tag": "SEC XBRL NetCashProvidedByUsedInOperatingActivities",
        "period_end": "2024-12-31",
        "accession": "0000875045-26-000013",
        "filed": null,
        "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/"
       },
       {
        "value": 2204600000.0,
        "tag": "SEC XBRL NetCashProvidedByUsedInOperatingActivities",
        "period_end": "2025-12-31",
        "accession": "0000875045-26-000013",
        "filed": null,
        "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/"
       }
      ],
      "capex": [
       {
        "value": 277000000.0,
        "tag": "SEC XBRL PaymentsToAcquirePropertyPlantAndEquipment",
        "period_end": "2023-12-31",
        "accession": "0000875045-26-000013",
        "filed": null,
        "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/"
       },
       {
        "value": 153700000.0,
        "tag": "SEC XBRL PaymentsToAcquirePropertyPlantAndEquipment",
        "period_end": "2024-12-31",
        "accession": "0000875045-26-000013",
        "filed": null,
        "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/"
       },
       {
        "value": 153800000.0,
        "tag": "SEC XBRL PaymentsToAcquirePropertyPlantAndEquipment",
        "period_end": "2025-12-31",
        "accession": "0000875045-26-000013",
        "filed": null,
        "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/"
       }
      ]
     },
     "revenue_cagr_5y": {
      "value": -0.059551646346515,
      "from": {
       "value": 13444600000.0,
       "tag": "SEC XBRL Revenues",
       "period_end": "2020-12-31",
       "accession": "0000875045-23-000009",
       "filed": null,
       "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504523000009/"
      },
      "to": {
       "value": 9890600000.0,
       "tag": "SEC XBRL Revenues",
       "period_end": "2025-12-31",
       "accession": "0000875045-26-000013",
       "filed": null,
       "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/"
      }
     },
     "shares": {
      "value": 147753998.0,
      "tag": "SEC cover page 10-Q 0000875045-26-000075 (147,753,998 shares (single class on cover)); filing document https://www.sec.gov/Archives/edgar/data/875045/000087504526000075/biib-20260630.htm",
      "period_end": "2026-07-27",
      "accession": "0000875045-26-000075",
      "filed": "2026-07-29",
      "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000075/R1.htm"
     }
    }
   },
   "earnings": {
    "value": 226.34249999999997,
    "pe_used": 25.75,
    "pe_raw": 25.75,
    "pe_basis": "SIC 28 peer median excluding itself (25 peers)",
    "inputs": {
     "eps": {
      "fy": 2025,
      "value": 8.79,
      "tag": "SEC XBRL EarningsPerShareDiluted",
      "period_end": "2025-12-31",
      "accession": "0000875045-26-000013",
      "filed": null,
      "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/",
      "value_reported": 8.79,
      "split_factor": 1.0
     }
    }
   },
   "graham": {
    "value": 158.8359162515484,
    "inputs": {
     "eps": {
      "fy": 2025,
      "value": 8.79,
      "tag": "SEC XBRL EarningsPerShareDiluted",
      "period_end": "2025-12-31",
      "accession": "0000875045-26-000013",
      "filed": null,
      "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/",
      "value_reported": 8.79,
      "split_factor": 1.0
     },
     "bvps": {
      "value": 127.56338410551842,
      "equity": {
       "value": 18848000000.0,
       "tag": "SEC XBRL StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
       "period_end": "2026-06-30",
       "accession": "0000875045-26-000075",
       "filed": null,
       "url": "https://www.sec.gov/Archives/edgar/data/875045/000087504526000075/"
      },
      "shares": 147753998.0
     }
    }
   }
  },
  "method_note": "Median of up to three methods from SEC filings: owner-earnings DCF (3-yr avg FCF, 10-yr two-stage, growth = min(5-yr revenue CAGR, 10%) fading to 2.5%, 9% discount), trailing EPS x SIC-peer median P/E (8-35), Graham number. Model estimate, not advice.",
  "discount_rate": 0.09,
  "terminal_growth": 0.025,
  "verdict_rule": "green: fair value more than 10% above price; red: more than 10% below; amber: within 10%",
  "page": "https://theclaudetrader.com/fair-value"
 }
}