beatandraise : Equity Research with AI and ChatGPT on SEC Edgar

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2.2.0.7 true Income Taxes (Details) (USD $) 0614 - Disclosure - Income Taxes (Details) true false In Millions false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ false 2 USD false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ false 3 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 4 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ false 5 USD false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ false 6 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 7 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ 2 Reconciliation between the U.S. federal statutory tax rate and effective tax rate 2 us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 3 Statutory rate 2 us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 0.35 0.35 false false false 2 false true false false 0.35 0.35 false false false 3 false false false false 0 0 false false false 4 false true false false 0.35 0.35 false false false 5 false true false false 0.35 0.35 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false us-types:percentItemType pure The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate shall be the regular tax rate if there are alternative tax systems. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 47 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 true 15 Income Taxes (Textuals) [Abstract] 2 biib_IncomeTaxesTextualsAbstract biib false na duration Income Taxes Textuals. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false xbrli:stringItemType string Income Taxes Textuals. false 16 Effective tax rate 2 us-gaap_EffectiveIncomeTaxRateContinuingOperations us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 0.401 0.401 false false false 2 false true false false 0.29 0.29 false false false 3 false false false false 0 0 false false false 4 false true false false 0.287 0.287 false false false 5 false true false false 0.288 0.288 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false us-types:percentItemType pure A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 14 -Paragraph 3 false 19 Increase in effective tax rate due to collaboration 2 biib_IncreaseInEffectiveTaxRateDueToCollaboration biib false na duration Increase in effective tax rate due to collaboration. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false true false false 0.024 0.024 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0.023 0.023 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false us-types:percentItemType pure Increase in effective tax rate due to collaboration. 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No authoritative reference available. false 22 Knopp [Member] 0 na true na na No definition available. false true false false false false false false false false false http://biogenidec.com/role/incometaxesdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false false 8 USD true false false false Knopp [Member] us-gaap_VariableInterestByInterestTypeAxis xbrldi http://xbrl.org/2006/xbrldi biib_VariableInterestEnterpriseThreeMember us-gaap_VariableInterestByInterestTypeAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 $ false 9 USD true false false false Knopp [Member] us-gaap_VariableInterestByInterestTypeAxis xbrldi http://xbrl.org/2006/xbrldi biib_VariableInterestEnterpriseThreeMember us-gaap_VariableInterestByInterestTypeAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 $ na No definition available. 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