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No authoritative reference available. false 4 Current provisions relating to sales in current year 2 biib_CurrentProvisionsToProductRevenueReservesRelatingToSalesInCurrentYear biib false credit duration Current provisions to product revenue reserves relating to sales in current year. 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 false false false 0 0 false false false 3 false true false false 275000000 275000000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Current provisions to product revenue reserves relating to sales in current year. 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No authoritative reference available. false 11 Current liability 2 biib_ProductRevenueReservesClassifiedAsReductionOfCurrentLiabilities biib false credit instant Product revenue reserves classified as a reduction of current liabilities. false false false false false false false false false false false totallabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 100600000 100600000 false false false 4 false true false false 59800000 59800000 false false false xbrli:monetaryItemType monetary Product revenue reserves classified as a reduction of current liabilities. No authoritative reference available. true 12 Total reserves 2 biib_ProductRevenueReserves biib false credit instant Product revenue reserves. false false false false false false false false false false false totallabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 135300000 135300000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Product revenue reserves. No authoritative reference available. true 13 Revenue Recognition (Textuals) [Abstract] 2 biib_RevenueRecognitionTextualsAbstract biib false na duration Revenue Recognition Textuals Abstract. 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 xbrli:stringItemType string Revenue Recognition Textuals Abstract. false 14 Deferred Revenue 2 us-gaap_DeferredRevenueAdditions us-gaap true credit duration No definition available. 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 125000000 125000000 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A false 15 New minimum Medicaid rate after implementation of new Healthcare Reform 2 biib_MinimumMedicaidRebateAfterIncreaseInPercentage biib false na duration New minimum Medicaid rate after implementation of new Healthcare Reform. false false false false false false false false false false false verboselabel false 1 false true false false 0.231 0.231 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 us-types:percentItemType pure New minimum Medicaid rate after implementation of new Healthcare Reform. No authoritative reference available. false 16 Old minimum Medicaid rate before implementation of new Healthcare Reform 2 biib_MinimumMedicaidRebatePriorToIncreaseInPercentage biib false na duration Old minimum Medicaid rate before implementation of new Healthcare Reform. false false false false false false false false false false false verboselabel false 1 false true false false 0.151 0.151 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 us-types:percentItemType pure Old minimum Medicaid rate before implementation of new Healthcare Reform. No authoritative reference available. false 17 Discount percentage to Medicare beneficiaries whose prescription drug costs become subject to Medicare Part D coverage gap 2 biib_DiscountPercentageToMedicareBeneficiariesWhosePrescriptionDrugCostsBecomeSubjectToMedicarePartDCoverageGap biib false na duration Discount percentage to Medicare beneficiaries whose prescription drug costs become subject to Medicare Part D coverage gap. false false false false false false false false false false false verboselabel false 1 false true false false 0.5 0.5 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 us-types:percentItemType pure Discount percentage to Medicare beneficiaries whose prescription drug costs become subject to Medicare Part D coverage gap. No authoritative reference available. false 18 Expected aggregate Industry fees 2 biib_ExpectedAggregateIndustryFees biib false debit duration Expected aggregate Industry fees. 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 false false false 0 0 false false false 3 false true false false 28000000000 28000000000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Expected aggregate Industry fees. No authoritative reference available. false 19 Maximum industry fees annual 2 biib_MaximumIndustryFeesAnnual biib false debit duration Maximum industry fees annual. 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 false false false 0 0 false false false 3 false true false false 2500000000 2500000000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Maximum industry fees annual. No authoritative reference available. false 20 Accounts receivable in countries with deteriorated credit and economic conditions 2 biib_AccountsReceivableInCountriesWithDeterioratedCreditAndEconomicConditions biib false debit instant Accounts receivable in countries with deteriorated credit and economic conditions false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 250400000 250400000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Accounts receivable in countries with deteriorated credit and economic conditions No authoritative reference available. false 21 Discounts [Member] 0 na true na na No definition available. false true false false false false false false false false false http://biogenidec.com/role/revenuerecognitiondetails 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 false 5 USD true false false false Discounts [Member] us-gaap_ValuationAllowancesAndReservesTypeAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_ReserveForCashDiscountMember us-gaap_ValuationAllowancesAndReservesTypeAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 22 Analysis of the amount of, and change in, product revenue reserves [Abstract] 2 us-gaap_TimeSharingTransactionsAllowanceForUncollectibleAccountsRollForward 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 xbrli:stringItemType string A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. false 23 Balance, as of December 31, 2009 2 biib_ProductRevenueReserves biib false credit instant Product revenue reserves. false false false false false false false false true false false periodstartlabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 13900000 13900000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Product revenue reserves. No authoritative reference available. false 24 Current provisions relating to sales in current year 2 biib_CurrentProvisionsToProductRevenueReservesRelatingToSalesInCurrentYear biib false credit duration Current provisions to product revenue reserves relating to sales in current year. 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 false false false 0 0 false false false 3 false true false false 58000000 58000000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Current provisions to product revenue reserves relating to sales in current year. No authoritative reference available. false 25 Adjustments relating to prior years 2 biib_AdjustmentsToProductRevenueReservesRelatingToSalesInPriorYears biib false credit duration Adjustments to product revenue reserves relating to sales in prior years. 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 false false false 0 0 false false false 3 false true false false -2400000 -2400000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Adjustments to product revenue reserves relating to sales in prior years. No authoritative reference available. false 26 Payments/returns relating to sales in current year 2 biib_AdjustmentsToProductRevenueReservesForPaymentsReturnsRelatingToSalesInCurrentYear biib false debit duration Adjustments to product revenue reserves for payments/returns relating to sales in current year. 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 false false false 0 0 false false false 3 false true false false -45900000 -45900000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Adjustments to product revenue reserves for payments/returns relating to sales in current year. No authoritative reference available. false 27 Payments/returns relating to sales in prior years 2 biib_AdjustmentsToProductRevenueReservesForPaymentsReturnsRelatingToSalesInPriorYear biib false debit duration Adjustments to product revenue reserves for payments/returns relating to sales in prior year. false false false false false false false false false false false totallabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -9500000 -9500000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Adjustments to product revenue reserves for payments/returns relating to sales in prior year. No authoritative reference available. true 28 Balance, as of September 30, 2010 2 biib_ProductRevenueReserves biib false credit instant Product revenue reserves. false false false false false false false false false true false periodendlabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 14100000 14100000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Product revenue reserves. No authoritative reference available. false 29 Summary of total product revenue reserves included in consolidated balance sheets [Abstract] 2 biib_SummaryOfTotalProductRevenueReservesIncludedInConsolidatedBalanceSheetsAbstract biib false na duration Summary of total product revenue reserves included in consolidated balance sheets. 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 xbrli:stringItemType string Summary of total product revenue reserves included in consolidated balance sheets. false 32 Total reserves 2 biib_ProductRevenueReserves biib false credit instant Product revenue reserves. false false false false false false false false false false false totallabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 14100000 14100000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Product revenue reserves. No authoritative reference available. true 41 Contractual Adjustments [Member] 0 na true na na No definition available. false true false false false false false false false false false http://biogenidec.com/role/revenuerecognitiondetails 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 false 6 USD true false false false Contractual Adjustments [Member] us-gaap_ValuationAllowancesAndReservesTypeAxis xbrldi http://xbrl.org/2006/xbrldi biib_ContractualAdjustmentsMember us-gaap_ValuationAllowancesAndReservesTypeAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 42 Analysis of the amount of, and change in, product revenue reserves [Abstract] 2 us-gaap_TimeSharingTransactionsAllowanceForUncollectibleAccountsRollForward 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 xbrli:stringItemType string A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. false 43 Balance, as of December 31, 2009 2 biib_ProductRevenueReserves biib false credit instant Product revenue reserves. false false false false false false false false true false false periodstartlabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 70300000 70300000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Product revenue reserves. No authoritative reference available. false 44 Current provisions relating to sales in current year 2 biib_CurrentProvisionsToProductRevenueReservesRelatingToSalesInCurrentYear biib false credit duration Current provisions to product revenue reserves relating to sales in current year. 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 false false false 0 0 false false false 3 false true false false 204700000 204700000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Current provisions to product revenue reserves relating to sales in current year. No authoritative reference available. false 45 Adjustments relating to prior years 2 biib_AdjustmentsToProductRevenueReservesRelatingToSalesInPriorYears biib false credit duration Adjustments to product revenue reserves relating to sales in prior years. 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 false false false 0 0 false false false 3 false true false false -2200000 -2200000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Adjustments to product revenue reserves relating to sales in prior years. No authoritative reference available. false 46 Payments/returns relating to sales in current year 2 biib_AdjustmentsToProductRevenueReservesForPaymentsReturnsRelatingToSalesInCurrentYear biib false debit duration Adjustments to product revenue reserves for payments/returns relating to sales in current year. 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 false false false 0 0 false false false 3 false true false false -110300000 -110300000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Adjustments to product revenue reserves for payments/returns relating to sales in current year. No authoritative reference available. false 47 Payments/returns relating to sales in prior years 2 biib_AdjustmentsToProductRevenueReservesForPaymentsReturnsRelatingToSalesInPriorYear biib false debit duration Adjustments to product revenue reserves for payments/returns relating to sales in prior year. false false false false false false false false false false false totallabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -60700000 -60700000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Adjustments to product revenue reserves for payments/returns relating to sales in prior year. No authoritative reference available. true 48 Balance, as of September 30, 2010 2 biib_ProductRevenueReserves biib false credit instant Product revenue reserves. false false false false false false false false false true false periodendlabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 101800000 101800000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Product revenue reserves. No authoritative reference available. false 49 Summary of total product revenue reserves included in consolidated balance sheets [Abstract] 2 biib_SummaryOfTotalProductRevenueReservesIncludedInConsolidatedBalanceSheetsAbstract biib false na duration Summary of total product revenue reserves included in consolidated balance sheets. 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 xbrli:stringItemType string Summary of total product revenue reserves included in consolidated balance sheets. false 52 Total reserves 2 biib_ProductRevenueReserves biib false credit instant Product revenue reserves. false false false false false false false false false false false totallabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 101800000 101800000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Product revenue reserves. No authoritative reference available. true 61 Returns [Member] 0 na true na na No definition available. false true false false false false false false false false false http://biogenidec.com/role/revenuerecognitiondetails 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 false 7 USD true false false false Returns [Member] us-gaap_ValuationAllowancesAndReservesTypeAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_SalesReturnsAndAllowancesMember us-gaap_ValuationAllowancesAndReservesTypeAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 62 Analysis of the amount of, and change in, product revenue reserves [Abstract] 2 us-gaap_TimeSharingTransactionsAllowanceForUncollectibleAccountsRollForward 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 xbrli:stringItemType string A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. false 63 Balance, as of December 31, 2009 2 biib_ProductRevenueReserves biib false credit instant Product revenue reserves. false false false false false false false false true false false periodstartlabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 18900000 18900000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Product revenue reserves. No authoritative reference available. false 64 Current provisions relating to sales in current year 2 biib_CurrentProvisionsToProductRevenueReservesRelatingToSalesInCurrentYear biib false credit duration Current provisions to product revenue reserves relating to sales in current year. 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 false false false 0 0 false false false 3 false true false false 12300000 12300000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Current provisions to product revenue reserves relating to sales in current year. No authoritative reference available. false 65 Adjustments relating to prior years 2 biib_AdjustmentsToProductRevenueReservesRelatingToSalesInPriorYears biib false credit duration Adjustments to product revenue reserves relating to sales in prior years. 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 false false false 0 0 false false false 3 false true false false -1800000 -1800000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Adjustments to product revenue reserves relating to sales in prior years. No authoritative reference available. false 66 Payments/returns relating to sales in current year 2 biib_AdjustmentsToProductRevenueReservesForPaymentsReturnsRelatingToSalesInCurrentYear biib false debit duration Adjustments to product revenue reserves for payments/returns relating to sales in current year. 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 false false false 0 0 false false false 3 false true false false -500000 -500000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Adjustments to product revenue reserves for payments/returns relating to sales in current year. No authoritative reference available. false 67 Payments/returns relating to sales in prior years 2 biib_AdjustmentsToProductRevenueReservesForPaymentsReturnsRelatingToSalesInPriorYear biib false debit duration Adjustments to product revenue reserves for payments/returns relating to sales in prior year. false false false false false false false false false false false totallabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -9500000 -9500000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Adjustments to product revenue reserves for payments/returns relating to sales in prior year. No authoritative reference available. true 68 Balance, as of September 30, 2010 2 biib_ProductRevenueReserves biib false credit instant Product revenue reserves. false false false false false false false false false true false periodendlabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 19400000 19400000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Product revenue reserves. No authoritative reference available. false 69 Summary of total product revenue reserves included in consolidated balance sheets [Abstract] 2 biib_SummaryOfTotalProductRevenueReservesIncludedInConsolidatedBalanceSheetsAbstract biib false na duration Summary of total product revenue reserves included in consolidated balance sheets. 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 xbrli:stringItemType string Summary of total product revenue reserves included in consolidated balance sheets. false 72 Total reserves 2 biib_ProductRevenueReserves biib false credit instant Product revenue reserves. false false false false false false false false false false false totallabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 true true false false 19400000 19400000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Product revenue reserves. No authoritative reference available. true 4 49 false NoRounding UnKnown UnKnown false true