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| 139 |
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us-gaap: Inventory [Abstract]
|
xbrli:stringItemType |
duration |
|
us-gaap:InventoryNetAbstract |
| 140 |
|
us-gaap: Inventory
|
us-types:textBlockItemType |
duration |
|
us-gaap:InventoryDisclosureTextBlock |
| * |
|
Network: (0603 - Disclosure - Revenue Recognition) |
| 141 |
|
biib: Revenue Recognition [Abstract]
|
xbrli:stringItemType |
duration |
|
biib:RevenueRecognitionAbstract |
| 142 |
|
biib: Revenue Recognition
|
us-types:textBlockItemType |
duration |
|
biib:RevenueRecognitionTextBlock |
| * |
|
Network: (0604 - Disclosure - Intangible Assets and Goodwill) |
| 143 |
|
biib: Intangible Assets and Goodwill [Abstract]
|
xbrli:stringItemType |
duration |
|
biib:IntangibleAssetsAndGoodwillAbstract |
| 144 |
|
us-gaap: Intangible Assets and Goodwill
|
us-types:textBlockItemType |
duration |
|
us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock |
| * |
|
Network: (0605 - Disclosure - Fair Value Measurements) |
| 145 |
|
biib: Fair Value Measurements [Abstract]
|
xbrli:stringItemType |
duration |
|
biib:FairValueMeasurementsAbstract |
| 146 |
|
us-gaap: Fair Value Measurements
|
us-types:textBlockItemType |
duration |
|
us-gaap:FairValueDisclosuresTextBlock |
| * |
|
Network: (0606 - Disclosure - Financial Instruments) |
| 147 |
|
biib: Financial Instruments [Abstract]
|
xbrli:stringItemType |
duration |
|
biib:FinancialInstrumentsAbstract |
| 148 |
|
biib: Financial Instruments
|
us-types:textBlockItemType |
duration |
|
biib:FinancialInstrumentsTextBlock |
| * |
|
Network: (0607 - Disclosure - Derivative Instruments) |
| 149 |
|
us-gaap: Derivative Instruments [Abstract]
|
xbrli:stringItemType |
duration |
|
us-gaap:DerivativeInstrumentsAndHedgesAbstract |
| 150 |
|
biib: Derivative Instruments
|
us-types:textBlockItemType |
duration |
|
biib:DerivativeInstrumentsTextBlock |
| * |
|
Network: (0608 - Disclosure - Property Plant and Equipment) |
| 151 |
|
us-gaap: Property, Plant and Equipment [Abstract]
|
xbrli:stringItemType |
duration |
|
us-gaap:PropertyPlantAndEquipmentNetAbstract |
| 152 |
|
biib: Property, Plant and Equipment
|
us-types:textBlockItemType |
duration |
|
biib:PropertyPlantAndEquipmentsTextBlock |
| * |
|
Network: (0609 - Disclosure - Equity) |
| 153 |
|
us-gaap: Equity [Abstract]
|
xbrli:stringItemType |
duration |
|
us-gaap:StockholdersEquityNoteAbstract |
| 154 |
|
biib: Equity
|
us-types:textBlockItemType |
duration |
|
biib:EquityNoteDisclosureTextBlock |
| * |
|
Network: (0610 - Disclosure - Earnings per Share) |
| 155 |
|
us-gaap: Earnings per Share [Abstract]
|
xbrli:stringItemType |
duration |
|
us-gaap:EarningsPerShareAbstract |
| 156 |
|
us-gaap: Earnings per Share
|
us-types:textBlockItemType |
duration |
|
us-gaap:EarningsPerShareTextBlock |
| * |
|
Network: (0611 - Disclosure - Share Based Payments) |
| 157 |
|
us-gaap: Share-Based Payments [Abstract]
|
xbrli:stringItemType |
duration |
|
us-gaap:ShareBasedCompensationAbstract |
| 158 |
|
us-gaap: Share-Based Payments
|
us-types:textBlockItemType |
duration |
|
us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock |
| * |
|
Network: (0612 - Disclosure - Income Taxes) |
| 159 |
|
us-gaap: Income Taxes [Abstract]
|
xbrli:stringItemType |
duration |
|
us-gaap:IncomeTaxExpenseBenefitAbstract |
| 160 |
|
us-gaap: Income Taxes
|
us-types:textBlockItemType |
duration |
|
us-gaap:IncomeTaxDisclosureTextBlock |
| * |
|
Network: (0613 - Disclosure - Other Income (Expense), Net) |
| 161 |
|
us-gaap: Other Income (Expense), Net [Abstract]
|
xbrli:stringItemType |
duration |
|
us-gaap:NonoperatingIncomeExpenseAbstract |
| 162 |
|
us-gaap: Other Income (Expense), Net
|
us-types:textBlockItemType |
duration |
|
us-gaap:OtherIncomeAndOtherExpenseDisclosureTextBlock |
| * |
|
Network: (0614 - Disclosure - Collaborations) |
| 163 |
|
biib: Collaborations [Abstract]
|
xbrli:stringItemType |
duration |
|
biib:CollaborationsAbstract |
| 164 |
|
us-gaap: Collaborations
|
us-types:textBlockItemType |
duration |
|
us-gaap:CollaborativeArrangementDisclosureTextBlock |
| * |
|
Network: (0615 - Disclosure - Litigation) |
| 165 |
|
biib: Litigation [Abstract]
|
xbrli:stringItemType |
duration |
|
biib:LitigationAbstract |
| 166 |
|
biib: Litigation
|
us-types:textBlockItemType |
duration |
|
biib:LitigationTextBlock |
| * |
|
Network: (0616 - Disclosure - Segment Information) |
| 167 |
|
biib: Segment Information [Abstract]
|
xbrli:stringItemType |
duration |
|
biib:SegmentInformationAbstract |
| 168 |
|
us-gaap: Segment Information
|
us-types:textBlockItemType |
duration |
|
us-gaap:SegmentReportingDisclosureTextBlock |
| * |
|
Network: (0617 - Disclosure - New Accounting Pronouncements) |
| 169 |
|
us-gaap: New Accounting Pronouncements [Abstract]
|
xbrli:stringItemType |
duration |
|
us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract |
| 170 |
|
us-gaap: New Accounting Pronouncements
|
us-types:textBlockItemType |
duration |
|
us-gaap:ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock |