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Commitments and Contingencies Commitments and Contingencies (Details 1) (Fumapharm AG, USD $) | Dec. 31, 2013
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Five hundred million [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Cumulative sales level | $ 500,000,000
One billion |
Business Acquisition, Contingent Consideration [Line Items] |
Cumulative sales level | 1,000,000,000
Two billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Cumulative sales level | 2,000,000,000
Three billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Cumulative sales level | 3,000,000,000
Each additional one billion up to twenty billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Cumulative sales level | 20,000,000,000
Each additional sales level | 1,000,000,000
Less than five hundred million [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Sales level | 500,000,000
Less than five hundred million [Member] | Five hundred million [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 0
Less than five hundred million [Member] | One billion |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 0
Less than five hundred million [Member] | Two billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 0
Less than five hundred million [Member] | Three billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 0
Less than five hundred million [Member] | Each additional one billion up to twenty billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 0
Five hundred million to one billion [Member] | Five hundred million [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 22,000,000
Five hundred million to one billion [Member] | One billion |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 25,000,000
Five hundred million to one billion [Member] | Two billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 50,000,000
Five hundred million to one billion [Member] | Three billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 50,000,000
Five hundred million to one billion [Member] | Each additional one billion up to twenty billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 50,000,000
One billion to one point five billion [Member] | Five hundred million [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 0
One billion to one point five billion [Member] | One billion |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 50,000,000
One billion to one point five billion [Member] | Two billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 100,000,000
One billion to one point five billion [Member] | Three billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 100,000,000
One billion to one point five billion [Member] | Each additional one billion up to twenty billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 100,000,000
One point five billion to two billion [Member] | Five hundred million [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 0
One point five billion to two billion [Member] | One billion |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 0
One point five billion to two billion [Member] | Two billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 150,000,000
One point five billion to two billion [Member] | Three billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 150,000,000
One point five billion to two billion [Member] | Each additional one billion up to twenty billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 150,000,000
Two billion to two point five billion [Member] | Five hundred million [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 0
Two billion to two point five billion [Member] | One billion |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 0
Two billion to two point five billion [Member] | Two billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 200,000,000
Two billion to two point five billion [Member] | Three billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 200,000,000
Two billion to two point five billion [Member] | Each additional one billion up to twenty billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 200,000,000
Two point five billion to three billion [Member] | Five hundred million [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 0
Two point five billion to three billion [Member] | One billion |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 0
Two point five billion to three billion [Member] | Two billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 0
Two point five billion to three billion [Member] | Three billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 250,000,000
Two point five billion to three billion [Member] | Each additional one billion up to twenty billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 250,000,000
Greater than three billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Sales level | 3,000,000,000
Greater than three billion [Member] | Five hundred million [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 0
Greater than three billion [Member] | One billion |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 0
Greater than three billion [Member] | Two billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 0
Greater than three billion [Member] | Three billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 0
Greater than three billion [Member] | Each additional one billion up to twenty billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Milestone payment due on the prior 12 month sales | 300,000,000
Minimum [Member] | Five hundred million to one billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Sales level | 500,000,000
Minimum [Member] | One billion to one point five billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Sales level | 1,000,000,000
Minimum [Member] | One point five billion to two billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Sales level | 1,500,000,000
Minimum [Member] | Two billion to two point five billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Sales level | 2,000,000,000
Minimum [Member] | Two point five billion to three billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Sales level | 2,500,000,000
Maximum | Five hundred million to one billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Sales level | 1,000,000,000
Maximum | One billion to one point five billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Sales level | 1,500,000,000
Maximum | One point five billion to two billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Sales level | 2,000,000,000
Maximum | Two billion to two point five billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Sales level | 2,500,000,000
Maximum | Two point five billion to three billion [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Sales level | $ 3,000,000,000

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X
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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Namespace Prefix: | biib_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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