v2.4.0.6
Business (Details)
9 Months Ended
Sep. 30, 2012
Business (Textual) [Abstract]
Interest in subsidiary (less than given percentage)
100.00%
X
- Details
Name:
biib_BusinessTextualAbstract
Namespace Prefix:
biib_
Data Type:
xbrli:stringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Interest in subsidiary.
+ References
No definition available.
+ Details
Name:
biib_InterestInSubsidiary
Namespace Prefix:
biib_
Data Type:
num:percentItemType
Balance Type:
na
Period Type:
duration