2.2.0.7 false Income Taxes (Tables) 0514 - Disclosure - Income Taxes (Tables) true false 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 $ 2 0 biib_IncomeTaxesTablesAbstract biib false na duration Income Taxes. false false false false false true false false false false false false 1 false false false false 0 0 false false false xbrli:stringItemType string Income Taxes. false 3 1 biib_ReconciliationBetweenFederalStatutoryTaxRateAndEffectiveTaxRateTextBlock biib false na duration Reconciliation between the federal statutory tax rate and effective tax rate. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 <!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" --> <!-- Begin Block Tagged Note Table: biib-20100930_note14_table1 - biib:ReconciliationBetweenFederalStatutoryTaxRateAndEffectiveTaxRateTextBlock--> <div align="left" style="font-size: 10pt; 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</td> <td> &#160; </td> <td colspan="6" nowrap="nowrap" align="center" valign="bottom"> <b>For the Three Months<br /> </b> </td> <td> &#160; </td> <td> &#160; </td> <td colspan="6" nowrap="nowrap" align="center" valign="bottom"> <b>For the Nine Months<br /> </b> </td> <td> &#160; </td> </tr> <tr style="font-size: 8pt" valign="bottom" align="center"> <td nowrap="nowrap" align="center" valign="bottom"> &#160; </td> <td> &#160; </td> <td colspan="6" nowrap="nowrap" align="center" valign="bottom" style="border-bottom: 1px solid #000000"> <b>Ended September&#160;30,</b> </td> <td> &#160; </td> <td> &#160; </td> <td colspan="6" nowrap="nowrap" align="center" valign="bottom" style="border-bottom: 1px solid #000000"> <b>Ended September&#160;30,</b> </td> <td> &#160; </td> </tr> <tr style="font-size: 8pt" valign="bottom" align="center"> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td> &#160; </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom" style="border-bottom: 1px solid #000000"> <b>2010</b> </td> <td> &#160; 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