2.2.0.7 false Revenue Recognition (Tables) 0503 - Disclosure - Revenue Recognition (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_RevenueRecognitionTablesAbstract biib false na duration Revenue Recognition. 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 Revenue Recognition. false 3 1 biib_AnalysisOfAmountOfAndChangeInProductRevenueReservesTextBlock biib false na duration Analysis of the amount of, and change in, product revenue reserves. 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_note3_table1 - biib:AnalysisOfAmountOfAndChangeInProductRevenueReservesTextBlock--> <div align="left" style="font-size: 10pt; 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</td> <td> &#160; </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom"> &#160; </td> <td> &#160; </td> <td> &#160; </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom"> <b>Contractual<br /> </b> </td> <td> &#160; </td> <td> &#160; </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom"> &#160; </td> <td> &#160; </td> <td> &#160; </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom"> &#160; </td> <td> &#160; </td> </tr> <tr style="font-size: 8pt" valign="bottom" align="center"> <td nowrap="nowrap" align="left" valign="bottom" style="border-bottom: 1px solid #000000"> <b>(In millions)</b> </td> <td> &#160; </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom" style="border-bottom: 1px solid #000000"> <b>Discounts</b> </td> <td> &#160; </td> <td> &#160; </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom" style="border-bottom: 1px solid #000000"> <b>Adjustments</b> </td> <td> &#160; </td> <td> &#160; </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom" style="border-bottom: 1px solid #000000"> <b>Returns</b> </td> <td> &#160; </td> <td> &#160; </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom" style="border-bottom: 1px solid #000000"> <b>Total</b> </td> <td> &#160; </td> </tr> <tr style="line-height: 3pt; font-size: 1pt"> <td>&#160; </td> </tr> <!-- TableOutputBody --> <tr valign="bottom" style="background: #cceeff"> <td align="left" valign="bottom"> <div style="text-indent: -10pt; margin-left: 10pt"> Balance, as of December&#160;31, 2009 </div> </td> <td> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> $ </td> <td nowrap="nowrap" align="right" valign="bottom"> 13.9 </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> $ </td> <td nowrap="nowrap" align="right" valign="bottom"> 70.3 </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td> &#160; 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