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BIOGEN INC.

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 2.2.0.7 false Segment Information 0219 - Disclosure - Segment Information 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_SegmentInformationAbstract biib false na duration Segment Information. 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 Segment Information. false 3 1 us-gaap_SegmentReportingDisclosureTextBlock us-gaap true na duration No definition available. 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 19 - us-gaap:SegmentReportingDisclosureTextBlock--> <div style="margin-left: 0%"> <table width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent; text-align: left"><!-- TABLE 05 --> <tr> <td width="5%"></td> <td width="95%"></td> </tr> <tr valign="top"> <td> <b><font style="font-family: 'Times New Roman', Times">19.&#160;&#160;</font></b> </td> <td> <b><font style="font-family: 'Times New Roman', Times">Segment Information</font></b> </td> </tr> </table> <div style="margin-top: 6pt; font-size: 1pt">&#160; </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> We operate in one business segment, which is the business of development, manufacturing and commercialization of innovative therapies for human health care and therefore, our chief operating decision-maker manages the operation of our Company as a single operating segment. </div> </div> <!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" --> <!-- Begin Block Tagged Note false false false us-types:textBlockItemType textblock This element may be used to capture the complete disclosure of reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10% or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 false 1 2 false UnKnown UnKnown UnKnown false true