Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000875045-20-000005-index-headers.html | 2020-02-06 16:32:39 | |
| 0000875045-20-000005-index.html | 2020-02-06 16:32:39 | |
| 0000875045-20-000005.txt | 2020-02-06 16:32:39 | |
 0000875045-20-000005-xbrl.zip | 2948451 | 2020-02-06 16:32:39 |
 acquirediprd.jpg | 19652 | 2020-02-06 16:32:39 |
 amortofacquireintang.jpg | 20166 | 2020-02-06 16:32:39 |
 anticd20revenue.jpg | 46358 | 2020-02-06 16:32:39 |
 avonex.jpg | 5670 | 2020-02-06 16:32:39 |
 benepalia04.jpg | 629417 | 2020-02-06 16:32:39 |
| biib-20191231.xsd | 129843 | 2020-02-06 16:32:39 |
| biib-20191231x10k.htm | 5818481 | 2020-02-06 16:32:39 |
| biib-20191231x10k_htm.xml | 5597943 | 2020-02-06 16:32:39 |
| biib-20191231xex21.htm | 63176 | 2020-02-06 16:32:39 |
| biib-20191231xex23.htm | 2582 | 2020-02-06 16:32:39 |
| biib-20191231xex311.htm | 13966 | 2020-02-06 16:32:39 |
| biib-20191231xex312.htm | 14309 | 2020-02-06 16:32:39 |
| biib-20191231xex321.htm | 6585 | 2020-02-06 16:32:39 |
| biib-20191231xex44.htm | 129044 | 2020-02-06 16:32:39 |
| biib-20191231_cal.xml | 165403 | 2020-02-06 16:32:39 |
| biib-20191231_def.xml | 852984 | 2020-02-06 16:32:39 |
| biib-20191231_lab.xml | 1694809 | 2020-02-06 16:32:39 |
| biib-20191231_pre.xml | 1196746 | 2020-02-06 16:32:39 |
 biogenlogo2020a01.jpg | 12981 | 2020-02-06 16:32:39 |
 biosimilarsrev.jpg | 33068 | 2020-02-06 16:32:39 |
 bubbles20192.jpg | 59223 | 2020-02-06 16:32:39 |
 cogs.jpg | 32717 | 2020-02-06 16:32:39 |
 collaborationprofitshare.jpg | 20088 | 2020-02-06 16:32:39 |
 equityinlossofinvestee.jpg | 17223 | 2020-02-06 16:32:39 |
 fampyra.jpg | 2031 | 2020-02-06 16:32:39 |
| FilingSummary.xml | 79534 | 2020-02-06 16:32:39 |
| Financial_Report.xlsx | 224320 | 2020-02-06 16:32:39 |
 finhighlights.jpg | 35555 | 2020-02-06 16:32:39 |
 flixabi.jpg | 628388 | 2020-02-06 16:32:39 |
 fumaderm.jpg | 3140 | 2020-02-06 16:32:39 |
 fvremeasurementcc.jpg | 19677 | 2020-02-06 16:32:39 |
 gazyva.jpg | 21759 | 2020-02-06 16:32:39 |
 imraldi.jpg | 629442 | 2020-02-06 16:32:39 |
 incometaxprovision.jpg | 35034 | 2020-02-06 16:32:39 |
 interferonrev.jpg | 35937 | 2020-02-06 16:32:39 |
 lossondivestitureofdenmark.jpg | 18380 | 2020-02-06 16:32:39 |
 marketedproductsrev.jpg | 86887 | 2020-02-06 16:32:39 |
| MetaLinks.json | 1301895 | 2020-02-06 16:32:39 |
 nci.jpg | 17897 | 2020-02-06 16:32:39 |
 ocrevus.jpg | 30240 | 2020-02-06 16:32:39 |
 otherincomeexpense.jpg | 18245 | 2020-02-06 16:32:39 |
 otherrev.jpg | 29530 | 2020-02-06 16:32:39 |
 plegridy.jpg | 5127 | 2020-02-06 16:32:39 |
| R1.htm | 58906 | 2020-02-06 16:32:39 |
| R10.htm | 11702 | 2020-02-06 16:32:39 |
| R100.htm | 25480 | 2020-02-06 16:32:39 |
| R101.htm | 23587 | 2020-02-06 16:32:39 |
| R102.htm | 12558 | 2020-02-06 16:32:39 |
| R103.htm | 12826 | 2020-02-06 16:32:39 |
| R104.htm | 24039 | 2020-02-06 16:32:39 |
| R105.htm | 12633 | 2020-02-06 16:32:39 |
| R106.htm | 25575 | 2020-02-06 16:32:39 |
| R107.htm | 10965 | 2020-02-06 16:32:39 |
| R108.htm | 86458 | 2020-02-06 16:32:39 |
| R109.htm | 35824 | 2020-02-06 16:32:39 |
| R11.htm | 289798 | 2020-02-06 16:32:39 |
| R110.htm | 30626 | 2020-02-06 16:32:39 |
| R111.htm | 40079 | 2020-02-06 16:32:39 |
| R112.htm | 15837 | 2020-02-06 16:32:39 |
| R113.htm | 91537 | 2020-02-06 16:32:39 |
| R114.htm | 52638 | 2020-02-06 16:32:39 |
| R115.htm | 29018 | 2020-02-06 16:32:39 |
| R116.htm | 38449 | 2020-02-06 16:32:39 |
| R117.htm | 17531 | 2020-02-06 16:32:39 |
| R118.htm | 15823 | 2020-02-06 16:32:39 |
| R119.htm | 457308 | 2020-02-06 16:32:39 |
| R12.htm | 25518 | 2020-02-06 16:32:39 |
| R120.htm | 23742 | 2020-02-06 16:32:39 |
| R121.htm | 9143 | 2020-02-06 16:32:39 |
| R122.htm | 65980 | 2020-02-06 16:32:39 |
| R123.htm | 11627 | 2020-02-06 16:32:39 |
| R124.htm | 19685 | 2020-02-06 16:32:39 |
| R125.htm | 59288 | 2020-02-06 16:32:39 |
| R126.htm | 12898 | 2020-02-06 16:32:39 |
| R127.htm | 44161 | 2020-02-06 16:32:39 |
| R128.htm | 131516 | 2020-02-06 16:32:39 |
| R129.htm | 15386 | 2020-02-06 16:32:39 |
| R13.htm | 76064 | 2020-02-06 16:32:39 |
| R14.htm | 136306 | 2020-02-06 16:32:39 |
| R15.htm | 129495 | 2020-02-06 16:32:39 |
| R16.htm | 106973 | 2020-02-06 16:32:39 |
| R17.htm | 29270 | 2020-02-06 16:32:39 |
| R18.htm | 71129 | 2020-02-06 16:32:39 |
| R19.htm | 40248 | 2020-02-06 16:32:39 |
| R2.htm | 73832 | 2020-02-06 16:32:39 |
| R20.htm | 165752 | 2020-02-06 16:32:39 |
| R21.htm | 31342 | 2020-02-06 16:32:39 |
| R22.htm | 174720 | 2020-02-06 16:32:39 |
| R23.htm | 151424 | 2020-02-06 16:32:39 |
| R24.htm | 67636 | 2020-02-06 16:32:39 |
| R25.htm | 157384 | 2020-02-06 16:32:39 |
| R26.htm | 14443 | 2020-02-06 16:32:39 |
| R27.htm | 26558 | 2020-02-06 16:32:39 |
| R28.htm | 23014 | 2020-02-06 16:32:39 |
| R29.htm | 6853 | 2020-02-06 16:32:39 |
| R3.htm | 51551 | 2020-02-06 16:32:39 |
| R30.htm | 17407 | 2020-02-06 16:32:39 |
| R31.htm | 78548 | 2020-02-06 16:32:39 |
| R32.htm | 146565 | 2020-02-06 16:32:39 |
| R33.htm | 7831 | 2020-02-06 16:32:39 |
| R34.htm | 190456 | 2020-02-06 16:32:39 |
| R35.htm | 8883 | 2020-02-06 16:32:39 |
| R36.htm | 11852 | 2020-02-06 16:32:39 |
| R37.htm | 298386 | 2020-02-06 16:32:39 |
| R38.htm | 22058 | 2020-02-06 16:32:39 |
| R39.htm | 54260 | 2020-02-06 16:32:39 |
| R4.htm | 93344 | 2020-02-06 16:32:39 |
| R40.htm | 122604 | 2020-02-06 16:32:39 |
| R41.htm | 122787 | 2020-02-06 16:32:39 |
| R42.htm | 95199 | 2020-02-06 16:32:39 |
| R43.htm | 22823 | 2020-02-06 16:32:39 |
| R44.htm | 77649 | 2020-02-06 16:32:39 |
| R45.htm | 29911 | 2020-02-06 16:32:39 |
| R46.htm | 18428 | 2020-02-06 16:32:39 |
| R47.htm | 143231 | 2020-02-06 16:32:39 |
| R48.htm | 29877 | 2020-02-06 16:32:39 |
| R49.htm | 161434 | 2020-02-06 16:32:39 |
| R5.htm | 8647 | 2020-02-06 16:32:39 |
| R50.htm | 130848 | 2020-02-06 16:32:39 |
| R51.htm | 66263 | 2020-02-06 16:32:39 |
| R52.htm | 75435 | 2020-02-06 16:32:39 |
| R53.htm | 28693 | 2020-02-06 16:32:39 |
| R54.htm | 72130 | 2020-02-06 16:32:39 |
| R55.htm | 146568 | 2020-02-06 16:32:39 |
| R56.htm | 51886 | 2020-02-06 16:32:39 |
| R57.htm | 21838 | 2020-02-06 16:32:39 |
| R58.htm | 61479 | 2020-02-06 16:32:39 |
| R59.htm | 26034 | 2020-02-06 16:32:39 |
| R6.htm | 95592 | 2020-02-06 16:32:39 |
| R60.htm | 134405 | 2020-02-06 16:32:39 |
| R61.htm | 25572 | 2020-02-06 16:32:39 |
| R62.htm | 6857 | 2020-02-06 16:32:39 |
| R63.htm | 17057 | 2020-02-06 16:32:39 |
| R64.htm | 26673 | 2020-02-06 16:32:39 |
| R65.htm | 31516 | 2020-02-06 16:32:39 |
| R66.htm | 15523 | 2020-02-06 16:32:39 |
| R67.htm | 14903 | 2020-02-06 16:32:39 |
| R68.htm | 99535 | 2020-02-06 16:32:39 |
| R69.htm | 26538 | 2020-02-06 16:32:39 |
| R7.htm | 146821 | 2020-02-06 16:32:39 |
| R70.htm | 55418 | 2020-02-06 16:32:39 |
| R71.htm | 12846 | 2020-02-06 16:32:39 |
| R72.htm | 15200 | 2020-02-06 16:32:39 |
| R73.htm | 80412 | 2020-02-06 16:32:39 |
| R74.htm | 12938 | 2020-02-06 16:32:39 |
| R75.htm | 40221 | 2020-02-06 16:32:39 |
| R76.htm | 21955 | 2020-02-06 16:32:39 |
| R77.htm | 9053 | 2020-02-06 16:32:39 |
| R78.htm | 6392 | 2020-02-06 16:32:39 |
| R79.htm | 26460 | 2020-02-06 16:32:39 |
| R8.htm | 125637 | 2020-02-06 16:32:39 |
| R80.htm | 19271 | 2020-02-06 16:32:39 |
| R81.htm | 31135 | 2020-02-06 16:32:39 |
| R82.htm | 45188 | 2020-02-06 16:32:39 |
| R83.htm | 29525 | 2020-02-06 16:32:39 |
| R84.htm | 24885 | 2020-02-06 16:32:39 |
| R85.htm | 21393 | 2020-02-06 16:32:39 |
| R86.htm | 97091 | 2020-02-06 16:32:39 |
| R87.htm | 12596 | 2020-02-06 16:32:39 |
| R88.htm | 22584 | 2020-02-06 16:32:39 |
| R89.htm | 19090 | 2020-02-06 16:32:39 |
| R9.htm | 28295 | 2020-02-06 16:32:39 |
| R90.htm | 40463 | 2020-02-06 16:32:39 |
| R91.htm | 9046 | 2020-02-06 16:32:39 |
| R92.htm | 31981 | 2020-02-06 16:32:39 |
| R93.htm | 52352 | 2020-02-06 16:32:39 |
| R94.htm | 35169 | 2020-02-06 16:32:39 |
| R95.htm | 39606 | 2020-02-06 16:32:39 |
| R96.htm | 20612 | 2020-02-06 16:32:39 |
| R97.htm | 33013 | 2020-02-06 16:32:39 |
| R98.htm | 20681 | 2020-02-06 16:32:39 |
| R99.htm | 7173 | 2020-02-06 16:32:39 |
| R9999.htm | 4842 | 2020-02-06 16:32:39 |
| report.css | 2768 | 2020-02-06 16:32:39 |
 researchanddev.jpg | 39169 | 2020-02-06 16:32:39 |
 researchanddevelopment.jpg | 69143 | 2020-02-06 16:32:39 |
 reservesdisandallow.jpg | 32711 | 2020-02-06 16:32:39 |
 rituxan.jpg | 9985 | 2020-02-06 16:32:39 |
 rituxanhycelalogo300x87.jpg | 9120 | 2020-02-06 16:32:39 |
 sellinggeneralandadmin.jpg | 20785 | 2020-02-06 16:32:39 |
| Show.js | 1085 | 2020-02-06 16:32:39 |
 spinrazalogonewa01.jpg | 72059 | 2020-02-06 16:32:39 |
 spinrazarev.jpg | 34301 | 2020-02-06 16:32:39 |
 stockperfgraph.jpg | 66807 | 2020-02-06 16:32:39 |
 tecfidera.jpg | 7384 | 2020-02-06 16:32:39 |
 tecfiderarev.jpg | 35617 | 2020-02-06 16:32:39 |
 tysabri.jpg | 6359 | 2020-02-06 16:32:39 |
 tysabrirev.jpg | 36569 | 2020-02-06 16:32:39 |
 vumerity-logoa03.jpg | 4657 | 2020-02-06 16:32:39 |