Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000875045-21-000028-index-headers.html | 2021-04-22 16:14:39 | |
| 0000875045-21-000028-index.html | 2021-04-22 16:14:39 | |
| 0000875045-21-000028.txt | 2021-04-22 16:14:39 | |
 0000875045-21-000028-xbrl.zip | 1250927 | 2021-04-22 16:14:39 |
| biib-20210331.htm | 2483015 | 2021-04-22 16:14:39 |
| biib-20210331.xsd | 77452 | 2021-04-22 16:14:39 |
| biib-20210331_cal.xml | 108611 | 2021-04-22 16:14:39 |
| biib-20210331_def.xml | 479867 | 2021-04-22 16:14:39 |
 biib-20210331_g1.jpg | 62626 | 2021-04-22 16:14:39 |
 biib-20210331_g10.jpg | 44250 | 2021-04-22 16:14:39 |
 biib-20210331_g11.jpg | 66148 | 2021-04-22 16:14:39 |
 biib-20210331_g12.jpg | 105358 | 2021-04-22 16:14:39 |
 biib-20210331_g13.jpg | 35136 | 2021-04-22 16:14:39 |
 biib-20210331_g14.jpg | 34908 | 2021-04-22 16:14:39 |
 biib-20210331_g15.jpg | 34335 | 2021-04-22 16:14:39 |
 biib-20210331_g16.jpg | 35747 | 2021-04-22 16:14:39 |
 biib-20210331_g17.jpg | 32660 | 2021-04-22 16:14:39 |
 biib-20210331_g18.jpg | 34528 | 2021-04-22 16:14:39 |
 biib-20210331_g19.jpg | 57680 | 2021-04-22 16:14:39 |
 biib-20210331_g2.jpg | 52903 | 2021-04-22 16:14:39 |
 biib-20210331_g20.jpg | 33133 | 2021-04-22 16:14:39 |
 biib-20210331_g3.jpg | 50163 | 2021-04-22 16:14:39 |
 biib-20210331_g4.jpg | 50343 | 2021-04-22 16:14:39 |
 biib-20210331_g5.jpg | 49261 | 2021-04-22 16:14:39 |
 biib-20210331_g6.jpg | 53475 | 2021-04-22 16:14:39 |
 biib-20210331_g7.jpg | 68243 | 2021-04-22 16:14:39 |
 biib-20210331_g8.jpg | 52249 | 2021-04-22 16:14:39 |
 biib-20210331_g9.jpg | 57407 | 2021-04-22 16:14:39 |
| biib-20210331_htm.xml | 2240238 | 2021-04-22 16:14:39 |
| biib-20210331_lab.xml | 886787 | 2021-04-22 16:14:39 |
| biib-20210331_pre.xml | 618416 | 2021-04-22 16:14:39 |
| biib-2021331xex101.htm | 531825 | 2021-04-22 16:14:39 |
| biib-2021331xex311.htm | 10911 | 2021-04-22 16:14:39 |
| biib-2021331xex312.htm | 10586 | 2021-04-22 16:14:39 |
| biib-2021331xex321.htm | 8522 | 2021-04-22 16:14:39 |
| FilingSummary.xml | 47159 | 2021-04-22 16:14:39 |
| Financial_Report.xlsx | 126530 | 2021-04-22 16:14:39 |
| MetaLinks.json | 822551 | 2021-04-22 16:14:39 |
| R1.htm | 52195 | 2021-04-22 16:14:39 |
| R10.htm | 95426 | 2021-04-22 16:14:39 |
| R11.htm | 12045 | 2021-04-22 16:14:39 |
| R12.htm | 40399 | 2021-04-22 16:14:39 |
| R13.htm | 111563 | 2021-04-22 16:14:39 |
| R14.htm | 97459 | 2021-04-22 16:14:39 |
| R15.htm | 59969 | 2021-04-22 16:14:39 |
| R16.htm | 6869 | 2021-04-22 16:14:39 |
| R17.htm | 12046 | 2021-04-22 16:14:39 |
| R18.htm | 64508 | 2021-04-22 16:14:39 |
| R19.htm | 18595 | 2021-04-22 16:14:39 |
| R2.htm | 83022 | 2021-04-22 16:14:39 |
| R20.htm | 32683 | 2021-04-22 16:14:39 |
| R21.htm | 26077 | 2021-04-22 16:14:39 |
| R22.htm | 35214 | 2021-04-22 16:14:39 |
| R23.htm | 61076 | 2021-04-22 16:14:39 |
| R24.htm | 14296 | 2021-04-22 16:14:39 |
| R25.htm | 24245 | 2021-04-22 16:14:39 |
| R26.htm | 24798 | 2021-04-22 16:14:39 |
| R27.htm | 97222 | 2021-04-22 16:14:39 |
| R28.htm | 13083 | 2021-04-22 16:14:39 |
| R29.htm | 37126 | 2021-04-22 16:14:39 |
| R3.htm | 39719 | 2021-04-22 16:14:39 |
| R30.htm | 96340 | 2021-04-22 16:14:39 |
| R31.htm | 92747 | 2021-04-22 16:14:39 |
| R32.htm | 57006 | 2021-04-22 16:14:39 |
| R33.htm | 63428 | 2021-04-22 16:14:39 |
| R34.htm | 17848 | 2021-04-22 16:14:39 |
| R35.htm | 35263 | 2021-04-22 16:14:39 |
| R36.htm | 18216 | 2021-04-22 16:14:39 |
| R37.htm | 36346 | 2021-04-22 16:14:39 |
| R38.htm | 21926 | 2021-04-22 16:14:39 |
| R39.htm | 7591 | 2021-04-22 16:14:39 |
| R4.htm | 108598 | 2021-04-22 16:14:39 |
| R40.htm | 8735 | 2021-04-22 16:14:39 |
| R41.htm | 57134 | 2021-04-22 16:14:39 |
| R42.htm | 22881 | 2021-04-22 16:14:39 |
| R43.htm | 6562 | 2021-04-22 16:14:39 |
| R44.htm | 15642 | 2021-04-22 16:14:39 |
| R45.htm | 19136 | 2021-04-22 16:14:39 |
| R46.htm | 19248 | 2021-04-22 16:14:39 |
| R47.htm | 11167 | 2021-04-22 16:14:39 |
| R48.htm | 68228 | 2021-04-22 16:14:39 |
| R49.htm | 11669 | 2021-04-22 16:14:39 |
| R5.htm | 6357 | 2021-04-22 16:14:39 |
| R50.htm | 62121 | 2021-04-22 16:14:39 |
| R51.htm | 19366 | 2021-04-22 16:14:39 |
| R52.htm | 12080 | 2021-04-22 16:14:39 |
| R53.htm | 41808 | 2021-04-22 16:14:39 |
| R54.htm | 9800 | 2021-04-22 16:14:39 |
| R55.htm | 12932 | 2021-04-22 16:14:39 |
| R56.htm | 46649 | 2021-04-22 16:14:39 |
| R57.htm | 21103 | 2021-04-22 16:14:39 |
| R58.htm | 9228 | 2021-04-22 16:14:39 |
| R59.htm | 4263 | 2021-04-22 16:14:39 |
| R6.htm | 89634 | 2021-04-22 16:14:39 |
| R60.htm | 31457 | 2021-04-22 16:14:39 |
| R61.htm | 127982 | 2021-04-22 16:14:39 |
| R62.htm | 19179 | 2021-04-22 16:14:39 |
| R63.htm | 55276 | 2021-04-22 16:14:39 |
| R64.htm | 19950 | 2021-04-22 16:14:39 |
| R65.htm | 43471 | 2021-04-22 16:14:39 |
| R66.htm | 35252 | 2021-04-22 16:14:39 |
| R67.htm | 29843 | 2021-04-22 16:14:39 |
| R68.htm | 19216 | 2021-04-22 16:14:39 |
| R69.htm | 25685 | 2021-04-22 16:14:39 |
| R7.htm | 96011 | 2021-04-22 16:14:39 |
| R70.htm | 9675 | 2021-04-22 16:14:39 |
| R71.htm | 21116 | 2021-04-22 16:14:39 |
| R72.htm | 47898 | 2021-04-22 16:14:39 |
| R73.htm | 16504 | 2021-04-22 16:14:39 |
| R74.htm | 75747 | 2021-04-22 16:14:39 |
| R75.htm | 70383 | 2021-04-22 16:14:39 |
| R76.htm | 36328 | 2021-04-22 16:14:39 |
| R77.htm | 4931 | 2021-04-22 16:14:39 |
| R8.htm | 17166 | 2021-04-22 16:14:39 |
| R9.htm | 5642 | 2021-04-22 16:14:39 |
| report.css | 2768 | 2021-04-22 16:14:39 |
| Show.js | 1086 | 2021-04-22 16:14:39 |