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Segments - Schedule of Revenues by Major Products and Activities (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Product Information [Line Items]      
Revenues $ 15,878 $ 16,659 $ 16,887
North America [Member]      
Product Information [Line Items]      
Revenues 7,809 8,447 8,542
Europe [Member]      
Product Information [Line Items]      
Revenues 4,886 4,757 4,795
International Markets [Member]      
Product Information [Line Items]      
Revenues 2,032 2,154 2,246
Generic products [Member] | North America [Member]      
Product Information [Line Items]      
Revenues 3,769 4,010 3,963
Generic products [Member] | Europe [Member]      
Product Information [Line Items]      
Revenues 3,569 3,513 3,470
Generic products [Member] | International Markets [Member]      
Product Information [Line Items]      
Revenues 1,649 1,792 1,893
COPAXONE [Member] | North America [Member]      
Product Information [Line Items]      
Revenues 577 884 1,017
COPAXONE [Member] | Europe [Member]      
Product Information [Line Items]      
Revenues 391 400 432
COPAXONE [Member] | International Markets [Member]      
Product Information [Line Items]      
Revenues 37 53 63
BENDEKA and TREANDA [Member] | North America [Member]      
Product Information [Line Items]      
Revenues 385 415 496
ProAir [Member] | North America [Member]      
Product Information [Line Items]      
Revenues 180 241 274
AJOVY [Member] | North America [Member]      
Product Information [Line Items]      
Revenues 176 134 93
AJOVY [Member] | Europe [Member]      
Product Information [Line Items]      
Revenues 87 31 3
AJOVY [Member] | International Markets [Member]      
Product Information [Line Items]      
Revenues 50 18  
AUSTEDO [Member] | North America [Member]      
Product Information [Line Items]      
Revenues 802 637 412
Respiratory Product [Member] | Europe [Member]      
Product Information [Line Items]      
Revenues 356 353 354
Anda [Member] | North America [Member]      
Product Information [Line Items]      
Revenues 1,323 1,462 1,492
Other [Member] | North America [Member]      
Product Information [Line Items]      
Revenues 597 664 796
Other [Member] | Europe [Member]      
Product Information [Line Items]      
Revenues 483 459 536
Other [Member] | International Markets [Member]      
Product Information [Line Items]      
Revenues $ 295 $ 291 $ 291