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Segments - Schedule of Revenues by Major Products and Activities (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Product Information [Line Items]                      
Revenues $ 4,468 $ 4,093 $ 4,177 $ 4,149 $ 4,419 $ 4,385 $ 4,552 $ 4,916 $ 16,887 $ 18,271 $ 21,853
North America [Member]                      
Product Information [Line Items]                      
Revenues                 8,542 9,297 12,141
Europe [Member]                      
Product Information [Line Items]                      
Revenues                 4,795 5,186 5,466
International Markets [Member]                      
Product Information [Line Items]                      
Revenues [1]                 2,246 2,422 2,863
Generic products [Member] | North America [Member]                      
Product Information [Line Items]                      
Revenues                 3,963 4,056 5,203
Generic products [Member] | Europe [Member]                      
Product Information [Line Items]                      
Revenues                 3,470 3,593 3,471
Generic products [Member] | International Markets [Member]                      
Product Information [Line Items]                      
Revenues                 1,893 2,022 2,370
COPAXONE [Member] | North America [Member]                      
Product Information [Line Items]                      
Revenues                 1,017 1,759 3,116
COPAXONE [Member] | Europe [Member]                      
Product Information [Line Items]                      
Revenues                 432 535 595
COPAXONE [Member] | International Markets [Member]                      
Product Information [Line Items]                      
Revenues                 63 72 91
BENDEKA and TREANDA [Member] | North America [Member]                      
Product Information [Line Items]                      
Revenues                 496 642 656
ProAir [Member] | North America [Member]                      
Product Information [Line Items]                      
Revenues                 274 397 501
QVAR [Member] | North America [Member]                      
Product Information [Line Items]                      
Revenues                 250 182 313
AJOVY [Member] | North America [Member]                      
Product Information [Line Items]                      
Revenues                 93 3  
AUSTEDO [Member] | North America [Member]                      
Product Information [Line Items]                      
Revenues                 412 204 24
Distribution [Member] | International Markets [Member]                      
Product Information [Line Items]                      
Revenues                 20 19 17
Respiratory Product [Member] | Europe [Member]                      
Product Information [Line Items]                      
Revenues                 354 402 368
Anda [Member] | North America [Member]                      
Product Information [Line Items]                      
Revenues                 1,492 1,347 1,153
Other [Member] | North America [Member]                      
Product Information [Line Items]                      
Revenues                 546 708 1,175
Other [Member] | Europe [Member]                      
Product Information [Line Items]                      
Revenues                 539 656 1,033
Other [Member] | International Markets [Member]                      
Product Information [Line Items]                      
Revenues                 $ 271 $ 309 $ 385
[1] The data presented for prior periods have been revised to reflect a revision in the presentation of net revenues and cost of sales in the consolidated financial statements. See note 1b.