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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Product Information [Line Items]                      
Revenues $ 4,559 $ 4,529 $ 4,701 $ 5,065 $ 5,398 $ 5,617 $ 5,720 $ 5,650 $ 18,854 $ 22,385 $ 21,903
North America [Member]                      
Product Information [Line Items]                      
Revenues                 9,297 12,141 11,778
Europe [Member]                      
Product Information [Line Items]                      
Revenues                 5,186 5,466 4,969
International Markets [Member]                      
Product Information [Line Items]                      
Revenues                 3,005 3,395 4,015
Generic products [Member] | North America [Member]                      
Product Information [Line Items]                      
Revenues                 4,056 5,203 4,654
Generic products [Member] | Europe [Member]                      
Product Information [Line Items]                      
Revenues                 3,593 3,471 3,155
Generic products [Member] | International Markets [Member]                      
Product Information [Line Items]                      
Revenues                 2,022 2,370 3,129
COPAXONE [Member] | North America [Member]                      
Product Information [Line Items]                      
Revenues                 1,759 3,116 3,543
COPAXONE [Member] | Europe [Member]                      
Product Information [Line Items]                      
Revenues                 535 595 585
COPAXONE [Member] | International Markets [Member]                      
Product Information [Line Items]                      
Revenues                 72 91 95
BENDEKA and TREANDA [Member] | North America [Member]                      
Product Information [Line Items]                      
Revenues                 642 656 661
ProAir [Member] | North America [Member]                      
Product Information [Line Items]                      
Revenues                 397 501 565
QVAR [Member] | North America [Member]                      
Product Information [Line Items]                      
Revenues                 182 313 409
AUSTEDO [Member] | North America [Member]                      
Product Information [Line Items]                      
Revenues                 204 24  
Distribution [Member] | International Markets [Member]                      
Product Information [Line Items]                      
Revenues                 602 550 458
Respiratory Product [Member] | Europe [Member]                      
Product Information [Line Items]                      
Revenues                 402 368 239
Anda [Member] | North America [Member]                      
Product Information [Line Items]                      
Revenues                 1,347 1,153 301
Other Products [Member] | North America [Member]                      
Product Information [Line Items]                      
Revenues                 710 1,175 1,645
Other Products [Member] | Europe [Member]                      
Product Information [Line Items]                      
Revenues                 656 1,032 990
Other Products [Member] | International Markets [Member]                      
Product Information [Line Items]                      
Revenues                 $ 309 $ 384 $ 333