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Segments - Schedule of Revenues by Major Products and Activities (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Product Information [Line Items]    
Revenues $ 4,295 $ 5,065
North America [Member]    
Product Information [Line Items]    
Revenues 2,047 2,531
Europe [Member]    
Product Information [Line Items]    
Revenues 1,264 1,442
International Markets [Member]    
Product Information [Line Items]    
Revenues 668 750
Generic products [Member]    
Product Information [Line Items]    
Revenues 441 488
Generic products [Member] | North America [Member]    
Product Information [Line Items]    
Revenues 966 1,088
Generic products [Member] | Europe [Member]    
Product Information [Line Items]    
Revenues 919 997
COPAXONE [Member]    
Product Information [Line Items]    
Revenues 13 16
COPAXONE [Member] | North America [Member]    
Product Information [Line Items]    
Revenues 208 476
COPAXONE [Member] | Europe [Member]    
Product Information [Line Items]    
Revenues 114 153
BENDEKA and TREANDA [Member] | North America [Member]    
Product Information [Line Items]    
Revenues 122 181
ProAir [Member] | North America [Member]    
Product Information [Line Items]    
Revenues 59 130
QVAR [Member] | North America [Member]    
Product Information [Line Items]    
Revenues 64 107
AUSTEDO [Member] | North America [Member]    
Product Information [Line Items]    
Revenues 74 30
Distribution [Member]    
Product Information [Line Items]    
Revenues 151 153
Respiratory Product [Member] | Europe [Member]    
Product Information [Line Items]    
Revenues 91 113
Anda [Member] | North America [Member]    
Product Information [Line Items]    
Revenues 379 331
Other [Member]    
Product Information [Line Items]    
Revenues 62 93
Other [Member] | North America [Member]    
Product Information [Line Items]    
Revenues 155 188
Other [Member] | Europe [Member]    
Product Information [Line Items]    
Revenues 140 $ 179
AJOVY [Member] | North America [Member]    
Product Information [Line Items]    
Revenues $ 20