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Identifiable Intangible Assets - Schedule of Finite Lived Intangible Assets (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment $ 26,106 $ 25,971
Accumulated amortization 8,792 8,331
Net carrying amount 17,314 17,640
Identifiable product rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 21,395 21,011
Accumulated amortization 8,728 8,276
Net carrying amount 12,667 12,735
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 618 617
Accumulated amortization 64 55
Net carrying amount 554 562
In Process Research and Development [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 4,093 4,343
Net carrying amount $ 4,093 $ 4,343