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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment $ 22,587 $ 23,661
Accumulated amortization 10,152 9,656
Net carrying amount 12,435 14,005
Identifiable product rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 19,995 20,361
Accumulated amortization 10,043 9,565
Net carrying amount 9,952 10,796
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 604 606
Accumulated amortization 109 91
Net carrying amount 496 515
In Process Research and Development [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 1,988 2,694
Net carrying amount $ 1,988 $ 2,694