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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment $ 22,997 $ 23,661
Accumulated amortization 9,806 9,656
Net carrying amount 13,191 14,005
Identifiable product rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 20,201 20,361
Accumulated amortization 9,706 9,565
Net carrying amount 10,494 10,796
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 603 606
Accumulated amortization 100 91
Net carrying amount 503 515
In Process Research and Development [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 2,193 2,694
Accumulated amortization 0 0
Net carrying amount $ 2,193 $ 2,694