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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment $ 21,128 $ 21,998
Accumulated amortization 11,819 10,766
Net carrying amount 9,308 11,232
Identifiable product rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 19,520 19,663
Accumulated amortization 11,665 10,640
Net carrying amount 7,856 9,023
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 609 600
Accumulated amortization 154 126
Net carrying amount 455 474
In Process Research and Development (IPR&D) [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 998 1,735
Net carrying amount $ 998 $ 1,735