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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment $ 21,182 $ 21,998
Accumulated amortization 12,259 10,766
Net carrying amount 8,923 11,232
Identifiable product rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 19,650 19,663
Accumulated amortization 12,094 10,640
Net carrying amount 7,556 9,023
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 621 600
Accumulated amortization 165 126
Net carrying amount 456 474
In Process Research and Development (IPR&D) [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 911 1,735
Net carrying amount $ 911 $ 1,735