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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment $ 20,510 $ 21,182
Accumulated amortization 12,390 12,259
Net carrying amount 8,120 8,923
Identifiable product rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 19,226 19,650
Accumulated amortization 12,171 12,094
Net carrying amount 7,055 7,556
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 648 621
Accumulated amortization 219 165
Net carrying amount 429 456
In Process Research and Development (IPR&D) [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 636 911
Net carrying amount $ 636 $ 911