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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment $ 19,092 $ 19,982
Accumulated amortization 12,392 12,516
Net carrying amount 6,700 7,466
Product rights    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 17,987 18,815
Accumulated amortization 12,181 12,318
Net carrying amount 5,806 6,497
Trade names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 570 590
Accumulated amortization 211 198
Net carrying amount 359 392
In process research and development [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 535 577
Net carrying amount $ 535 $ 577