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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment $ 19,139 $ 19,131
Accumulated amortization 13,175 12,861
Net carrying amount 5,964 6,270
Product rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 18,094 18,067
Accumulated amortization 12,934 12,630
Net carrying amount 5,160 5,437
Trade names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 583 577
Accumulated amortization 241 231
Net carrying amount 342 346
In process research and development [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 462 487
Net carrying amount $ 462 $ 487