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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment $ 18,930 $ 19,131
Accumulated amortization 13,543 12,861
Net carrying amount 5,387 6,270
Product rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 17,981 18,067
Accumulated amortization 13,274 12,630
Net carrying amount 4,707 5,437
Trade names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 583 577
Accumulated amortization 269 231
Net carrying amount 314 346
In-process research and development (IPR&D) [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 366 487
Accumulated amortization 0 0
Net carrying amount $ 366 $ 487