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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment $ 18,714 $ 19,131
Accumulated amortization 13,189 12,861
Net carrying amount 5,525 6,270
Product rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 17,746 18,067
Accumulated amortization 12,932 12,630
Net carrying amount 4,814 5,437
Trade names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 574 577
Accumulated amortization 257 231
Net carrying amount 317 346
In process research and development [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 394 487
Accumulated amortization 0 0
Net carrying amount $ 394 $ 487