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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment $ 17,139 $ 16,716
Accumulated amortization 13,203 12,298
Net carrying amount 3,936 4,418
Product rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 16,338 15,915
Accumulated amortization 12,872 11,998
Net carrying amount 3,466 3,917
Trade names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 595 568
Accumulated amortization 331 300
Net carrying amount 264 268
In process research and development [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 206 233
Accumulated amortization 0 0
Net carrying amount $ 206 $ 233