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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment $ 16,764 $ 16,716
Accumulated amortization 12,575 12,298
Net carrying amount 4,189 4,418
Product rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 15,973 15,915
Accumulated amortization 12,265 11,998
Net carrying amount 3,708 3,917
Trade names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 579 568
Accumulated amortization 310 300
Net carrying amount 269 268
In process research and development [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 212 233
Accumulated amortization 0 0
Net carrying amount $ 212 $ 233