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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment $ 17,178 $ 18,930
Accumulated amortization 12,122 13,543
Net carrying amount 5,056 5,387
Product rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 16,261 17,981
Accumulated amortization 11,846 13,274
Net carrying amount 4,415 4,707
Trade names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 576 583
Accumulated amortization 276 269
Net carrying amount 300 314
In process research and development [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 341 366
Accumulated amortization 0 0
Net carrying amount $ 341 $ 366