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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | $ 16,716 | $ 18,930
Accumulated amortization | 12,298 | 13,543
Net carrying amount | 4,418 | 5,387
Product rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 15,915 | 17,981
Accumulated amortization | 11,998 | 13,274
Net carrying amount | 3,917 | 4,707
Trade names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 568 | 583
Accumulated amortization | 300 | 269
Net carrying amount | 268 | 314
In process research and development [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 233 | 366
Accumulated amortization | 0 | 0
Net carrying amount | $ 233 | $ 366

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