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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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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

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