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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | $ 19,139 | $ 19,131
Accumulated amortization | 13,175 | 12,861
Net carrying amount | 5,964 | 6,270
Product rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 18,094 | 18,067
Accumulated amortization | 12,934 | 12,630
Net carrying amount | 5,160 | 5,437
Trade names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 583 | 577
Accumulated amortization | 241 | 231
Net carrying amount | 342 | 346
In process research and development [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 462 | 487
Net carrying amount | $ 462 | $ 487

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