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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | $ 19,705 | $ 19,982
Accumulated amortization | 12,589 | 12,516
Net carrying amount | 7,116 | 7,466
Product rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 18,544 | 18,815
Accumulated amortization | 12,383 | 12,318
Net carrying amount | 6,161 | 6,497
Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 588 | 590
Accumulated amortization | 206 | 198
Net carrying amount | 382 | 392
In process research and development [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 573 | 577
Net carrying amount | $ 573 | $ 577

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