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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | $ 19,092 | $ 19,982
Accumulated amortization | 12,392 | 12,516
Net carrying amount | 6,700 | 7,466
Product rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 17,987 | 18,815
Accumulated amortization | 12,181 | 12,318
Net carrying amount | 5,806 | 6,497
Trade names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 570 | 590
Accumulated amortization | 211 | 198
Net carrying amount | 359 | 392
In process research and development [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 535 | 577
Net carrying amount | $ 535 | $ 577

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