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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | $ 20,510 | $ 21,182
Accumulated amortization | 12,390 | 12,259
Net carrying amount | 8,120 | 8,923
Identifiable product rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 19,226 | 19,650
Accumulated amortization | 12,171 | 12,094
Net carrying amount | 7,055 | 7,556
Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 648 | 621
Accumulated amortization | 219 | 165
Net carrying amount | 429 | 456
In Process Research and Development (IPR&D) [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 636 | 911
Net carrying amount | $ 636 | $ 911

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