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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | $ 21,998 | $ 23,661
Accumulated amortization | 10,766 | 9,656
Net carrying amount | 11,232 | 14,005
Identifiable product rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 19,663 | 20,361
Accumulated amortization | 10,640 | 9,565
Net carrying amount | 9,023 | 10,796
Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 600 | 606
Accumulated amortization | 126 | 91
Net carrying amount | 474 | 515
In Process Research and Development (IPR&D) [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 1,735 | 2,694
Net carrying amount | $ 1,735 | $ 2,694

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