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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | $ 21,128 | $ 21,998
Accumulated amortization | 11,819 | 10,766
Net carrying amount | 9,308 | 11,232
Identifiable product rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 19,520 | 19,663
Accumulated amortization | 11,665 | 10,640
Net carrying amount | 7,856 | 9,023
Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 609 | 600
Accumulated amortization | 154 | 126
Net carrying amount | 455 | 474
In Process Research and Development (IPR&D) [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 998 | 1,735
Net carrying amount | $ 998 | $ 1,735

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