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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | $ 22,177 | $ 23,661
Accumulated amortization | 10,299 | 9,656
Net carrying amount | 11,878 | 14,005
Identifiable product rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 19,698 | 20,361
Accumulated amortization | 10,182 | 9,565
Net carrying amount | 9,516 | 10,796
Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 596 | 606
Accumulated amortization | 117 | 91
Net carrying amount | 479 | 515
In Process Research and Development [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 1,883 | 2,694
Net carrying amount | $ 1,883 | $ 2,694

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