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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | $ 23,661 | $ 25,971
Accumulated amortization | 9,656 | 8,331
Net carrying amount | 14,005 | 17,640
Identifiable product rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 20,361 | 21,011
Accumulated amortization | 9,565 | 8,276
Net carrying amount | 10,796 | 12,735
Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 606 | 617
Accumulated amortization | 91 | 55
Net carrying amount | 515 | 562
In Process Research and Development [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount net of impairment | 2,694 | 4,343
Net carrying amount | $ 2,694 | $ 4,343

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