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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
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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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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