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Identifiable Intangible Assets - Schedule of Finite Lived Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount net of impairment	$ 24,559	$ 25,971
Accumulated amortization	9,214	8,331
Net carrying amount	15,345	17,640
Identifiable product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount net of impairment	21,094	21,011
Accumulated amortization	9,132	8,276
Net carrying amount	11,962	12,735
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount net of impairment	610	617
Accumulated amortization	82	55
Net carrying amount	528	562
In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount net of impairment	2,855	4,343
Net carrying amount	$ 2,855	$ 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.

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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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