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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
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

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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