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Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount net of impairment	$ 19,982	$ 21,182
Accumulated amortization	12,516	12,259
Net carrying amount	7,466	8,923
Identifiable product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount net of impairment	18,815	19,650
Accumulated amortization	12,318	12,094
Net carrying amount	6,497	7,556
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount net of impairment	590	621
Accumulated amortization	198	165
Net carrying amount	392	456
In Process Research and Development (IPR&D) [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount net of impairment	577	911
Net carrying amount	$ 577	$ 911

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- 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
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Amount before 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
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
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