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Identifiable Intangible Assets - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets useful life			10 years
Amortization of intangible assets	$ 165	$ 199	$ 576	$ 613
Impairment of intangible assets excluding goodwill	$ 24	$ 21	$ 223	295
Minimum [Member] \| Measurement input, discount rate [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	8.5		8.5
Maximum [Member] \| Measurement input, discount rate [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	11.2		11.2
Generic Pipeline Products [Member] \| In Process Research And Development To Product Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill			$ 37	86
In Process Research and Development [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	7.25		7.25
In Process Research and Development [Member] \| Minimum [Member] \| Measurement input, discount rate [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	20		20
In Process Research and Development [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	8.5		8.5
In Process Research and Development [Member] \| Maximum [Member] \| Measurement input, discount rate [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	90		90
Identifiable product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill			$ 169	209
Actavis [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill				30
Actavis [Member] \| In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination recognized identifiable assets	$ 479		$ 479
United States [Member] \| Actavis [Member] \| Identifiable product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill				$ 179