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Identifiable Intangible Assets - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets useful life			12 years
Amortization of intangible assets	$ 251	$ 255	$ 758	$ 823
Impairment of intangible assets excluding goodwill	509	177	1,278	1,206
In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	$ 360		$ 708	539
Business combination, contingent consideration, liability, measurement input	0.80		0.80
In Process Research and Development [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	0.075		0.075
In Process Research and Development [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	0.09		0.09
In Process Research and Development [Member] \| Lenalidomide Product [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	$ 262		$ 262	125
Identifiable product rights [Member] \| Market assumptions regarding price and volume of products [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	39
Identifiable product rights [Member] \| Metformin tablets product [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	110		110
Actavis [Member] \| In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination recognized identifiable assets	964		964
Impairment of intangible assets excluding goodwill				59
Actavis [Member] \| In Process Research and Development [Member] \| Generic Pipeline Products [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	96	78	213	355
Actavis [Member] \| Identifiable product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	$ 149	$ 99	570	$ 667
AUSTEDO [Member] \| In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill			211
Japan [Member] \| Actavis [Member] \| In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill			165
United States [Member] \| Actavis [Member] \| In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill			$ 271