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Identifiable Intangible Assets - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets useful life	10 years
Amortization of intangible assets	$ 1,020	$ 1,113	$ 1,166
2021	812
2022	764
2023	744
2024	705
2025	723
Impairment of intangible assets excluding goodwill	1,502	1,639	1,991
Lenalidomide Product [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	262	125
In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	$ 797	681	923
Business combination, contingent consideration, liability, measurement input	80
In Process Research and Development [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	7.5
In Process Research and Development [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	9
Identifiable product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	$ 705	958
Actavis [Member] \| In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination recognized identifiable assets	877
Impairment of intangible assets excluding goodwill	110	59	1,068
Actavis [Member] \| In Process Research and Development [Member] \| Lenalidomide Product [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	300	497
Actavis [Member] \| Identifiable product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	398	647	412
AUSTEDO [Member] \| In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	211
International Markets [Member] \| Discontinued business [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill		123
International Markets [Member] \| Actavis [Member] \| In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill			290
Japan [Member] \| Identifiable product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	$ 165	$ 128
Japan [Member] \| Actavis [Member] \| In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill			$ 222