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Identifiable Intangible Assets - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets useful life	10 years
Amortization of intangible assets	$ 802	$ 1,020	$ 1,113
2022	689
2023	711
2024	651
2025	630
2026	652
Impairment of intangible assets excluding goodwill	424	1,502	1,639
In Process Research And Development To Product Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Prior periods adjustments	192
lenalidomide [Member]
Finite-Lived Intangible Assets [Line Items]
Prior periods adjustments	$ 153
Minimum [Member] \| Measurement input, discount rate [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	7.5
Maximum [Member] \| Measurement input, discount rate [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	8.0
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
In Process Research and Development [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	0.0725
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	0.20
In Process Research and Development [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	0.10
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	0.90
In Process Research and Development [Member] \| Generic Pipeline Products [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	$ 127
Identifiable product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill		705	958
Identifiable product rights [Member] \| Lenalidomide Product [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	267
Actavis [Member] \| In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill		110	59
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	297	398	647
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
Japan [Member] \| Identifiable product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill		$ 165	$ 128
United States [Member] \| Actavis [Member] \| Identifiable product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	$ 30