Identifiable Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets useful life	12 years
Amortization of intangible assets	$ 258	$ 283
Impairment of intangible assets excluding goodwill	649	469
In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	331	265
In Process Research and Development [Member] \| Lenalidomide Product [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill		125
Actavis [Member] \| In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination recognized identifiable assets	1,333
Impairment of intangible assets excluding goodwill		140
Actavis [Member] \| Identifiable product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	318
AUSTEDO [Member] \| In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	211
Japan [Member] \| Identifiable product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	165
Japan [Member] \| Actavis [Member] \| Identifiable product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	138
United States [Member] \| Actavis [Member] \| In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	$ 106	$ 204

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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-Publisher FASB
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- Definition

Amount of assets acquired at the acquisition date.

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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