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Identifiable Intangible Assets - Additional Information (Detail) $ in Millions | 12 Months Ended
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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

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