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Identifiable Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets useful life | 12 years |  |
Amortization of intangible assets | $ 1,113 | $ 1,166 | $ 1,444
2020 | 1,019 |  |
2021 | 856 |  |
2022 | 794 |  |
2023 | 790 |  |
2024 | 773 |  |
IPR&D to product rights | 291 |  |
Impairment of intangible assets excluding goodwill | 1,639 | $ 1,991 | $ 3,238
In Process Research and Development [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment of intangible assets excluding goodwill | 681 |  |
In Process Research and Development [Member] | Lenalidomide Product [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment of intangible assets excluding goodwill | 125 |  |
Identifiable product rights [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment of intangible assets excluding goodwill | 958 |  |
Actavis [Member] | In Process Research and Development [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Business combination recognized identifiable assets | 1,453 |  |
Impairment of intangible assets excluding goodwill | 59 |  |
Actavis [Member] | In Process Research and Development [Member] | Lenalidomide Product [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment of intangible assets excluding goodwill | 497 |  |
Actavis [Member] | Identifiable product rights [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment of intangible assets excluding goodwill | 647 |  |
Rimsa [Member] | In Process Research and Development [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Business combination recognized identifiable assets | 48 |  |
AUSTEDO [Member] | In Process Research and Development [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Business combination recognized identifiable assets | 211 |  |
Fremanezumab [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
IPR&D to product rights | 174 |  |
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 | $ 128 |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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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. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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