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Identifiable Intangible Assets - Additional Information (Detail) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization of intangible assets useful life |  |  |  | 10 years |
Amortization of intangible assets | $ 173 |  | $ 249 | $ 414 | $ 507
Impairment of intangible assets excluding goodwill | $ 195 |  | 120 | 274 | 768
In Process Research And Development To Product Rights [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Prior periods adjustments |  |  |  | 162 |
lenalidomide [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Prior periods adjustments |  |  |  | $ 123 |
Minimum [Member] | Measurement input, discount rate [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Business combination, contingent consideration, liability, measurement input | 0.075 |  |  | 0.075 |
Maximum [Member] | Measurement input, discount rate [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Business combination, contingent consideration, liability, measurement input | 0.078 |  |  | 0.078 |
In Process Research and Development [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment of intangible assets excluding goodwill |  |  |  |  | 348
In Process Research and Development [Member] | Minimum [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Business combination, contingent consideration, liability, measurement input | 0.0725 |  |  | 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 | 20 |  |  | 20 |
In Process Research and Development [Member] | Maximum [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Business combination, contingent consideration, liability, measurement input | 0.10 |  |  | 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 | 90 |  |  | 90 |
Actavis [Member] | Generic Pipeline Products [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment of intangible assets excluding goodwill | $ 27 | $ 17 |  | $ 78 |
Actavis [Member] | In Process Research and Development [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Business combination recognized identifiable assets | 601 |  |  | 601 |
Actavis [Member] | In Process Research and Development [Member] | Generic Pipeline Products [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment of intangible assets excluding goodwill |  |  |  |  | 117
Actavis [Member] | Identifiable product rights [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment of intangible assets excluding goodwill | 168 |  | $ 103 | 196 | 420
AUSTEDO [Member] | In Process Research and Development [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment of intangible assets excluding goodwill |  |  |  |  | 211
Japan [Member] | Actavis [Member] | In Process Research and Development [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment of intangible assets excluding goodwill | 138 |  |  | 166 | 165
United States [Member] | Identifiable product rights [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment of intangible assets excluding goodwill | $ 30 |  |  | $ 30 | $ 232

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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=121586364&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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