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Legal Settlements and Loss Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Loss Contingencies [Line Items] |  |  |  |  |
Legal settlements and loss contingencies, expense | $ 3 | $ 21 | $ 113 |  |
Legal settlements, income |  |  |  | $ 10 |
Accrued amount for legal settlements and loss contingencies | $ 2,009 |  | $ 2,009 |  | $ 1,625
Restructuring expense and income | The expense in the third quarter of 2020 was mainly due to settling, in part, antitrust claims challenging a patent settlement agreement, partially offset by proceeds received following a settlement of an action brought against the sellers of Auden McKenzie (an acquisition made by Actavis Generics). |  | The expense in the first nine months of 2021 was mainly due to the provision for the carvedilol patent litigation (see note 10). The expense in the first nine months of 2020 was mainly related to an increase of a reserve for certain legal expenses and settlement contributions related to product liability claims in the United States and partially settling antitrust claims challenging a patent settlement agreement, partially offset by proceeds received following a settlement of the FCPA derivative proceedings in Israel and settlement of an action brought against the sellers of Auden McKenzie (an acquisition made by Actavis Generics). |  |

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- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
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- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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