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Legal Settlements and Loss Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Loss Contingencies [Line Items] |  |  |  |  |
Legal settlements and loss contingencies, expense | $ 21 | $ 468 | $ 10 | $ 1,171 |
Accrued amount for legal settlements and loss contingencies | $ 1,624 |  | $ 1,624 |  | $ 1,580
Settlement On Account Of Product Liability [Member] | United States [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Restructuring expense and income |  |  | 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).The expense in the first nine months of 2019 was mainly related to an estimated settlement provision recorded in connection with the opioid cases. |  |

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- Definition Restructuring expense and income + References No definition available. + 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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