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Legal Settlements and Loss Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Loss Contingencies [Line Items] |  |  |
Legal settlements and loss contingencies, expense | $ 60 | $ 1,178 |
Legal settlements, income |  |  | $ 1,208
Accrued amount for legal settlements and loss contingencies | $ 1,625 | $ 1,580 |
Settlement On Account Of Product Liability [Member] | United States [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Restructuring expense and income | The expenses in 2020 were mainly related to a fine imposed by the European Commission in relation to a 2005 patent settlement agreement and an increase of a reserve for certain product liability claims in the United States, 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 expenses in 2019 were mainly related to an estimated provision recorded in connection with potential settlement of the opioid cases. |  |

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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 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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