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Commitments and Contingencies - Contingencies - Additional Information (Detail) € in Millions |  |  |  |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
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Nov. 02, 2021 USD ($) | Aug. 05, 2021 USD ($) | Jul. 21, 2021 USD ($) | Nov. 20, 2020 EUR (€) | Oct. 21, 2019 USD ($) | Aug. 21, 2017 USD ($) | Jul. 15, 2015 USD ($) | May 31, 2019 USD ($) | Aug. 31, 2012 USD ($) | Dec. 31, 2010 USD ($) | Aug. 31, 2008 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2014 USD ($) | Jul. 08, 2021 USD ($) | Feb. 01, 2021 USD ($) | Sep. 01, 2020 USD ($) | Jan. 31, 2009 USD ($) | Jul. 31, 2008 USD ($) | Feb. 28, 2005 USD ($)
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages assessment |  |  |  |  |  |  |  |  |  |  |  | $ 235,500,000 |  |  |  |  |  |  |  |  |  |
Annual sales at the time of settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000,000 | $ 350,000,000 |  |
Annual sales of Effexor |  |  |  |  |  | $ 2,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual sales of Lamictal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,300,000,000 | $ 950,000,000
Annual sales of Aggrenox |  |  |  |  |  |  | $ 1,100,000 |  |  |  | $ 416,000,000 |  |  |  |  |  |  |  |  |  |  |
Annual sales of Actos |  |  |  |  |  |  |  |  | $ 2,800,000,000 | $ 3,700,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Annual sales of Acto plus |  |  |  |  |  |  |  |  | $ 430,000,000 | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Annual Sales Of Sensipar |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000,000 |  |  |  |  |  |  |  |
Annual Sales Of Copaxone |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 380,000,000 |  |  |  |  |  |
Fines Imposed In Period | € |  |  |  | € 60.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, claims dismissed, value |  |  |  |  |  |  |  |  |  |  |  | 925,000 |  |  |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |
Loss contingencies on environmental laws, penalty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000 |  |  |  |  |
Loss Contingency Accrual, Provision |  | $ 235,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Opioid Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount |  |  |  |  | $ 25,000,000 |  |  | $ 85,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount awarded distribution period |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount awarded cash amount |  |  |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nationwide Settlement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount |  |  |  |  | 23,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount awarded cash amount |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nationwide Settlement [Member] | Four Other Defendants Other Than Teva [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency payment |  |  | $ 26,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount awarded distribution period |  |  | 18 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Laos [Member] | Opioid Litigation [Member] | Subsequent Event [Member] | Attorney General Of Louisana [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount awarded distribution period | 18 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount awarded cash amount distribution period | 18 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount distributable in kind | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eosinophilic Esophagitis [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damage claimed |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |
Eosinophilic Esophagitis [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damage claimed |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 |  |  |  |  |  |  |  |  |  |
Eosinophilic Esophagitis [Member] | Europe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damage claimed |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |
AndroGel Rate at 1% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual sales at the time of settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 140,000,000 |  |
Viread [Member] | Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual sales at the time of settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 582,000,000 |  |  |  |
Annual sales at the time of launch of the product |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 728,000,000 |  |  |  |  |  |  |
Tiruvada [Member] | Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual sales at the time of settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400,000,000 |  |  |  |
Annual sales at the time of launch of the product |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,100,000,000 |  |  |  |  |  |  |  |  |
Atripala [Member] | Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual sales at the time of settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,900,000,000 |  |  |  |
Annual sales at the time of launch of the product |  |  |  |  |  |  |  |  |  |  |  |  | $ 444,000,000 |  |  |  |  |  |  |  |  |
Colcys [Member] | Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual sales at the time of settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 187,000,000 |  |  |  |

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