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Commitments and Contingencies - Contingencies - Additional Information (Detail) $ in Millions, $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
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Oct. 21, 2019 USD ($) Number | Jun. 27, 2018 CAD ($) | Aug. 21, 2017 USD ($) | May 31, 2019 USD ($) | Jul. 31, 2015 USD ($) | Sep. 30, 2013 USD ($) | Apr. 30, 2013 USD ($) | Aug. 31, 2012 USD ($) | Dec. 31, 2010 USD ($) | Nov. 30, 2009 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2014 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CAD ($) | May 31, 2015 USD ($) | Jan. 31, 2009 USD ($) | Jul. 31, 2008 USD ($) | Feb. 28, 2005 USD ($)
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages assessment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 235.5 |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 94 |  |  |  |  |  |
Modafinil payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200.0 |  |  |
Annual sales at the time of settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 700.0 |  |  | $ 350.0 |  |
Annual sales of Effexor |  |  | $ 2,600.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual sales of Lamictal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,300.0 | $ 950.0
Annual sales of Niaspan |  |  |  |  |  | $ 1,100.0 | $ 416.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Annual sales of Actos |  |  |  |  |  |  |  | $ 2,800.0 | $ 3,700.0 |  |  |  |  |  |  |  |  |  |  |
Annual sales of Acto plus |  |  |  |  |  |  |  | $ 430.0 | $ 500.0 |  |  |  |  |  |  |  |  |  |  |
Annual sales of Namenda |  |  |  |  | $ 550.0 |  |  |  |  | $ 1,100.0 |  |  |  |  |  |  |  |  |  |
Loss contingency payment |  |  |  |  |  |  |  |  |  |  |  | $ 25.0 |  |  |  |  |  |  |  |
Annual Sales Of Sensipar |  |  |  |  |  |  |  |  |  |  | $ 1,400.0 |  |  |  |  |  |  |  |  |
Modafinil payment remaining balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19.0 |  |  |  |  |
Annual sales of Copaxone |  |  |  |  |  |  |  |  |  |  |  |  | $ 431.0 |  |  |  |  |  |  |
Generic modafinil, and imposed fines amount |  |  |  |  |  |  |  |  |  |  | $ 1,580.0 |  |  |  | 1,625.0 |  |  |  |  |
Opioid Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount |  |  |  | $ 85.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount awarded distribution period | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount awarded cash amount | $ 20.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount awarded number of installments | Number | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount awarded cash amount distribution period | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nationwide Settlement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount | $ 23,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount awarded distribution period | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount awarded cash amount | $ 250.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount awarded cash amount distribution period | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Modafinil Settlement Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generic modafinil, and imposed fines amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 60.5 |  |  |  |  |
Eosinophilic Esophagitis [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damage claimed |  |  |  |  |  |  |  |  |  |  |  | 200.0 |  |  |  |  |  |  |  |
Eosinophilic Esophagitis [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damage claimed |  |  |  |  |  |  |  |  |  |  |  | 150.0 |  |  |  |  |  |  |  |
Eosinophilic Esophagitis [Member] | Europe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damage claimed |  |  |  |  |  |  |  |  |  |  |  | $ 50.0 |  |  |  |  |  |  |  |
Janssen and Millennium [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum damages payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200 |  |  |  |
Litigation settlement awarded from other party |  | $ 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AndroGel Rate at 1% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual sales at the time of settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 140.0 |  |

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