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Commitments and Contingencies - Contingencies - Additional Information (Detail)
€ in Millions
 1 Months Ended 9 Months Ended 12 Months Ended
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