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Goodwill - Summary of Changes in the Carrying Amount of Goodwill by Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Goodwill [Line Items]              
Beginning balance       $ 17,177 [1] $ 17,177 $ 17,177 [1] $ 17,177 [1]
Goodwill allocation related to the shift of Canada to International Markets             0
Goodwill impairment $ (600) $ (400) $ 0   (1,000) (700)  
Goodwill reclassified as assets held for sale         (29)    
Translation differences         (25)    
Ending balance 16,124 [1]       16,124 [1]   17,177
North America [Member]              
Goodwill [Line Items]              
Beginning balance       6,459 [1] 0 6,459 [1] 6,459 [1]
Goodwill allocation related to the shift of Canada to International Markets             (6,459)
Goodwill impairment         0    
Goodwill reclassified as assets held for sale         0    
Translation differences         0    
Ending balance 0 [1]       0 [1]   0
Europe [Member]              
Goodwill [Line Items]              
Beginning balance       8,466 [1] 8,466 8,466 [1] 8,466 [1]
Goodwill allocation related to the shift of Canada to International Markets             0
Goodwill impairment         0    
Goodwill reclassified as assets held for sale         0    
Translation differences         97    
Ending balance 8,563 [1]       8,563 [1]   8,466
International Markets [Member]              
Goodwill [Line Items]              
Beginning balance       675 [1] 1,321 675 [1] 675 [1]
Goodwill allocation related to the shift of Canada to International Markets             646
Goodwill impairment       (700) 0    
Goodwill reclassified as assets held for sale         (29)    
Translation differences         (131)    
Ending balance 1,161 [1]       1,161 [1]   1,321
Other [Member] | Medis Reporting Units [Member]              
Goodwill [Line Items]              
Beginning balance       265 [1] 265 265 [1] 265 [1]
Goodwill allocation related to the shift of Canada to International Markets             0
Goodwill impairment         0    
Goodwill reclassified as assets held for sale         0    
Translation differences         4    
Ending balance 269 [1]       269 [1]   265
Other [Member] | Tevas API Reporting Unit [Member]              
Goodwill [Line Items]              
Beginning balance       1,313 [1] 1,313 1,313 [1] 1,313 [1]
Goodwill allocation related to the shift of Canada to International Markets             0
Goodwill impairment         (1,000)    
Goodwill reclassified as assets held for sale         0    
Translation differences         5    
Ending balance 318 [1]       318 [1]   1,313
United States [Member]              
Goodwill [Line Items]              
Beginning balance       $ 0 [1] 5,813 $ 0 [1] 0 [1]
Goodwill allocation related to the shift of Canada to International Markets             5,813
Goodwill impairment         0    
Goodwill reclassified as assets held for sale         0    
Translation differences         0    
Ending balance $ 5,813 [1]       $ 5,813 [1]   $ 5,813
[1] Cumulative goodwill impairment as of September 30, 2024 and December 31, 2023 was approximately $29.0 billion and $28.3 billion, respectively.