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Goodwill - Summary of Changes in the Carrying Amount of Goodwill by Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Goodwill [Line Items]    
Beginning balance $ 17,177 $ 17,177 [1]
Goodwill allocation related to the shift of Canada to International Markets   0
Goodwill reclassified as assets held for sale (48)  
Translation differences (122)  
Ending balance 17,007 [1] 17,177
North America [Member]    
Goodwill [Line Items]    
Beginning balance 0 6,459 [1]
Goodwill allocation related to the shift of Canada to International Markets   (6,459)
Goodwill reclassified as assets held for sale 0  
Translation differences 0  
Ending balance 0 [1] 0
Europe [Member]    
Goodwill [Line Items]    
Beginning balance 8,466 8,466 [1]
Goodwill allocation related to the shift of Canada to International Markets   0
Goodwill reclassified as assets held for sale 0  
Translation differences (104)  
Ending balance 8,362 [1] 8,466
International Markets [Member]    
Goodwill [Line Items]    
Beginning balance 1,321 675 [1]
Goodwill allocation related to the shift of Canada to International Markets   646
Goodwill reclassified as assets held for sale (48)  
Translation differences 6  
Ending balance 1,279 [1] 1,321
Other [Member] | Medis Reporting Units [Member]    
Goodwill [Line Items]    
Beginning balance 265 265 [1]
Goodwill allocation related to the shift of Canada to International Markets   0
Goodwill reclassified as assets held for sale 0  
Translation differences (10)  
Ending balance 255 [1] 265
Other [Member] | Tevas API Reporting Unit [Member]    
Goodwill [Line Items]    
Beginning balance 1,313 1,313 [1]
Goodwill allocation related to the shift of Canada to International Markets   0
Goodwill reclassified as assets held for sale 0  
Translation differences (14)  
Ending balance 1,299 [1] 1,313
United States [Member]    
Goodwill [Line Items]    
Beginning balance 5,813 0 [1]
Goodwill allocation related to the shift of Canada to International Markets   5,813
Goodwill reclassified as assets held for sale 0  
Translation differences 0  
Ending balance $ 5,813 [1] $ 5,813
[1] Cumulative goodwill impairment as of March 31, 2024 and December 31, 2023 was approximately $28.3 billion.