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Goodwill - Summary of Changes in the Carrying Amount of Goodwill by Segment (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
Goodwill [Line Items]  
Beginning balance $ 15,147 [1]
Translation differences and other 797
Ending balance 15,945 [1]
United States [Member]  
Goodwill [Line Items]  
Beginning balance 5,732 [1]
Translation differences and other 0
Ending balance 5,732 [1]
Europe [Member]  
Goodwill [Line Items]  
Beginning balance 8,075 [1]
Translation differences and other 720
Ending balance 8,795 [1]
International Markets [Member]  
Goodwill [Line Items]  
Beginning balance 1,110 [1]
Translation differences and other 18
Ending balance 1,128 [1]
Other [Member] | Tevas API Reporting Unit [Member]  
Goodwill [Line Items]  
Beginning balance 0 [1]
Translation differences and other 0
Ending balance 0 [1]
Other [Member] | Medis Reporting Units [Member]  
Goodwill [Line Items]  
Beginning balance 232 [1]
Translation differences and other 59
Ending balance $ 291 [1]
[1] Cumulative goodwill impairment as of September 30, 2025 and December 31, 2024, was each approximately $29.6 billion.