v3.26.3
Goodwill - Summary of Changes in the Carrying Amount of Goodwill by Segment (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2026
Dec. 31, 2025
Goodwill [Roll Forward]    
Beginning balance $ 16,000  
Goodwill reclassified as assets held for sale (16)  
Translation differences and other (242)  
Ending balance 15,742  
Accumulated goodwill impairment 29,600 $ 29,600
Previously reported    
Goodwill [Roll Forward]    
Beginning balance 16,000  
Goodwill allocation related to the shift of Anda to Other Activities    
Goodwill [Roll Forward]    
Beginning balance 0  
Other Activities    
Goodwill [Roll Forward]    
Beginning balance 476  
Goodwill reclassified as assets held for sale 0  
Translation differences and other (16)  
Ending balance 460  
Other Activities | Previously reported    
Goodwill [Roll Forward]    
Beginning balance 292  
Other Activities | Goodwill allocation related to the shift of Anda to Other Activities    
Goodwill [Roll Forward]    
Beginning balance 184  
United States | Operating segments    
Goodwill [Roll Forward]    
Beginning balance 5,548  
Goodwill reclassified as assets held for sale (6)  
Translation differences and other 0  
Ending balance 5,542  
United States | Operating segments | Previously reported    
Goodwill [Roll Forward]    
Beginning balance 5,732  
United States | Operating segments | Goodwill allocation related to the shift of Anda to Other Activities    
Goodwill [Roll Forward]    
Beginning balance (184)  
Europe | Operating segments    
Goodwill [Roll Forward]    
Beginning balance 8,812  
Goodwill reclassified as assets held for sale (10)  
Translation differences and other (229)  
Ending balance 8,573  
Europe | Operating segments | Previously reported    
Goodwill [Roll Forward]    
Beginning balance 8,812  
Europe | Operating segments | Goodwill allocation related to the shift of Anda to Other Activities    
Goodwill [Roll Forward]    
Beginning balance 0  
International Markets | Operating segments    
Goodwill [Roll Forward]    
Beginning balance 1,166  
Goodwill reclassified as assets held for sale 0  
Translation differences and other 3  
Ending balance 1,169  
International Markets | Operating segments | Previously reported    
Goodwill [Roll Forward]    
Beginning balance 1,166  
International Markets | Operating segments | Goodwill allocation related to the shift of Anda to Other Activities    
Goodwill [Roll Forward]    
Beginning balance $ 0