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Other assets impairments, restructuring and other items - Summary of Restructuring Accruals (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]    
Beginning balance $ (68) $ (82)
Provision (196) (52)
Utilization and other [1] 96 64
Ending balance (168) (70)
Employee termination costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning balance (55) (75)
Provision (191) (33)
Utilization and other [1] 92 52
Ending balance (154) (56)
Other Exit and Disposal [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning balance (13) (7)
Provision (5) (19)
Utilization and other [1] 4 12
Ending balance $ (14) $ (14)
[1] Includes adjustments for foreign currency translation.