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Other assets impairments, restructuring and other items - Components of costs associated with restructuring plan including costs related to exit and disposal activities (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 29 $ 21 $ 196 $ 52
Employee termination [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 28 13 191 33
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 1 $ 8 $ 5 $ 19