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Other assets impairments, restructuring and other items - Summary of Restructuring Accruals (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]    
Beginning balance $ (119) $ (138)
Provision (93) (117)
Utilization and other [1] 130 136
Ending balance (82) (119)
Employee termination costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning balance (112) (131)
Provision (40) (95)
Utilization and other [1] 77 114
Ending balance (75) (112)
Other Exit and Disposal [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning balance (7) (7)
Provision (53) (22)
Utilization and other [1] 53 22
Ending balance $ (7) $ (7)
[1] Includes adjustments for foreign currency translation.