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Other assets impairments, restructuring and other items - Summary of Restructuring Accruals (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Restructuring Cost and Reserve [Line Items]    
Beginning balance $ (138) $ (122)
Provision (57) (81)
Utilization and other [1] 65 35
Ending balance (130) (168)
Employee termination costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning balance (131) (115)
Provision (52) (79)
Utilization and other [1] 59 33
Ending balance (124) (161)
Other Exit and Disposal [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning balance (7) (7)
Provision (5) (2)
Utilization and other [1] 6 2
Ending balance $ (6) $ (7)
[1] Includes adjustments for foreign currency translation.