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Other assets impairments, restructuring and other items - Summary of Restructuring Accruals (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]    
Beginning balance $ (215) $ (233)
Provision (120) (199)
Utilization and other [1] 213 217
Ending balance (122) (215)
Employee termination costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning balance (208) (204)
Provision (71) (159)
Utilization and other [1] 164 155
Ending balance (115) (208)
Other Exit and Disposal [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning balance (7) (29)
Provision (49) (40)
Utilization and other [1] 49 62
Ending balance $ (7) $ (7)
[1] Includes adjustments for foreign currency translation.