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Other assets impairments, restructuring and other items - Summary of Restructuring Accruals (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2020
USD ($)
Restructuring Cost and Reserve [Line Items]  
Beginning balance $ (215)
Provision (82)
Utilization and other 188 [1]
Ending balance (109)
Employee termination costs [Member]  
Restructuring Cost and Reserve [Line Items]  
Beginning balance (208)
Provision (39)
Utilization and other 145 [1]
Ending balance (102)
Other [Member]  
Restructuring Cost and Reserve [Line Items]  
Beginning balance (7)
Provision (43)
Utilization and other 43 [1]
Ending balance $ (7)
[1] Includes adjustments for foreign currency translation.