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Other assets impairments, restructuring and other items - Summary of Restructuring Accruals (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2019
USD ($)
Restructuring Cost and Reserve [Line Items]  
Beginning balance $ (233)
Provision (140)
Utilization and other 164 [1]
Ending balance (208)
Employee termination costs [Member]  
Restructuring Cost and Reserve [Line Items]  
Beginning balance (204)
Provision (105)
Utilization and other 108 [1]
Ending balance (201)
Other [Member]  
Restructuring Cost and Reserve [Line Items]  
Beginning balance (29)
Provision (34)
Utilization and other 56 [1]
Ending balance $ (7)
[1] Includes adjustments for foreign currency translation.