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Other assets impairments, restructuring and other items - Summary of Restructuring Accruals (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
Restructuring Cost and Reserve [Line Items]  
Beginning balance $ (233)
Provision (32)
Utilization and other 66 [1]
Ending balance (199)
Employee termination costs [Member]  
Restructuring Cost and Reserve [Line Items]  
Beginning balance (204)
Provision (20)
Utilization and other 32 [1]
Ending balance (192)
Other [Member]  
Restructuring Cost and Reserve [Line Items]  
Beginning balance (29)
Provision (12)
Utilization and other 34 [1]
Ending balance $ (7)
[1] Includes adjustments for foreign currency translation.