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Other assets impairments, restructuring and other items - Components of costs associated with restructuring plan including costs related to exit and disposal activities (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 61 $ 88 $ 140 $ 442
Employee termination [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 49 62 105 380
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 11 $ 26 $ 34 $ 62