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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 47 $ 107 $ 79 $ 354
Employee termination [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 36 90 56 318
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 11 $ 17 $ 23 $ 36