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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
Mar. 31, 2020
Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 39 $ 32
Employee termination [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 33 20
Other [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 6 $ 12