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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 28 $ 9 $ 96 $ 82
Employee termination [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 24 3 84 39
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 4 $ 7 $ 12 $ 43