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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ (13) $ 33 $ 69 $ 73
Employee termination [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges (19) 3 61 36
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 6 $ 30 $ 8 $ 36