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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
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 120 $ 199 $ 488
Employee termination [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 71 159 410
Other [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 49 $ 40 $ 78