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Other assets impairments, restructuring and other items - Schedule of Other Assets Impairments, Restructuring and Other Items (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring and Impairment Costs [Line Items]      
Impairments of long-lived tangible assets [1] $ 416 $ 139 $ 500
Contingent consideration (see note 2) (81) 59 57
Restructuring 120 199 488
Other 24 26 (58)
Total $ 479 $ 423 $ 987
[1] Including impairments related to exit and disposal activities