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Other assets impairments, restructuring and other items - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restructuring and Impairment Costs [Line Items]        
Impairments of long-lived tangible assets [1] $ 26 $ 56 $ 106 $ 408
Restructuring costs 28 9 96 82
Business combination contingent consideration arrangements change in amount of contingent consideration liability $ (9) $ 179 $ 7 $ 96
[1] Including impairments related to exit and disposal activities.