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Other assets impairments, restructuring and other items - Schedule of Other Assets Impairments, Restructuring and Other Items (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Restructuring and Impairment Costs [Line Items]        
Impairments of long-lived tangible assets [1] $ 56 $ 28 $ 408 $ 96
Contingent consideration (179) 51 (96) 4
Restructuring 9 61 82 140
Other 15 21 10 24
Total $ (98) $ 160 $ 404 $ 263
[1] Including impairments related to exit and disposal activities