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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Restructuring and Impairment Costs [Line Items]        
Impairments of long-lived tangible assets [1] $ 28 $ 2 $ 96 $ 255
Contingent consideration 51 29 4 84
Restructuring 61 88 140 442
Other 21 20 24 53
Total $ 160 $ 139 $ 263 $ 834
[1] Including impairments related to exit and disposal activities