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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
Mar. 31, 2020
Mar. 31, 2019
Restructuring and Impairment Costs [Line Items]    
Impairments of long-lived tangible assets [1] $ 75 $ 20
Contingent consideration 6 (71)
Restructuring 39 32
Other   20
Total $ 121 $ 1
[1] Including impairments related to exit and disposal activities