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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Restructuring and Impairment Costs [Line Items]        
Impairments of long-lived tangible assets [1] $ 277 $ 48 $ 352 $ 68
Contingent consideration 76 24 83 (47)
Restructuring 33 47 73 79
Other (6) (18) (5) 3
Total $ 381 $ 101 $ 502 $ 103
[1] Including impairments related to exit and disposal activities