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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Restructuring and Impairment Costs [Line Items]        
Impairments of long-lived tangible assets [1] $ 48 $ 27 $ 68 $ 253
Contingent consideration 24 47 (47) 55
Restructuring 47 107 79 354
Other (18) 13 3 33
Total $ 101 $ 194 $ 103 $ 695
[1] Including impairments related to exit and disposal activities