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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, 2019
Mar. 31, 2018
Restructuring and Impairment Costs [Line Items]    
Impairments of long-lived tangible assets $ 20 $ 226
Contingent consideration (71) 8
Restructuring 32 247
Other 20 20
Total $ 1 $ 501