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Other Assets Impairments, Restructuring and Other Items - Schedule of Other Assets Impairments, Restructuring and Other Items (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring and Impairment Costs [Line Items]      
Impairment of long-lived tangible assets $ 500 $ 544 $ 157
Contingent consideration 57 154 83
Acquisition, integration and related costs 13 105 261
Restructuring 488 535 245
Venezuela deconsolidation charge   396  
Other (71) 102 84
Total $ 987 $ 1,836 $ 830