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Financial Expenses-Net - Schedule of Financial Expenses (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Expenses [Line Items]      
Venezuela devaluation $ 0 $ 42 $ 746
Interest expenses and other bank charges 920 875 546
Income from investments (39) (84) (51)
Foreign exchange (gains) losses-net 13 65 (49)
Other, net 65 (3) 2
Other-than-temporary impairment 0   136
Total finance expense-net $ 959 $ 895 $ 1,330