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Accumulated Other Comprehensive Income (Loss) - Components of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Revenue $ 1,795 $ 1,741
Cost of revenue 1,508 1,532
Tax effect 3 (13)
Net loss (68) (122)
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Revenue (1) (5)
Cost of revenue (4) (4)
Tax effect 2 4
Net loss (3) (5)
Derivative Financial Instruments, Net of Tax [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Revenue (1) (5)
Cost of revenue (4) (4)
Tax effect 2 4
Net loss $ (3) $ (5)