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Accumulated Other Comprehensive Income (Loss) - Components of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Currency Translation Adjustments   $ 11 $ (25)
Derivative Financial Instruments $ 199 12 (8)
Defined Benefit Plans (4) (6) (7)
Total 195 17 (40)
Tax Effect [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Derivative Financial Instruments (77) (5) 2
Defined Benefit Plans 2 2 1
Total (75) (3) 3
Revenue [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Derivative Financial Instruments (19) (26) (16)
Total (19) (26) (16)
Cost of Revenue [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Derivative Financial Instruments 295 43 6
Total 295 43 6
Selling, General, and Administrative [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Defined Benefit Plans (6) (8) (8)
Total $ (6) (8) (8)
Other Income (Expense), Net [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Currency Translation Adjustments   11 (25)
Total   $ 11 $ (25)