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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair market value adjustment on cash flow hedges, tax (benefit) provision $ 2 $ 0
Cost of Services    
Reclassification adjustment for net realized (gains) losses on cash flow hedges, tax 0 0
Interest Expense    
Reclassification adjustment for net realized (gains) losses on cash flow hedges, tax $ 4 $ 5