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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Comprehensive Income [Abstract]    
Net income (loss) $ (5)us-gaap_NetIncomeLoss $ 106us-gaap_NetIncomeLoss
Net change in unrealized gains (losses), net of tax, on:    
Derivatives designated as cash flow hedges 11us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 14us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Other comprehensive income, net of tax 11us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 14us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Total comprehensive income $ 6us-gaap_ComprehensiveIncomeNetOfTax $ 120us-gaap_ComprehensiveIncomeNetOfTax