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Consolidated Condensed Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net loss $ (7)us-gaap_ProfitLoss $ (13)us-gaap_ProfitLoss
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization expense(1) 171us-gaap_DepreciationDepletionAndAmortization [1] 164us-gaap_DepreciationDepletionAndAmortization [1]
Deferred income taxes 0us-gaap_IncreaseDecreaseInDeferredIncomeTaxes (13)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Mark-to-market activity, net (71)us-gaap_UnrealizedGainLossOnDerivatives [2] 72us-gaap_UnrealizedGainLossOnDerivatives [2]
(Income) from unconsolidated investments in power plants (5)us-gaap_IncomeLossFromEquityMethodInvestments (9)us-gaap_IncomeLossFromEquityMethodInvestments
Return on unconsolidated investments in power plants 0us-gaap_EquityMethodInvestmentDividendsOrDistributions 13us-gaap_EquityMethodInvestmentDividendsOrDistributions
Stock-based compensation expense 11us-gaap_ShareBasedCompensation 10us-gaap_ShareBasedCompensation
Other (2)us-gaap_OtherNoncashIncomeExpense (2)us-gaap_OtherNoncashIncomeExpense
Change in operating assets and liabilities:    
Accounts receivable 120us-gaap_IncreaseDecreaseInAccountsReceivable (75)us-gaap_IncreaseDecreaseInAccountsReceivable
Derivative instruments, net (17)us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities (87)us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities
Other assets (28)us-gaap_IncreaseDecreaseInOtherOperatingAssets 29us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable and accrued expenses (204)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 106us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Other liabilities 15us-gaap_IncreaseDecreaseInOtherAccountsPayable (72)us-gaap_IncreaseDecreaseInOtherAccountsPayable
Net cash provided by (used in) operating activities (17)us-gaap_NetCashProvidedByUsedInOperatingActivities 123us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Purchases of property, plant and equipment (162)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (119)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchase of Guadalupe Energy Center, net of cash 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (656)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Decrease in restricted cash 35us-gaap_IncreaseDecreaseInRestrictedCash 6us-gaap_IncreaseDecreaseInRestrictedCash
Other (1)us-gaap_PaymentsForProceedsFromOtherInvestingActivities 0us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities (128)us-gaap_NetCashProvidedByUsedInInvestingActivities (769)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Borrowings under CCFC Term Loans 0us-gaap_ProceedsFromIssuanceOfSecuredDebt 420us-gaap_ProceedsFromIssuanceOfSecuredDebt
Repayment of CCFC Term Loans and First Lien Term Loans (11)us-gaap_RepaymentsOfSecuredDebt (11)us-gaap_RepaymentsOfSecuredDebt
Borrowings under Senior Unsecured Notes 650us-gaap_ProceedsFromIssuanceOfUnsecuredDebt 0us-gaap_ProceedsFromIssuanceOfUnsecuredDebt
Repurchase of First Lien Notes (147)us-gaap_RepaymentsOfSeniorDebt 0us-gaap_RepaymentsOfSeniorDebt
Repayments of project financing, notes payable and other (58)us-gaap_RepaymentsOfOtherLongTermDebt (43)us-gaap_RepaymentsOfOtherLongTermDebt
Financing costs (11)us-gaap_PaymentsOfFinancingCosts (10)us-gaap_PaymentsOfFinancingCosts
Stock repurchases (202)us-gaap_PaymentsForRepurchaseOfCommonStock (140)us-gaap_PaymentsForRepurchaseOfCommonStock
Proceeds from exercises of stock options 3us-gaap_ProceedsFromStockOptionsExercised 4us-gaap_ProceedsFromStockOptionsExercised
Net cash provided by financing activities 224us-gaap_NetCashProvidedByUsedInFinancingActivities 220us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase (decrease) in cash and cash equivalents 79us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (426)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 717us-gaap_CashAndCashEquivalentsAtCarryingValue 941us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 796us-gaap_CashAndCashEquivalentsAtCarryingValue 515us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid during the period for:    
Interest, net of amounts capitalized 146us-gaap_InterestPaidNet 225us-gaap_InterestPaidNet
Income taxes 6us-gaap_IncomeTaxesPaid 8us-gaap_IncomeTaxesPaid
Supplemental disclosure of non-cash investing activities:    
Change in capital expenditures included in accounts payable $ (22)us-gaap_CapitalExpendituresIncurredButNotYetPaid $ (9)us-gaap_CapitalExpendituresIncurredButNotYetPaid
[1] Includes depreciation and amortization included in fuel and purchased energy expense and interest expense on our Consolidated Condensed Statements of Operations
[2] In addition to changes in market value on derivatives not designated as hedges, changes in mark-to-market gain (loss) also includes de-designation of interest rate swap cash flow hedges and related reclassification from AOCI into earnings, hedge ineffectiveness and adjustments to reflect changes in credit default risk exposure.