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Derivative Instruments (Textuals) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Derivatives, Fair Value [Line Items] | |||
| Maximum length of time hedging using interest rate derivative instruments | 9 years | ||
| Derivative, Net Liability Position, Aggregate Fair Value | $ 19us-gaap_DerivativeNetLiabilityPositionAggregateFairValue | ||
| Collateral Already Posted, Aggregate Fair Value | 11us-gaap_CollateralAlreadyPostedAggregateFairValue | ||
| Additional Collateral, Aggregate Fair Value | 5us-gaap_AdditionalCollateralAggregateFairValue | ||
| Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax | 0us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax | 3us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax | 11us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax |
| Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net | 0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet | 0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet | (2)us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet |
| (Gain) Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net | 10us-gaap_GainLossOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurringNet | 12us-gaap_GainLossOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurringNet | |
| Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | (46)us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths | ||
| Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments | 0us-gaap_GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments | 0us-gaap_GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments | (14)us-gaap_GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments |
| Gain Loss On Interest Rate Derivative Instruments Not Designated As Hedging Instruments, Unrealized | 14cpn_GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsUnrealized | ||
| Gain Loss On Interest Rate Derivative Instruments Not Designated As Hedging Instruments, Realized | 142cpn_GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsRealized | ||
| Interest Rate Swap [Member] | |||
| Derivatives, Fair Value [Line Items] | |||
| Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments | 156us-gaap_GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestRateSwapMember |
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| Parent [Member] | |||
| Derivatives, Fair Value [Line Items] | |||
| Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | (149)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |
(148)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |
(222)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |
| Noncontrolling Interest [Member] | |||
| Derivatives, Fair Value [Line Items] | |||
| Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | $ (12)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
$ (11)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
$ (20)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
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- Definition
GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsRealized No definition available.
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- Definition
Gain Loss On Interest Rate Derivative Instruments Not Designated As Hedging Instruments, Unrealized No definition available.
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- Definition
Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of net gain (loss) reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated as hedging instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Maximum period the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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