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Fair Value of FInancial Instruments Fair Value Unobservable Input Reconciliation (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net realized and unrealized losses $ 15por_RealizedAndUnrealizedGainsAndLossesNetCommodityContract $ 134por_RealizedAndUnrealizedGainsAndLossesNetCommodityContract  
Settlements (4)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements (1)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements  
Net transfers out of Level 3 to Level 2 (50)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3 (10)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3  
Net liabilities from price risk management activities as of end of year 100por_NetLiabilitiesFromPriceRiskManagementActivitiesClassifiedAsLevel3 139por_NetLiabilitiesFromPriceRiskManagementActivitiesClassifiedAsLevel3 16por_NetLiabilitiesFromPriceRiskManagementActivitiesClassifiedAsLevel3
Level 3 net unrealized losses that have been fully offset by the effect of regulatory accounting 12por_Level3RealizedAndUnrealizedLossesOffsetByEffectOfRegulatoryAccounting 133por_Level3RealizedAndUnrealizedLossesOffsetByEffectOfRegulatoryAccounting  
Net realized losses $ 3por_NetRealizedLosses $ 1por_NetRealizedLosses