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Commitments and Contingencies Commitments and Contingencies - Commitments Table (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Contractual Obligation [Line Items]      
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 5us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
Operating Leases, Future Minimum Payments, Due in Two Years 5us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
Operating Leases, Future Minimum Payments, Due in Three Years 4us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
Operating Leases, Future Minimum Payments, Due in Four Years 4us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
Operating Leases, Future Minimum Payments, Due in Five Years 4us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Operating Leases, Future Minimum Payments, Due Thereafter 46us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Operating Leases, Future Minimum Payments Due 68us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Contractual Obligation, Due in Next Twelve Months 1,360us-gaap_ContractualObligationDueInNextTwelveMonths    
Contractual Obligation, Due in Second Year 958us-gaap_ContractualObligationDueInSecondYear    
Contractual Obligation, Due in Third Year 861us-gaap_ContractualObligationDueInThirdYear    
Contractual Obligation, Due in Fourth Year 699us-gaap_ContractualObligationDueInFourthYear    
Contractual Obligation, Due in Fifth Year 686us-gaap_ContractualObligationDueInFifthYear    
Contractual Obligation, Due after Fifth Year 3,416us-gaap_ContractualObligationDueAfterFifthYear    
Contractual Obligation 7,980us-gaap_ContractualObligation    
Rent expense for power purchase agreements meeting definition of a lease 15pcorp_RentExpenseForPowerPurchaseAgreementsMeetingDefinitionOfOperatingLease 24pcorp_RentExpenseForPowerPurchaseAgreementsMeetingDefinitionOfOperatingLease 19pcorp_RentExpenseForPowerPurchaseAgreementsMeetingDefinitionOfOperatingLease
Maximum percentage of energy sources for which a share of operating costs and debt service is required 5.00%pcorp_MaximumPercentageOfEnergySourcesForWhichShareOfOperatingCostsAndDebtServiceIsRequired 5.00%pcorp_MaximumPercentageOfEnergySourcesForWhichShareOfOperatingCostsAndDebtServiceIsRequired 5.00%pcorp_MaximumPercentageOfEnergySourcesForWhichShareOfOperatingCostsAndDebtServiceIsRequired
Rent expense 16us-gaap_OperatingLeasesRentExpenseNet 16us-gaap_OperatingLeasesRentExpenseNet 14us-gaap_OperatingLeasesRentExpenseNet
Purchased electricity contracts - commercially operable [Member]      
Contractual Obligation [Line Items]      
Purchase Obligation, Due in Next Twelve Months 167us-gaap_PurchaseObligationDueInNextTwelveMonths
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_PurchasedElectricityContractsWithCommerciallyOperableFacilitiesMember
   
Purchase Obligation, Due in Second Year 90us-gaap_PurchaseObligationDueInSecondYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_PurchasedElectricityContractsWithCommerciallyOperableFacilitiesMember
   
Purchase Obligation, Due in Third Year 65us-gaap_PurchaseObligationDueInThirdYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_PurchasedElectricityContractsWithCommerciallyOperableFacilitiesMember
   
Purchase Obligation, Due in Fourth Year 61us-gaap_PurchaseObligationDueInFourthYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_PurchasedElectricityContractsWithCommerciallyOperableFacilitiesMember
   
Purchase Obligation, Due in Fifth Year 58us-gaap_PurchaseObligationDueInFifthYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_PurchasedElectricityContractsWithCommerciallyOperableFacilitiesMember
   
Purchase Obligation, Due after Fifth Year 292us-gaap_PurchaseObligationDueAfterFifthYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_PurchasedElectricityContractsWithCommerciallyOperableFacilitiesMember
   
Purchase Obligation 733us-gaap_PurchaseObligation
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_PurchasedElectricityContractsWithCommerciallyOperableFacilitiesMember
   
Purchased electricity contracts - non-commercially operable [Member]      
Contractual Obligation [Line Items]      
Purchase Obligation, Due in Next Twelve Months 3us-gaap_PurchaseObligationDueInNextTwelveMonths
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_PurchasedElectricityContractsWithNonCommerciallyOperableFacilitiesMember
   
Purchase Obligation, Due in Second Year 16us-gaap_PurchaseObligationDueInSecondYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_PurchasedElectricityContractsWithNonCommerciallyOperableFacilitiesMember
   
Purchase Obligation, Due in Third Year 64us-gaap_PurchaseObligationDueInThirdYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_PurchasedElectricityContractsWithNonCommerciallyOperableFacilitiesMember
   
Purchase Obligation, Due in Fourth Year 65us-gaap_PurchaseObligationDueInFourthYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_PurchasedElectricityContractsWithNonCommerciallyOperableFacilitiesMember
   
Purchase Obligation, Due in Fifth Year 65us-gaap_PurchaseObligationDueInFifthYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_PurchasedElectricityContractsWithNonCommerciallyOperableFacilitiesMember
   
Purchase Obligation, Due after Fifth Year 1,078us-gaap_PurchaseObligationDueAfterFifthYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_PurchasedElectricityContractsWithNonCommerciallyOperableFacilitiesMember
   
Purchase Obligation 1,291us-gaap_PurchaseObligation
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_PurchasedElectricityContractsWithNonCommerciallyOperableFacilitiesMember
   
Fuel contracts [Member]      
Contractual Obligation [Line Items]      
Purchase Obligation, Due in Next Twelve Months 789us-gaap_PurchaseObligationDueInNextTwelveMonths
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_PublicUtilitiesInventoryFuelMember
   
Purchase Obligation, Due in Second Year 653us-gaap_PurchaseObligationDueInSecondYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_PublicUtilitiesInventoryFuelMember
   
Purchase Obligation, Due in Third Year 588us-gaap_PurchaseObligationDueInThirdYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_PublicUtilitiesInventoryFuelMember
   
Purchase Obligation, Due in Fourth Year 452us-gaap_PurchaseObligationDueInFourthYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_PublicUtilitiesInventoryFuelMember
   
Purchase Obligation, Due in Fifth Year 460us-gaap_PurchaseObligationDueInFifthYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_PublicUtilitiesInventoryFuelMember
   
Purchase Obligation, Due after Fifth Year 1,294us-gaap_PurchaseObligationDueAfterFifthYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_PublicUtilitiesInventoryFuelMember
   
Purchase Obligation 4,236us-gaap_PurchaseObligation
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_PublicUtilitiesInventoryFuelMember
   
Construction commitments [Member]      
Contractual Obligation [Line Items]      
Purchase Obligation, Due in Next Twelve Months 231us-gaap_PurchaseObligationDueInNextTwelveMonths
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_CapitalAdditionsMember
   
Purchase Obligation, Due in Second Year 53us-gaap_PurchaseObligationDueInSecondYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_CapitalAdditionsMember
   
Purchase Obligation, Due in Third Year 12us-gaap_PurchaseObligationDueInThirdYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_CapitalAdditionsMember
   
Purchase Obligation, Due in Fourth Year 8us-gaap_PurchaseObligationDueInFourthYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_CapitalAdditionsMember
   
Purchase Obligation, Due in Fifth Year 2us-gaap_PurchaseObligationDueInFifthYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_CapitalAdditionsMember
   
Purchase Obligation, Due after Fifth Year 8us-gaap_PurchaseObligationDueAfterFifthYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_CapitalAdditionsMember
   
Purchase Obligation 314us-gaap_PurchaseObligation
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_CapitalAdditionsMember
   
Transmission [Member]      
Contractual Obligation [Line Items]      
Purchase Obligation, Due in Next Twelve Months 116us-gaap_PurchaseObligationDueInNextTwelveMonths
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_TransmissionMember
   
Purchase Obligation, Due in Second Year 112us-gaap_PurchaseObligationDueInSecondYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_TransmissionMember
   
Purchase Obligation, Due in Third Year 102us-gaap_PurchaseObligationDueInThirdYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_TransmissionMember
   
Purchase Obligation, Due in Fourth Year 95us-gaap_PurchaseObligationDueInFourthYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_TransmissionMember
   
Purchase Obligation, Due in Fifth Year 78us-gaap_PurchaseObligationDueInFifthYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_TransmissionMember
   
Purchase Obligation, Due after Fifth Year 617us-gaap_PurchaseObligationDueAfterFifthYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_TransmissionMember
   
Purchase Obligation 1,120us-gaap_PurchaseObligation
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_TransmissionMember
   
Maintenance, service and other contracts [Member]      
Contractual Obligation [Line Items]      
Purchase Obligation, Due in Next Twelve Months 49us-gaap_PurchaseObligationDueInNextTwelveMonths
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_MaintenanceServiceAndOtherContractsMember
   
Purchase Obligation, Due in Second Year 29us-gaap_PurchaseObligationDueInSecondYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_MaintenanceServiceAndOtherContractsMember
   
Purchase Obligation, Due in Third Year 26us-gaap_PurchaseObligationDueInThirdYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_MaintenanceServiceAndOtherContractsMember
   
Purchase Obligation, Due in Fourth Year 14us-gaap_PurchaseObligationDueInFourthYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_MaintenanceServiceAndOtherContractsMember
   
Purchase Obligation, Due in Fifth Year 19us-gaap_PurchaseObligationDueInFifthYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_MaintenanceServiceAndOtherContractsMember
   
Purchase Obligation, Due after Fifth Year 81us-gaap_PurchaseObligationDueAfterFifthYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_MaintenanceServiceAndOtherContractsMember
   
Purchase Obligation $ 218us-gaap_PurchaseObligation
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pcorp_MaintenanceServiceAndOtherContractsMember