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Property, Plant and Equipment, Net Property, Plant and Equipment, Net (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Property, plant and equipment in-service $ 25,813pcorp_ElectricPropertyPlantAndEquipmentInServiceGross $ 24,868pcorp_ElectricPropertyPlantAndEquipmentInServiceGross  
Accumulated depreciation and amortization (8,026)pcorp_PublicUtilityAccumulatedDepreciationAndAmortization (7,686)pcorp_PublicUtilityAccumulatedDepreciationAndAmortization  
Net property, plant and equipment in-service 17,787pcorp_PublicUtilitiesPropertyPlantAndEquipmentInServiceNet 17,182pcorp_PublicUtilitiesPropertyPlantAndEquipmentInServiceNet  
Construction work-in-progress 932us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress 1,325us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress  
Total property, plant and equipment, net 18,719us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet 18,507us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet  
Average depreciation and amortization rate 3.00%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService 2.80%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService 2.80%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
Property, plant and equipment unallocated acquisition adjustments 143us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1 159us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1  
Accumulated depreciation for unallocated acquisition adjustments 107us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustmentsRelatedAccumulatedDepreciation1 118us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustmentsRelatedAccumulatedDepreciation1  
Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Depreciable Life, Generation 10 years    
Depreciable Life, Transmission 58 years    
Depreciable Life, Distribution 20 years    
Depreciable Life, Intangible plant 5 years [1]    
Depreciable Life, Other 5 years    
Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Depreciable Life, Generation 67 years    
Depreciable Life, Transmission 75 years    
Depreciable Life, Distribution 70 years    
Depreciable Life, Intangible plant 65 years [1]    
Depreciable Life, Other 60 years    
Generation [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment in-service 11,932pcorp_ElectricPropertyPlantAndEquipmentInServiceGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricityGenerationPlantNonNuclearMember		 11,058pcorp_ElectricPropertyPlantAndEquipmentInServiceGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricityGenerationPlantNonNuclearMember		  
Transmission [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment in-service 5,392pcorp_ElectricPropertyPlantAndEquipmentInServiceGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember		 5,235pcorp_ElectricPropertyPlantAndEquipmentInServiceGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember		  
Distribution [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment in-service 6,197pcorp_ElectricPropertyPlantAndEquipmentInServiceGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricDistributionMember		 6,030pcorp_ElectricPropertyPlantAndEquipmentInServiceGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricDistributionMember		  
Intangible plant [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment in-service 879pcorp_ElectricPropertyPlantAndEquipmentInServiceGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherIntangibleAssetsMember		 [1] 857pcorp_ElectricPropertyPlantAndEquipmentInServiceGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherIntangibleAssetsMember		 [1]  
Other [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment in-service 1,413pcorp_ElectricPropertyPlantAndEquipmentInServiceGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember		 1,688pcorp_ElectricPropertyPlantAndEquipmentInServiceGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember		  
Computer software [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Depreciable Life, Intangible plant 5 years    
Computer software [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Depreciable Life, Intangible plant 10 years    
Service Life [Member]      
Property, Plant and Equipment [Line Items]      
Change in Accounting Estimates, Impact on Period of Change $ 35pcorp_ChangeInAccountingEstimatesImpactOnPeriodOfChange
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ServiceLifeMember		    
[1] Computer software costs included in intangible plant are initially assigned a depreciable life of 5 to 10 years.