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Commitments and Contingencies Commitments and Contingencies - Hydroelectric Relicensing (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dam removal costs [Line Items]    
Assets $ 22,267us-gaap_Assets $ 21,659us-gaap_Assets
Klamath Hydroelectric System [Member]    
Dam removal costs [Line Items]    
Dam removal cost limit 200pcorp_DamRemovalCostLimit
/ pcorp_HydroelectricSystemNameAxis
= pcorp_KlamathHydroelectricSystemMember		  
Additional dam removal costs, California bond measure 250pcorp_AdditionalDamRemovalCostsCaliforniaBondMeasure
/ pcorp_HydroelectricSystemNameAxis
= pcorp_KlamathHydroelectricSystemMember		  
Assets 92us-gaap_Assets
/ pcorp_HydroelectricSystemNameAxis
= pcorp_KlamathHydroelectricSystemMember		  
OREGON | Klamath Hydroelectric System [Member]    
Dam removal costs [Line Items]    
Dam removal cost limit 184pcorp_DamRemovalCostLimit
/ pcorp_CostRecoveredFromCustomersByStateAxis
= stpr_OR
/ pcorp_HydroelectricSystemNameAxis
= pcorp_KlamathHydroelectricSystemMember		  
CALIFORNIA | Klamath Hydroelectric System [Member]    
Dam removal costs [Line Items]    
Dam removal cost limit $ 16pcorp_DamRemovalCostLimit
/ pcorp_CostRecoveredFromCustomersByStateAxis
= stpr_CA
/ pcorp_HydroelectricSystemNameAxis
= pcorp_KlamathHydroelectricSystemMember