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Basis of Presentation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
sqmi
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Basis of Presentation [Abstract]            
Incorporated Cities 52por_IncorporatedCities          
Service Area Sq Miles 4,000por_ServiceAreaSqMiles          
Number of Retail Customers 842,273por_NumberOfRetailCustomers          
Service area population 1,800,000por_ServiceAreaPopulation          
Percent of State's Population 46.00%por_PercentOfStatesPopulation          
Entity Number of Employees 2,600dei_EntityNumberOfEmployees          
Number of Union Employees 780por_NumberOfUnionEmployees          
Number of Union Employees Subject to Agreement A 743por_NumberOfUnionEmployeesSubjectToAgreementA          
Number of Union Employees Subject to Agreement B 37por_NumberOfUnionEmployeesSubjectToAgreementB          
revenue overstatment   $ 9por_Revenueoverstatment $ 3por_Revenueoverstatment $ 3por_Revenueoverstatment $ 2por_Revenueoverstatment $ 1por_Revenueoverstatment
Margin Deposit Assets 11us-gaap_MarginDepositAssets 9us-gaap_MarginDepositAssets        
Renewable adjustment clause deferrals     1por_RenewableAdjustmentClauseDeferrals      
Cash Received from BPA $ 13por_CashReceivedfromBPA $ 1por_CashReceivedfromBPA $ 0por_CashReceivedfromBPA