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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 | 52 por_IncorporatedCities |  |  |  |  |
Service Area Sq Miles | 4,000 por_ServiceAreaSqMiles |  |  |  |  |
Number of Retail Customers | 842,273 por_NumberOfRetailCustomers |  |  |  |  |
Service area population | 1,800,000 por_ServiceAreaPopulation |  |  |  |  |
Percent of State's Population | 46.00%por_PercentOfStatesPopulation |  |  |  |  |
Entity Number of Employees | 2,600 dei_EntityNumberOfEmployees |  |  |  |  |
Number of Union Employees | 780 por_NumberOfUnionEmployees |  |  |  |  |
Number of Union Employees Subject to Agreement A | 743 por_NumberOfUnionEmployeesSubjectToAgreementA |  |  |  |  |
Number of Union Employees Subject to Agreement B | 37 por_NumberOfUnionEmployeesSubjectToAgreementB |  |  |  |  |
revenue overstatment |  | $ 9 por_Revenueoverstatment | $ 3 por_Revenueoverstatment | $ 3 por_Revenueoverstatment | $ 2 por_Revenueoverstatment | $ 1 por_Revenueoverstatment
Margin Deposit Assets | 11 us-gaap_MarginDepositAssets | 9 us-gaap_MarginDepositAssets |  |  |  |
Renewable adjustment clause deferrals |  |  | 1 por_RenewableAdjustmentClauseDeferrals |  |  |
Cash Received from BPA | $ 13 por_CashReceivedfromBPA | $ 1 por_CashReceivedfromBPA | $ 0 por_CashReceivedfromBPA |  |  |

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- Definition Number of persons employed by the Entity + References No definition available. + Details
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- Details
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- Definition Cash Received from BPA to be provided to customers. + References No definition available. + Details
Name: | por_CashReceivedfromBPA
Namespace Prefix: | por_
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Balance Type: | debit
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- Definition Number of incorporated cities in service area. + References No definition available. + Details
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Balance Type: | na
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- Definition Includes residential, commercial and industrial. + References No definition available. + Details
Name: | por_NumberOfRetailCustomers
Namespace Prefix: | por_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of employees subject to collective bargaining agreements. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of employees subject to collective bargaining agreement A. + References No definition available. + Details
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Namespace Prefix: | por_
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Balance Type: | na
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- Definition Number of employees subject to collective bargaining agreement B. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Service area population as a percent of the state's population. + References No definition available. + Details
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Balance Type: | na
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- Definition The deferral under the Company's Renewable Adjustment Clause mechanism of the amounts recorded in net income related to the Company's renewable energy projects that are expected to be recovered, or refunded, in future periods. + References No definition available. + Details
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Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Adjustment to revenue to reduce total for the overstatment of a prior customer billing. + References No definition available. + Details
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Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Service Area Population + References No definition available. + Details
Name: | por_ServiceAreaPopulation
Namespace Prefix: | por_
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- Definition Approximate square miles of service area. + References No definition available. + Details
Name: | por_ServiceAreaSqMiles
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Balance Type: | na
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- Definition The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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