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Price Risk Management (Policies) | 12 Months Ended
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Dec. 31, 2012
Price Risk Management [Abstract] |
Gross Reporting of Positive and Negative Exposures Related to Derivative Instruments [Policy Text Block] | PGE has elected to report gross on the consolidated balance sheets the positive and negative exposures resulting from derivative instruments entered into with counterparties where a master netting arrangement exists.

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- Definition The company elects to report gross on the balance sheet the positive and negative exposures resultinig from derivative instruments. + References No definition available. + Details
Name: | por_GrossReportingOfPositiveAndNegativeExposuresRelatedToDerivativeInstrumentsPolicyTextBlock
Namespace Prefix: | por_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | por_PriceRiskManagementAbstract
Namespace Prefix: | por_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration