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Contingencies (Details) (USD $) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 claims | Dec. 31, 2012 claims | Dec. 31, 1997 | Dec. 31, 2013 | Jun. 30, 2013 claims | Sep. 30, 2008 | Sep. 30, 2000 | Dec. 31, 1993
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Investment in Trojan |  |  |  |  |  |  |  | 87.00%por_InvestmentInTrojan
Regulatory asset related to Trojan |  |  |  |  |  |  | $ 5,000,000 por_RegulatoryAssetRelatedToTrojan |
Refund to customers for Trojan Investment including interest |  |  |  |  |  | 33,100,000 por_RefundToCustomersForTrojanInvestmentIncludingInterest |  |
Class action damages sought | 260,000,000 por_ClassActionDamagesSought |  |  |  |  |  |  |
Loss Contingency, Claims Settled, Number |  | 2 us-gaap_LossContingencyClaimsSettledNumber |  |  |  |  |  |
contracts | 119 por_Contracts |  |  |  |  |  |  |
Site Contingency, Names of Other Potentially Responsible Parties | 100 |  | 69 |  |  |  |  |
Low estimate of range of cost of Portland Harbor cleanup in total | 169,000,000 por_LowEstimateOfRangeOfCostOfPortlandHarborCleanupInTotal |  |  |  |  |  |  |
Upper estimated range of total cost of Portland harbor cleanup | 1,800,000,000 por_UpperEstimatedRangeOfTotalCostOfPortlandHarborCleanup |  |  |  |  |  |  |
Loss Contingency, Range of Possible Loss, Minimum | 3,000,000 us-gaap_LossContingencyRangeOfPossibleLossMinimum |  |  |  |  |  |  |
Loss Contingency, Range of Possible Loss, Maximum | 8,000,000 us-gaap_LossContingencyRangeOfPossibleLossMaximum |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  | 3,000,000 us-gaap_LossContingencyEstimateOfPossibleLoss |  |  |  |
regulatory asset for recovery of loss contingencies | 3,000,000 por_Regulatoryassetforrecoveryoflosscontingencies |  |  |  |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share of Colstrip | 20.00%por_JointlyOwnedUtilityPlantProportionateOwnershipShareOfColstrip |  |  |  |  |  |  |
Potential Income Tax Liability related to State Tax Court Ruling | 7,000,000 por_PotentialIncomeTaxLiability |  |  |  |  |  |  |
Civil Penalty Claim - Per day per violation through January 12, 2009 | 32,500 por_CivilPenaltyClaimPerDayPerViolationThroughJanuary122009 |  |  |  |  |  |  |
Civil Penalty Claim - Per day per violation after January 12, 2009 | $ 37,500 por_CivilPenaltyClaimPerDayPerViolationAfterJanuary122009 |  |  |  |  |  |  |
Claims moved to dismiss |  |  |  |  | 36 por_Claimsmovedtodismiss |  |  |
Loss Contingency, Pending Claims, Number |  |  |  |  | 39 us-gaap_LossContingencyPendingClaimsNumber |  |  |
projects added to plaintiff's suit | 2 por_Projectsaddedtoplaintiffssuit |  |  |  |  |  |  |
projects encompassed by suit | 40 por_Projectsencompassedbysuit |  |  |  |  |  |  |

X
- Definition Civil Penalty Claim - Per day per violation after January 12, 2009 + References No definition available. + Details
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- Definition Civil Penalty Claim - Per Day Per Violation through January 12, 2009 + References No definition available. + Details
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- Definition Number of claims moved to dismiss in this matter. + References No definition available. + Details
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- Definition Class action damages sought by plaintiffs against the Company in regard to return on its investment in Trojan. + References No definition available. + Details
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- Definition Contracts that defendant in California proceeding had that are subject to possible refund. + References No definition available. + Details
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- Definition The portion of the Company's remaining investment in its Trojan plant that the OPUC allowed the Company to recover. + References No definition available. + Details
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- Definition The proportionate share of the reporting entity's interest (percent) in Colstrip, a jointly owned utility plant. + References No definition available. + Details
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- Definition Lower end estimate of the range of cost of Portland Harbor cleanup, in total. This represents the cost to all parties, not PGE portion. + References No definition available. + Details
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- Definition projects added to plaintiff's suit + References No definition available. + Details
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- Definition refund to customers for Trojan Investment including interest + References No definition available. + Details
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- Definition Upper estimated range of total cost of Portland harbor cleanup. This is the estimated cost for all parties, not PGE portion. + References No definition available. + Details
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- Details
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