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Contingencies (Details) (USD $) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 claims | Jun. 30, 2013 claims | Dec. 31, 1997 | Sep. 30, 2008 | Dec. 31, 1993
Loss Contingencies [Line Items] |  |  |  |  |
Investment in Trojan |  |  |  |  | 87.00%por_InvestmentInTrojan
Refund to customers for Trojan Investment including interest |  |  |  | $ 33,000,000 por_RefundToCustomersForTrojanInvestmentIncludingInterest |
Class action damages sought | 260,000,000 por_ClassActionLawsuitDamagesSought |  |  |  |
Loss Contingency, Claims Settled, Number | 2 us-gaap_LossContingencyClaimsSettledNumber |  |  |  |
Contracts | 119 por_Contracts |  |  |  |
Site Contingency, Names of Other Potentially Responsible Parties | 100 |  | 69 |  |
Lower 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 |  |  |  |
Remediation cost estimate lower range | 3,000,000 us-gaap_LossContingencyRangeOfPossibleLossMinimum |  |  |  |
Remediation cost estimate upper range | 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 |  |  |  |
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 |  |  |  |
Loss Contingency, Actions Taken by Defendant |  | 36 |  |  |
projects added to plaintiff's suit | 2 por_Projectsaddedtoplaintiffssuit |  |  |  |
Loss Contingency, Pending Claims, Number | 40 us-gaap_LossContingencyPendingClaimsNumber | 39 us-gaap_LossContingencyPendingClaimsNumber |  |  |

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 Class action lawsuit damages sought by plaintiffs against the Company. + 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 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 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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- Definition Describe actions taken by the defendant in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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