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Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Asset Retirement Obligation Disclosure [Abstract] |  |  |  |  |  |  |
Damages sought in USDOE claim |  |  |  |  | $ 112 por_DamagesSoughtInUsdoeClaim |  |
Asset Retirement Obligation Rate Recovery related to Trojan Plant |  |  |  |  | 4 por_AssetRetirementObligationRateRecoveryRelatedToTrojanPlant |  |
Loss Contingency, Damages Awarded, Value |  |  | 70 us-gaap_LossContingencyDamagesAwardedValue |  | 9 us-gaap_LossContingencyDamagesAwardedValue |  |
Proceeds from Legal Settlements |  |  |  | 50 us-gaap_ProceedsFromLegalSettlements | 6 us-gaap_ProceedsFromLegalSettlements | 44 us-gaap_ProceedsFromLegalSettlements | 0 us-gaap_ProceedsFromLegalSettlements
Asset Retirement Obligation, Liabilities Incurred | $ 7 us-gaap_AssetRetirementObligationLiabilitiesIncurred | $ 8 us-gaap_AssetRetirementObligationLiabilitiesIncurred |  |  | $ 15 us-gaap_AssetRetirementObligationLiabilitiesIncurred | $ 4 us-gaap_AssetRetirementObligationLiabilitiesIncurred | $ 0 us-gaap_AssetRetirementObligationLiabilitiesIncurred

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- Definition Asset Retirement Obligation Rate Recovery related to Trojan Plant + References No definition available. + Details
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- Definition Damages sought in USDOE claim + References No definition available. + Details
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- Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of damages awarded to the plaintiff 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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- Definition Cash received for the settlement of litigation during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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