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v2.4.1.9

Fair Value of FInancial Instruments Fair Value Unobservable Input Reconciliation (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Net realized and unrealized losses | $ 15 por_RealizedAndUnrealizedGainsAndLossesNetCommodityContract | $ 134 por_RealizedAndUnrealizedGainsAndLossesNetCommodityContract |
Settlements | (4)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements | (1)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements |
Net transfers out of Level 3 to Level 2 | (50)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3 | (10)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3 |
Net liabilities from price risk management activities as of end of year | 100 por_NetLiabilitiesFromPriceRiskManagementActivitiesClassifiedAsLevel3 | 139 por_NetLiabilitiesFromPriceRiskManagementActivitiesClassifiedAsLevel3 | 16 por_NetLiabilitiesFromPriceRiskManagementActivitiesClassifiedAsLevel3
Level 3 net unrealized losses that have been fully offset by the effect of regulatory accounting | 12 por_Level3RealizedAndUnrealizedLossesOffsetByEffectOfRegulatoryAccounting | 133 por_Level3RealizedAndUnrealizedLossesOffsetByEffectOfRegulatoryAccounting |
Net realized losses | $ 3 por_NetRealizedLosses | $ 1 por_NetRealizedLosses |

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- Definition Level 3 net realized and unrealized losses that have been offset by the effect of regulatory accounting. + References No definition available. + Details
Name: | por_Level3RealizedAndUnrealizedLossesOffsetByEffectOfRegulatoryAccounting
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Net Liabilities From Price Risk Management Activities Classified as Level 3 + References No definition available. + Details
Name: | por_NetLiabilitiesFromPriceRiskManagementActivitiesClassifiedAsLevel3
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition net realized losses on price risk management + References No definition available. + Details
Name: | por_NetRealizedLosses
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Realized and Unrealized Gains and Losses, Net, Commodity Contracts + References No definition available. + Details
Name: | por_RealizedAndUnrealizedGainsAndLossesNetCommodityContract
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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Balance Type: | credit
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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Data Type: | xbrli:monetaryItemType
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