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Regulatory Assets and Liabilities Schedule of Regulatory Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Regulatory Assets [Line Items] |  |
Remaining Recovery Period of Regulatory Assets, Price Risk Management | 3 years |
Remaining Recovery Period of Regulatory Asset, Debt Reacquisition Costs | 8 years |
Price risk management | $ 6 por_RegulatoryAssetsFromPriceRiskManagementActivities | $ 13 por_RegulatoryAssetsFromPriceRiskManagementActivities
Deferred income taxes | 48 us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities | 33 us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities
remaining recovery period of regulatory assets, deferred capital projects | 1 year |
Remaining refund period of regulatory liability, Trojan decommissioning activities | 2 years |
Current Regulatory Liabilities [Member] |  |
Regulatory Assets [Line Items] |  |
Asset retirement removal costs | 0 por_AssetRetirementRemovalCost / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember | 0 por_AssetRetirementRemovalCost / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember
Proceeds from Legal Settlements | 23 por_Regulatoryliabilitiestrojandecommissioningtrust / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember | 0 por_Regulatoryliabilitiestrojandecommissioningtrust / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember
Asset retirement obligations | 0 us-gaap_AssetRetirementObligationsNoncurrent / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember | 0 us-gaap_AssetRetirementObligationsNoncurrent / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember
Other | 37 por_RegulatoryLiabilitiesOther / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember | 1 por_RegulatoryLiabilitiesOther / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember
Total regulatory liabilities | 60 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember | 1 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember
Noncurrent Regulatory Liabilities [Member] |  |
Regulatory Assets [Line Items] |  |
Asset retirement removal costs | 804 por_AssetRetirementRemovalCost / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember | 747 por_AssetRetirementRemovalCost / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember
Proceeds from Legal Settlements | 34 por_Regulatoryliabilitiestrojandecommissioningtrust / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember | 49 por_Regulatoryliabilitiestrojandecommissioningtrust / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember
Asset retirement obligations | 39 us-gaap_AssetRetirementObligationsNoncurrent / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember | 39 us-gaap_AssetRetirementObligationsNoncurrent / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember
Other | 29 por_RegulatoryLiabilitiesOther / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember | 30 por_RegulatoryLiabilitiesOther / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember
Total regulatory liabilities | 906 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember | 865 us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember
Regulatory Assets, Current [Member] |  |
Regulatory Assets [Line Items] |  |
Price risk management | 100 por_RegulatoryAssetsFromPriceRiskManagementActivities / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember | 36 por_RegulatoryAssetsFromPriceRiskManagementActivities / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember
Pension and other postretirement plans | 0 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember | 0 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember
Deferred income taxes | 0 us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember | 0 us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember
Debt reacquisition costs | 0 us-gaap_DeferredFinanceCostsNet / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember | 0 us-gaap_DeferredFinanceCostsNet / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember
Deferred capital project | 19 por_DeferredCapitalProject / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember | 16 por_DeferredCapitalProject / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember
Other | 14 us-gaap_OtherDeferredCostsNet / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember | 14 us-gaap_OtherDeferredCostsNet / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember
Total regulatory assets | 133 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember | 66 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember
Noncurrent Regulatory Assets [Member] |  |
Regulatory Assets [Line Items] |  |
Price risk management | 121 por_RegulatoryAssetsFromPriceRiskManagementActivities / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember | 140 por_RegulatoryAssetsFromPriceRiskManagementActivities / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember
Pension and other postretirement plans | 247 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember | 194 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember
Deferred income taxes | 86 us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember | 76 us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember
Debt reacquisition costs | 15 us-gaap_DeferredFinanceCostsNet / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember | 17 us-gaap_DeferredFinanceCostsNet / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember
Deferred capital project | 0 por_DeferredCapitalProject / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember | 18 por_DeferredCapitalProject / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember
Other | 25 us-gaap_OtherDeferredCostsNet / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember | 19 us-gaap_OtherDeferredCostsNet / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember
Total regulatory assets | $ 494 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember | $ 464 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember

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- Definition Asset retirement removal costs. + References No definition available. + Details
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- Definition Deferred capital project. + References No definition available. + Details
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- Definition Regulatory assets from price risk management activities + References No definition available. + Details
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- Definition Other regulatory liabilities. + References No definition available. + Details
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- Definition regulatory liabilities - Amounts held in trojan decommissioning trust that is to be returned to customers in future rate proceedings. + References No definition available. + Details
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- Definition Remaining Recovery Period of Regulatory Asset, Debt Issuance Costs + References No definition available. + Details
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- Definition remaining recovery period of regulatory assets, deferred capital projects + References No definition available. + Details
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- Definition Remaining recovery period of regulatory assets, Price Risk Management, for which no return on investment during recovery period is provided. + References No definition available. + Details
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- Definition Remaining refund period of regulatory liability, Trojan decommissioning activities + References No definition available. + Details
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- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + 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) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences derived regulatory assets and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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- Definition Net amount of other deferred costs capitalized at the end of the reporting period. Does not include deferred finance costs or deferred acquisition costs of insurance companies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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- Details
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- Details
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