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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	$ 6por_RegulatoryAssetsFromPriceRiskManagementActivities	$ 13por_RegulatoryAssetsFromPriceRiskManagementActivities
Deferred income taxes	48us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities	33us-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	0por_AssetRetirementRemovalCost / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember	0por_AssetRetirementRemovalCost / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember
Proceeds from Legal Settlements	23por_Regulatoryliabilitiestrojandecommissioningtrust / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember	0por_Regulatoryliabilitiestrojandecommissioningtrust / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember
Asset retirement obligations	0us-gaap_AssetRetirementObligationsNoncurrent / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember	0us-gaap_AssetRetirementObligationsNoncurrent / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember
Other	37por_RegulatoryLiabilitiesOther / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember	1por_RegulatoryLiabilitiesOther / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember
Total regulatory liabilities	60us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember	1us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = por_CurrentRegulatoryLiabilitiesMember
Noncurrent Regulatory Liabilities [Member]
Regulatory Assets [Line Items]
Asset retirement removal costs	804por_AssetRetirementRemovalCost / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember	747por_AssetRetirementRemovalCost / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember
Proceeds from Legal Settlements	34por_Regulatoryliabilitiestrojandecommissioningtrust / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember	49por_Regulatoryliabilitiestrojandecommissioningtrust / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember
Asset retirement obligations	39us-gaap_AssetRetirementObligationsNoncurrent / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember	39us-gaap_AssetRetirementObligationsNoncurrent / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember
Other	29por_RegulatoryLiabilitiesOther / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember	30por_RegulatoryLiabilitiesOther / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember
Total regulatory liabilities	906us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember	865us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = por_NoncurrentRegulatoryLiabilitiesMember
Regulatory Assets, Current [Member]
Regulatory Assets [Line Items]
Price risk management	100por_RegulatoryAssetsFromPriceRiskManagementActivities / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember	36por_RegulatoryAssetsFromPriceRiskManagementActivities / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember
Pension and other postretirement plans	0us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember	0us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember
Deferred income taxes	0us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember	0us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember
Debt reacquisition costs	0us-gaap_DeferredFinanceCostsNet / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember	0us-gaap_DeferredFinanceCostsNet / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember
Deferred capital project	19por_DeferredCapitalProject / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember	16por_DeferredCapitalProject / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember
Other	14us-gaap_OtherDeferredCostsNet / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember	14us-gaap_OtherDeferredCostsNet / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember
Total regulatory assets	133us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember	66us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = por_RegulatoryAssetsCurrentMember
Noncurrent Regulatory Assets [Member]
Regulatory Assets [Line Items]
Price risk management	121por_RegulatoryAssetsFromPriceRiskManagementActivities / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember	140por_RegulatoryAssetsFromPriceRiskManagementActivities / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember
Pension and other postretirement plans	247us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember	194us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember
Deferred income taxes	86us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember	76us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember
Debt reacquisition costs	15us-gaap_DeferredFinanceCostsNet / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember	17us-gaap_DeferredFinanceCostsNet / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember
Deferred capital project	0por_DeferredCapitalProject / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember	18por_DeferredCapitalProject / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember
Other	25us-gaap_OtherDeferredCostsNet / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember	19us-gaap_OtherDeferredCostsNet / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember
Total regulatory assets	$ 494us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember	$ 464us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = por_NoncurrentRegulatoryAssetsMember

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Asset retirement removal costs.

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Deferred capital project.

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Regulatory assets from price risk management activities

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Other regulatory liabilities.

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regulatory liabilities - Amounts held in trojan decommissioning trust that is to be returned to customers in future rate proceedings.

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Remaining Recovery Period of Regulatory Asset, Debt Issuance Costs

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remaining recovery period of regulatory assets, deferred capital projects

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Remaining recovery period of regulatory assets, Price Risk Management, for which no return on investment during recovery period is provided.

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Remaining refund period of regulatory liability, Trojan decommissioning activities

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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.

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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.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences derived regulatory assets and liabilities.

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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.

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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.

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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

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