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Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Low [Member] |  |
Commodity Contracts |  |
Electricity physical forward | $ 10.97 por_ElectricityPhysicalForwardPurchase / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 11.97 por_ElectricityPhysicalForwardPurchase / us-gaap_RangeAxis = us-gaap_MinimumMember
Natural gas financial swaps | 2.48 por_NaturalGasFinancialSwaps / us-gaap_RangeAxis = us-gaap_MinimumMember | 2.88 por_NaturalGasFinancialSwaps / us-gaap_RangeAxis = us-gaap_MinimumMember
Electricity financial futures | 10.97 por_FnancialSwapsElectricity / us-gaap_RangeAxis = us-gaap_MinimumMember | 11.97 por_FnancialSwapsElectricity / us-gaap_RangeAxis = us-gaap_MinimumMember
High [Member] |  |
Commodity Contracts |  |
Electricity physical forward | 95.47 por_ElectricityPhysicalForwardPurchase / us-gaap_RangeAxis = us-gaap_MaximumMember | 122.72 por_ElectricityPhysicalForwardPurchase / us-gaap_RangeAxis = us-gaap_MaximumMember
Natural gas financial swaps | 4.36 por_NaturalGasFinancialSwaps / us-gaap_RangeAxis = us-gaap_MaximumMember | 4.86 por_NaturalGasFinancialSwaps / us-gaap_RangeAxis = us-gaap_MaximumMember
Electricity financial futures | 34.63 por_FnancialSwapsElectricity / us-gaap_RangeAxis = us-gaap_MaximumMember | 39.26 por_FnancialSwapsElectricity / us-gaap_RangeAxis = us-gaap_MaximumMember
Weighted Average [Member] |  |
Commodity Contracts |  |
Electricity physical forward | 33.11 por_ElectricityPhysicalForwardPurchase / us-gaap_RangeAxis = us-gaap_WeightedAverageMember | 37.43 por_ElectricityPhysicalForwardPurchase / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
Natural gas financial swaps | 2.94 por_NaturalGasFinancialSwaps / us-gaap_RangeAxis = us-gaap_WeightedAverageMember | 3.41 por_NaturalGasFinancialSwaps / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
Electricity financial futures | 22.82 por_FnancialSwapsElectricity / us-gaap_RangeAxis = us-gaap_WeightedAverageMember | 27.88 por_FnancialSwapsElectricity / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
Assets [Member] |  |
Commodity Contracts |  |
Electricity physical forward | 0 por_ElectricityPhysicalForwardPurchase / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AssetsMember | 0 por_ElectricityPhysicalForwardPurchase / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AssetsMember
Natural gas financial swaps | 0 por_NaturalGasFinancialSwaps / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AssetsMember | 0 por_NaturalGasFinancialSwaps / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AssetsMember
Electricity financial futures | 2,000,000 por_FnancialSwapsElectricity / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AssetsMember | 1,000,000 por_FnancialSwapsElectricity / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AssetsMember
Total commodity contracts | 2,000,000 por_TotalCommodityContracts / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AssetsMember | 1,000,000 por_TotalCommodityContracts / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AssetsMember
Liabilities [Member] |  |
Commodity Contracts |  |
Electricity physical forward | 112,000,000 por_ElectricityPhysicalForwardPurchase / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | 77,000,000 por_ElectricityPhysicalForwardPurchase / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Natural gas financial swaps | 36,000,000 por_NaturalGasFinancialSwaps / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | 21,000,000 por_NaturalGasFinancialSwaps / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Electricity financial futures | 2,000,000 por_FnancialSwapsElectricity / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | 3,000,000 por_FnancialSwapsElectricity / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Total commodity contracts | $ 150,000,000 por_TotalCommodityContracts / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | $ 101,000,000 por_TotalCommodityContracts / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember

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- Definition Electricity physical forward purchase + References No definition available. + Details
Name: | por_ElectricityPhysicalForwardPurchase
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fnancial swaps - electricity + References No definition available. + Details
Name: | por_FnancialSwapsElectricity
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Natural gas financial swaps + References No definition available. + Details
Name: | por_NaturalGasFinancialSwaps
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Total commodity contracts + References No definition available. + Details
Name: | por_TotalCommodityContracts
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueOptionQuantitativeDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |