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Fair Value of FInancial Instruments Fair Value Options Quantitative Disclosure (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Minimum [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | $ 11.97 por_ElectricityPhysicalForwardPurchase / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 9.63 por_ElectricityPhysicalForwardPurchase / us-gaap_RangeAxis = us-gaap_MinimumMember
Natural gas financial swaps | 2.88 por_NaturalGasFinancialSwaps / us-gaap_RangeAxis = us-gaap_MinimumMember | 3.16 por_NaturalGasFinancialSwaps / us-gaap_RangeAxis = us-gaap_MinimumMember
Fnancial swaps - electricity | 11.97 por_FnancialSwapsElectricity / us-gaap_RangeAxis = us-gaap_MinimumMember | 9.63 por_FnancialSwapsElectricity / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 122.72 por_ElectricityPhysicalForwardPurchase / us-gaap_RangeAxis = us-gaap_MaximumMember | 77.95 por_ElectricityPhysicalForwardPurchase / us-gaap_RangeAxis = us-gaap_MaximumMember
Natural gas financial swaps | 4.86 por_NaturalGasFinancialSwaps / us-gaap_RangeAxis = us-gaap_MaximumMember | 4.49 por_NaturalGasFinancialSwaps / us-gaap_RangeAxis = us-gaap_MaximumMember
Fnancial swaps - electricity | 39.26 por_FnancialSwapsElectricity / us-gaap_RangeAxis = us-gaap_MaximumMember | 46.07 por_FnancialSwapsElectricity / us-gaap_RangeAxis = us-gaap_MaximumMember
Weighted Average [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 37.43 por_ElectricityPhysicalForwardPurchase / us-gaap_RangeAxis = us-gaap_WeightedAverageMember | 40.18 por_ElectricityPhysicalForwardPurchase / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
Natural gas financial swaps | 3.41 por_NaturalGasFinancialSwaps / us-gaap_RangeAxis = us-gaap_WeightedAverageMember | 3.71 por_NaturalGasFinancialSwaps / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
Fnancial swaps - electricity | 27.88 por_FnancialSwapsElectricity / us-gaap_RangeAxis = us-gaap_WeightedAverageMember | 33.01 por_FnancialSwapsElectricity / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
Assets [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 0 por_ElectricityPhysicalForwardPurchase / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember | 0 por_ElectricityPhysicalForwardPurchase / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember
Natural gas financial swaps | 0 por_NaturalGasFinancialSwaps / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember | 0 por_NaturalGasFinancialSwaps / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember
Fnancial swaps - electricity | 1,000,000 por_FnancialSwapsElectricity / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember | 1,000,000 por_FnancialSwapsElectricity / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember
Total commodity contracts | 1,000,000 por_TotalCommodityContracts / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember | 1,000,000 por_TotalCommodityContracts / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember
Liabilities [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 77,000,000 por_ElectricityPhysicalForwardPurchase / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | 103,000,000 por_ElectricityPhysicalForwardPurchase / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Natural gas financial swaps | 21,000,000 por_NaturalGasFinancialSwaps / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | 23,000,000 por_NaturalGasFinancialSwaps / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Fnancial swaps - electricity | 3,000,000 por_FnancialSwapsElectricity / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | 14,000,000 por_FnancialSwapsElectricity / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Total commodity contracts | $ 101,000,000 por_TotalCommodityContracts / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | $ 140,000,000 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
Name: | us-gaap_EligibleItemOrGroupForFairValueOptionAxis=us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
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: |