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Price Risk Management Counterparties Representing 10% or More (Details) | Mar. 31, 2015 | Dec. 31, 2014
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Assets from price risk management activities: |  |
Counterparty A | 67.00%por_CounterpartyA | 63.00%por_CounterpartyA
Counterparty B | 8.00%por_CounterpartyB | 14.00%por_CounterpartyB
Total | 75.00%por_ConcentrationOfRiskDerivativeInstrumentsAssets | 77.00%por_ConcentrationOfRiskDerivativeInstrumentsAssets
Liabilities from price risk management activities: |  |
Counterparty C | 31.00%por_CounterpartyDforPRMLiab | 22.00%por_CounterpartyDforPRMLiab
Counterparty D | 9.00%por_CounterpartyEForPRMLiab | 12.00%por_CounterpartyEForPRMLiab
Total | 40.00%por_ConcentrationOfRiskDerivativeInstrumentsLiabilities | 34.00%por_ConcentrationOfRiskDerivativeInstrumentsLiabilities

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- Details
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- Definition Represents aggregate of individually significant counterparties of total assets arising from derivative instruments from price risk management activities. + References No definition available. + Details
Name: | por_ConcentrationOfRiskDerivativeInstrumentsAssets
Namespace Prefix: | por_
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- Definition Represents aggregate of individually significant counterparties of total liabilities arising from derivative instruments from price risk management activities. + References No definition available. + Details
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Namespace Prefix: | por_
Data Type: | num:percentItemType
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- Definition Individually significant counterparty of total assets arising from derivative instruments from price risk management activities. + References No definition available. + Details
Name: | por_CounterpartyA
Namespace Prefix: | por_
Data Type: | num:percentItemType
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- Definition Individually significant counterparty of total assets arising from derivative instruments from price risk management activities. + References No definition available. + Details
Name: | por_CounterpartyB
Namespace Prefix: | por_
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- Definition Counterparty D for PRM Liab + References No definition available. + Details
Name: | por_CounterpartyDforPRMLiab
Namespace Prefix: | por_
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Period Type: | instant

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- Definition Counterparty E For PRM Liab + References No definition available. + Details
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Namespace Prefix: | por_
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Balance Type: | na
Period Type: | instant

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- Details
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