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Price Risk Management Counterparties Representing 10% or More of Assets and Liabilities from price risk management activities (Details) | Jun. 30, 2016 | Dec. 31, 2015
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Assets from price risk management activities: |  |
Counterparty A | 22.00% | 5.00%
Counterparty B | 21.00% | 59.00%
Counterparty C | 6.00% | 10.00%
Total | 49.00% | 74.00%
Liabilities from price risk management activities: |  |
Counterparty D | 57.00% | 36.00%
Counterparty B | 9.00% | 10.00%
Counterparty E | 7.00% | 10.00%
Total | 73.00% | 56.00%

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- Definition Assets from price risk management activities: [Abstract] + References No definition available. + 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
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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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- 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_
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Balance Type: | na
Period Type: | instant

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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
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Namespace Prefix: | por_
Data Type: | num:percentItemType
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- Definition Individually significant counterparty of total liabilities arising from derivative instruments from price risk management activities. + References No definition available. + Details
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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_CounterpartyC
Namespace Prefix: | por_
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- Definition Counterparty D for PRM Liab + References No definition available. + Details
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- Definition Counterparty E For PRM Liab + References No definition available. + Details
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- Definition Liabilities from price risk management activities: [Abstract] + References No definition available. + Details
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