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Price Risk Management Counterparties Representing 10% or More of Assets and Liabilities from price risk management activities (Details) | Sep. 30, 2016 | Dec. 31, 2015
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Assets from price risk management activities: |  |
Counterparty A | 34.00% | 5.00%
Counterparty B | 12.00% | 8.00%
Counterparty C | 10.00% | 8.00%
Counterparty D | 7.00% | 10.00%
Counterparty E | 2.00% | 59.00%
Total | 65.00% | 90.00%
Liabilities from price risk management activities: |  |
Counterparty F | 61.00% | 36.00%
Counterparty C | 8.00% | 10.00%
Counterparty B | 7.00% | 10.00%
Total | 76.00% | 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_
Data Type: | num:percentItemType
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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_
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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
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
Name: | por_CounterpartyB
Namespace Prefix: | por_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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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Namespace Prefix: | por_
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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_
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_CounterpartyD
Namespace Prefix: | por_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Counterparty D for PRM Liab + References No definition available. + Details
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Namespace Prefix: | por_
Data Type: | num:percentItemType
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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
Name: | por_CounterpartyE
Namespace Prefix: | por_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Definition Liabilities from price risk management activities: [Abstract] + References No definition available. + Details
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