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Price Risk Management Net volumes related to price risk management activities (Details) In Millions | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Commodity contracts: |  |
Electricity | 12 | 9
Natural gas | 82 | 93
Foreign currency | 11 | 7

X
- Definition Commodity contracts: [Abstract] + Details
Name: | por_CurrentAssetsCommodityContractsAbstract
Namespace Prefix: | por
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net volume associated with the reporting entity's derivative instruments recorded as of the balance sheet date having arisen from price risk management activities related to natural gas. + Details
Name: | por_VolumeRelatedToDerivativeInstrumentsAtBalanceSheetDateCommodityContractsNaturalGas
Namespace Prefix: | por
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | instant

X
- Definition Net volume related to the reporting entity's derivative instruments as of the balance sheet date having arisen from price risk management activities. + Details
Name: | por_VolumeRelatedToDerivativeInstrumentsHeldAtBalanceSheetDateCommodityContractsElectricity
Namespace Prefix: | por
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | instant

X
- Definition Net volume associated with the reporting entity's derivative instruments recorded as of the balance sheet date having arisen from price risk management activities related to foreign currency. + Details
Name: | por_VolumeRelatedToDerivativeInstrumentsHeldAtBalanceSheetDateForeignCurrency
Namespace Prefix: | por
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | instant