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Price Risk Management Net volumes related to price risk management activities (Details) (CAD) In Millions, unless otherwise specified | Sep. 30, 2013 MMBTU MWh | Dec. 31, 2012 MWh MMBTU
--- | --- | ---
Commodity contracts: |  |
Electricity | 12,000,000 | 11,000,000
Natural gas | 104,000,000 | 86,000,000
Oil | (1,000,000) | 0
Foreign currency | 7 | 7

X
- 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. + References No definition available. + Details
Name: | por_VolumeRelatedToDerivativeInstrumentsAtBalanceSheetDateCommodityContractsNaturalGas
Namespace Prefix: | por_
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | instant

X
- Definition VolumeRelatedToDerivativeInstrumentsAtBalanceSheetDateCommodityContractsOil + References No definition available. + Details
Name: | por_Volumerelatedtoderivativeinstrumentsatbalancesheetdatecommoditycontractsoil
Namespace Prefix: | por_
Data Type: | num:energyItemType
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. + References No definition available. + Details
Name: | por_VolumeRelatedToDerivativeInstrumentsHeldAtBalanceSheetDateCommodityContractsElectricity
Namespace Prefix: | por_
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | instant

X
- Definition Net amount 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. + References No definition available. + Details
Name: | por_VolumeRelatedtoDerivativeInstrumentsHeldatBalanceSheetDateForeignCurrency
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant