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Net volumes related to price risk management activities (Details) (CAD) In Millions, unless otherwise specified	Dec. 31, 2014 MMBTU MWh	Dec. 31, 2013 MWh MMBTU
Commodity contracts: [Abstract]
Electricity	16,000,000por_VolumeRelatedToDerivativeInstrumentsHeldAtBalanceSheetDateCommodityContractsElectricity	14,000,000por_VolumeRelatedToDerivativeInstrumentsHeldAtBalanceSheetDateCommodityContractsElectricity
Natural gas	127,000,000por_VolumeRelatedToDerivativeInstrumentsAtBalanceSheetDateCommodityContractsNaturalGas	106,000,000por_VolumeRelatedToDerivativeInstrumentsAtBalanceSheetDateCommodityContractsNaturalGas
Foreign currency exchange	7por_VolumeRelatedtoDerivativeInstrumentsHeldatBalanceSheetDateForeignCurrency	7por_VolumeRelatedtoDerivativeInstrumentsHeldatBalanceSheetDateForeignCurrency

X

- Details

Name:	por_CommodityContractsAbstract
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

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:	debit
Period Type:	instant