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Price Risk Management Net volumes related to price risk management activities (Details) MWh in Millions, MMBTU in Millions, CAD in Millions	Jun. 30, 2015 CAD MMBTU MWh	Dec. 31, 2014 CAD MMBTU MWh
Commodity contracts:
Electricity	12	16
Natural gas | MMBTU	129	127
Foreign currency | CAD	CAD 7	CAD 7

X

- Definition

Commodity contracts: [Abstract]

+ References

No definition available.

+ 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

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