Net volumes related to price risk management activities (Details) MWh in Millions, MMBTU in Millions, $ in Millions	Dec. 31, 2022 CAD ($) MMBTU MWh	Dec. 31, 2021 CAD ($) MMBTU MWh
Price Risk Management [Abstract]
Electricity \| MWh	6	4
Natural gas \| MMBTU	211	181
Foreign currency exchange \| $	$ 10	$ 19

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.

No definition available.

Name:	por_VolumeRelatedToDerivativeInstrumentsAtBalanceSheetDateCommodityContractsNaturalGas
Namespace Prefix:	por_
Data Type:	dtr-types:energyItemType
Balance Type:	na
Period Type:	instant