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Risk Management Net volumes related to price risk management activities (Details) MWh in Millions, MMBTU in Millions, $ in Millions	Jun. 30, 2019 CAD ($) MMBTU MWh	Dec. 31, 2018 CAD ($) MMBTU MWh
Commodity contracts:
Electricity | MWh	6	5
Natural gas | MMBTU	142	123
Foreign currency | $	$ 21	$ 18

X

- Definition

Commodity contracts: [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	por_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- 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

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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

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Namespace Prefix:	por_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant