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Net volumes related to price risk management activities (Details) MWh in Millions, MMBTU in Millions, CAD in Millions	Dec. 31, 2017 CAD MMBTU MWh	Dec. 31, 2016 CAD MMBTU MWh
Commodity contracts: [Abstract]
Electricity | MWh	7	8
Natural gas | MMBTU	114	107
Foreign currency exchange | CAD	CAD 21	CAD 22

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- Definition

Commodity contracts: [Abstract]

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No definition available.

+ Details

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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.

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No definition available.

+ Details

Name:	por_VolumeRelatedToDerivativeInstrumentsAtBalanceSheetDateCommodityContractsNaturalGas
Namespace Prefix:	por_
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Balance Type:	na
Period Type:	instant

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- 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

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- 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.

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No definition available.

+ Details

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