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Net volumes related to price risk management activities (Details) MWh in Millions, MMBTU in Millions, $ in Millions	Dec. 31, 2024 CAD ($) MWh MMBTU	Dec. 31, 2023 CAD ($) MMBTU MWh
Price Risk Management [Abstract]
Electricity | MWh	2	3
Natural gas | MMBTU	199	213
Foreign currency exchange | $	$ 34	$ 20

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- Definition

Price Risk Management [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

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Namespace Prefix:	por_
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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_
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Balance Type:	na
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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