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Risk Management Activities - Hedged Items on the Statement of Financial Position (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Physical power sales | Cash flow hedges | Commodity risk management
Disclosure of detailed information about hedging instruments [line items]
Gain (loss) on hedge ineffectiveness	$ (114)	$ (594)
Reserve of cash flow hedges	(129)	(279)
Foreign-denominated Debt | Net Investment Hedge | Currency risk
Disclosure of detailed information about hedging instruments [line items]
Gain (loss) on hedge ineffectiveness	0	0
Reserve of cash flow hedges	$ (36)	$ (39)

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- Definition

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+ References

No definition available.

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- Definition

The gain (loss) on hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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A component of equity representing the accumulated portion of gain (loss) on a hedging instrument that is determined to be an effective hedge for cash flow hedges. [Refer: Cash flow hedges [member]]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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