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Risk Management Activities - Hedged Items on the Statement of Financial Position (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about hedging instruments [line items]
Carrying amount	$ 3	$ 2
Physical power sales | Cash flow hedges | Commodity risk management
Disclosure of detailed information about hedging instruments [line items]
Carrying amount		285
Hedging instrument, liabilities	(347)
Change in fair value used for measuring ineffectiveness	(594)	(181)
Reserve of cash flow hedges	(279)	226
Interest Expense On Long-Term Debt | Cash flow hedges | Interest rate risk
Disclosure of detailed information about hedging instruments [line items]
Change in fair value used for measuring ineffectiveness	0	3
Reserve of cash flow hedges	0	2
Foreign-denominated debt | Net Investment Hedge | Currency risk
Disclosure of detailed information about hedging instruments [line items]
Carrying amount	502	473
Change in fair value used for measuring ineffectiveness	0	0
Reserve of cash flow hedges	$ (39)	$ (35)

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ 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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The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [member]]

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The amount of a hedging instrument, recognised as a liability. [Refer: Hedging instruments [member]]

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- Definition

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]]

+ References

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