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Derivatives Instruments (Credit Risk) (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 CAD ($) Days	Dec. 31, 2023 CAD ($)
Credit Derivatives [Line Items]
Total cash deposits/collateral on hand	$ 198	$ 101
Financial Asset, Past Due [Member]
Credit Derivatives [Line Items]
Financial assets, considered to be past due	140	142
Credit Concentration Risk
Credit Derivatives [Line Items]
Concentration Risk, maximum exposure	1,300	1,200
Total cash deposits/collateral on hand	303	310
Credit Concentration Risk | Receivables, net
Credit Derivatives [Line Items]
Fair Value, Financial assets, considered to be past due	$ 128	$ 127
Average number of days financial asset outstanding | Days	61

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The average number of days outstanding for financial assets, considered o be past due.

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as noncurrent.

+ References

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Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Fair value of account receivable subject to concentration of credit or market risk or both.

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