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financial instruments - Significant unobservable inputs used in the fair value measurement (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of fair value measurement of assets
Balance of period	$ 58,023	$ 56,136
Assets	58,023	56,136
Virtual power purchase agreements unrealized change in forward element | At fair value | Wind discount risk
Disclosure of fair value measurement of assets
Included in net income, excluding income taxes	(231)
Balance of period	(38)	193	$ 193
Assets	$ (38)	$ 193	$ 193

X

- Definition

The amount of a present economic resource controlled by the entity as a result of past events. Economic resource is a right that has the potential to produce economic benefits.

+ References

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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

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- Definition

The gains (losses) including exchange differences recognised in profit or loss on the fair value measurement of assets. [Refer: At fair value [member]]

+ References

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