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employee future benefits - Other defined benefit plans (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
employee future benefits
Current service cost	$ 10	$ 10
Employee defined benefit plan re-measurements, net	5	1
Other defined benefit plans
employee future benefits
Employee defined benefit plan re-measurements, net	0	$ (2)
First year
employee future benefits
Estimated future benefit payments	1
2 years hence
employee future benefits
Estimated future benefit payments	1
3 years hence
employee future benefits
Estimated future benefit payments	1
4 years hence
employee future benefits
Estimated future benefit payments	1
5 years hence
employee future benefits
Estimated future benefit payments	1
5 years hence to 10 years
employee future benefits
Estimated future benefit payments	$ 4

X

- Definition

The expense of employee service in the current period arising from defined benefit plans. [Refer: Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase in net defined benefit liability (asset) resulting from current service cost]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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 estimate of the amounts expected to be paid from defined benefit plan in future. [Refer: Defined benefit plans [domain]; Maturity [axis]]

+ References

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- Definition

The amount of other comprehensive income, net of tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [domain]; Plan assets [member]; Net defined benefit liability (asset)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income]

+ References

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