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Pensions and Other Post-Employment Benefits - Summary of Fair Value of the Plan Assets (Detail) - CAD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Pensions And Other Post Employment Benefits [Abstract]
Level 1 – Cash and Cash Equivalents	$ 3	$ 5
Level 2 – Equity and Fixed Income Funds	185	161
Level 3 – Real Estate Funds and Other	13	12
Total plan assets, at fair value	$ 201	$ 178

X

- Definition

Pensions and other post employment benefits.

+ References

No definition available.

+ Details

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X

- Definition

Real estate funds contributed to fair value of plan assets.

+ References

No definition available.

+ Details

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X

- Definition

The amount cash and cash equivalents contribute to the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
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X

- Definition

The amount investment funds contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]; Investment funds [member]]

+ References

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-Name IAS
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- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

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-Name IAS
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