Pensions and Other Post-Employment Benefits - Summary of Fair Value of the Plan Assets (Detail) - CAD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Pensions And Other Post Employment Benefits [Abstract]
Level 1 – Cash and Cash Equivalents	$ 5	$ 7
Level 2 – Equity and Fixed Income Funds	161	130
Level 3 – Real Estate Funds and Other	12	10
Total plan assets, at fair value	$ 178	$ 147

Pensions and other post employment benefits.

No definition available.

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- Definition

Real estate funds contributed to fair value of plan assets.

+ References

No definition available.

+ Details

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- 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 [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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-Number 19
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-URIDate 2023-03-23

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
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-URIDate 2023-03-23

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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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
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