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Defined Benefit Obligation and Other Long-Term Liabilities - Narrative (Details) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 CAD ($)	Dec. 31, 2023 CAD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2024 CAD ($)	Jun. 30, 2024 USD ($)
Disclosure of fair value measurement of liabilities [line items]
Increase (decrease) in defined benefit obligation	$ (9)
Defined benefit obligation	146	$ 155
Plan assets	257	284		$ 23	$ 17
Voluntary contribution	$ 0	$ 4	$ 3
Increase in discount rates	100.00%
Pro Forma
Disclosure of fair value measurement of liabilities [line items]
Increase (decrease) in defined benefit obligation	$ 34

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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.

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- Definition

The increase (decrease) in the net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 19
-IssueDate 2024-01-01
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- Definition

The amount of non-current net defined benefit liability. [Refer: Net defined benefit liability]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2024-01-01
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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
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-IssueDate 2024-01-01
-Paragraph 57
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Increase in Discount Rates

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Voluntary Contribution

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