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Related Party Transactions - Aggregate Compensation to Executive Team and Directors (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 CAD ($) individual	Dec. 31, 2023 CAD ($) individual
Executive team
Disclosure of transactions between related parties [line items]
Number of individuals | individual	14	12
Base salary and annual incentive compensation	$ 24	$ 26
Additional short-term benefits and other	1	1
Share-based long-term incentive compensation	47	28
Value of pension and post-retirement benefits	2	2
Severance	$ 5	$ 0
Directors
Disclosure of transactions between related parties [line items]
Number of individuals | individual	13	11
Base salary and annual incentive compensation	$ 0	$ 0
Additional short-term benefits and other	0	0
Share-based long-term incentive compensation	4	4
Value of pension and post-retirement benefits	0	0
Severance	$ 0	$ 0

X

- 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 amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2024-01-01
-Paragraph 17
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_17_b&doctype=Standard
-URIDate 2024-03-27

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- Definition

The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2024-01-01
-Paragraph 17
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_17_e&doctype=Standard
-URIDate 2024-03-27

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- Definition

The amount of compensation to key management personnel in the form of short-term employee benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2024-01-01
-Paragraph 17
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_17_a&doctype=Standard
-URIDate 2024-03-27

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- Definition

The amount of compensation to key management personnel in the form of termination benefits. [Refer: Termination benefits expense; Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2024-01-01
-Paragraph 17
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_17_d&doctype=Standard
-URIDate 2024-03-27

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- Definition

Key Management Personnel Compensation, Additional Short-Term Benefits And Other

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- Definition

Key Management Personnel Compensation, Number of Individuals

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