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Related Party Transactions - Summary of Compensation of Key Management Personnel (Detail) - CAD ($) $ in Millions		12 Months Ended
		Oct. 31, 2025	Oct. 31, 2024
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [abstract]
Base salary and incentives		$ 29	$ 20
Post-employment benefits		2	2
Share-based payments	[1]	54	37
Total key management personnel compensation		$ 85	$ 59
[1] Amounts included in share-based payments are the fair values of awards granted in the year.

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- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

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

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

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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]]

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