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Post-Employment Benefits - Summary of Net Remeasurement Gains (Losses) Recognized in OCI (Parenthetical) (Detail) - CAD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jul. 31, 2025	Jul. 31, 2025
Pension plan [member]
Disclosure of defined benefit plans [line items]
Transfer of accumulated actuarial losses to retained earnings	$ 5	$ 5

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- Definition

Transfer of accumulated actuarial losses to retained earnings.

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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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No definition available.

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