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Other Liabilities - Summary of lease payments to be made (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
--- | --- | ---
Disclosure of Operating Lease Undiscounted Lease Liabilities [Line Items] |  |
Gross lease liabilities | $ 3,974 | $ 3,631
Within 1 year [member] |  |
Disclosure of Operating Lease Undiscounted Lease Liabilities [Line Items] |  |
Gross lease liabilities | 393 | 410
1 to 2 years [member] |  |
Disclosure of Operating Lease Undiscounted Lease Liabilities [Line Items] |  |
Gross lease liabilities | 405 | 404
2 to 3 years [member] |  |
Disclosure of Operating Lease Undiscounted Lease Liabilities [Line Items] |  |
Gross lease liabilities | 390 | 401
3 to 4 years [member] |  |
Disclosure of Operating Lease Undiscounted Lease Liabilities [Line Items] |  |
Gross lease liabilities | 387 | 381
4 to 5 years [member] |  |
Disclosure of Operating Lease Undiscounted Lease Liabilities [Line Items] |  |
Gross lease liabilities | 376 | 358
After 5 years [member] |  |
Disclosure of Operating Lease Undiscounted Lease Liabilities [Line Items] |  |
Gross lease liabilities | $ 2,023 | $ 1,677

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