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Share Capital - Additional Information (Detail) $ / shares in Units, $ / shares in Units, $ in Millions, $ in Millions |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 05, 2024 USD ($) | Sep. 06, 2024 CAD ($) shares | Sep. 06, 2024 $ / shares shares | Jan. 31, 2025 CAD ($) $ / shares shares | Oct. 31, 2023 | Oct. 31, 2024 | Nov. 01, 2023
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |
Reduction of issued capital |  |  |  | $ 63 |  |  |
Regulatory capital requirements, domestic Stability Buffer |  |  |  |  |  |  | 3.00%
Minimum leverage ratio |  |  |  | 3.50% |  |  |
Domestic systemically important bank buffer |  |  |  | 0.50% |  |  |
Minimum TLAC ratio |  |  |  | 31.40% |  | 30.30% |
Minimum TLAC leverage ratio |  |  |  | 8.90% |  | 8.70% |
Higher Buffer Rate [member] |  |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |
Regulatory capital requirements, domestic Stability Buffer |  |  |  | 3.50% |  |  |
Basel III requirement [member] |  |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |
Canada Domestic systemically important bank CET1 surcharge |  |  |  |  | 1.00% |  |
Minimum TLAC ratio |  |  |  | 21.50% |  |  |
Minimum TLAC leverage ratio |  |  |  | 7.25% |  |  |
Bottom of range [member] | Basel III requirement [member] |  |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |
CET1 ratio |  |  |  | 11.50% |  |  |
Tier 1 capital ratio |  |  |  | 13.00% |  |  |
Total capital ratio |  |  |  | 15.00% |  |  |
Minimum TLAC ratio |  |  |  | 3.50% |  |  |
Floating interest rate [member] | Six Point Nine Fifty Percent Limited Recourse Capital Notes Series Five [Member] |  |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |
Borrowings, interest rate basis | Starting on January 28, 2030, and every five years thereafter until January 28, 2080, the interest rate will be reset to the then current five-year U.S. Treasury Rate plus 2.833% per annum. |  |  |  |  |  |
Borrowings, interest rate adjustment | 2.833% |  |  |  |  |  |
Ordinary shares [member] |  |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |
Purchase of common shares for cancellation, Number of shares | shares |  |  |  | 3,500,000 |  |  |
Reduction of issued capital |  |  |  | $ 63 |  |  |
Non Cumulative Rate Reset Series Forty One Class Preferred Shares [Member] |  |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |
Number Of Shares Redeemed | shares |  |  |  | 12,000,000 |  |  |
Redemption price per share | $ / shares |  |  |  | $ 0.25 |  |  |
Reduction of issued capital |  |  |  | $ 300 |  |  |
Normal Course Issuer Bid [Member] | XTSE [Member] | Ordinary shares [member] |  |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |
Purchase of common shares for cancellation, Number of shares | shares |  | 3,500,000 |  |  |  |  |
Threshold Date On Or Before Which Share Repurchase Shall Be Completed |  | Sep. 09, 2025 |  |  |  |  |
Shares Repurchased And Cancelled Average Price Per Share | $ / shares |  |  | $ 91.59 |  |  |  |
Share Repurchase Eligible Subject To Purchase Of Common Shares Threshold Minimum | shares |  | 20 | 20 |  |  |  |
Reduction of issued capital |  | $ 320 |  |  |  |  |
January 28, 2030 [member] | Six Point Nine Fifty Percent Limited Recourse Capital Notes Series Five [Member] | Limited Recourse Capital Notes Series [Member] |  |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |
Borrowings maturity | January 28, 2085 |  |  |  |  |  |
Borrowings, interest rate | 6.95% |  |  |  |  |  |
Notional amount | $ 500 |  |  |  |  |  |

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