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Share Capital - Additional Information (Detail) $ / shares in Units, $ / shares in Units, $ in Millions, $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 11 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 24, 2025 CAD ($) shares | Nov. 05, 2024 USD ($) | Jul. 31, 2025 CAD ($) $ / shares shares | Jan. 31, 2025 CAD ($) $ / shares shares | Jul. 31, 2025 CAD ($) $ / shares shares | Jul. 31, 2025 CAD ($) $ / shares shares | Oct. 31, 2023 | Jul. 14, 2025 CAD ($) | Mar. 24, 2025 $ / shares | Oct. 31, 2024 | Nov. 01, 2023
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |  |  |  |  |
Regulatory capital requirements, domestic Stability Buffer |  |  |  |  |  |  |  |  |  |  | 3.00%
Minimum leverage ratio |  |  | 3.50% |  | 3.50% | 3.50% |  |  |  |  |
Domestic systemically important bank buffer |  |  | 0.50% |  | 0.50% | 0.50% |  |  |  |  |
Minimum TLAC ratio |  |  | 32.90% |  | 32.90% | 32.90% |  |  |  | 30.30% |
Minimum TLAC leverage ratio |  |  | 9.20% |  | 9.20% | 9.20% |  |  |  | 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% |  | 3.50% | 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% |  | 21.50% | 21.50% |  |  |  |  |
Minimum TLAC leverage ratio |  |  | 7.25% |  | 7.25% | 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% |  | 3.50% | 3.50% |  |  |  |  |
Floating interest rate [member] | Six Point Three Six Nine Percent Of Limited Recourse Capital Notes Series Six [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate basis | Starting on April 28, 2030, and every five years thereafter until April 28, 2080, the interest rate will be reset to be equal to the then current five-year Government of Canada yield plus 3.65% per annum. |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate adjustment | 3.65% |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |
Non Cumulative Rate Reset Series Sixty One Class Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |  |  |  |  |
Dividend in addition to government of Canada bond yield | 3.65% |  |  |  |  |  |  |  |  |  |
Proceeds from issue of preference shares | $ 150 |  |  |  |  |  |  |  |  |  |
Par value per share | $ / shares |  |  |  |  |  |  |  |  | $ 1,000 |  |
Number of shares issued | shares | 150,000 |  |  |  |  |  |  |  |  |  |
Ordinary shares [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |  |  |  |  |
Reduction of issued capital |  |  | $ 100 |  | $ 272 |  |  |  |  |  |
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 |  |  |  |  |  |  |
Non Cumulative Rate Reset Series Forty Three 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 |  | $ 0.25 | $ 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] |  |  |  |  |  |  |  |  |  |  |
Stock repurchased and cancelled during the period value |  |  | $ 528 |  | $ 1,338 | $ 1,757 |  |  |  |  |
Share repurchase, average price per share | $ / shares |  |  | $ 95.89 |  |  |  |  |  |  |  |
Stock repurchased and cancelled during the period shares | shares |  |  | 5,500,000 |  | 15,000,000 | 20,000,000 |  |  |  |  |
October 28, 2085 [member] | Fixed interest rate [member] | Seven Percent Limited Recourse Capital Notes Series Seven Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |  |  |  |  |
Share conversion basis |  |  | Subject to regulatory approval, we may redeem the LRCN Series 7 Notes, in whole or in part, on each January 28, April 28, July 28, and October 28, commencing on January 28, 2030, at par. |  |  |  |  |  |  |  |
Borrowings adjustment to interest payable basis |  |  | Starting on October 28, 2030, and every five years thereafter until October 28, 2080, the interest rate will be reset to the then current five-year U.S. Treasury Rate plus 3.000% per annum. |  |  |  |  |  |  |  |
Borrowings maturity |  |  | October 28, 2085 |  |  |  |  |  |  |  |
Borrowings, Interest Rate |  |  |  |  |  |  |  | 7.00% |  |  |
Notional amount |  |  |  |  |  |  |  | $ 750 |  |  |
January 28, 2030 [member] | Six Point Three Six Nine Percent Of Limited Recourse Capital Notes Series Six [Member] | Limited Recourse Capital Notes Series [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings maturity | April 28, 2085 |  |  |  |  |  |  |  |  |  |
Borrowings, Interest Rate | 6.369% |  |  |  |  |  |  |  |  |  |
Notional amount | $ 450 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Restatement [Member] | Non Cumulative Rate Reset Series Sixty One Class Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |  |  |  |  |
Dividend Payable Rate Percentage | 6.369% |  |  |  |  |  |  |  |  |  |

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