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Equity - Summary of Classes of Preferred and Common Shares Outstanding (Detail) $ / shares in Units, $ in Millions | 12 Months Ended
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Oct. 31, 2025 CAD ($) $ / shares shares | Oct. 31, 2025 $ / shares | Oct. 31, 2024 CAD ($) $ / shares shares | Oct. 31, 2024 $ / shares
Disclosure of classes of share capital [line items] |  |  |  |
Balance at beginning of year | $ 84,286 |  |  |
Balance at end of year | $ 88,100 |  | $ 84,286 |
Class B Series 31 [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Balance at beginning of year (shares) | shares | 12,000,000 |  |  |
Balance at end of year (shares) | shares |  |  | 12,000,000 |
Balance at beginning of year | $ 300 |  |  |
Balance at end of year |  |  | $ 300 |
Dividend declared per share | $ / shares |  |  |  | $ 0.96
Class B Series 33 [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Balance at beginning of year (shares) | shares | 8,000,000 |  |  |
Balance at end of year (shares) | shares |  |  | 8,000,000 |
Balance at beginning of year | $ 200 |  |  |
Balance at end of year |  |  | $ 200 |
Dividend declared per share | $ / shares |  | $ 0.57 |  | 0.76
Class B Series 44 [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Balance at beginning of year (shares) | shares | 16,000,000 |  |  |
Balance at end of year (shares) | shares | 16,000,000 |  | 16,000,000 |
Balance at beginning of year | $ 400 |  |  |
Balance at end of year | $ 400 |  | $ 400 |
Dividend declared per share | $ / shares |  | 1.7 |  | 1.7
Class B Series 50 [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Balance at beginning of year (shares) | shares | 500,000 |  |  |
Balance at end of year (shares) | shares | 500,000 |  | 500,000 |
Balance at beginning of year | $ 500 |  |  |
Balance at end of year | $ 500 |  | $ 500 |
Dividend declared per share | $ / shares |  | 73.73 |  | 73.73
Class B Series 52 [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Balance at beginning of year (shares) | shares | 650,000 |  |  |
Balance at end of year (shares) | shares | 650,000 |  | 650,000 |
Balance at beginning of year | $ 650 |  |  |
Balance at end of year | 650 |  | $ 650 |
Dividend declared per share | $ / shares |  | 70.57 |  | 70.57
Preferred shares [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Balance at beginning of year | 2,050 |  |  |
Balance at end of year | 1,550 |  | 2,050 |
Other Equity Instruments [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Balance at beginning of year | 6,037 |  |  |
Balance at end of year | 7,406 |  | 6,037 |
Preferred Shares and Other Equity Instruments [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Balance at beginning of year | 8,087 |  | 6,958 |
Balance at end of year | $ 8,956 |  | $ 8,087 |
Common Shares [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Balance at beginning of year (shares) | shares | 729,529,876 |  | 720,909,161 |
Issued under the Shareholder Dividend Reinvestment and Share Purchase Plan (shares) | shares |  |  | 7,790,724 |
Issued under the Stock Option Plan and other stock-based compensation plans (shares) | shares | 1,520,631 |  | 811,652 |
Purchased for cancellation and treasury shares sold/purchased (shares) | shares | (22,200,000) |  |  |
Treasury shares sold | shares | 55,172 |  | 18,339 |
Balance at end of year (shares) | shares | 708,905,679 |  | 729,529,876 |
Balance at beginning of year | $ 23,921 |  | $ 22,941 |
Issued under the Shareholder Dividend Reinvestment and Share Purchase Plan |  |  | 905 |
Issued under the Stock Option Plan and other stock-based compensation plans | 161 |  | 74 |
Treasury shares sold | 7 |  | 1 |
Purchased for cancellation and treasury shares sold/purchased | (730) |  |  |
Balance at end of year | $ 23,359 |  | $ 23,921 |
Dividend declared per share | (per share) | $ 6.44 | $ 6.44 | $ 6.12 | $ 6.12
4.800% Additional Tier 1 Capital Notes (AT1 Notes) [member] | Other Equity Instruments [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Balance at beginning of year | $ 658 |  |  |
Balance at end of year | 658 |  | $ 658 |
4.300% LRCNs, Series 1 [member] | Other Equity Instruments [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Balance at beginning of year | 1,250 |  |  |
Balance at end of year | 1,250 |  | 1,250 |
5.625% LRCNs, Series 2 [member] | Other Equity Instruments [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Balance at beginning of year | 750 |  |  |
Balance at end of year | 750 |  | 750 |
7.325% LRCNs, Series 3 [member] | Other Equity Instruments [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Balance at beginning of year | 1,000 |  |  |
Balance at end of year | 1,000 |  | 1,000 |
7.700% LRCNs, Series 4 [member] | Other Equity Instruments [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Balance at beginning of year | 1,356 |  |  |
Balance at end of year | 1,356 |  | 1,356 |
7.300% LRCNs, Series 5 [member] | Other Equity Instruments [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Balance at beginning of year | 1,023 |  |  |
Balance at end of year | 1,023 |  | $ 1,023 |
6.875% LRCNs, Series 6 [member] | Other Equity Instruments [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Balance at end of year | $ 1,369 |  |  |

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