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Loans - Summary of Undrawn Credit Facilities and Other Off Balance Sheet Exposures (Detail) - CAD ($) $ in Millions | Jul. 31, 2025 | Apr. 30, 2025 | Oct. 31, 2024 | Jul. 31, 2024
--- | --- | --- | --- | ---
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | $ 467,934 |  | $ 440,411 |
ECL allowance | 303 | $ 264 |  | $ 198
Net credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 465,938 |  | 429,783 |
Retail [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
ECL allowance | 180 |  | 94 |
Retail [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 210,579 |  | 200,806 |
Retail [member] | Net credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 210,399 |  | 200,712 |
Retail [member] | Exceptionally Low [Member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 173,525 |  | 164,694 |
Retail [member] | Very Low [Member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 14,911 |  | 15,116 |
Retail [member] | Low [Member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 16,717 |  | 15,972 |
Retail [member] | Medium [Member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 3,840 |  | 3,543 |
Retail [member] | High [Member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 930 |  | 864 |
Retail [member] | Default [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 46 |  | 43 |
Retail [member] | Not Rated [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 610 |  | 574 |
Business and government [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
ECL allowance | 123 |  | 103 |
Business and government [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 255,662 |  | 229,174 |
Business and government [member] | Net credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 255,539 |  | 229,071 |
Business and government [member] | Investment grade [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 175,280 |  | 157,131 |
Business and government [member] | Non-investment grade [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 78,188 |  | 69,806 |
Business and government [member] | Watch list [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 902 |  | 906 |
Business and government [member] | Default [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 224 |  | 123 |
Business and government [member] | Not Rated [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 1,068 |  | 1,208 |
Stage 1 [member] | 12-month expected credit losses [member] | Financial instruments not credit-impaired [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
ECL allowance | 119 | 114 |  | 90
Stage 1 [member] | 12-month expected credit losses [member] | Financial instruments not credit-impaired [member] | Net credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 457,026 |  | 422,227 |
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
ECL allowance | 53 |  | 42 |
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 206,250 |  | 197,830 |
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Net credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 206,197 |  | 197,788 |
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Exceptionally Low [Member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 173,343 |  | 164,577 |
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Very Low [Member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 14,431 |  | 15,112 |
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Low [Member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 14,949 |  | 14,988 |
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Medium [Member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 2,418 |  | 2,263 |
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | High [Member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 507 |  | 325 |
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Not Rated [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 602 |  | 565 |
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
ECL allowance | 66 |  | 54 |
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 250,895 |  | 224,493 |
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Net credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 250,829 |  | 224,439 |
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Investment grade [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 174,625 |  | 156,560 |
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Non-investment grade [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 75,201 |  | 66,788 |
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Watch list [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 57 |  | 28 |
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Not Rated [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 1,012 |  | 1,117 |
Stage 2 [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
ECL allowance | 176 | 141 |  | 97
Stage 2 [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Net credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 8,650 |  | 7,399 |
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
ECL allowance | 127 |  | 52 |
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 4,283 |  | 2,933 |
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Net credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 4,156 |  | 2,881 |
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Exceptionally Low [Member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 182 |  | 117 |
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Very Low [Member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 480 |  | 4 |
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Low [Member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 1,768 |  | 984 |
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Medium [Member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 1,422 |  | 1,280 |
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | High [Member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 423 |  | 539 |
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Not Rated [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 8 |  | 9 |
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
ECL allowance | 49 |  | 40 |
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 4,543 |  | 4,558 |
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Net credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 4,494 |  | 4,518 |
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Investment grade [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 655 |  | 571 |
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Non-investment grade [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 2,987 |  | 3,018 |
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Watch list [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 845 |  | 878 |
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Not Rated [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 56 |  | 91 |
Stage 3 [member] | Financial instruments credit-impaired [member] | Net credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 262 |  | 157 |
Stage 3 [member] | Retail [member] | Financial instruments credit-impaired [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 46 |  | 43 |
Stage 3 [member] | Retail [member] | Financial instruments credit-impaired [member] | Net credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 46 |  | 43 |
Stage 3 [member] | Retail [member] | Financial instruments credit-impaired [member] | Default [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 46 |  | 43 |
Stage 3 [member] | Business and government [member] | Financial instruments credit-impaired [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
ECL allowance | 8 |  | 9 |
Stage 3 [member] | Business and government [member] | Financial instruments credit-impaired [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 224 |  | 123 |
Stage 3 [member] | Business and government [member] | Financial instruments credit-impaired [member] | Net credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 216 |  | 114 |
Stage 3 [member] | Business and government [member] | Financial instruments credit-impaired [member] | Default [member] | Gross credit exposure [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
Credit exposure | 224 |  | $ 123 |
Stage 3 [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] |  |  |  |
Disclosure of internal credit grades [line items] |  |  |  |
ECL allowance | $ 8 | $ 9 |  | $ 11

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