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Loans - Summary of Undrawn Credit Facilities and Other Off Balance Sheet Exposures (Detail) - CAD ($) $ in Millions | Jan. 31, 2025 | Oct. 31, 2024 | Jan. 31, 2024
--- | --- | --- | ---
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | $ 445,742 | $ 440,411 |
ECL allowance | 272 | 197 | $ 162
Net credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 444,716 | 429,783 |
Retail [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
ECL allowance | 175 | 94 |
Retail [member] | Gross credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 203,643 | 200,806 |
Retail [member] | Net credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 203,468 | 200,712 |
Retail [member] | Exceptionally Low [Member] | Gross credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 166,173 | 164,694 |
Retail [member] | Very Low [Member] | Gross credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 15,359 | 15,116 |
Retail [member] | Low [Member] | Gross credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 16,860 | 15,972 |
Retail [member] | Medium [Member] | Gross credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 3,747 | 3,543 |
Retail [member] | High [Member] | Gross credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 870 | 864 |
Retail [member] | Default [member] | Gross credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 45 | 43 |
Retail [member] | Not Rated [member] | Gross credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 589 | 574 |
Business and government [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
ECL allowance | 97 | 103 |
Business and government [member] | Gross credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 241,345 | 229,174 |
Business and government [member] | Net credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 241,248 | 229,071 |
Business and government [member] | Investment grade [member] | Gross credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 165,324 | 157,131 |
Business and government [member] | Non-investment grade [member] | Gross credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 73,859 | 69,806 |
Business and government [member] | Watch list [member] | Gross credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 910 | 906 |
Business and government [member] | Default [member] | Gross credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 205 | 123 |
Business and government [member] | Not Rated [member] | Gross credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 1,047 | 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 | 111 | 96 | 85
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 | 435,769 | 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 | 55 | 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 | 199,285 | 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 | 199,230 | 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 | 165,728 | 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 | 15,061 | 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 | 15,495 | 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 | 2,100 | 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 | 319 | 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 | 582 | 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 | 56 | 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 | 236,595 | 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 | 236,539 | 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 | 164,733 | 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 | 70,837 | 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 | 20 | 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 | 1,005 | 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 | 152 | 92 | 76
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 | 8,706 | 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 | 120 | 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 | 4,313 | 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 | 4,193 | 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 | 445 | 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 | 298 | 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 | 1,365 | 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 | 1,647 | 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 | 551 | 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 | 7 | 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 | 32 | 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 | 4,545 | 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 | 4,513 | 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 | 591 | 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 | 3,022 | 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 | 890 | 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 | 42 | 91 |
Stage 3 [member] | Financial instruments credit-impaired [member] | Net credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 241 | 157 |
Stage 3 [member] | Retail [member] | Financial instruments credit-impaired [member] | Gross credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 45 | 43 |
Stage 3 [member] | Retail [member] | Financial instruments credit-impaired [member] | Net credit exposure [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit exposure | 45 | 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 | 45 | 43 |
Stage 3 [member] | Business and government [member] | Financial instruments credit-impaired [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
ECL allowance | 9 | 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 | 205 | 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 | 196 | 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 | 205 | 123 |
Stage 3 [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
ECL allowance | $ 9 | $ 9 | $ 1

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