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Loans - Summary of Undrawn Credit Facilities and Other Off Balance Sheet Exposures (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
--- | --- | ---
Disclosure of internal credit grades [line items] |  |
Credit exposure | $ 480,883 | $ 440,411
ECL allowance | 347 | 197
Net credit exposure [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 477,814 | 429,783
Retail [member] |  |
Disclosure of internal credit grades [line items] |  |
ECL allowance | 185 | 94
Retail [member] | Gross credit exposure [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 213,209 | 200,806
Retail [member] | Net credit exposure [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 213,024 | 200,712
Retail [member] | Exceptionally Low [Member] | Gross credit exposure [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 176,230 | 164,694
Retail [member] | Very Low [Member] | Gross credit exposure [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 14,809 | 15,116
Retail [member] | Low [Member] | Gross credit exposure [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 16,572 | 15,972
Retail [member] | Medium [Member] | Gross credit exposure [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 3,957 | 3,543
Retail [member] | High [Member] | Gross credit exposure [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 967 | 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 | 628 | 574
Business and government [member] |  |
Disclosure of internal credit grades [line items] |  |
ECL allowance | 162 | 103
Business and government [member] | Gross credit exposure [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 264,952 | 229,174
Business and government [member] | Net credit exposure [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 264,790 | 229,071
Business and government [member] | Investment grade [member] | Gross credit exposure [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 180,075 | 157,131
Business and government [member] | Non-investment grade [member] | Gross credit exposure [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 82,568 | 69,806
Business and government [member] | Watch list [member] | Gross credit exposure [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 1,103 | 906
Business and government [member] | Default [member] | Gross credit exposure [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 217 | 123
Business and government [member] | Not Rated [member] | Gross credit exposure [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 989 | 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 | 147 | 96
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 | 469,020 | 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 | 54 | 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 | 208,758 | 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 | 208,704 | 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 | 176,040 | 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 | 14,237 | 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 | 14,867 | 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 | 2,449 | 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 | 545 | 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 | 620 | 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 | 93 | 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 | 260,409 | 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 | 260,316 | 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 | 179,496 | 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 | 79,909 | 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 | 947 | 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 | 193 | 92
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 | 8,538 | 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 | 131 | 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 | 4,405 | 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 | 4,274 | 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 | 190 | 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 | 572 | 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 | 1,705 | 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 | 1,508 | 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 | 422 | 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 | 62 | 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 | 4,326 | 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 | 4,264 | 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 | 579 | 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 | 2,659 | 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 | 1,046 | 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 | 256 | 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 | 7 | 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 | 217 | 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 | 210 | 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 | 217 | 123
Stage 3 [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] |  |
Disclosure of internal credit grades [line items] |  |
ECL allowance | $ 7 | $ 9

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