Loans, Impaired Loans and Allowance for Credit Losses - Allowance For Credit Losses (Parenthetical) (Detail) - CAD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
Apr. 30, 2026 |
Jan. 31, 2026 |
Apr. 30, 2025 |
Apr. 30, 2026 |
Apr. 30, 2025 |
Oct. 31, 2025 |
|
| Disclosure of detailed information about financial instruments [line items] | ||||||
| Provision for credit losses | $ 1,217 | $ 1,176 | $ 1,398 | $ 2,393 | $ 2,560 | |
| Allowance for credit losses for other financial assets | $ 194 | $ 192 | 194 | 192 | $ 191 | |
| Other Assets And Reversal of Impairment Loss [Member] | ||||||
| Disclosure of detailed information about financial instruments [line items] | ||||||
| Reversal of impairment loss | (5) | (18) | ||||
| Residential mortgages personal loans credit cards total retail loans business and government excluding other assets [member] | ||||||
| Disclosure of detailed information about financial instruments [line items] | ||||||
| Provision for credit losses | $ 2,393 | $ 2,560 | ||||