Loans, Impaired Loans and Allowance for Credit Losses - Allowance For Credit Losses (Parenthetical) (Detail) - CAD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|
Jul. 31, 2026 |
Apr. 30, 2026 |
Jul. 31, 2025 |
Jul. 31, 2026 |
Jul. 31, 2025 |
Oct. 31, 2025 |
|
| Disclosure of detailed information about financial instruments [line items] | ||||||
| Provision for credit losses | $ 1,079 | $ 1,217 | $ 1,041 | $ 3,472 | $ 3,601 | |
| Allowance for credit losses for other financial assets | $ 222 | $ 189 | 222 | 189 | $ 191 | |
| Other Assets And Reversal of Impairment Loss [Member] | ||||||
| Disclosure of detailed information about financial instruments [line items] | ||||||
| Reversal of impairment loss | 6 | (14) | ||||
| 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 | $ 3,472 | $ 3,601 | ||||