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IFRS 7 - Disclosure - Liquidity Risk - Summary of Credit Related Commitments (Detail) - CAD ($) $ in Millions | Apr. 30, 2025 | Oct. 31, 2024
--- | --- | ---
Disclosure of commitments [line items] |  |
Credit related commitments | $ 450,627 | $ 440,411
Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 398,661 |
Standby and performance letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 23,759 |
Backstop liquidity facilities [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 26,671 |
Documentary and commercial letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 190 |
Other commitments to extend credit [Member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 1,346 |
Less than 1 month [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 9,710 | 18,455
Less than 1 month [member] | Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 2,895 |
Less than 1 month [member] | Standby and performance letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 5,318 |
Less than 1 month [member] | Backstop liquidity facilities [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 157 |
Less than 1 month [member] | Documentary and commercial letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 48 |
Less than 1 month [member] | Other commitments to extend credit [Member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 1,292 |
1 - 3 months [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 13,715 | 35,462
1 - 3 months [member] | Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 9,807 |
1 - 3 months [member] | Standby and performance letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 3,645 |
1 - 3 months [member] | Backstop liquidity facilities [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 216 |
1 - 3 months [member] | Documentary and commercial letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 47 |
3 - 6 months [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 10,542 | 8,910
3 - 6 months [member] | Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 6,618 |
3 - 6 months [member] | Standby and performance letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 3,608 |
3 - 6 months [member] | Backstop liquidity facilities [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 259 |
3 - 6 months [member] | Documentary and commercial letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 57 |
6 - 9 months [Member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 36,710 | 11,720
6 - 9 months [Member] | Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 5,400 |
6 - 9 months [Member] | Standby and performance letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 5,827 |
6 - 9 months [Member] | Backstop liquidity facilities [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 25,469 |
6 - 9 months [Member] | Documentary and commercial letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 14 |
9 - 12 months [Member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 11,606 | 12,084
9 - 12 months [Member] | Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 7,503 |
9 - 12 months [Member] | Standby and performance letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 3,886 |
9 - 12 months [Member] | Backstop liquidity facilities [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 207 |
9 - 12 months [Member] | Documentary and commercial letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 10 |
1 - 2 years [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 24,886 | 26,766
1 - 2 years [member] | Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 24,263 |
1 - 2 years [member] | Standby and performance letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 503 |
1 - 2 years [member] | Backstop liquidity facilities [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 120 |
2 - 5 years [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 86,516 | 77,636
2 - 5 years [member] | Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 85,476 |
2 - 5 years [member] | Standby and performance letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 783 |
2 - 5 years [member] | Backstop liquidity facilities [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 243 |
2 - 5 years [member] | Documentary and commercial letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 14 |
Over 5 years [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 3,733 | 3,562
Over 5 years [member] | Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 3,544 |
Over 5 years [member] | Standby and performance letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 189 |
No specific maturity [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 253,209 | $ 245,816
No specific maturity [member] | Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 253,155 |
No specific maturity [member] | Other commitments to extend credit [Member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | $ 54 |

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