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IFRS 7 - Disclosure - Liquidity Risk - Summary of Credit Related Commitments (Detail) - CAD ($) $ in Millions | Jan. 31, 2025 | Oct. 31, 2024
--- | --- | ---
Disclosure of commitments [line items] |  |
Credit related commitments | $ 445,742 | $ 440,411
Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 395,156 |
Standby and performance letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 23,898 |
Backstop liquidity facilities [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 25,709 |
Documentary and commercial letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 225 |
Other commitments to extend credit [Member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 754 |
Less than 1 month [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 8,012 | 18,455
Less than 1 month [member] | Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 1,911 |
Less than 1 month [member] | Standby and performance letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 5,372 |
Less than 1 month [member] | Backstop liquidity facilities [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 10 |
Less than 1 month [member] | Documentary and commercial letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 22 |
Less than 1 month [member] | Other commitments to extend credit [Member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 697 |
1 - 3 months [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 12,475 | 35,462
1 - 3 months [member] | Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 9,772 |
1 - 3 months [member] | Standby and performance letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 2,537 |
1 - 3 months [member] | Backstop liquidity facilities [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 50 |
1 - 3 months [member] | Documentary and commercial letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 116 |
3 - 6 months [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 11,587 | 8,910
3 - 6 months [member] | Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 6,599 |
3 - 6 months [member] | Standby and performance letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 4,632 |
3 - 6 months [member] | Backstop liquidity facilities [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 327 |
3 - 6 months [member] | Documentary and commercial letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 29 |
6 - 9 months [Member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 11,439 | 11,720
6 - 9 months [Member] | Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 7,604 |
6 - 9 months [Member] | Standby and performance letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 3,749 |
6 - 9 months [Member] | Backstop liquidity facilities [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 56 |
6 - 9 months [Member] | Documentary and commercial letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 30 |
9 - 12 months [Member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 37,135 | 12,084
9 - 12 months [Member] | Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 6,399 |
9 - 12 months [Member] | Standby and performance letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 6,084 |
9 - 12 months [Member] | Backstop liquidity facilities [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 24,642 |
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 | 24,791 | 26,766
1 - 2 years [member] | Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 23,826 |
1 - 2 years [member] | Standby and performance letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 604 |
1 - 2 years [member] | Backstop liquidity facilities [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 353 |
1 - 2 years [member] | Documentary and commercial letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 8 |
2 - 5 years [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 86,336 | 77,636
2 - 5 years [member] | Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 85,343 |
2 - 5 years [member] | Standby and performance letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 712 |
2 - 5 years [member] | Backstop liquidity facilities [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 271 |
2 - 5 years [member] | Documentary and commercial letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 10 |
Over 5 years [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 3,431 | 3,562
Over 5 years [member] | Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 3,223 |
Over 5 years [member] | Standby and performance letters of credit [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 208 |
No specific maturity [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 250,536 | $ 245,816
No specific maturity [member] | Unutilized credit commitments [member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | 250,479 |
No specific maturity [member] | Other commitments to extend credit [Member] |  |
Disclosure of commitments [line items] |  |
Credit related commitments | $ 57 |

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