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IFRS 7 - Disclosure - Liquidity Risk - Summary of Credit Related Commitments (Detail) - CAD ($)
$ in Millions
Jul. 31, 2025
Oct. 31, 2024
Disclosure of commitments [line items]    
Credit related commitments $ 467,934 $ 440,411
Unutilized credit commitments [member]    
Disclosure of commitments [line items]    
Credit related commitments 411,684  
Standby and performance letters of credit [member]    
Disclosure of commitments [line items]    
Credit related commitments 24,895  
Backstop liquidity facilities [member]    
Disclosure of commitments [line items]    
Credit related commitments 29,472  
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 1,693  
Less than 1 month [member]    
Disclosure of commitments [line items]    
Credit related commitments 10,325 18,455
Less than 1 month [member] | Unutilized credit commitments [member]    
Disclosure of commitments [line items]    
Credit related commitments 2,641  
Less than 1 month [member] | Standby and performance letters of credit [member]    
Disclosure of commitments [line items]    
Credit related commitments 6,023  
Less than 1 month [member] | Documentary and commercial letters of credit [member]    
Disclosure of commitments [line items]    
Credit related commitments 24  
Less than 1 month [member] | Other commitments to extend credit [Member]    
Disclosure of commitments [line items]    
Credit related commitments 1,637  
1 - 3 months [member]    
Disclosure of commitments [line items]    
Credit related commitments 14,153 35,462
1 - 3 months [member] | Unutilized credit commitments [member]    
Disclosure of commitments [line items]    
Credit related commitments 10,815  
1 - 3 months [member] | Standby and performance letters of credit [member]    
Disclosure of commitments [line items]    
Credit related commitments 3,042  
1 - 3 months [member] | Backstop liquidity facilities [member]    
Disclosure of commitments [line items]    
Credit related commitments 198  
1 - 3 months [member] | Documentary and commercial letters of credit [member]    
Disclosure of commitments [line items]    
Credit related commitments 98  
3 - 6 months [member]    
Disclosure of commitments [line items]    
Credit related commitments 39,014 8,910
3 - 6 months [member] | Unutilized credit commitments [member]    
Disclosure of commitments [line items]    
Credit related commitments 4,839  
3 - 6 months [member] | Standby and performance letters of credit [member]    
Disclosure of commitments [line items]    
Credit related commitments 5,455  
3 - 6 months [member] | Backstop liquidity facilities [member]    
Disclosure of commitments [line items]    
Credit related commitments 28,680  
3 - 6 months [member] | Documentary and commercial letters of credit [member]    
Disclosure of commitments [line items]    
Credit related commitments 40  
6 - 9 months [Member]    
Disclosure of commitments [line items]    
Credit related commitments 10,771 11,720
6 - 9 months [Member] | Unutilized credit commitments [member]    
Disclosure of commitments [line items]    
Credit related commitments 6,644  
6 - 9 months [Member] | Standby and performance letters of credit [member]    
Disclosure of commitments [line items]    
Credit related commitments 4,066  
6 - 9 months [Member] | Backstop liquidity facilities [member]    
Disclosure of commitments [line items]    
Credit related commitments 57  
6 - 9 months [Member] | Documentary and commercial letters of credit [member]    
Disclosure of commitments [line items]    
Credit related commitments 4  
9 - 12 months [Member]    
Disclosure of commitments [line items]    
Credit related commitments 13,748 12,084
9 - 12 months [Member] | Unutilized credit commitments [member]    
Disclosure of commitments [line items]    
Credit related commitments 8,867  
9 - 12 months [Member] | Standby and performance letters of credit [member]    
Disclosure of commitments [line items]    
Credit related commitments 4,745  
9 - 12 months [Member] | Backstop liquidity facilities [member]    
Disclosure of commitments [line items]    
Credit related commitments 132  
9 - 12 months [Member] | Documentary and commercial letters of credit [member]    
Disclosure of commitments [line items]    
Credit related commitments 4  
1 - 2 years [member]    
Disclosure of commitments [line items]    
Credit related commitments 26,175 26,766
1 - 2 years [member] | Unutilized credit commitments [member]    
Disclosure of commitments [line items]    
Credit related commitments 25,194  
1 - 2 years [member] | Standby and performance letters of credit [member]    
Disclosure of commitments [line items]    
Credit related commitments 576  
1 - 2 years [member] | Backstop liquidity facilities [member]    
Disclosure of commitments [line items]    
Credit related commitments 405  
2 - 5 years [member]    
Disclosure of commitments [line items]    
Credit related commitments 90,201 77,636
2 - 5 years [member] | Unutilized credit commitments [member]    
Disclosure of commitments [line items]    
Credit related commitments 89,379  
2 - 5 years [member] | Standby and performance letters of credit [member]    
Disclosure of commitments [line items]    
Credit related commitments 802  
2 - 5 years [member] | Documentary and commercial letters of credit [member]    
Disclosure of commitments [line items]    
Credit related commitments 20  
Over 5 years [member]    
Disclosure of commitments [line items]    
Credit related commitments 5,507 3,562
Over 5 years [member] | Unutilized credit commitments [member]    
Disclosure of commitments [line items]    
Credit related commitments 5,321  
Over 5 years [member] | Standby and performance letters of credit [member]    
Disclosure of commitments [line items]    
Credit related commitments 186  
No specific maturity [member]    
Disclosure of commitments [line items]    
Credit related commitments 258,040 $ 245,816
No specific maturity [member] | Unutilized credit commitments [member]    
Disclosure of commitments [line items]    
Credit related commitments 257,984  
No specific maturity [member] | Other commitments to extend credit [Member]    
Disclosure of commitments [line items]    
Credit related commitments $ 56