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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