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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