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IFRS 7 - Disclosure - Liquidity Risk - Summary of Contractual Maturities of Other Contractual Obligations Affecting Our Funding Needs (Detail) - CAD ($)
$ in Millions
Jan. 31, 2025
Oct. 31, 2024
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations $ 4,726 $ 4,552
Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 2,903  
Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 573  
Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 536  
Underwriting commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 590  
Pension contribution [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 124  
Less than 1 month [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 704 607
Less than 1 month [member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 97  
Less than 1 month [member] | Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 3  
Less than 1 month [member] | Underwriting commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 590  
Less than 1 month [member] | Pension contribution [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 14  
1 - 3 months [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 210 263
1 - 3 months [member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 173  
1 - 3 months [member] | Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 9  
1 - 3 months [member] | Pension contribution [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 28  
3 - 6 months [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 343 292
3 - 6 months [member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 302  
3 - 6 months [member] | Pension contribution [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 41  
6 - 9 months [Member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 299 321
6 - 9 months [Member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 254  
6 - 9 months [Member] | Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 2  
6 - 9 months [Member] | Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 2  
6 - 9 months [Member] | Pension contribution [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 41  
9 - 12 months [Member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 252 279
9 - 12 months [Member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 246  
9 - 12 months [Member] | Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 5  
9 - 12 months [Member] | Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 1  
1 - 2 years [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 759 737
1 - 2 years [member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 730  
1 - 2 years [member] | Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 28  
1 - 2 years [member] | Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 1  
2 - 5 years [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 961 850
2 - 5 years [member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 819  
2 - 5 years [member] | Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 97  
2 - 5 years [member] | Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 45  
Over 5 years [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 1,198 $ 1,203
Over 5 years [member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 282  
Over 5 years [member] | Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 441  
Over 5 years [member] | Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations $ 475