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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
Apr. 30, 2025
Oct. 31, 2024
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations $ 4,446 $ 4,552
Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 2,717  
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 559  
Underwriting commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 514  
Pension contribution [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 83  
Less than 1 month [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 646 607
Less than 1 month [member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 118  
Less than 1 month [member] | Underwriting commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 514  
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 240 263
1 - 3 months [member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 212  
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 311 292
3 - 6 months [member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 267  
3 - 6 months [member] | Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 2  
3 - 6 months [member] | Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 1  
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 281 321
6 - 9 months [Member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 275  
6 - 9 months [Member] | Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 5  
6 - 9 months [Member] | Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 1  
9 - 12 months [Member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 225 279
9 - 12 months [Member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 207  
9 - 12 months [Member] | Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 6  
9 - 12 months [Member] | Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 12  
1 - 2 years [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 684 737
1 - 2 years [member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 643  
1 - 2 years [member] | Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 31  
1 - 2 years [member] | Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 10  
2 - 5 years [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 882 850
2 - 5 years [member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 740  
2 - 5 years [member] | Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 95  
2 - 5 years [member] | Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 47  
Over 5 years [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 1,177 $ 1,203
Over 5 years [member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 255  
Over 5 years [member] | Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 434  
Over 5 years [member] | Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations $ 488