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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
Jul. 31, 2025
Oct. 31, 2024
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations $ 4,171 $ 4,552
Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 2,713  
Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 572  
Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 533  
Underwriting commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 311  
Pension contribution [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 42  
Less than 1 month [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 435 607
Less than 1 month [member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 110  
Less than 1 month [member] | Underwriting commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 311  
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 250 263
1 - 3 months [member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 220  
1 - 3 months [member] | Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 1  
1 - 3 months [member] | Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 1  
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 318 292
3 - 6 months [member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 312  
3 - 6 months [member] | Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 5  
3 - 6 months [member] | Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 1  
6 - 9 months [Member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 254 321
6 - 9 months [Member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 236  
6 - 9 months [Member] | Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 6  
6 - 9 months [Member] | Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 12  
9 - 12 months [Member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 244 279
9 - 12 months [Member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 238  
9 - 12 months [Member] | Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 6  
1 - 2 years [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 640 737
1 - 2 years [member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 597  
1 - 2 years [member] | Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 33  
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 889 850
2 - 5 years [member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 746  
2 - 5 years [member] | Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 94  
2 - 5 years [member] | Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 49  
Over 5 years [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 1,141 $ 1,203
Over 5 years [member] | Purchase obligations [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 254  
Over 5 years [member] | Future lease commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations 427  
Over 5 years [member] | Investment commitments [member]    
Disclosure Of Other Contractual Obligations [line items]    
Contractual obligations $ 460