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IFRS 7 - Disclosure - Liquidity Risk - Summary of Encumbered and Unencumbered Assets from On- and Off-Balance Sheet Sources (Detail) - CAD ($)
$ in Millions
Jul. 31, 2025
Oct. 31, 2024
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets $ 542,623 $ 499,897
Encumbered liquid assets 293,037 234,751
Unencumbered liquid assets 249,586 265,146
Cash and deposits with banks [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 55,187 48,064
Encumbered liquid assets 282 560
Unencumbered liquid assets 54,905 47,504
Securities issued or guaranteed by sovereigns, central banks, and multilateral development banks [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 302,289 286,823
Encumbered liquid assets 187,527 146,992
Unencumbered liquid assets 114,762 139,831
Other debt securities [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 20,185 17,421
Encumbered liquid assets 9,103 3,696
Unencumbered liquid assets 11,082 13,725
Equities [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 106,501 91,526
Encumbered liquid assets 65,016 54,269
Unencumbered liquid assets 41,485 37,257
Canadian government guaranteed National Housing Act mortgage-backed securities [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 35,107 37,193
Encumbered liquid assets 22,990 20,263
Unencumbered liquid assets 12,117 16,930
Other liquid assets [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 23,354 18,870
Encumbered liquid assets 8,119 8,971
Unencumbered liquid assets 15,235 9,899
Bank owned liquid assets [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 366,621 341,759
Bank owned liquid assets [member] | Cash and deposits with banks [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 55,187 48,064
Bank owned liquid assets [member] | Securities issued or guaranteed by sovereigns, central banks, and multilateral development banks [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 184,041 178,324
Bank owned liquid assets [member] | Other debt securities [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 6,934 6,093
Bank owned liquid assets [member] | Equities [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 70,459 58,102
Bank owned liquid assets [member] | Canadian government guaranteed National Housing Act mortgage-backed securities [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 31,334 35,155
Bank owned liquid assets [member] | Other liquid assets [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 18,666 16,021
Securities received as collateral [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 176,002 158,138
Securities received as collateral [member] | Securities issued or guaranteed by sovereigns, central banks, and multilateral development banks [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 118,248 108,499
Securities received as collateral [member] | Other debt securities [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 13,251 11,328
Securities received as collateral [member] | Equities [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 36,042 33,424
Securities received as collateral [member] | Canadian government guaranteed National Housing Act mortgage-backed securities [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 3,773 2,038
Securities received as collateral [member] | Other liquid assets [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets $ 4,688 $ 2,849