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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
Apr. 30, 2025
Oct. 31, 2024
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets $ 536,339 $ 499,897
Encumbered liquid assets 278,314 234,751
Unencumbered liquid assets 258,025 265,146
Cash and deposits with banks [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 49,586 48,064
Encumbered liquid assets 482 560
Unencumbered liquid assets 49,104 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 306,406 286,823
Encumbered liquid assets 179,119 146,992
Unencumbered liquid assets 127,287 139,831
Other debt securities [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 19,881 17,421
Encumbered liquid assets 5,863 3,696
Unencumbered liquid assets 14,018 13,725
Equities [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 95,015 91,526
Encumbered liquid assets 59,146 54,269
Unencumbered liquid assets 35,869 37,257
Canadian government guaranteed National Housing Act mortgage-backed securities [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 37,695 37,193
Encumbered liquid assets 23,557 20,263
Unencumbered liquid assets 14,138 16,930
Other liquid assets [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 27,756 18,870
Encumbered liquid assets 10,147 8,971
Unencumbered liquid assets 17,609 9,899
Bank owned liquid assets [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 360,720 341,759
Bank owned liquid assets [member] | Cash and deposits with banks [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 49,586 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 186,105 178,324
Bank owned liquid assets [member] | Other debt securities [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 5,947 6,093
Bank owned liquid assets [member] | Equities [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 64,770 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 32,431 35,155
Bank owned liquid assets [member] | Other liquid assets [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 21,881 16,021
Securities received as collateral [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 175,619 158,138
Securities received as collateral [member] | Cash and deposits with banks [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 0  
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 120,301 108,499
Securities received as collateral [member] | Other debt securities [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 13,934 11,328
Securities received as collateral [member] | Equities [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets 30,245 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 5,264 2,038
Securities received as collateral [member] | Other liquid assets [member]    
Disclosure Of Encumbered and Unencumbered Assets [line items]    
Total liquid assets $ 5,875 $ 2,849