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IFRS 7 Disclosure (Summary of Liquid Assets by Type and Currency) (Details) - CAD ($)
$ in Millions
Apr. 30, 2024
Oct. 31, 2023
Disclosure Of Liquid Assets By Type And Currency [Line Items]    
Bank-owned liquid assets $ 571,152 $ 561,580
Securities received as collateral from securities financing and derivative transactions 287,424 306,458
Total liquid assets 858,576 868,038
Encumbered liquid assets 328,364 326,374
Unencumbered liquid assets 530,212 541,664
Canadian Dollar [member]    
Disclosure Of Liquid Assets By Type And Currency [Line Items]    
Bank-owned liquid assets 163,886 153,281
Securities received as collateral from securities financing and derivative transactions 123,563 123,806
Total liquid assets 287,449 277,087
Encumbered liquid assets 109,344 113,486
Unencumbered liquid assets 178,105 163,601
Other than Canadian dollar [member]    
Disclosure Of Liquid Assets By Type And Currency [Line Items]    
Bank-owned liquid assets 407,266 408,299
Securities received as collateral from securities financing and derivative transactions 163,861 182,652
Total liquid assets 571,127 590,951
Encumbered liquid assets 219,020 212,888
Unencumbered liquid assets 352,107 378,063
Equities [member] | Canadian Dollar [member]    
Disclosure Of Liquid Assets By Type And Currency [Line Items]    
Bank-owned liquid assets 11,643 10,555
Securities received as collateral from securities financing and derivative transactions 2,987 2,288
Total liquid assets 14,630 12,843
Encumbered liquid assets 13,637 8,890
Unencumbered liquid assets 993 3,953
Equities [member] | Other than Canadian dollar [member]    
Disclosure Of Liquid Assets By Type And Currency [Line Items]    
Bank-owned liquid assets 52,202 38,501
Securities received as collateral from securities financing and derivative transactions 36,828 38,388
Total liquid assets 89,030 76,889
Encumbered liquid assets 49,879 47,653
Unencumbered liquid assets 39,151 29,236
U.S. government obligations [member] | Other than Canadian dollar [member]    
Disclosure Of Liquid Assets By Type And Currency [Line Items]    
Bank-owned liquid assets 73,624 72,808
Securities received as collateral from securities financing and derivative transactions 62,310 64,449
Total liquid assets 135,934 137,257
Encumbered liquid assets 75,498 63,688
Unencumbered liquid assets 60,436 73,569
Corporate issuer obligations [member] | Canadian Dollar [member]    
Disclosure Of Liquid Assets By Type And Currency [Line Items]    
Bank-owned liquid assets 21,088 19,507
Securities received as collateral from securities financing and derivative transactions 5,672 4,815
Total liquid assets 26,760 24,322
Encumbered liquid assets 5,662 4,512
Unencumbered liquid assets 21,098 19,810
Corporate issuer obligations [member] | Other than Canadian dollar [member]    
Disclosure Of Liquid Assets By Type And Currency [Line Items]    
Bank-owned liquid assets 78,482 84,853
Securities received as collateral from securities financing and derivative transactions 14,856 9,656
Total liquid assets 93,338 94,509
Encumbered liquid assets 26,992 15,228
Unencumbered liquid assets 66,346 79,281
Cash and central bank reserves [member] | Canadian Dollar [member]    
Disclosure Of Liquid Assets By Type And Currency [Line Items]    
Bank-owned liquid assets 25,184 28,548
Securities received as collateral from securities financing and derivative transactions 0 0
Total liquid assets 25,184 28,548
Encumbered liquid assets 737 506
Unencumbered liquid assets 24,447 28,042
Cash and central bank reserves [member] | Other than Canadian dollar [member]    
Disclosure Of Liquid Assets By Type And Currency [Line Items]    
Bank-owned liquid assets 58,173 66,094
Securities received as collateral from securities financing and derivative transactions 0 0
Total liquid assets 58,173 66,094
Encumbered liquid assets 255 180
Unencumbered liquid assets 57,918 65,914
Canadian government obligations [member] | Canadian Dollar [member]    
Disclosure Of Liquid Assets By Type And Currency [Line Items]    
Bank-owned liquid assets 23,108 15,214
Securities received as collateral from securities financing and derivative transactions 89,065 94,000
Total liquid assets 112,173 109,214
Encumbered liquid assets 51,323 67,457
Unencumbered liquid assets 60,850 41,757
National Housing Act mortgage backed securities [member] | Canadian Dollar [member]    
Disclosure Of Liquid Assets By Type And Currency [Line Items]    
Bank-owned liquid assets 41,366 38,760
Securities received as collateral from securities financing and derivative transactions 0 0
Total liquid assets 41,366 38,760
Encumbered liquid assets 1,393 1,043
Unencumbered liquid assets 39,973 37,717
Provincial government obligations [member] | Canadian Dollar [member]    
Disclosure Of Liquid Assets By Type And Currency [Line Items]    
Bank-owned liquid assets 41,497 40,697
Securities received as collateral from securities financing and derivative transactions 25,839 22,703
Total liquid assets 67,336 63,400
Encumbered liquid assets 36,592 31,078
Unencumbered liquid assets 30,744 32,322
U.S. federal agency obligations [member] | Other than Canadian dollar [member]    
Disclosure Of Liquid Assets By Type And Currency [Line Items]    
Bank-owned liquid assets 79,327 80,047
Securities received as collateral from securities financing and derivative transactions 12,748 15,838
Total liquid assets 92,075 95,885
Encumbered liquid assets 27,419 29,487
Unencumbered liquid assets 64,656 66,398
Other sovereign obligations [member] | Other than Canadian dollar [member]    
Disclosure Of Liquid Assets By Type And Currency [Line Items]    
Bank-owned liquid assets 65,458 65,996
Securities received as collateral from securities financing and derivative transactions 37,119 54,321
Total liquid assets 102,577 120,317
Encumbered liquid assets 38,977 56,652
Unencumbered liquid assets $ 63,600 $ 63,665