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Loans - Summary of Allowance for Credit Losses (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year $ 4,114  
Balance at end of year 4,739 $ 4,114
Loans 4,392 3,917
Undrawn credit facilities and other off-balance sheet exposures 347 197
Residential mortgages [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year 449 456
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (81) (59)
Provision for (reversal of) credit losses changes in model   15
Provision for (reversal of) credit losses net remeasurement 251 76
Total provision for (reversal of) credit losses 170 32
Write-offs (12) (18)
Recoveries 6 7
Interest income on impaired loans (36) (30)
Foreign exchange and other (3) 2
Balance at end of year 574 449
Personal [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year 983 1,064
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (30) (68)
Provision for (reversal of) credit losses changes in model 82 (79)
Provision for (reversal of) credit losses net remeasurement 704 553
Total provision for (reversal of) credit losses 756 406
Write-offs (571) (545)
Recoveries 74 62
Interest income on impaired loans (8) (7)
Foreign exchange and other 1 3
Balance at end of year 1,235 983
Credit card [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year 955 772
Provision for (reversal of) credit losses originations net of repayments and other derecognitions 3 (8)
Provision for (reversal of) credit losses changes in model 6 52
Provision for (reversal of) credit losses net remeasurement 816 752
Total provision for (reversal of) credit losses 825 796
Write-offs (884) (739)
Recoveries 152 126
Balance at end of year 1,048 955
Business and government [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year 1,727 1,825
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (119) (108)
Provision for (reversal of) credit losses changes in model (6) 18
Provision for (reversal of) credit losses net remeasurement 716 857
Total provision for (reversal of) credit losses 591 767
Write-offs (409) (874)
Recoveries 54 77
Interest income on impaired loans (94) (84)
Foreign exchange and other 13 16
Balance at end of year 1,882 1,727
Stage 1 [member] | 12-month expected credit losses [member] | Financial instruments not credit-impaired [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year 896  
Balance at end of year 1,130 896
Loans 983 800
Undrawn credit facilities and other off-balance sheet exposures 147 96
Stage 1 [member] | Residential mortgages [member] | 12-month expected credit losses [member] | Financial instruments not credit-impaired [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year 89 90
Provision for (reversal of) credit losses originations net of repayments and other derecognitions 15 15
Provision for (reversal of) credit losses net remeasurement (134) (115)
Transfers to 12-month ECL 141 109
Transfers to lifetime ECL performing (10) (10)
Total provision for (reversal of) credit losses 12 (1)
Foreign exchange and other (1)  
Balance at end of year 100 89
Stage 1 [member] | Personal [member] | 12-month expected credit losses [member] | Financial instruments not credit-impaired [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year 247 174
Provision for (reversal of) credit losses originations net of repayments and other derecognitions 40 32
Provision for (reversal of) credit losses changes in model (15) 54
Provision for (reversal of) credit losses net remeasurement (575) (544)
Transfers to 12-month ECL 623 591
Transfers to lifetime ECL performing (68) (63)
Transfers to lifetime ECL credit-impaired (4)  
Total provision for (reversal of) credit losses 1 70
Foreign exchange and other (1) 3
Balance at end of year 247 247
Stage 1 [member] | Credit card [member] | 12-month expected credit losses [member] | Financial instruments not credit-impaired [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year 295 181
Provision for (reversal of) credit losses originations net of repayments and other derecognitions 36 22
Provision for (reversal of) credit losses changes in model (26) 86
Provision for (reversal of) credit losses net remeasurement (740) (413)
Transfers to 12-month ECL 846 491
Transfers to lifetime ECL performing (77) (72)
Transfers to lifetime ECL credit-impaired (3)  
Total provision for (reversal of) credit losses 36 114
Balance at end of year 331 295
Stage 1 [member] | Business and government [member] | 12-month expected credit losses [member] | Financial instruments not credit-impaired [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year 265 294
Provision for (reversal of) credit losses originations net of repayments and other derecognitions 52 22
Provision for (reversal of) credit losses changes in model 79 (28)
Provision for (reversal of) credit losses net remeasurement (63) (194)
Transfers to 12-month ECL 162 215
Transfers to lifetime ECL performing (48) (39)
Total provision for (reversal of) credit losses 182 (24)
Foreign exchange and other 5 (5)
Balance at end of year 452 265
Stage 2 [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year 2,393  
Balance at end of year 2,620 2,393
Loans 2,427 2,301
Undrawn credit facilities and other off-balance sheet exposures 193 92
Stage 2 [member] | Residential mortgages [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year 126 142
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (23) (19)
Provision for (reversal of) credit losses changes in model   4
Provision for (reversal of) credit losses net remeasurement 176 96
Transfers to 12-month ECL (133) (107)
Transfers to lifetime ECL performing 31 19
Transfers to lifetime ECL credit-impaired (9) (8)
Total provision for (reversal of) credit losses 42 (15)
Foreign exchange and other   (1)
Balance at end of year 168 126
Stage 2 [member] | Personal [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year 546 709
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (45) (58)
Provision for (reversal of) credit losses changes in model 97 (127)
Provision for (reversal of) credit losses net remeasurement 795 631
Transfers to 12-month ECL (616) (588)
Transfers to lifetime ECL performing 90 74
Transfers to lifetime ECL credit-impaired (70) (96)
Total provision for (reversal of) credit losses 251 (164)
Foreign exchange and other 6 1
Balance at end of year 803 546
Stage 2 [member] | Credit card [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year 660 591
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (33) (30)
Provision for (reversal of) credit losses changes in model 32 (34)
Provision for (reversal of) credit losses net remeasurement 1,165 771
Transfers to 12-month ECL (846) (491)
Transfers to lifetime ECL performing 77 72
Transfers to lifetime ECL credit-impaired (338) (219)
Total provision for (reversal of) credit losses 57 69
Balance at end of year 717 660
Stage 2 [member] | Business and government [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year 1,061 864
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (105) (82)
Provision for (reversal of) credit losses changes in model (81) 46
Provision for (reversal of) credit losses net remeasurement 340 569
Transfers to 12-month ECL (158) (201)
Transfers to lifetime ECL performing 55 47
Transfers to lifetime ECL credit-impaired (177) (187)
Total provision for (reversal of) credit losses (126) 192
Foreign exchange and other (3) 5
Balance at end of year 932 1,061
Stage 3 [member] | Financial instruments credit-impaired [member]    
Disclosure of detailed information about borrowings [line items]    
Loans 982 816
Stage 3 [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year 825  
Balance at end of year 989 825
Loans 982 816
Undrawn credit facilities and other off-balance sheet exposures 7 9
Stage 3 [member] | Residential mortgages [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year 234 224
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (73) (55)
Provision for (reversal of) credit losses changes in model   11
Provision for (reversal of) credit losses net remeasurement 209 95
Transfers to 12-month ECL (8) (2)
Transfers to lifetime ECL performing (21) (9)
Transfers to lifetime ECL credit-impaired 9 8
Total provision for (reversal of) credit losses 116 48
Write-offs (12) (18)
Recoveries 6 7
Interest income on impaired loans (36) (30)
Foreign exchange and other (2) 3
Balance at end of year 306 234
Stage 3 [member] | Personal [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year 190 181
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (25) (42)
Provision for (reversal of) credit losses changes in model   (6)
Provision for (reversal of) credit losses net remeasurement 484 466
Transfers to 12-month ECL (7) (3)
Transfers to lifetime ECL performing (22) (11)
Transfers to lifetime ECL credit-impaired 74 96
Total provision for (reversal of) credit losses 504 500
Write-offs (571) (545)
Recoveries 74 62
Interest income on impaired loans (8) (7)
Foreign exchange and other (4) (1)
Balance at end of year 185 190
Stage 3 [member] | Credit card [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]    
Disclosure of detailed information about borrowings [line items]    
Provision for (reversal of) credit losses net remeasurement 391 394
Transfers to lifetime ECL credit-impaired 341 219
Total provision for (reversal of) credit losses 732 613
Write-offs (884) (739)
Recoveries 152 126
Stage 3 [member] | Business and government [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at beginning of year 401 667
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (66) (48)
Provision for (reversal of) credit losses changes in model (4)  
Provision for (reversal of) credit losses net remeasurement 439 482
Transfers to 12-month ECL (4) (14)
Transfers to lifetime ECL performing (7) (8)
Transfers to lifetime ECL credit-impaired 177 187
Total provision for (reversal of) credit losses 535 599
Write-offs (409) (874)
Recoveries 54 77
Interest income on impaired loans (94) (84)
Foreign exchange and other 11 16
Balance at end of year $ 498 $ 401