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Loans - Summary of Allowance for Credit Losses (Detail) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 31, 2025
Apr. 30, 2025
Jul. 31, 2024
Jul. 31, 2025
Jul. 31, 2024
Oct. 31, 2024
Disclosure of detailed information about borrowings [line items]            
Balance at beginning of period $ 4,455          
Balance at end of period 4,588 $ 4,455 $ 4,118 $ 4,588 $ 4,118  
Loans 4,285 4,191 3,920 4,285 3,920 $ 3,917
Undrawn credit facilities and other off-balance sheet exposures 303 264 198 303 198  
Residential mortgages [member]            
Disclosure of detailed information about borrowings [line items]            
Balance at beginning of period 482 472 499 449 456  
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (19) (24) (16) (59) (35)  
Provision for (reversal of) credit losses changes in model         15  
Provision for (reversal of) credit losses net remeasurement 104 55 32 198 94  
Total provision for (reversal of) credit losses 85 31 16 139 74  
Write-offs (5) (2) (8) (9) (15)  
Recoveries 3   3 6 7  
Interest income on impaired loans (10) (9) (9) (27) (21)  
Foreign exchange and other   (10) 1 (3)    
Balance at end of period 555 482 502 555 502  
Personal [member]            
Disclosure of detailed information about borrowings [line items]            
Balance at beginning of period 1,095 1,095 1,095 983 1,064  
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (4) (12) (16) (21) (50)  
Provision for (reversal of) credit losses changes in model   26   82    
Provision for (reversal of) credit losses net remeasurement 195 121 137 496 428  
Total provision for (reversal of) credit losses 191 135 121 557 378  
Write-offs (146) (149) (146) (433) (404)  
Recoveries 19 24 15 60 47  
Interest income on impaired loans (2) (2) (2) (6) (5)  
Foreign exchange and other   (8) 1 (4) 4  
Balance at end of period 1,157 1,095 1,084 1,157 1,084  
Credit card [member]            
Disclosure of detailed information about borrowings [line items]            
Balance at beginning of period 993 960 792 955 772  
Provision for (reversal of) credit losses originations net of repayments and other derecognitions   (1) 3 4 (9)  
Provision for (reversal of) credit losses changes in model       6    
Provision for (reversal of) credit losses net remeasurement 161 218 211 542 522  
Total provision for (reversal of) credit losses 161 217 214 552 513  
Write-offs (232) (221) (198) (657) (535)  
Recoveries 41 37 33 113 91  
Balance at end of period 963 993 841 963 841  
Business and government [member]            
Disclosure of detailed information about borrowings [line items]            
Balance at beginning of period 1,885 1,849 1,700 1,727 1,825  
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (12) (28) (39) (69) (70)  
Provision for (reversal of) credit losses changes in model   3   3 41  
Provision for (reversal of) credit losses net remeasurement 134 247 171 555 646  
Total provision for (reversal of) credit losses 122 222 132 489 617  
Write-offs (94) (85) (142) (256) (749)  
Recoveries 13 3 18 30 67  
Interest income on impaired loans (22) (24) (20) (69) (64)  
Foreign exchange and other 9 (80) 3 (8) (5)  
Balance at end of period 1,913 1,885 1,691 1,913 1,691  
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 period 958          
Balance at end of period 1,111 958 774 1,111 774  
Loans 992 844 684 992 684  
Undrawn credit facilities and other off-balance sheet exposures 119 114 90 119 90  
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 period 92 91 92 89 90  
Provision for (reversal of) credit losses originations net of repayments and other derecognitions 4 3 3 11 11  
Provision for (reversal of) credit losses net remeasurement (24) (35) (41) (97) (79)  
Transfers to 12-month ECL 30 38 40 104 76  
Transfers to lifetime ECL performing (3) (2) (3) (7) (7)  
Total provision for (reversal of) credit losses 7 4 (1) 11 1  
Foreign exchange and other   (3)   (1)    
Balance at end of period 99 92 91 99 91  
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 period 242 228 175 247 174  
Provision for (reversal of) credit losses originations net of repayments and other derecognitions 14 9 8 30 23  
Provision for (reversal of) credit losses changes in model   5   (15)    
Provision for (reversal of) credit losses net remeasurement (112) (198) (133) (429) (398)  
Transfers to 12-month ECL 134 211 143 473 427  
Transfers to lifetime ECL performing (29) (10) (18) (54) (52)  
Transfers to lifetime ECL credit-impaired (1) (1)   (3)    
Total provision for (reversal of) credit losses 6 16   2    
Foreign exchange and other 5 (2) 4 4 5  
Balance at end of period 253 242 179 253 179  
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 period 291 277 184 295 181  
Provision for (reversal of) credit losses originations net of repayments and other derecognitions 9 9 5 28 17  
Provision for (reversal of) credit losses changes in model       (26)    
Provision for (reversal of) credit losses net remeasurement (145) (225) (72) (583) (260)  
Transfers to 12-month ECL 201 250 96 683 308  
Transfers to lifetime ECL performing (18) (19) (20) (58) (53)  
Transfers to lifetime ECL credit-impaired (1) (1)   (2)    
Total provision for (reversal of) credit losses 46 14 9 42 12  
Balance at end of period 337 291 193 337 193  
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 period 333 320 312 265 294  
Provision for (reversal of) credit losses originations net of repayments and other derecognitions 14 7 2 35 14  
Provision for (reversal of) credit losses changes in model 84 1   85 12  
Provision for (reversal of) credit losses net remeasurement (39) 3 (43) (44) (107)  
Transfers to 12-month ECL 39 30 55 116 139  
Transfers to lifetime ECL performing (9) (15) (9) (31) (31)  
Total provision for (reversal of) credit losses 89 26 5 161 27  
Foreign exchange and other   (13) (6) (4) (10)  
Balance at end of period 422 333 311 422 311  
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 period 2,584          
Balance at end of period 2,517 2,584 2,504 2,517 2,504  
Loans 2,341 2,443 2,407 2,341 2,407  
Undrawn credit facilities and other off-balance sheet exposures 176 141 97 176 97  
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 period 132 128 151 126 142  
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (4) (6) (5) (15) (11)  
Provision for (reversal of) credit losses changes in model         4  
Provision for (reversal of) credit losses net remeasurement 53 42 46 131 90  
Transfers to 12-month ECL (28) (35) (40) 98 (75)  
Transfers to lifetime ECL performing 8 6 4 21 10  
Transfers to lifetime ECL credit-impaired (2) (3) (2) (7) (6)  
Total provision for (reversal of) credit losses 27 4 3 32 12  
Foreign exchange and other (1)   (1)   (1)  
Balance at end of period 158 132 153 158 153  
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 period 647 680 724 546 709  
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (11) (14) (14) (30) (43)  
Provision for (reversal of) credit losses changes in model   21   97    
Provision for (reversal of) credit losses net remeasurement 200 171 149 558 487  
Transfers to 12-month ECL (133) (208) (142) (467) (426)  
Transfers to lifetime ECL performing 35 14 20 72 56  
Transfers to lifetime ECL credit-impaired (17) (17) (25) (53) (72)  
Total provision for (reversal of) credit losses 74 (33) (12) 177 2  
Foreign exchange and other (1)     (3) 1  
Balance at end of period 720 647 712 720 712  
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 period 702 683 608 660 591  
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (9) (10) (2) (24) (26)  
Provision for (reversal of) credit losses changes in model       32    
Provision for (reversal of) credit losses net remeasurement 213 351 172 828 498  
Transfers to 12-month ECL (201) (250) (96) (683) (308)  
Transfers to lifetime ECL performing 18 19 20 58 53  
Transfers to lifetime ECL credit-impaired (97) (91) (54) (245) (160)  
Total provision for (reversal of) credit losses (76) 19 40 (34) 57  
Balance at end of period 626 702 648 626 648  
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 period 1,103 1,057 953 1,061 864  
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (12) (23) (32) (57) (54)  
Provision for (reversal of) credit losses changes in model (84) 2   (82) 29  
Provision for (reversal of) credit losses net remeasurement 84 139 129 302 404  
Transfers to 12-month ECL (38) (29) (50) (112) (129)  
Transfers to lifetime ECL performing 11 16 11 36 36  
Transfers to lifetime ECL credit-impaired (56) (13) (23) (131) (158)  
Total provision for (reversal of) credit losses (95) 92 35 (44) 128  
Foreign exchange and other 5 (46) 3   (1)  
Balance at end of period 1,013 1,103 991 1,013 991  
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 period 913          
Balance at end of period 960 913 840 960 840  
Loans 952 904 829 952 829  
Undrawn credit facilities and other off-balance sheet exposures 8 9 11 8 11  
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 period 258 253 256 234 224  
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (19) (21) (14) (55) (35)  
Provision for (reversal of) credit losses changes in model         11  
Provision for (reversal of) credit losses net remeasurement 75 48 27 164 83  
Transfers to 12-month ECL (2) (3)   (6) (1)  
Transfers to lifetime ECL performing (5) (4) (1) (14) (3)  
Transfers to lifetime ECL credit-impaired 2 3 2 7 6  
Total provision for (reversal of) credit losses 51 23 14 96 61  
Write-offs (5) (2) (8) (9) (15)  
Recoveries 3   3 6 7  
Interest income on impaired loans (10) (9) (9) (27) (21)  
Foreign exchange and other 1 (7) 2 (2) 2  
Balance at end of period 298 258 258 298 258  
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 period 206 187 196 190 181  
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (7) (7) (10) (21) (30)  
Provision for (reversal of) credit losses net remeasurement 107 148 121 367 339  
Transfers to 12-month ECL (1) (3) (1) (6) (1)  
Transfers to lifetime ECL performing (6) (4) (2) (18) (4)  
Transfers to lifetime ECL credit-impaired 18 18 25 56 72  
Total provision for (reversal of) credit losses 111 152 133 378 376  
Write-offs (146) (149) (146) (433) (404)  
Recoveries 19 24 15 60 47  
Interest income on impaired loans (2) (2) (2) (6) (5)  
Foreign exchange and other (4) (6) (3) (5) (2)  
Balance at end of period 184 206 193 184 193  
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 93 92 111 297 284  
Transfers to lifetime ECL credit-impaired 98 92 54 247 160  
Total provision for (reversal of) credit losses 191 184 165 544 444  
Write-offs (232) (221) (198) (657) (535)  
Recoveries 41 37 33 113 91  
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 period 449 472 435 401 667  
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (14) (12) (9) (47) (30)  
Provision for (reversal of) credit losses net remeasurement 89 105 85 297 349  
Transfers to 12-month ECL (1) (1) (5) (4) (10)  
Transfers to lifetime ECL performing (2) (1) (2) (5) (5)  
Transfers to lifetime ECL credit-impaired 56 13 23 131 158  
Total provision for (reversal of) credit losses 128 104 92 372 462  
Write-offs (94) (85) (142) (256) (749)  
Recoveries 13 3 18 30 67  
Interest income on impaired loans (22) (24) (20) (69) (64)  
Foreign exchange and other 4 (21) 6   6  
Balance at end of period $ 478 $ 449 $ 389 $ 478 $ 389