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Loans - Summary of Allowance for Credit Losses (Detail) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2025
Jan. 31, 2025
Oct. 31, 2024
Apr. 30, 2024
Apr. 30, 2025
Apr. 30, 2024
Disclosure of detailed information about borrowings [line items]            
Balance at beginning of period $ 4,376 $ 4,455     $ 4,455  
Balance at end of period 4,455 4,376 $ 4,455 $ 4,086 4,455 $ 4,086
Loans 4,191 4,104 3,917 3,898 4,191 3,898
Undrawn credit facilities and other off-balance sheet exposures 264 272   188 264 188
Residential mortgages [member]            
Disclosure of detailed information about borrowings [line items]            
Balance at beginning of period 472 449   503 449 456
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (24) (16)   (12) (40) (19)
Provision for (reversal of) credit losses changes in model       15   15
Provision for (reversal of) credit losses net remeasurement 55 39   1 94 62
Total provision for (reversal of) credit losses 31 23   4 54 58
Write-offs (2) (2)   (4) (4) (7)
Recoveries   3     3 4
Interest income on impaired loans (9) (8)   (6) (17) (12)
Foreign exchange and other (10) 7   2 (3)  
Balance at end of period 482 472 449 499 482 499
Personal [member]            
Disclosure of detailed information about borrowings [line items]            
Balance at beginning of period 1,095 983   1,098 983 1,064
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (12) (5)   (17) (17) (34)
Provision for (reversal of) credit losses changes in model 26 56     82  
Provision for (reversal of) credit losses net remeasurement 121 180   128 301 291
Total provision for (reversal of) credit losses 135 231   111 366 257
Write-offs (149) (138)   (132) (287) (258)
Recoveries 24 17   15 41 32
Interest income on impaired loans (2) (2)   (2) (4) (3)
Foreign exchange and other (8) 4   5 (4) 3
Balance at end of period 1,095 1,095 983 1,095 1,095 1,095
Credit card [member]            
Disclosure of detailed information about borrowings [line items]            
Balance at beginning of period 960 955   774 955 772
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (1) 5   1 4 (12)
Provision for (reversal of) credit losses changes in model   6     6  
Provision for (reversal of) credit losses net remeasurement 218 163   163 381 311
Total provision for (reversal of) credit losses 217 174   164 391 299
Write-offs (221) (204)   (177) (425) (337)
Recoveries 37 35   31 72 58
Balance at end of period 993 960 955 792 993 792
Business and government [member]            
Disclosure of detailed information about borrowings [line items]            
Balance at beginning of period 1,849 1,727   1,807 1,727 1,825
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (28) (29)   (3) (57) (31)
Provision for (reversal of) credit losses changes in model 3       3 41
Provision for (reversal of) credit losses net remeasurement 247 174   238 421 475
Total provision for (reversal of) credit losses 222 145   235 367 485
Write-offs (85) (77)   (385) (162) (607)
Recoveries 3 14   31 17 49
Interest income on impaired loans (24) (23)   (21) (47) (44)
Foreign exchange and other (80) 63   33 (17) (8)
Balance at end of period 1,885 1,849 1,727 1,700 1,885 1,700
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 916          
Balance at end of period 958 916   763 958 763
Loans 844 805   667 844 667
Undrawn credit facilities and other off-balance sheet exposures 114 111   96 114 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 period 91 89   88 89 90
Provision for (reversal of) credit losses originations net of repayments and other derecognitions 3 4   4 7 8
Provision for (reversal of) credit losses net remeasurement (35) (38)   (18) (73) (38)
Transfers to 12-month ECL 38 36   19 74 36
Transfers to lifetime ECL performing (2) (2)   (2) (4) (4)
Total provision for (reversal of) credit losses 4     3 4 2
Foreign exchange and other (3) 2   1 (1)  
Balance at end of period 92 91 89 92 92 92
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 228 247   176 247 174
Provision for (reversal of) credit losses originations net of repayments and other derecognitions 9 7   7 16 15
Provision for (reversal of) credit losses changes in model 5 (20)     (15)  
Provision for (reversal of) credit losses net remeasurement (198) (119)   (137) (317) (265)
Transfers to 12-month ECL 211 128   144 339 284
Transfers to lifetime ECL performing (10) (15)   (16) (25) (34)
Transfers to lifetime ECL credit-impaired (1) (1)     (2)  
Total provision for (reversal of) credit losses 16 (20)   (2) (4)  
Foreign exchange and other (2) 1   1 (1) 1
Balance at end of period 242 228 247 175 242 175
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 277 295   194 295 181
Provision for (reversal of) credit losses originations net of repayments and other derecognitions 9 10   6 19 12
Provision for (reversal of) credit losses changes in model   (26)     (26)  
Provision for (reversal of) credit losses net remeasurement (225) (213)   (94) (438) (188)
Transfers to 12-month ECL 250 232   93 482 212
Transfers to lifetime ECL performing (19) (21)   (15) (40) (33)
Transfers to lifetime ECL credit-impaired (1)       (1)  
Total provision for (reversal of) credit losses 14 (18)   (10) (4) 3
Balance at end of period 291 277 295 184 291 184
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 320 265   258 265 294
Provision for (reversal of) credit losses originations net of repayments and other derecognitions 7 14   9 21 12
Provision for (reversal of) credit losses changes in model 1       1 12
Provision for (reversal of) credit losses net remeasurement 3 (8)   21 (5) (64)
Transfers to 12-month ECL 30 47   33 77 84
Transfers to lifetime ECL performing (15) (7)   (13) (22) (22)
Total provision for (reversal of) credit losses 26 46   50 72 22
Foreign exchange and other (13) 9   4 (4) (4)
Balance at end of period 333 320 265 312 333 312
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 2,548 2,584     2,584  
Balance at end of period 2,584 2,548 2,584 2,436 2,584 2,436
Loans 2,443 2,396   2,346 2,443 2,346
Undrawn credit facilities and other off-balance sheet exposures 141 152   90 141 90
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 128 126   165 126 142
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (6) (5)   (4) (11) (6)
Provision for (reversal of) credit losses changes in model       4   4
Provision for (reversal of) credit losses net remeasurement 42 36   6 78 44
Transfers to 12-month ECL (35) (35)   (19) (70) (35)
Transfers to lifetime ECL performing 6 7   3 13 6
Transfers to lifetime ECL credit-impaired (3) (2)   (3) (5) (4)
Total provision for (reversal of) credit losses 4 1   (13) 5 9
Foreign exchange and other   1   (1) 1  
Balance at end of period 132 128 126 151 132 151
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 680 546   735 546 709
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (14) (5)   (15) (19) (29)
Provision for (reversal of) credit losses changes in model 21 76     97  
Provision for (reversal of) credit losses net remeasurement 171 187   155 358 338
Transfers to 12-month ECL (208) (126)   (144) (334) (284)
Transfers to lifetime ECL performing 14 23   17 37 36
Transfers to lifetime ECL credit-impaired (17) (19)   (24) (36) (47)
Total provision for (reversal of) credit losses (33) 136   (11) 103 14
Foreign exchange and other   (2)     (2) 1
Balance at end of period 647 680 546 724 647 724
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 683 660   580 660 591
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (10) (5)   (5) (15) (24)
Provision for (reversal of) credit losses changes in model   32     32  
Provision for (reversal of) credit losses net remeasurement 351 264   161 615 326
Transfers to 12-month ECL (250) (232)   (93) (482) (212)
Transfers to lifetime ECL performing 19 21   15 40 33
Transfers to lifetime ECL credit-impaired (91) (57)   (50) (148) (106)
Total provision for (reversal of) credit losses 19 23   28 42 17
Balance at end of period 702 683 660 608 702 608
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 1,057 1,061   912 1,061 864
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (23) (22)   (2) (45) (22)
Provision for (reversal of) credit losses changes in model 2       2 29
Provision for (reversal of) credit losses net remeasurement 139 79   64 218 275
Transfers to 12-month ECL (29) (45)   (30) (74) (79)
Transfers to lifetime ECL performing 16 9   14 25 25
Transfers to lifetime ECL credit-impaired (13) (62)   (24) (75) (135)
Total provision for (reversal of) credit losses 92 (41)   22 51 93
Foreign exchange and other (46) 37 9 19   (4)
Balance at end of period 1,103 1,057 1,061 953 1,103 953
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 912          
Balance at end of period 913 912   887 913 887
Loans 904 903   885 904 885
Undrawn credit facilities and other off-balance sheet exposures 9 9   2 9 2
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 253 234   250 234 224
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (21) (15)   (12) (36) (21)
Provision for (reversal of) credit losses changes in model       11   11
Provision for (reversal of) credit losses net remeasurement 48 41   13 89 56
Transfers to 12-month ECL (3) (1)     (4) (1)
Transfers to lifetime ECL performing (4) (5)   (1) (9) (2)
Transfers to lifetime ECL credit-impaired 3 2   3 5 4
Total provision for (reversal of) credit losses 23 22   14 45 47
Write-offs (2) (2)   (4) (4) (7)
Recoveries   3     3 4
Interest income on impaired loans (9) (8)   (6) (17) (12)
Foreign exchange and other (7) 4   2 (3)  
Balance at end of period 258 253 234 256 258 256
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 187 190   187 190 181
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (7) (7)   (9) (14) (20)
Provision for (reversal of) credit losses net remeasurement 148 112   110 260 218
Transfers to 12-month ECL (3) (2)     (5)  
Transfers to lifetime ECL performing (4) (8)   (1) (12) (2)
Transfers to lifetime ECL credit-impaired 18 20   24 38 47
Total provision for (reversal of) credit losses 152 115   124 267 243
Write-offs (149) (138)   (132) (287) (258)
Recoveries 24 17   15 41 32
Interest income on impaired loans (2) (2)   (2) (4) (3)
Foreign exchange and other (6) 5   4 (1) 1
Balance at end of period 206 187 190 196 206 196
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 92 112   96 204 173
Transfers to lifetime ECL credit-impaired 92 57   50 149 106
Total provision for (reversal of) credit losses 184 169   146 353 279
Write-offs (221) (204)   (177) (425) (337)
Recoveries 37 35   31 72 58
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 472 401   637 401 667
Provision for (reversal of) credit losses originations net of repayments and other derecognitions (12) (21)   (10) (33) (21)
Provision for (reversal of) credit losses net remeasurement 105 103   153 208 264
Transfers to 12-month ECL (1) (2)   (3) (3) (5)
Transfers to lifetime ECL performing (1) (2)   (1) (3) (3)
Transfers to lifetime ECL credit-impaired 13 62   24 75 135
Total provision for (reversal of) credit losses 104 140   163 244 370
Write-offs (85) (77)   (385) (162) (607)
Recoveries 3 14   31 17 49
Interest income on impaired loans (24) (23)   (21) (47) (44)
Foreign exchange and other (21) 17   10 (4)  
Balance at end of period $ 449 $ 472 $ 401 $ 435 $ 449 $ 435