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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

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