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Fair Value Measurement - Changes in Fair Value of Financial Assets and Liabilities in Level 3 (Detail) - Level 3 of fair value hierarchy [member] - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2025 | Oct. 31, 2024
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |
Opening balance | $ 916 | $ 953
Realized |  | 1
Unrealized | 33 | 129
Net unrealized gains (losses) included in OCI | 13 | (17)
Transfer in to Level 3 | 426 | 2
Transfer out of Level 3 | (28) | (73)
Purchases/Issuances | 878 | 204
Sales/Settlements | (439) | (283)
Closing balance | 1,799 | 916
Opening balance | (1,499) | (2,116)
Realized | 8 | (13)
Unrealized | (427) | 110
Transfer in to Level 3 | (9) | (8)
Transfer out of Level 3 | 241 | 473
Purchases/Issuances | (160) | (128)
Sales/Settlements | 227 | 183
Closing balance | (1,619) | (1,499)
Deposits and other liabilities [member] |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |
Opening balance | (416) | (242)
Realized | 8 | (14)
Unrealized | (127) | (156)
Transfer in to Level 3 | (4) | (3)
Transfer out of Level 3 | 2 | 17
Purchases/Issuances | (120) | (120)
Sales/Settlements | 181 | 102
Closing balance | (476) | (416)
Interest rate derivatives [member] | Derivative liabilities [member] |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |
Opening balance | (1,028) | (1,817)
Unrealized | (263) | 297
Transfer out of Level 3 | 190 | 425
Purchases/Issuances |  | (8)
Sales/Settlements | 46 | 75
Closing balance | (1,055) | (1,028)
Interest rate derivatives [member] | Derivative Assets [member] |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |
Opening balance | 51 | 21
Unrealized | 45 | 97
Transfer out of Level 3 | (17) | (67)
Closing balance | 79 | 51
Foreign exchange derivatives [member] | Derivative liabilities [member] |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |
Opening balance | (4) |
Unrealized | (49) | (31)
Transfer out of Level 3 | 35 | 27
Closing balance | (18) | (4)
Credit derivatives [member] | Derivative liabilities [member] |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |
Opening balance | (50) | (52)
Realized |  | 1
Unrealized | 9 | 1
Transfer in to Level 3 |  | (2)
Sales/Settlements |  | 2
Closing balance | (41) | (50)
Credit derivatives [member] | Derivative Assets [member] |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |
Opening balance | 44 | 46
Realized |  | (6)
Unrealized | (8) | 2
Purchases/Issuances |  | 2
Closing balance | 36 | 44
Equity derivatives [member] | Derivative liabilities [member] |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |
Opening balance | (1) | (5)
Unrealized | 3 | (1)
Transfer in to Level 3 | (5) | (3)
Transfer out of Level 3 | 14 | 4
Purchases/Issuances | (40) |
Sales/Settlements |  | 4
Closing balance | (29) | (1)
Equity derivatives [member] | Derivative Assets [member] |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |
Opening balance | 6 | 4
Unrealized | 5 | 2
Transfer in to Level 3 | 40 | 2
Transfer out of Level 3 | (11) | (6)
Purchases/Issuances | 11 | 5
Sales/Settlements |  | (1)
Closing balance | 51 | 6
Corporate equity [member] | Equity securities mandatorily measured at FVTPL and designated at FVOCI [Member] |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |
Opening balance | 640 | 587
Realized |  | 7
Unrealized | 69 | 26
Net unrealized gains (losses) included in OCI | 15 | (17)
Purchases/Issuances | 400 | 113
Sales/Settlements | (61) | (76)
Closing balance | 1,063 | 640
Mortgage and asset backed [member] | Debt securities measured at FVTPL [member] |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |
Opening balance | 70 | 151
Unrealized | (1) | (3)
Transfer in to Level 3 | 386 |
Purchases/Issuances | 106 | 84
Sales/Settlements | (169) | (162)
Closing balance | 392 | 70
Corporate and other debt [member] | Debt securities measured at FVTPL [member] |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |
Unrealized | (78) |
Net unrealized gains (losses) included in OCI | (2) |
Purchases/Issuances | 183 |
Closing balance | 103 |
Business and government [member] | Loans measured at FVTPL [member] |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |
Opening balance | 105 | 144
Unrealized | 1 | 5
Purchases/Issuances | 178 |
Sales/Settlements | (209) | (44)
Closing balance | $ 75 | $ 105

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