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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 | 3 Months Ended
--- | ---
Jan. 31, 2025 | Oct. 31, 2024 | Jan. 31, 2024
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Opening balance | $ 916 | $ 941 | $ 953
Realized | (2) | (3) | 1
Unrealized | 4 | (15) | 91
Net unrealized gains (losses) included in OCI | 13 | (2) | (6)
Transfer in to Level 3 |  |  | 2
Transfer out of Level 3 | (5) | (16) | (3)
Purchases/Issuances | 416 | 40 | 81
Sales/Settlements | (38) | (29) | (88)
Closing balance | 1,304 | 916 | 1,031
Opening balance | (1,499) | (1,379) | (2,116)
Realized | 5 | 2 | 10
Unrealized | (333) | (175) | 446
Transfer in to Level 3 | (3) | (2) | (1)
Transfer out of Level 3 | 35 | 10 | 319
Purchases/Issuances | (1) | (22) | (77)
Sales/Settlements | 78 | 67 | 47
Closing balance | (1,718) | (1,499) | (1,372)
Deposits and other liabilities [member] |  |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Opening balance | (416) | (388) | (242)
Realized | 5 | 2 | 9
Unrealized | (23) | (52) | (114)
Transfer in to Level 3 | (3) |  |
Transfer out of Level 3 | 2 | 2 | 7
Purchases/Issuances | (1) | (18) | (77)
Sales/Settlements | 57 | 38 | 18
Closing balance | (379) | (416) | (399)
Interest rate derivatives [member] | Derivative liabilities [member] |  |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Opening balance | (1,028) | (934) | (1,817)
Unrealized | (310) | (119) | 569
Transfer out of Level 3 | 33 | 3 | 311
Purchases/Issuances |  | (4) |
Sales/Settlements | 21 | 26 | 29
Closing balance | (1,284) | (1,028) | (908)
Interest rate derivatives [member] | Derivative Assets [member] |  |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Opening balance | 51 | 86 | 21
Unrealized | (23) | (23) | 97
Transfer out of Level 3 | (5) | (12) | (1)
Closing balance | 23 | 51 | 117
Foreign exchange derivatives [member] | Derivative liabilities [member] |  |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Opening balance | (4) | (5) |
Unrealized | 4 | (4) | (9)
Transfer out of Level 3 |  | 5 |
Closing balance |  | (4) | (9)
Foreign exchange derivatives [member] | Derivative Assets [member] |  |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Unrealized | 12 |  |
Closing balance | 12 |  |
Credit derivatives [member] | Derivative liabilities [member] |  |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Opening balance | (50) | (51) | (52)
Realized |  |  | 1
Unrealized | (4) |  | 1
Sales/Settlements |  | 1 |
Closing balance | (54) | (50) | (50)
Credit derivatives [member] | Derivative Assets [member] |  |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Opening balance | 44 | 46 | 46
Realized |  | (2) | (1)
Unrealized | 5 | (1) |
Purchases/Issuances |  | 1 |
Closing balance | 49 | 44 | 45
Equity derivatives [member] | Derivative liabilities [member] |  |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Opening balance | (1) | (1) | (5)
Unrealized |  |  | (1)
Transfer in to Level 3 |  | (2) | (1)
Transfer out of Level 3 |  |  | 1
Sales/Settlements |  | 2 |
Closing balance | (1) | (1) | (6)
Equity derivatives [member] | Derivative Assets [member] |  |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Opening balance | 6 | 9 | 4
Unrealized |  | 1 |
Transfer in to Level 3 |  |  | 2
Transfer out of Level 3 |  | (4) | (2)
Purchases/Issuances |  |  | 2
Sales/Settlements |  |  | (1)
Closing balance | 6 | 6 | 5
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 | 623 | 587
Realized | (2) | (1) | 2
Unrealized | 20 | 7 | (6)
Net unrealized gains (losses) included in OCI | 9 | (3) | (2)
Purchases/Issuances | 304 | 25 | 30
Sales/Settlements | (9) | (11) | (25)
Closing balance | 962 | 640 | 586
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 | 64 | 151
Unrealized | (1) |  | (3)
Purchases/Issuances | 22 | 14 | 49
Sales/Settlements | (19) | (8) | (50)
Closing balance | 72 | 70 | 147
Corporate debt [member] | Debt securities measured at FVTPL [member] |  |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Unrealized | (10) |  |
Purchases/Issuances | 90 |  |
Closing balance | 80 |  |
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 | 113 | 144
Unrealized | 1 | 1 | 3
Net unrealized gains (losses) included in OCI | 4 | 1 | (4)
Sales/Settlements | (10) | (10) | (12)
Closing balance | $ 100 | $ 105 | $ 131

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