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Securities - Summary of Allowance for Credit Losses measured at FVOCI and Amortized Cost (Detail) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2025 | Jan. 31, 2025 | Apr. 30, 2024 | Apr. 30, 2025 | Apr. 30, 2024
Disclosure of financial assets [line items] |  |  |  |  |
Balance at beginning of period | $ 4,376 | $ 4,455 |  | $ 4,455 |
Balance at end of period | 4,455 | 4,376 | $ 4,086 | 4,455 | $ 4,086
Debt securities measured at FVOCI [member] | Debt securities [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Balance at beginning of period | 20 |  |  |  |
Balance at end of period | 18 | 20 | 20 | 18 | 20
Debt securities measured at FVOCI and amortized cost [member] | Debt securities [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Balance at beginning of period | 37 | 36 | 40 | 36 | 42
Reversal of credit losses | (2) | (1) | (2) | (3) | (3)
Foreign exchange and other | (2) | 2 |  |  | (1)
Balance at end of period | 33 | 37 | 38 | 33 | 38
Debt securities measured at amortized cost [member] | Debt securities [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Balance at beginning of period | 17 |  |  |  |
Balance at end of period | 15 | 17 | 18 | 15 | 18
Stage 1 [member] | Debt securities measured at FVOCI [member] | Financial instruments performing [member] | 12-month expected credit losses [member] | Debt securities [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Balance at beginning of period | 2 |  |  |  |
Balance at end of period | 2 | 2 | 1 | 2 | 1
Stage 1 [member] | Debt securities measured at FVOCI and amortized cost [member] | Financial instruments performing [member] | 12-month expected credit losses [member] | Debt securities [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Balance at beginning of period | 7 | 7 | 7 | 7 | 8
Reversal of credit losses | (1) |  | (1) | (1) | (1)
Foreign exchange and other |  |  |  |  | (1)
Balance at end of period | 6 | 7 | 6 | 6 | 6
Stage 1 [member] | Debt securities measured at amortized cost [member] | Financial instruments performing [member] | 12-month expected credit losses [member] | Debt securities [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Balance at beginning of period | 5 |  |  |  |
Balance at end of period | 4 | 5 | 5 | 4 | 5
Stage 2 [member] | Debt securities measured at FVOCI [member] | Financial instruments performing [member] | Lifetime expected credit losses [member] | Debt securities [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Balance at beginning of period | 18 |  |  |  |
Balance at end of period | 16 | 18 | 19 | 16 | 19
Stage 2 [member] | Debt securities measured at FVOCI and amortized cost [member] | Financial instruments performing [member] | Lifetime expected credit losses [member] | Debt securities [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Balance at beginning of period | 18 | 17 | 20 | 17 | 20
Reversal of credit losses | (1) |  | (1) | (1) | (1)
Foreign exchange and other | (1) | 1 |  |  |
Balance at end of period | 16 | 18 | 19 | 16 | 19
Stage 3 [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Balance at beginning of period | 912 |  |  |  |
Balance at end of period | 913 | 912 | 887 | 913 | 887
Stage 3 [member] | Debt securities measured at FVOCI and amortized cost [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Debt securities [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Balance at beginning of period | 12 | 12 | 13 | 12 | 14
Reversal of credit losses |  | (1) |  | (1) | (1)
Foreign exchange and other | (1) | 1 |  |  |
Balance at end of period | 11 | 12 | 13 | 11 | 13
Stage 3 [member] | Debt securities measured at amortized cost [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Debt securities [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Balance at beginning of period | 12 |  |  |  |
Balance at end of period | $ 11 | $ 12 | $ 13 | $ 11 | $ 13

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