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Securities - Summary of Allowance for Credit Losses measured at FVOCI and Amortized Cost (Detail) - CAD ($) $ in Millions | 3 Months Ended
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Jan. 31, 2025 | Oct. 31, 2024 | Jan. 31, 2024
Disclosure of financial assets [line items] |  |  |
Balance at beginning of period | $ 4,114 |  |
Balance at end of period | 4,376 | $ 4,114 | $ 4,182
Debt securities measured at FVOCI [member] | Debt securities [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Balance at beginning of period | 19 |  |
Balance at end of period | 20 | 19 | 21
Debt securities measured at FVOCI and amortized cost [member] | Debt securities [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Balance at beginning of period | 36 | 37 | 42
Provision for (reversal of) credit losses | (1) | (1) | (1)
Foreign exchange and other | 2 |  | (1)
Balance at end of period | 37 | 36 | 40
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 | 17 | 17 | 19
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
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 | 8
Foreign exchange and other |  |  | (1)
Balance at end of period | 7 | 7 | 7
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 | 5 | 5 | 6
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 | 17 |  |
Balance at end of period | 18 | 17 | 20
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 | 17 | 18 | 20
Provision for (reversal of) credit losses |  | (1) |
Foreign exchange and other | 1 |  |
Balance at end of period | 18 | 17 | 20
Stage 3 [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Balance at beginning of period | 825 |  |
Balance at end of period | 912 | 825 | 1,074
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 | 14
Provision for (reversal of) credit losses | (1) |  | (1)
Foreign exchange and other | 1 |  |
Balance at end of period | 12 | 12 | 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 | $ 12 | $ 12 | $ 13

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