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Securities - Schedule of Fair Value of Debt Securities Measured and Equity Securities Designated at FVOCI (Detail) - CAD ($) $ in Millions | Jan. 31, 2025 | Oct. 31, 2024
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Debt Securities [member] |  |
Disclosure of financial assets [line items] |  |
Amortised cost on FVOCI securities, Total | $ 78,994 | $ 76,359
Gross unrealized gains on FVOCI securities | 72 | 50
Gross unrealized losses on FVOCI securities | (298) | (388)
Financial assets measured at fair value through other comprehensive income | 78,768 | 76,021
Unrealized gain losses on FVOCI securities [member] |  |
Disclosure of financial assets [line items] |  |
Amortised cost on FVOCI securities, Total | 79,964 | 77,012
Gross unrealized gains on FVOCI securities | 130 | 101
Gross unrealized losses on FVOCI securities | (333) | (420)
Financial assets measured at fair value through other comprehensive income | 79,761 | 76,693
Unrealized gain losses on FVOCI securities [member] | Canadian federal government [member] | Debt Securities [member] |  |
Disclosure of financial assets [line items] |  |
Amortised cost on FVOCI securities, Total | 13,693 | 11,715
Gross unrealized gains on FVOCI securities | 3 | 1
Gross unrealized losses on FVOCI securities | (36) | (31)
Financial assets measured at fair value through other comprehensive income | 13,660 | 11,685
Unrealized gain losses on FVOCI securities [member] | Other Canadian governments [member] | Debt Securities [member] |  |
Disclosure of financial assets [line items] |  |
Amortised cost on FVOCI securities, Total | 15,366 | 16,506
Gross unrealized gains on FVOCI securities | 6 | 9
Gross unrealized losses on FVOCI securities | (121) | (101)
Financial assets measured at fair value through other comprehensive income | 15,251 | 16,414
Unrealized gain losses on FVOCI securities [member] | U.S. Treasury and agencies [member] | Debt Securities [member] |  |
Disclosure of financial assets [line items] |  |
Amortised cost on FVOCI securities, Total | 29,900 | 29,362
Gross unrealized gains on FVOCI securities | 28 | 10
Gross unrealized losses on FVOCI securities | (108) | (220)
Financial assets measured at fair value through other comprehensive income | 29,820 | 29,152
Unrealized gain losses on FVOCI securities [member] | Other foreign governments [member] | Debt Securities [member] |  |
Disclosure of financial assets [line items] |  |
Amortised cost on FVOCI securities, Total | 5,717 | 5,542
Gross unrealized gains on FVOCI securities | 23 | 22
Gross unrealized losses on FVOCI securities | (3) | (4)
Financial assets measured at fair value through other comprehensive income | 5,737 | 5,560
Unrealized gain losses on FVOCI securities [member] | Mortgage backed securities [member] | Debt Securities [member] |  |
Disclosure of financial assets [line items] |  |
Amortised cost on FVOCI securities, Total | 3,579 | 3,493
Gross unrealized gains on FVOCI securities | 1 |
Gross unrealized losses on FVOCI securities | (23) | (23)
Financial assets measured at fair value through other comprehensive income | 3,557 | 3,470
Unrealized gain losses on FVOCI securities [member] | Asset backed securities [member] | Debt Securities [member] |  |
Disclosure of financial assets [line items] |  |
Amortised cost on FVOCI securities, Total | 734 | 656
Gross unrealized gains on FVOCI securities | 2 | 1
Financial assets measured at fair value through other comprehensive income | 736 | 657
Unrealized gain losses on FVOCI securities [member] | Corporate debt [member] | Debt Securities [member] |  |
Disclosure of financial assets [line items] |  |
Amortised cost on FVOCI securities, Total | 10,005 | 9,085
Gross unrealized gains on FVOCI securities | 9 | 7
Gross unrealized losses on FVOCI securities | (7) | (9)
Financial assets measured at fair value through other comprehensive income | 10,007 | 9,083
Unrealized gain losses on FVOCI securities [member] | Corporate equity [member] | Equity Securities [member] |  |
Disclosure of financial assets [line items] |  |
Amortised cost on FVOCI securities, Total | 970 | 653
Gross unrealized gains on FVOCI securities | 58 | 51
Gross unrealized losses on FVOCI securities | (35) | (32)
Financial assets measured at fair value through other comprehensive income | $ 993 | $ 672

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