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Securities - Schedule of Fair Value of Debt Securities Measured and Equity Securities Designated at FVOCI (Detail) - CAD ($) $ in Millions | Apr. 30, 2025 | Oct. 31, 2024
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Debt Securities [member] |  |
Disclosure of financial assets [line items] |  |
Amortised cost on FVOCI securities, Total | $ 82,362 | $ 76,359
Gross unrealized gains on FVOCI securities | 91 | 50
Gross unrealized losses on FVOCI securities | (378) | (388)
Financial assets measured at fair value through other comprehensive income | 82,075 | 76,021
Unrealized gain losses on FVOCI securities [member] |  |
Disclosure of financial assets [line items] |  |
Amortised cost on FVOCI securities, Total | 83,279 | 77,012
Gross unrealized gains on FVOCI securities | 153 | 101
Gross unrealized losses on FVOCI securities | (401) | (420)
Financial assets measured at fair value through other comprehensive income | 83,031 | 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 | 14,175 | 11,715
Gross unrealized gains on FVOCI securities | 2 | 1
Gross unrealized losses on FVOCI securities | (45) | (31)
Financial assets measured at fair value through other comprehensive income | 14,132 | 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 | 16,352 | 16,506
Gross unrealized gains on FVOCI securities | 4 | 9
Gross unrealized losses on FVOCI securities | (168) | (101)
Financial assets measured at fair value through other comprehensive income | 16,188 | 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 | 30,467 | 29,362
Gross unrealized gains on FVOCI securities | 46 | 10
Gross unrealized losses on FVOCI securities | (131) | (220)
Financial assets measured at fair value through other comprehensive income | 30,382 | 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 | 6,538 | 5,542
Gross unrealized gains on FVOCI securities | 27 | 22
Gross unrealized losses on FVOCI securities | (3) | (4)
Financial assets measured at fair value through other comprehensive income | 6,562 | 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 | 3,839 | 3,493
Gross unrealized gains on FVOCI securities | 1 |
Gross unrealized losses on FVOCI securities | (20) | (23)
Financial assets measured at fair value through other comprehensive income | 3,820 | 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 | 1,268 | 656
Gross unrealized gains on FVOCI securities | 1 | 1
Gross unrealized losses on FVOCI securities | (2) |
Financial assets measured at fair value through other comprehensive income | 1,267 | 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 | 9,723 | 9,085
Gross unrealized gains on FVOCI securities | 10 | 7
Gross unrealized losses on FVOCI securities | (9) | (9)
Financial assets measured at fair value through other comprehensive income | 9,724 | 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 | 917 | 653
Gross unrealized gains on FVOCI securities | 62 | 51
Gross unrealized losses on FVOCI securities | (23) | (32)
Financial assets measured at fair value through other comprehensive income | $ 956 | $ 672

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