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Risk Management - Schedule of Maturity of Financial Liabilities (Parenthetical) (Detail) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Jan. 01, 2022
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Disclosure Of Maturity Analysis For Financial Liabilities [line items] |  |  |
Carrying value of deposits from Bank clients | $ 21,616 | $ 22,507 | $ 20,720
Fair value of deposits from Bank clients | $ 21,518 |  |
Level 2 [Member] |  |  |
Disclosure Of Maturity Analysis For Financial Liabilities [line items] |  |  |
Carrying value of deposits from Bank clients |  | 22,507 |
Fair value of deposits from Bank clients |  | $ 22,271 |

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