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Insurance and Reinsurance Contract Assets and Liabilities - Summary of Actuarial Methods and Assumptions (Parenthetical) (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |  |  |  |
Impact of changes in actuarial methods and assumptions, pre-tax | $ 2,850 | $ 347 | $ 347 | $ 3,197 | $ (192)
Non-controlling interests [member] |  |  |  |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |  |  |  |
Impact of changes in actuarial methods and assumptions, pre-tax | 97 | 103 | 103 |  | 8
Non-controlling interests [member] | CSM [Member] |  |  |  |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |  |  |  |
Impact of changes in actuarial methods and assumptions, pre-tax | $ 87 | $ 72 | $ 72 |  | $ 0

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