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Insurance and Reinsurance Contract Assets and Liabilities - Summary of Actuarial Methods and Assumptions (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)
Impact of changes in actuarial methods and assumptions, pre-tax | (2,850) | (347) | (347) | (3,197) | 192
Canada variable annuity product review [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 | 0 | (133) | (133) | (133) |
Impact of changes in actuarial methods and assumptions, pre-tax | 0 | 133 | 133 | 133 |
Long-term care triennial review [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 |  |  |  |  | 118
Impact of changes in actuarial methods and assumptions, pre-tax |  |  |  |  | (118)
Mortality and morbidity updates [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 | 0 | 265 | 265 | 265 | 83
Impact of changes in actuarial methods and assumptions, pre-tax | 0 | (265) | (265) | (265) | (83)
Lapse and policyholder behaviour updates [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 | 0 | 98 | 98 | 98 | 234
Impact of changes in actuarial methods and assumptions, pre-tax | 0 | (98) | (98) | (98) | (234)
Methodology and other updates [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 | (2,850) | (577) | (577) | (3,427) | (243)
Impact of changes in actuarial methods and assumptions, pre-tax | 2,850 | 577 | 577 | 3,427 | 243
Portion recognized in net income (loss) [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 | 259 | 85 | 85 | 344 | (3)
Impact of changes in actuarial methods and assumptions, pre-tax | (259) | (85) | (85) | (344) | 3
Portion recognized in OCI [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 | (47) | 146 | 146 | 99 | 90
Impact of changes in actuarial methods and assumptions, pre-tax | 47 | (146) | (146) | (99) | (90)
Portion recognized in 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 | 2,638 | 116 | 116 | 2,754 | (279)
Impact of changes in actuarial methods and assumptions, pre-tax | (2,638) | (116) | (116) | (2,754) | 279
Participating policyholders [Member] | Portion recognized in net income (loss) [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 | 115 | 58 | 58 | 173 | (26)
Impact of changes in actuarial methods and assumptions, pre-tax | (115) | (58) | (58) | (173) | 26
Participating policyholders [Member] | Portion recognized in OCI [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 | (21) | 0 | 0 | (21) |
Impact of changes in actuarial methods and assumptions, pre-tax | 21 | 0 | 0 | 21 |
Shareholders [Member] | Portion recognized in net income (loss) [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 | 144 | 27 | 27 | 171 |
Impact of changes in actuarial methods and assumptions, pre-tax | (144) | (27) | (27) | (171) |
Shareholders [Member] | Portion recognized in OCI [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 | (26) | 146 | 146 | 120 |
Impact of changes in actuarial methods and assumptions, pre-tax | $ 26 | $ (146) | $ (146) | $ (120) |
Shareholders and other equity holders [Member] | Portion recognized in net income (loss) [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 |  |  |  |  | 23
Impact of changes in actuarial methods and assumptions, pre-tax |  |  |  |  | (23)
Shareholders and other equity holders [Member] | Portion recognized in OCI [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 |  |  |  |  | 90
Impact of changes in actuarial methods and assumptions, pre-tax |  |  |  |  | $ (90)

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