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Risk Management - Variable Annuity and Segregated Fund Guarantees, Net of Reinsurance (Parenthetical) (Detail) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |
Amount at risk net of reinsurance | $ 2,463 | $ 3,829
U.S. [member] |  |
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |
Amount at risk net of reinsurance | 391 | 737
Canada [member] |  |
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |
Amount at risk net of reinsurance | 1,559 | 2,154
Japan [member |  |
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |
Amount at risk net of reinsurance | 140 | 275
Asia [Member] |  |
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |
Amount at risk net of reinsurance | $ 155 | $ 224

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