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IFRS 7 Disclosures - Variable Annuity and Segregated Fund Guarantees, Net of Reinsurance (Parenthetical) (Detail) $ in Millions, $ in Millions | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($)
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Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |  |  |
Amount at risk net of reinsurance | $ 3,829 |  | $ 2,757 |
U.S. [member] |  |  |  |
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |  |  |
Amount at risk net of reinsurance |  | $ 737 |  | $ 1,336
Canada [member] |  |  |  |
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |  |  |
Amount at risk net of reinsurance | $ 2,154 |  | $ 886 |
Japan [Member] |  |  |  |
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |  |  |
Amount at risk net of reinsurance |  | 275 |  | 53
Asia [member] |  |  |  |
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |  |  |
Amount at risk net of reinsurance |  | $ 224 |  | $ 87

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