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IFRS 7 Disclosures - Variable Annuity and Segregated Fund Guarantees, Net of Reinsurance (Parenthetical) (Detail) $ in Millions, $ in Millions | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($)
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Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |  |  |
Amount at risk net of reinsurance | $ 6,520 |  | $ 6,690 |
U.S. [member] |  |  |  |
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |  |  |
Amount at risk net of reinsurance |  | $ 4,182 |  | $ 3,995
Canada [member] |  |  |  |
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |  |  |
Amount at risk net of reinsurance | $ 964 |  | $ 1,178 |
Japan [Member] |  |  |  |
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |  |  |
Amount at risk net of reinsurance |  | 71 |  | 104
Asia [member] |  |  |  |
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |  |  |
Amount at risk net of reinsurance |  | $ 111 |  | $ 145

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