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IFRS 7 Disclosures - Variable Annuity and Segregated Fund Guarantees, Net of Reinsurance (Parenthetical) (Detail) $ in Millions, $ in Millions | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($)
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Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |  |  |
Amount at risk net of reinsurance | $ 12,853 |  | $ 6,683 |
U.S. [member] |  |  |  |
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |  |  |
Amount at risk net of reinsurance |  | $ 6,899 |  | $ 3,982
Canada [member] |  |  |  |
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |  |  |
Amount at risk net of reinsurance | $ 2,654 |  | $ 1,342 |
Japan [Member] |  |  |  |
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |  |  |
Amount at risk net of reinsurance |  | 332 |  | 95
Asia [member] |  |  |  |
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items] |  |  |  |
Amount at risk net of reinsurance |  | $ 246 |  | $ 181

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