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Total Invested Assets and Related Net Investment Income - Fair Values of Derivative Financial Instruments by Major Class (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of financial assets [line items] |  |
Financial assets, at fair value | $ 175,070 | $ 156,591
Interest rate contracts |  |
Disclosure of financial assets [line items] |  |
Financial assets, at fair value | 1,409 | 1,198
Foreign exchange contracts |  |
Disclosure of financial assets [line items] |  |
Financial assets, at fair value | 659 | 242
Other contracts |  |
Disclosure of financial assets [line items] |  |
Financial assets, at fair value | 92 | 108
Derivatives |  |
Disclosure of financial assets [line items] |  |
Financial liabilities, at fair value | (1,744) | (2,040)
Interest rate contracts |  |
Disclosure of financial assets [line items] |  |
Financial liabilities, at fair value | (340) | (517)
Foreign exchange contracts |  |
Disclosure of financial assets [line items] |  |
Financial liabilities, at fair value | (1,382) | (1,516)
Other contracts |  |
Disclosure of financial assets [line items] |  |
Financial liabilities, at fair value | $ (22) | $ (7)

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