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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, 2021 | Dec. 31, 2020
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Disclosure of financial assets [line items] |  |
Financial assets, at fair value | $ 177,789 | $ 175,070
Interest rate contracts |  |
Disclosure of financial assets [line items] |  |
Financial liabilities, at fair value | (366) | (340)
Foreign exchange contracts |  |
Disclosure of financial assets [line items] |  |
Financial liabilities, at fair value | (1,018) | (1,382)
Other contracts |  |
Disclosure of financial assets [line items] |  |
Financial liabilities, at fair value | (8) | (22)
Derivatives |  |
Disclosure of financial assets [line items] |  |
Financial liabilities, at fair value | (1,392) | (1,744)
Interest rate contracts |  |
Disclosure of financial assets [line items] |  |
Financial assets, at fair value | 942 | 1,409
Foreign exchange contracts |  |
Disclosure of financial assets [line items] |  |
Financial assets, at fair value | 527 | 659
Other contracts |  |
Disclosure of financial assets [line items] |  |
Financial assets, at fair value | 114 | 92
Derivatives |  |
Disclosure of financial assets [line items] |  |
Financial assets, at fair value | $ 1,583 | $ 2,160

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