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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, 2022 | Dec. 31, 2021
--- | --- | ---
Disclosure of financial assets [line items] |  |
Fair value | $ 160,982 | $ 177,789
Interest rate contracts |  |
Disclosure of financial assets [line items] |  |
Liabilities | (1,138) | (366)
Foreign exchange contracts |  |
Disclosure of financial assets [line items] |  |
Liabilities | (1,203) | (1,018)
Other contracts |  |
Disclosure of financial assets [line items] |  |
Liabilities | (10) | (8)
Derivatives |  |
Disclosure of financial assets [line items] |  |
Liabilities | (2,351) | (1,392)
Interest rate contracts |  |
Disclosure of financial assets [line items] |  |
Fair value | 704 | 942
Foreign exchange contracts |  |
Disclosure of financial assets [line items] |  |
Fair value | 1,300 | 527
Other contracts |  |
Disclosure of financial assets [line items] |  |
Fair value | 91 | 114
Derivatives |  |
Disclosure of financial assets [line items] |  |
Fair value | $ 2,095 | $ 1,583

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