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Total Invested Assets and Related Net Investment Income - Fair Values of Derivative Financial Instruments by Type of Hedge (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of detailed information about financial instruments [line items] |  |
Financial assets, at fair value | $ 177,789 | $ 175,070
Derivative investments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 64,761 | 61,680
Financial assets, at fair value | 1,536 | 2,140
Financial liabilities, at fair value | (1,390) | (1,722)
Fair value hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 414 | 278
Financial assets, at fair value | 1 | 5
Financial liabilities, at fair value | (2) | (2)
Cash flow hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 791 | 834
Financial assets, at fair value | 46 | 15
Financial liabilities, at fair value | 0 | (20)
Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 65,966 | 62,792
Financial assets, at fair value | 1,583 | 2,160
Financial liabilities, at fair value | $ (1,392) | $ (1,744)

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