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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, 2020 | Dec. 31, 2019
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Disclosure of detailed information about financial instruments [line items] |  |
Financial assets, at fair value | $ 175,070 | $ 156,591
Derivative investments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets, at fair value | 2,140 | 1,517
Financial liabilities, at fair value | (1,722) | (1,831)
Notional amount | 61,680 | 60,707
Fair value hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets, at fair value | 5 | 0
Financial liabilities, at fair value | (2) | (208)
Notional amount | 278 | 616
Cash flow hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets, at fair value | 15 | 31
Financial liabilities, at fair value | (20) | (1)
Notional amount | 834 | 808
Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets, at fair value | 2,160 | 1,548
Financial liabilities, at fair value | (1,744) | (2,040)
Notional amount | $ 62,792 | $ 62,131

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