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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
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