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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, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value $ 156,591 $ 144,673
Derivative investments    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 1,517 1,101
Financial liabilities, at fair value (1,831) (2,134)
Notional amount 60,707 58,268
Fair value hedges    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 0 0
Financial liabilities, at fair value (208) (153)
Notional amount 616 779
Cash flow hedges    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 31 11
Financial liabilities, at fair value (1) (8)
Notional amount 808 151
Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 1,548 1,112
Financial liabilities, at fair value (2,040) (2,295)
Notional amount $ 62,131 $ 59,198