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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, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value $ 144,673 $ 140,292
Notional amount 700  
Derivative investments    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 1,101 1,439
Financial liabilities, at fair value (2,134) (1,575)
Notional amount 58,268 53,299
Fair value hedges    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 0 2
Financial liabilities, at fair value (153) (181)
Notional amount 779 690
Cash flow hedges    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 11 37
Financial liabilities, at fair value (8) 0
Notional amount 151 132
Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 1,112 1,478
Financial liabilities, at fair value (2,295) (1,756)
Notional amount $ 59,198 $ 54,121