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Total Invested Assets and Related Net Investment Income - Fair Values of Derivative Financial Instruments by Major Class (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial assets [line items]    
Financial assets, at fair value $ 144,673 $ 140,292
Interest rate contracts    
Disclosure of financial assets [line items]    
Financial assets, at fair value 922 1,188
Foreign exchange contracts    
Disclosure of financial assets [line items]    
Financial assets, at fair value 130 177
Other contracts    
Disclosure of financial assets [line items]    
Financial assets, at fair value 60 113
Derivatives    
Disclosure of financial assets [line items]    
Financial liabilities, at fair value (2,295) (1,756)
Interest rate contracts    
Disclosure of financial assets [line items]    
Financial liabilities, at fair value (440) (518)
Foreign exchange contracts    
Disclosure of financial assets [line items]    
Financial liabilities, at fair value (1,820) (1,232)
Other contracts    
Disclosure of financial assets [line items]    
Financial liabilities, at fair value $ (35) $ (6)