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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, 2019
Dec. 31, 2018
Disclosure of financial assets [line items]    
Financial assets, at fair value $ 156,591 $ 144,673
Interest rate contracts    
Disclosure of financial assets [line items]    
Financial assets, at fair value 1,198 922
Foreign exchange contracts    
Disclosure of financial assets [line items]    
Financial assets, at fair value 242 130
Other contracts    
Disclosure of financial assets [line items]    
Financial assets, at fair value 108 60
Derivatives    
Disclosure of financial assets [line items]    
Financial liabilities, at fair value (2,040) (2,295)
Interest rate contracts    
Disclosure of financial assets [line items]    
Financial liabilities, at fair value (517) (440)
Foreign exchange contracts    
Disclosure of financial assets [line items]    
Financial liabilities, at fair value (1,516) (1,820)
Other contracts    
Disclosure of financial assets [line items]    
Financial liabilities, at fair value $ (7) $ (35)