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Risk Categories - Credit and Swap Spread Sensitivities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Credit spread sensitivities    
Disclosure of detailed information about financial instruments [line items]    
Reasonably possible change in risk variable 50.00%  
Credit Spread Sensitivities [Abstract]    
50 basis point decrease $ (75) $ (100)
50 basis point increase 75 100
Swap Spread Sensitivities [Abstract]    
Level of rounding used in sensitivity analysis $ 25 $ 25
Period after which credit spread reverts to long-term insurance contract liability 5 years 5 years
Swap spread sensitivities    
Disclosure of detailed information about financial instruments [line items]    
Reasonably possible change in risk variable 20.00%  
Swap Spread Sensitivities [Abstract]    
20 basis point decrease $ 25 $ 25
20 basis point increase (25) (25)
Level of rounding used in sensitivity analysis $ 25 $ 25