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Risk Categories - Interest Rate and Equity Market Sensitivities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Interest rate risk    
Disclosure of detailed information about financial instruments [line items]    
Reasonably possible 100 basis point change in risk variable 1.00%  
Reasonably possible 50 basis point change in risk variable 0.50% 0.50%
Interest Rate Sensitivity, Potential Impact On Net Income [Abstract]    
50 basis point decrease $ (100) $ (100)
50 basis point increase 50 50
Interest Rate Sensitivity, Potential Impact On Other Comprehensive Income [Abstract]    
50 basis point decrease 250 250
50 basis point increase (250) (250)
Equity Markets Sensitivity, Potential Impact On Other Comprehensive Income [Abstract]    
Level of rounding used in sensitivity analysis $ 50 $ 50
Equity price risk    
Disclosure of detailed information about financial instruments [line items]    
Reasonably possible 25% change in risk variable 25.00% 25.00%
Reasonably possible 10% change in risk variable 10.00% 10.00%
Equity Market Sensitivity, Potential Impact On Net Income [Abstract]    
25% decrease $ (300) $ (300)
10% decrease (100) (100)
10% increase 100 100
25% increase 250 300
Equity Markets Sensitivity, Potential Impact On Other Comprehensive Income [Abstract]    
25% decrease (100) (200)
10% decrease (50) (50)
10% increase 50 50
25% increase 100 200
Level of rounding used in sensitivity analysis $ 50 $ 50
Bottom of range | Interest rate risk    
Equity Markets Sensitivity, Potential Impact On Other Comprehensive Income [Abstract]    
Interval to determine impact of re-balancing interest rate hedges for dynamic hedging programs 0.10% 0.10%
Bottom of range | Equity price risk    
Equity Markets Sensitivity, Potential Impact On Other Comprehensive Income [Abstract]    
Interval to determine impact of re-balancing equity hedges for dynamic hedging programs 2.00% 2.00%
Top of range | Equity price risk    
Equity Markets Sensitivity, Potential Impact On Other Comprehensive Income [Abstract]    
Interval to determine impact of re-balancing equity hedges for dynamic hedging programs 5.00% 5.00%
Equity hedge interval 25.00% 25.00%