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Risk Categories - Credit and Swap Spread Sensitivities (Details) - CAD ($) $ in Millions | 12 Months Ended
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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

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