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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
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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)

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