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Total Invested Assets and Related Net Investment Income - Fair Values of Derivative Financial Instruments by Type of Hedge (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of detailed information about financial instruments [line items] |  |
Financial assets, at fair value | $ 144,673 | $ 140,292
Notional amount | 700 |
Derivative investments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets, at fair value | 1,101 | 1,439
Financial liabilities, at fair value | (2,134) | (1,575)
Notional amount | 58,268 | 53,299
Fair value hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets, at fair value | 0 | 2
Financial liabilities, at fair value | (153) | (181)
Notional amount | 779 | 690
Cash flow hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets, at fair value | 11 | 37
Financial liabilities, at fair value | (8) | 0
Notional amount | 151 | 132
Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets, at fair value | 1,112 | 1,478
Financial liabilities, at fair value | (2,295) | (1,756)
Notional amount | $ 59,198 | $ 54,121

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