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Financial Instrument Risk Management - Narrative (Details) - CAD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of financial assets [line items] |  |
Percent of debt security portfolio considered investment grade | 99.00% | 98.00%
Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Impairment loss on available-for-sale assets | $ 12,000,000 | $ 7,000,000
Debt securities | Available-for-sale |  |
Disclosure of financial assets [line items] |  |
Reversal of impairment | $ 0 | $ 0

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