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Significant Events - Normal Course Issuer Bid (Details) - CAD ($) $ / shares in Units, $ in Millions | Mar. 09, 2018 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of classes of share capital [line items] |  |  |
Restricted cash (Note 22) |  | $ 0 | $ 30
NCIB Program |  |  |
Disclosure of classes of share capital [line items] |  |  |
Stock purchase agreement, number of shares authorized | 14,000,000 |  |
Stock purchase agreement, maximum shares purchase for a single trading day | 102,039 |  |
Stock purchase agreement, Toronto Stock Exchange, twenty-five percent of daily trading volume | 408,156 |  |
Number of shares issued and fully paid |  | 3,264,500 |
Par value per share |  | $ 7.02 |
Issued capital (Note 24) |  | $ 23 |

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