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Preferred Shares - Preferred Share Dividends Declared (Details) - CAD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 14, 2018 | Oct. 10, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of classes of share capital [line items] |  |  |  |  |
Dividends declared per share | $ 0.04 | $ 0.04 |  |  |
Series A |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Dividends declared |  |  | $ 9 | $ 5 | $ 10
Series B |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Dividends declared |  |  | 1 | 1 | 1
Series C |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Dividends declared |  |  | 14 | 9 | 16
Series E |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Dividends declared |  |  | 15 | 8 | 14
Series G |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Dividends declared |  |  | 11 | 7 | 11
Preferred Shares |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Dividends declared |  |  | $ 50 | $ 30 | $ 52

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