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Preferred Shares - Issued and Outstanding (Details) - CAD CAD in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 17, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares issued and outstanding |  | 38,600,000 | 1,824,620.00 | 38,600,000
Preferred Shares |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares outstanding | 38,600,000 | 38,600,000 |  |
Common shares (Note 23) | CAD 942 | CAD 942 |  |
Series A |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares outstanding | 10,200,000 | 10,200,000 | 12,000,000 |
Number of shares issued and outstanding |  | 10,200,000 |  | 12,000,000
Common shares (Note 23) | CAD 248 | CAD 248 |  |
Series B |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares outstanding | 1,800,000 | 1,800,000 |  |
Number of shares issued and outstanding |  | 1,800,000 |  | 0
Common shares (Note 23) | CAD 45 | CAD 45 |  |
Series C |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares outstanding | 11,000,000 | 11,000,000 |  |
Number of shares issued and outstanding |  | 11,000,000 |  | 11,000,000
Common shares (Note 23) | CAD 269 | CAD 269 |  |
Series E |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares outstanding | 9,000,000 | 9,000,000 |  |
Number of shares issued and outstanding |  | 9,000,000 |  | 9,000,000
Common shares (Note 23) | CAD 219 | CAD 219 |  |
Series G |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares outstanding | 6,600,000 | 6,600,000 |  |
Number of shares issued and outstanding |  | 6,600,000 |  | 6,600,000
Common shares (Note 23) | CAD 161 | CAD 161 |  |

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