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Common Share capital (Details) shares in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 CAD ($) shares | Jul. 31, 2018 CAD ($) | Nov. 30, 2017 CAD ($) shares | Dec. 31, 2018 Vote shares | Dec. 31, 2017 shares
Common Share capital |  |  |  |  |
Minimum percentage of common shares issued and outstanding owned by Canadians |  |  |  | 66.667% |
Common shares reserved for issuance | 47 |  |  | 47 |
First Preferred Shares |  |  |  |  |
Common Share capital |  |  |  |  |
Shares authorized | 1,000 |  |  | 1,000 | 1,000
Second Preferred Shares |  |  |  |  |
Common Share capital |  |  |  |  |
Shares authorized | 1,000 |  |  | 1,000 | 1,000
Common Shares |  |  |  |  |
Common Share capital |  |  |  |  |
Shares authorized | 2,000 |  |  | 2,000 | 2,000
Number of votes per common share | Vote |  |  |  | 1 |
Common Shares | Maximum |  |  |  |  |
Common Share capital |  |  |  |  |
Purchase of common shares related to normal course issuer bid | 8 |  | 8 |  |
Cost of purchase of common shares related to normal course issuer bid | $ | $ 250 |  | $ 250 |  |
Common Shares | Maximum | Wholly owned subsidiary |  |  |  |  |
Common Share capital |  |  |  |  |
Cost of purchase of common shares related to normal course issuer bid | $ |  | $ 105 |  |  |

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