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Share capital - Narrative (Details) $ in Millions |  |  | 3 Months Ended | 4 Months Ended
--- | --- | --- | --- | ---
Mar. 01, 2018 shares | Feb. 28, 2018 | Mar. 31, 2018 CAD ($) shares | Jun. 30, 2018
Disclosure of classes of share capital [line items] |  |  |  |
Stock repurchased during period (in shares) |  |  | 3,085,697 |
Value of stock repurchased during period | $ |  |  | $ 175 |
Series AC Convertible Preference Shares |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Dividend rate reset term |  |  |  | 5 years
SHARES ISSUED |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Value of stock repurchased during period | $ |  |  | 69 |
CONTRI-BUTED SURPLUS |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Value of stock repurchased during period | $ |  |  | 3 |
DEFICIT |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Value of stock repurchased during period | $ |  |  | $ 103 |
Major ordinary share transactions | Series AC Convertible Preference Shares |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Conversion of stock, shares converted (in shares) | 397,181 |  |  |
Number of shares outstanding (in shares) | 5,069,935 |  |  |
Share conversion ratio | 1 |  |  |
Annual dividend rate | 4.38% | 3.55% |  |
Major ordinary share transactions | Series AD Convertible Preference Shares |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Conversion of stock, shares converted (in shares) | 5,356,937 |  |  |
Number of shares outstanding (in shares) | 14,930,065 |  |  |
Share conversion ratio | 1 |  |  |

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