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Share capital (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 CAD ($) shares
Disclosure of classes of share capital [line items] |
Stock repurchased during period (in shares) | shares | 3,085,697
Value of stock repurchased during period | $ 175
Stated capital |
Disclosure of classes of share capital [line items] |
Value of stock repurchased during period | 69
Contributed 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

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