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Share Based Compensation - Summary of Stock Option Plans - (Details) CAD / shares in Units, shares in Thousands, Option in Thousands | 12 Months Ended
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Dec. 31, 2017 CAD Option CAD / shares shares | Dec. 31, 2016 CAD Option CAD / shares shares
Number of outstanding share options (shares) |  |
Outstanding, beginning of year | Option | 31,442 | 29,090
Granted | Option | 7,401 | 8,145
Exercised for cash payment | shares | (6) | (1,441)
Exercised as options for common shares | Option | (6,223) | (3,983)
Forfeited/expired | shares | (1,504) | (369)
Outstanding, end of year | Option | 31,110 | 31,442
Exercisable, end of year | Option | 17,363 | 17,821
Weighted average exercise price of share options ($ per share) |  |
Outstanding, beginning of year (in dollar per share) | CAD 35.98 | CAD 36.97
Granted | CAD 42.04 | CAD 30.26
Exercised for cash payment | CAD / shares | CAD 32.00 | CAD 30.39
Exercised as options for common shares | CAD 36.65 | CAD 33.36
Forfeited/expired | CAD / shares | CAD 42.21 | CAD 38.12
Outstanding, end of year (in dollar per share) | CAD 36.96 | CAD 35.98
Exercisable, end of year (in dollar per share) | 36.53 | 37.74
Weighted average share price | CAD 41.09 | CAD 36.23

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