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Share Based Compensation - Summary of Stock Option Plans - (Details) $ / shares in Units, shares in Thousands, Option in Thousands | 12 Months Ended
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Dec. 31, 2018 CAD ($) Option $ / shares shares | Dec. 31, 2017 CAD ($) Option $ / shares shares
Number of outstanding share options (shares) |  |
Outstanding, beginning of year | Option | 31,110 | 31,442
Granted | Option | 7,231 | 7,401
Exercised for cash payment | shares |  | (6)
Exercised as options for common shares | Option | (7,927) | (6,223)
Forfeited/expired | shares | (1,479) | (1,504)
Outstanding, end of year | Option | 28,935 | 31,110
Exercisable, end of year | Option | 15,374 | 17,363
Weighted average exercise price of share options ($ per share) |  |
Outstanding, beginning of year (in dollar per share) | $ 36.96 | $ 35.98
Granted | 43.19 | $ 42.04
Exercised for cash payment | $ / shares |  | $ 32.00
Exercised as options for common shares | $ 35.95 | $ 36.65
Forfeited/expired | $ / shares | $ 47.88 | $ 42.21
Outstanding, end of year (in dollar per share) | $ 38.25 | $ 36.96
Exercisable, end of year (in dollar per share) | 36.10 | 36.53
Weighted average share price | $ 46.99 | $ 41.09

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