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Share-Based Compensation - Stock Appreciation Rights - (Details) CAD / shares in Units, shares in Thousands, EquityInstruments in Thousands | 12 Months Ended
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Dec. 31, 2017 CAD EquityInstruments CAD / shares shares | Dec. 31, 2016 CAD EquityInstruments CAD / shares shares
Suncor Energy Inc. SARs |  |
Share based compensation |  |
Option term (expiration period) | 7 years |
Vesting period | 3 years |
Legacy Petro Canada SARs |  |
Share based compensation |  |
Option term (expiration period) | 7 years |
Vesting period | 4 years |
Number Of Outstanding Share Options [Abstract] |  |
Outstanding, beginning of year | EquityInstruments | 485 | 957
Granted | EquityInstruments | 107 | 142
Exercised | EquityInstruments | (176) | (610)
Forfeited/expired | shares | (29) | (4)
Outstanding, end of year | EquityInstruments | 387 | 485
Exercisable, end of year | EquityInstruments | 162 | 240
Weighted average exercise price of share options ($ per share) |  |
Weighted average exercise price Outstanding, beginning of year | CAD | CAD 34.90 | CAD 27.98
Weighted average exercise price, Granted | CAD | 42.05 | 30.23
Weighted average exercise price, Exercised | CAD | CAD 35.59 | CAD 23.07
Weighted average exercise price, Forfeited/expired | CAD / shares | CAD 37.32 | CAD 19.44
Weighted average exercise price, Outstanding, end of year | CAD | CAD 36.38 | CAD 34.90
Weighted average exercise price, Exercisable, end of year | CAD | CAD 35.39 | CAD 36.29

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