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Acquisition Of Canadian Oil Sands Limited (Details) CAD / shares in Units, item in Millions, CAD in Millions | Feb. 05, 2016 CAD item CAD / shares shares | Jun. 23, 2016 | Mar. 21, 2016 CAD item shares | Feb. 22, 2016 item shares
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COS |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Percentage of voting equity interests acquired | 73.00% |  |  |
Purchase Price Consideration |  |  |  |
Number of common shares tendered (millions) | 353,300,000 |  | 131,300,000 | 131,300,000
Multiplied by share exchange ratio | 0.28 |  |  |
Number of Suncor common shares issued | item | 98.9 |  | 36.7 | 36.7
Share price on acquisition date | CAD / shares | CAD 31.88 |  |  |
Fair value of consideration ($ millions) | CAD | CAD 3,154.0 |  | CAD 4,452.0 |
Syncrude |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Percentage of voting equity interests acquired |  | 53.74% |  |
Equity interest percentage held | 36.74% |  |  |

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