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ACQUISITION OF INTERESTS IN THE ATHABASCA OIL SANDS PROJECT AND OTHER ASSETS - Summary of Net Assets Acquired and Liabilities Assumed (Details) - AOSP - CAD ($) $ in Millions | May 31, 2017 | Dec. 31, 2017
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Disclosure of detailed information about business combination [line items] |  |
Cash | $ 93 |
Other working capital | 291 | $ 291
Property, plant and equipment | 14,181 |
Exploration and evaluation assets | 290 |
Asset retirement obligations | (721) |
Other long-term liabilities | (73) |
Deferred income taxes | (1,287) |
Net assets acquired | 12,774 |
Total purchase consideration | 12,541 |
Gain on acquisition before transaction costs | $ 233 |

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