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ACQUISITION OF INTERESTS IN THE ATHABASCA OIL SANDS PROJECT AND OTHER ASSETS - Narrative (Details) shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2015 CAD ($) | May 31, 2017 USD ($) shares | May 31, 2017 CAD ($) shares
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Borrowings | $ 22,458,000,000 | $ 16,805,000,000 |  |  |
Revenue | 16,651,000,000 | $ 10,523,000,000 | $ 12,363,000,000 |  |
Non-revolving term credit facility maturing May 2020 |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Borrowings | 3,000,000,000 |  |  |  |
Non-revolving term loan facility | 3,000,000,000 |  |  |  |
AOSP |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Interest acquired |  |  |  | 70.00% | 70.00%
Total purchase consideration |  |  |  |  | $ 12,541,000,000
Cash transferred |  |  |  |  | $ 8,217,000,000
Common shares issued (in shares) | shares |  |  |  | 97.6 | 97.6
Fair value of share considerations issued | 3,818,000,000 |  |  |  | $ 3,818,000,000
Deferred purchase consideration payable |  |  |  | $ 375 | 506,000,000
Gain on acquisition, net of transaction costs | 230,000,000 |  |  |  |
Acquisition related transaction costs | 3,000,000 |  |  |  |
Revenue attributable to acquisition | 2,872,000,000 |  |  |  |
Revenue | 16,651,000,000 |  |  |  |
Net operating income attributable to acquisition | 1,166,000,000 |  |  |  |
Net operating income | 8,138,000,000 |  |  |  |
Pro forma revenue attributable to acquiree | 2,181,000,000 |  |  |  |
Pro forma revenue as if combination occurred at beginning of period | 18,832,000,000 |  |  |  |
Pro forma net operating income attributable to acquiree | 735,000,000 |  |  |  |
Pro forma net operating income as if combination occurred at beginning of period | $ 8,873,000,000 |  |  |  |
AOSP | Medium-term notes |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Borrowings |  |  |  |  | 1,800,000,000
AOSP | Long-term debt |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Borrowings |  |  |  | $ 3,000 |
AOSP | Non-revolving term credit facility maturing May 2020 |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Non-revolving term loan facility |  |  |  |  | $ 3,000,000,000
AOSP, Mining And Extraction Operations |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Interest acquired |  |  |  | 70.00% | 70.00%
AOSP, Scotford Upgrader And Quest Carbon Capture And Storage Project |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Interest acquired |  |  |  | 70.00% | 70.00%
AOSP, Peace River Thermal In Situ Operations And Cliffdale Heavy Oil Field |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Interest acquired |  |  |  | 100.00% | 100.00%

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