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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - CAD ($) $ / shares in Units, shares in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | May 31, 2017
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Interest costs capitalized | $ 82,000,000 | $ 233,000,000 | $ 244,000,000 |
Weighted average capitalization rate | 3.80% | 3.90% | 3.90% |
North America, Exploration and Production segment and Midstream segment |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Net cash consideration for acquisition of exploration and evaluation assets | $ 1,013,000,000 | $ 159,000,000 | $ 406,000,000 |
Asset retirement obligations | 63,000,000 | 30,000,000 | 133,000,000 |
Deferred tax liabilities | 0 | 0 | 0 |
North America |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Acquired exploration and evaluation assets | 27,000,000 | 0 | $ 37,000,000 |
Midstream |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Revaluation pre-tax gain | 114,000,000 |  |  |
Revaluation after-tax gain | $ 83,000,000 |  |  |
Pre-tax and after-tax gain on disposal of property, plant and equipment |  | 218,000,000 |  |
AOSP |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment |  |  |  | $ 14,181,000,000
Asset retirement obligations |  |  |  | 721,000,000
Deferred tax liabilities |  |  |  | 1,287,000,000
AOSP | Oil Sands Mining and Upgrading segment and North America Exploration and Production segment |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment |  |  |  | $ 14,181,000,000
Disposal of Cold Lake Pipeline |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Net proceeds on sale of property, plant and equipment |  | 349,000,000 |  |
Disposal of Cold Lake Pipeline | Inter Pipeline |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Non-cash share consideration received |  | $ 190,000,000 |  |
Non-cash share consideration received (in shares) |  | 6.4 |  |
Non-cash share consideration received, price per share (in CAD per share) |  | $ 29.57 |  |
Disposal of Cold Lake Pipeline | Midstream |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Disposals of property, plant and equipment |  | $ 321,000,000 |  |
Net consideration received, property, plant and equipment |  | 539,000,000 |  |
Pre-tax and after-tax gain on disposal of property, plant and equipment |  | $ 218,000,000 |  |

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