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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - CAD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 29, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
PROPERTY, PLANT AND EQUIPMENT |  |  |  |
Depreciation expense |  | $ 2,900 | $ 2,900 | $ 2,000
Impairment loss |  | $ 1,104 | $ 4,463 | 1,376
Northern Gateway Project |  |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |  |
Impairment loss | $ 373 |  |  |
Impairment loss, after-tax | $ 272 |  |  |
Sandpiper Project |  |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |  |
Impairment loss |  |  |  | 992
Impairment loss, after-tax |  |  |  | 81
Land | Sandpiper Project |  |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |  |
Estimated fair value |  |  |  | 3
Non-core trucking assets and related facilities | EEP |  |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |  |
Impairment charges |  |  |  | $ 11

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