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INCOME TAXES - UNITED STATES TAX REFROM (Details) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |
Provisional tax expense | $ 223 | $ 30 |  | $ 34 |
United States BEAT tax |  |  | $ 43 | 0 | $ 0
Impact of United States tax reform |  |  | $ 2 | 2,045 | 0
Deferred income tax provision |  |  |  | 3,100 |
Deferred income tax asset benefit |  |  |  | $ 1,100 |
Reduction in tax amount |  |  |  |  | $ 200

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