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PENSION AND OTHER POSTRETIREMENT BENEFITS - RETIREMENT SAVINGS PLAN (Details) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Canada |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Percent of match | 5.00% |  |
Total contributions by the Company | $ 13,000,000 | $ 14,000,000 | $ 0
United States |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Percent of match | 6.00% |  |
Total contributions by the Company | $ 27,000,000 | $ 31,000,000 | $ 13,000,000

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