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PENSION AND OTHER POSTRETIREMENT BENEFITS PENSION AND OTHER POSTRETIREMENT BENEFITS - AMOUNT RECOGNIZED IN EXCESS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Canada |  |
Pension and Other Postretirement Benefit Disclosures |  |
Projected benefit obligations | $ 1,422 | $ 1,444
Accumulated benefit obligations | 1,299 | 1,306
Fair value of plan assets | 1,064 | 1,131
United States |  |
Pension and Other Postretirement Benefit Disclosures |  |
Projected benefit obligations | 1,214 | 1,280
Accumulated benefit obligations | 1,179 | 1,217
Fair value of plan assets | $ 1,045 | $ 1,098

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