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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, 2019 | Dec. 31, 2018
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Canada |  |
Pension and Other Postretirement Benefit Disclosures |  |
Projected benefit obligations | $ 1,481 | $ 1,422
Accumulated benefit obligations | 1,361 | 1,299
Fair value of plan assets | 1,087 | 1,064
United States |  |
Pension and Other Postretirement Benefit Disclosures |  |
Projected benefit obligations | 103 | 1,214
Accumulated benefit obligations | 98 | 1,179
Fair value of plan assets | $ 0 | $ 1,045

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