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PENSION AND OTHER POSTRETIREMENT BENEFITS - AMOUNT RECOGNIZED IN EXCESS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Canada |  |
Pension and Other Postretirement Benefit Disclosures |  |
Projected benefit obligations | $ 4,434 | $ 1,481
Accumulated benefit obligations | 4,094 | 1,361
Fair value of plan assets | 3,621 | 1,087
Canada | OPEB |  |
Pension and Other Postretirement Benefit Disclosures |  |
Accumulated benefit obligations | 321 | 293
Fair value of plan assets | 0 | 0
United States |  |
Pension and Other Postretirement Benefit Disclosures |  |
Projected benefit obligations | 1,243 | 103
Accumulated benefit obligations | 1,207 | 98
Fair value of plan assets | 1,062 | 0
United States | OPEB |  |
Pension and Other Postretirement Benefit Disclosures |  |
Accumulated benefit obligations | 191 | 288
Fair value of plan assets | $ 106 | $ 188

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