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PENSION AND OTHER POSTRETIREMENT BENEFITS - ACTUARIAL ASSUMPTIONS (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension | Canada |  |  |
Projected benefit obligations (as percent) |  |  |
Discount rate | 3.00% | 3.80% | 3.60%
Rate of salary increase | 3.20% | 3.20% | 3.20%
Net benefit cost (as percent) |  |  |
Discount rate | 3.80% | 3.60% | 4.00%
Expected rate of return on plan assets | 7.00% | 6.80% | 6.50%
Rate of salary increase | 3.20% | 3.20% | 3.70%
Pension | United States |  |  |
Projected benefit obligations (as percent) |  |  |
Discount rate | 3.00% | 3.90% | 3.50%
Rate of salary increase | 2.90% | 2.80% | 3.10%
Net benefit cost (as percent) |  |  |
Discount rate | 3.90% | 3.40% | 4.00%
Expected rate of return on plan assets | 8.00% | 7.40% | 7.20%
Rate of salary increase | 2.90% | 2.90% | 3.30%
OPEB | Canada |  |  |
Projected benefit obligations (as percent) |  |  |
Discount rate | 3.10% | 3.80% | 3.60%
Net benefit cost (as percent) |  |  |
Discount rate | 3.80% | 3.60% | 4.00%
OPEB | United States |  |  |
Projected benefit obligations (as percent) |  |  |
Discount rate | 2.80% | 4.00% | 3.50%
Net benefit cost (as percent) |  |  |
Discount rate | 4.00% | 3.30% | 4.00%
Expected rate of return on plan assets | 6.70% | 5.70% | 6.00%

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