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PENSION AND OTHER POSTRETIREMENT BENEFITS - ACTUARIAL ASSUMPTIONS (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pension | Canada |  |  |
Projected benefit obligation |  |  |
Discount rate | 3.20% | 2.60% | 3.00%
Rate of salary increase | 2.90% | 2.30% | 3.20%
Net periodic benefit cost |  |  |
Discount rate | 2.60% | 3.00% | 3.80%
Rate of return on plan assets | 6.20% | 6.80% | 7.00%
Rate of salary increase | 2.30% | 3.20% | 3.20%
Pension | United States |  |  |
Projected benefit obligation |  |  |
Discount rate | 2.60% | 2.20% | 3.00%
Rate of salary increase | 2.80% | 2.70% | 2.90%
Cash balance interest credit rate | 4.30% | 4.30% | 4.50%
Net periodic benefit cost |  |  |
Discount rate | 2.20% | 3.00% | 3.90%
Rate of return on plan assets | 7.30% | 7.90% | 8.00%
Rate of salary increase | 2.70% | 2.90% | 2.90%
Cash balance interest credit rate | 4.30% | 4.50% | 4.50%
OPEB | Canada |  |  |
Projected benefit obligation |  |  |
Discount rate | 3.20% | 2.60% | 3.10%
Net periodic benefit cost |  |  |
Discount rate | 2.60% | 3.10% | 3.80%
OPEB | United States |  |  |
Projected benefit obligation |  |  |
Discount rate | 2.40% | 2.00% | 2.80%
Net periodic benefit cost |  |  |
Discount rate | 2.00% | 2.80% | 4.00%
Rate of return on plan assets | 6.00% | 6.70% | 6.70%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted-average interest crediting rate used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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