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PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Target Allocation and Actual Asset Allocations for Pension and VEBA Plan Assets (Details) | Dec. 31, 2020 | Dec. 31, 2019
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Pension Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 100.00% | 100.00%
Target Allocation, Percentage, Next Fiscal Year | 100.00% |
Pension Plan [Member] | Equity Securities [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 51.80% | 44.00%
Target Allocation, Percentage, Next Fiscal Year | 41.30% |
Pension Plan [Member] | Fixed Income Investments [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 33.80% | 27.60%
Target Allocation, Percentage, Next Fiscal Year | 39.70% |
Pension Plan [Member] | Hedge Funds [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 2.20% | 5.40%
Target Allocation, Percentage, Next Fiscal Year | 5.00% |
Pension Plan [Member] | Private Equity Funds [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 2.10% | 6.60%
Target Allocation, Percentage, Next Fiscal Year | 2.20% |
Pension Plan [Member] | Structured Finance [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 5.00% | 7.00%
Target Allocation, Percentage, Next Fiscal Year | 5.20% |
Pension Plan [Member] | Real Estate [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 3.30% | 9.40%
Target Allocation, Percentage, Next Fiscal Year | 5.20% |
Pension Plan [Member] | Absolute return fixed income |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 1.80% | 0.00%
Target Allocation, Percentage, Next Fiscal Year | 1.40% |
Other Postretirement Benefits Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 100.00% | 100.00%
Target Allocation, Percentage, Next Fiscal Year | 100.00% |
Other Postretirement Benefits Plan [Member] | Equity Securities [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 22.20% | 7.20%
Target Allocation, Percentage, Next Fiscal Year | 20.30% |
Other Postretirement Benefits Plan [Member] | Fixed Income Investments [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 66.40% | 79.80%
Target Allocation, Percentage, Next Fiscal Year | 69.60% |
Other Postretirement Benefits Plan [Member] | Hedge Funds [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 1.80% | 4.80%
Target Allocation, Percentage, Next Fiscal Year | 1.10% |
Other Postretirement Benefits Plan [Member] | Private Equity Funds [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 0.40% | 0.70%
Target Allocation, Percentage, Next Fiscal Year | 1.40% |
Other Postretirement Benefits Plan [Member] | Structured Finance [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 0.90% | 2.10%
Target Allocation, Percentage, Next Fiscal Year | 1.00% |
Other Postretirement Benefits Plan [Member] | Real Estate [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 1.80% | 5.40%
Target Allocation, Percentage, Next Fiscal Year | 1.10% |
Other Postretirement Benefits Plan [Member] | Absolute return fixed income |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 6.50% | 0.00%
Target Allocation, Percentage, Next Fiscal Year | 5.50% |

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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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