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EMPLOYEE BENEFIT PLANS - Asset allocation (Details) - Defined Benefit Pension Items | Dec. 31, 2021 | Dec. 31, 2020
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ASSET CATEGORY: |  |
Asset allocations | 100.00% | 100.00%
Cash and Cash Equivalents |  |
ASSET CATEGORY: |  |
Asset allocations | 0.10% | 1.20%
Domestic equities |  |
ASSET CATEGORY: |  |
Asset allocations | 12.10% | 10.60%
Mutual funds/ETFs |  |
ASSET CATEGORY: |  |
Asset allocations | 84.10% | 82.20%
International equities |  |
ASSET CATEGORY: |  |
Asset allocations | 0.30% | 0.00%
Corporate bonds |  |
ASSET CATEGORY: |  |
Asset allocations | 3.40% | 6.00%

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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=123447040&loc=d3e1928-114920 + Details
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