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EMPLOYEE RETIREMENT PLANS - Qualified Defined-benefit Pension Plan Weighted Average Asset Allocation (Details) - Qualified	Dec. 31, 2020	Dec. 31, 2019
Plan Assets
Weighted average asset allocation (as a percent)	100.00%	100.00%
Equity securities
Plan Assets
Weighted average asset allocation (as a percent)	15.00%	41.00%
Debt securities
Plan Assets
Weighted average asset allocation (as a percent)	49.00%	54.00%
Other
Plan Assets
Weighted average asset allocation (as a percent)	36.00%	5.00%

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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=118255775&loc=d3e1928-114920

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