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EMPLOYEE RETIREMENT PLANS - Schedule of weighted average asset allocation (Details)
Dec. 31, 2021
Dec. 31, 2020
Asset Category:    
Weighted Average Asset Allocation 100.00% 100.00%
Equity Securities [Member]    
Asset Category:    
Weighted Average Asset Allocation 60.00% 59.00%
Fixed Income Securities [Member]    
Asset Category:    
Weighted Average Asset Allocation 30.00% 32.00%
Other securities    
Asset Category:    
Weighted Average Asset Allocation 10.00% 9.00%