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EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS - Plan Assets Allocation (Details)
Dec. 31, 2020
Dec. 31, 2019
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS    
Percentage of plan assets 100.00% 100.00%
Cash and Cash Equivalents [Member]    
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS    
Percentage of plan assets 2.00% 3.00%
Debt Securities [Member]    
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS    
Percentage of plan assets 36.00% 38.00%
Equity Securities [Member]    
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS    
Percentage of plan assets 51.00% 49.00%
Alternative Funds [Member]    
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS    
Percentage of plan assets 11.00% 10.00%