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EMPLOYEE BENEFIT PLANS - Asset allocation (Details) - Defined Benefit Pension Items
Dec. 31, 2023
Dec. 31, 2022
ASSET CATEGORY:    
Asset allocations 100.00% 100.00%
Cash and Cash Equivalents    
ASSET CATEGORY:    
Asset allocations 2.40% 89.90%
Domestic securities    
ASSET CATEGORY:    
Asset allocations 3.40% 7.10%
Mutual funds/ETFs    
ASSET CATEGORY:    
Asset allocations 94.20% 0.00%
Corporate bonds    
ASSET CATEGORY:    
Asset allocations 0.00% 3.00%