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PENSION AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Net periodic benefit costs:    
Employer contributions to pension plan $ 0 $ 0
Contributions deferred till December 2020 5,000,000  
Pension Benefit    
Net periodic benefit costs:    
Service cost 0 0
Interest cost 1,000,000 1,000,000
Expected return on plan assets 0 (1,000,000)
Recognized actuarial loss 0 1,000,000
Total 1,000,000 1,000,000
Postretirement Benefit    
Net periodic benefit costs:    
Service cost 1,000,000 1,000,000
Interest cost 1,000,000 1,000,000
Expected return on plan assets 0 0
Recognized actuarial loss 0 0
Total $ 2,000,000 $ 2,000,000