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BENEFIT PLANS - ADDITIONAL INFORMATION (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Employer matching contribution of first 1% of contribution 100.00%    
Employer matching contribution of next 5% of contribution 50.00%    
Employer maximum matching contribution 3.50%    
Defined contribution plan, cost recognized $ 36 $ 35 $ 35
Defined benefit plan, benefit obligation, period (increase) decrease for actuarial loss, discount rates $ 31 68  
Defined benefit plan, benefit obligation, period (increase) decrease for actuarial loss, discount rates, demographic assumptions   2  
Defined benefit plan, benefit obligation, period (increase) decrease for actuarial loss, discount rates, plan experience different than anticipated   $ 13  
Expected return on plan assets 4.00%    
Percentage of total plan assets categorized as level 1 75.00% 75.00%  
Expected contributions to defined benefit pension plans in 2020 $ 17    
Minimum | Defined Benefit Plan, Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation for plan asset of equity securities 30.00%    
Minimum | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation for plan asset of equity securities 30.00%    
Minimum | Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation for plan asset of equity securities 0.00%    
Minimum | Other Investments      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation for plan asset of equity securities 0.00%    
Maximum | Defined Benefit Plan, Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation for plan asset of equity securities 65.00%    
Maximum | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation for plan asset of equity securities 65.00%    
Maximum | Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation for plan asset of equity securities 15.00%    
Maximum | Other Investments      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation for plan asset of equity securities 25.00%    
Common Stock      
Defined Benefit Plan Disclosure [Line Items]      
ESOP target contribution 3.00%