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EMPLOYEE BENEFITS - Postretirement Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
HRA credit inflation index for grandfathered retirees 4.50%    
Fixed Income Securities      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Target allocation, percentage 65.00%    
Equity Securities      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Target allocation, percentage 35.00%    
Postretirement Benefits      
Postretirement Benefits      
Service cost $ 5 $ 4 $ 6
Interest cost 6 7 7
Expected return on assets (8) (12) (13)
Amortization of prior service credits (10) (10) (10)
Amortization of unrecognized gains (5) (4) (3)
Net periodic (benefits) costs (12) (15) (13)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 200 190  
Service cost 5 4 6
Interest cost 6 7 7
Plan participants' contributions 3 3  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (38) 5  
Benefits paid (9) (9)  
Benefit obligation at end of year 167 200 190
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Plan assets available for benefits at beginning of year 198 176  
Actual returns on plan assets 14 28  
Plan participants' contributions 3 3  
Benefits paid (9) (9)  
Plan assets available for benefits at end of year 206 198 $ 176
Assets for Plan Benefits, Defined Benefit Plan (39)    
Noncurrent postretirement benefit obligation   2  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]      
Prior service credit 51 61  
Unrecognized gains 83 44  
Deferred tax (liability) (33) (26)  
Net accumulated gains $ 101 $ 79  
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]      
Net unrecognized gains (losses), amortization period 10 years 10 months 24 days    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 3.01% 4.08% 3.44%
Long-term rate of return on plan assets, net of tax 4.00% 7.13% 7.13%
Pre age 65 6.06% 6.31% 6.56%
Catastrophic drug benefit     12.50%
Ultimate healthcare cost trend rate 4.50% 4.50% 4.50%
Year ultimate healthcare cost trend rate reached 2026 2026 2026
HRA credit inflation index for grandfathered retirees 2.50% 2.50% 2.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rate 2.17% 3.01% 4.08%
Expected long-term rate of return on plan assets, net of tax 4.00% 4.00% 7.13%
Pre age 65 5.81% 6.06% 6.31%
Catastrophic drug benefit     11.50%
Ultimate healthcare cost trend rate 4.50% 4.50% 4.50%
Year ultimate healthcare cost trend rate reached 2026 2026 2026
HRA credit inflation index for grandfathered retirees 0.00% 2.50% 2.50%
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]      
2021 $ 9    
2022 9    
2023 10    
2024 10    
2025 10    
2026-2030 47    
Total $ 95