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EMPLOYEE BENEFITS - Postretirement Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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 $ 5 $ 4
Interest cost 3 6 7
Expected return on assets (8) (8) (12)
Amortization of prior service credits (9) (10) (10)
Amortization of unrecognized gains (8) (5) (4)
Net periodic (benefits) costs (17) (12) (15)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 167 200  
Service cost 5 5 4
Interest cost 3 6 7
Plan participants' contributions 3 3  
Actuarial (gains)/losses (14) (38)  
Benefits paid (11) (9)  
Benefit obligation at end of year 153 167 200
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Plan assets available for benefits at beginning of year 206 198  
Actual returns on plan assets 9 14  
Plan participants' contributions 3 3  
Benefits paid (11) (9)  
Plan assets available for benefits at end of year 207 206 $ 198
Noncurrent postretirement benefit asset (obligation) 54 39  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]      
Prior service credit 42 51  
Unrecognized gains 90 83  
Deferred tax (liability) (33) (33)  
Net accumulated gains $ 99 $ 101  
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 6 months    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 2.17% 3.01% 4.08%
Long-term rate of return on plan assets – net of tax 4.04% 4.04% 7.13%
Pre age 65 5.81% 6.06% 6.31%
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, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rate 2.57% 2.17% 3.01%
Expected long-term rate of return on plan assets – net of tax 4.04% 4.04% 4.04%
Pre age 65 6.50% 5.81% 6.06%
Year ultimate healthcare cost trend rate reached 2030 2026 2026
HRA credit inflation index for grandfathered retirees 0.00% 0.00% 2.50%
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]      
2022 $ 8    
2023 9    
2024 9    
2025 10    
2026 10    
2027-2031 46    
Total $ 92