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EMPLOYEE BENEFITS - Postretirement Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Aug. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Profit Sharing Automatic Contribution By Employer, Percentage   3.00%    
Postretirement benefit plan re-measurement, net of tax $ 29      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Actuarial (gains) $ (76)      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]        
HRA credit inflation index for grandfathered retirees   2.50%    
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]        
Pension and Other Postretirement Benefits Cost (Reversal of Cost)   $ 113 $ 164 $ 120
Defined Contribution Plan, Cost   19 13 18
Postretirement Benefits [Member]        
Postretirement Benefits        
Service cost   4 6 7
Interest cost   7 7 8
Expected return on assets   (12) (13) (12)
Amortization of prior service credits   (10) (10) (7)
Amortization of unrecognized gains   (4) (3) (2)
Net periodic (benefits) costs   (15) (13) (6)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit obligation at beginning of year   190 208  
Service cost   4 6 7
Interest cost   7 7 8
Plan participants' contributions   3 3  
Plan amendment   5 (26)  
Benefits paid   (9) (9)  
Prescription drug rebates   0 1  
Benefit obligation at end of year   200 190 $ 208
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Prescription drug rebates   0 1  
Noncurrent postretirement benefit obligation   2 14  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]        
Prior service credit   61 71  
Unrecognized gains   44 37  
Deferred tax (liability)   (26) (26)  
Net accumulated gains   $ 79 $ 82  
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   11 years 1 month 6 days    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Discount rate   4.08% 3.44% 4.00%
Long-term rate of return on plan assets, net of tax   7.13% 7.13% 7.13%
Pre age 65   6.31% 6.56% 6.81%
Post age 65       9.36%
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%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]        
Discount rate   3.01% 4.08% 3.44%
Expected 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     11.50% 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, Estimated Future Benefit Payments [Abstract]        
2020   $ 9    
2021   10    
2022   11    
2023   12    
2024   12    
2025-2029   62    
Total   116    
Postretirement Benefits [Member] | Vanguard Federal Money Market Fund [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Plan assets available for benefits at beginning of year   0    
Plan assets available for benefits at end of year   109 $ 0  
Postretirement Benefits [Member] | Fidelity Government Money Market Fund [Domain] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Plan assets available for benefits at beginning of year   0    
Plan assets available for benefits at end of year   95 0  
Postretirement Benefits [Member] | Fidelity Spartan US Equity Index Fund [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Plan assets available for benefits at beginning of year   80    
Plan assets available for benefits at end of year   0 80  
Postretirement Benefits [Member] | Vanguard 500 Index Fund [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Plan assets available for benefits at beginning of year   93    
Plan assets available for benefits at end of year   0 93  
Postretirement Benefits [Member] | Vanguard Total International Stock Member | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Plan assets available for benefits at beginning of year   26    
Plan assets available for benefits at end of year   0 26  
Postretirement Benefits [Member] | Total Registered Investment Companies [Member]        
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Less: trust liabilities   (6) (23)  
Postretirement Benefits [Member] | Total Registered Investment Companies [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Plan assets available for benefits at beginning of year   199    
Plan assets available for benefits at end of year   204 199  
Postretirement Benefits [Member] | Plan Assets [Member]        
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Prescription drug rebates   0 1  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Plan assets available for benefits at beginning of year   176 189  
Actual (losses) returns on plan assets   28 (8)  
Plan participants' contributions   3 3  
Benefits paid   (9) (9)  
Prescription drug rebates   0 1  
Plan assets available for benefits at end of year   $ 198 $ 176 $ 189
Minimum [Member]        
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]        
Profit Sharing Contribution Percentage   8.00%    
Maximum [Member]        
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]        
Profit Sharing Contribution Percentage   18.00%