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EMPLOYEE BENEFITS - Postretirement Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Aug. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Profit Sharing Automatic Contribution By Employer, Percentage   3.00%    
Decrease in postretirement benefit obligation $ 76      
Postretirement benefit plan re-measurement, net of tax 29      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Plan amendment $ (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)   $ 164 $ 120 $ 84
Defined Contribution Plan, Cost   13 18 12
Postretirement Benefits [Member]        
Decrease in postretirement benefit obligation     34  
Postretirement Benefits        
Service cost   6 7 8
Interest cost   7 8 10
Expected return on assets   (13) (12) (10)
Amortization of prior service credits   (10) (7) (7)
Amortization of unrecognized gains   (3) (2) 0
Net periodic (benefits) costs   (13) (6) 1
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit obligation at beginning of year   208 265  
Service cost   6 7 8
Interest cost   7 8 10
Plan participants' contributions   3 3  
Actuarial (gains)   (26) (34)  
Plan amendment     (34)  
Benefits paid   (9) (9)  
Prescription drug rebates   1 2  
Benefit obligation at end of year   190 208 $ 265
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Prescription drug rebates   1 2  
Noncurrent postretirement benefit obligation   14 19  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]        
Prior service credit   71 80  
Unrecognized gains   37 37  
Deferred tax (liability)   (26) (44)  
Net accumulated gains   $ 82 $ 73  
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   12 years 10 months 12 days    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Discount rate   3.44% 4.00% 4.20%
Long-term rate of return on plan assets, net of tax   7.13% 7.13% 6.65%
Pre age 65   6.56% 6.81% 7.00%
Post age 65     9.36% 7.00%
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%    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]        
Discount rate   4.08% 3.44% 4.00%
Expected 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   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%  
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]        
Estimated gross benefit payments, 2019   $ 8    
Estimated gross benefit payments, 2020   9    
Estimated gross benefit payments, 2021   10    
Estimated gross benefit payments, 2022   11    
Estimated gross benefit payments, 2023   12    
Estimated gross benefit payments, 2024-2028   66    
Postretirement Benefits [Member] | Plan Assets [Member]        
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Prescription drug rebates   1 $ 1  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Plan assets available for benefits at beginning of year   189 164  
Actual (losses) returns on plan assets   (8) 29  
Plan participants' contributions   3 3  
Benefits paid   (9) (8)  
Prescription drug rebates   1 1  
Plan assets available for benefits at end of year   176 189 $ 164
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   83    
Plan assets available for benefits at end of year   80 83  
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   104    
Plan assets available for benefits at end of year   93 104  
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   30    
Plan assets available for benefits at end of year   26 30  
Postretirement Benefits [Member] | Total Registered Investment Companies [Member]        
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Trust liabilities   (23) (28)  
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   217    
Plan assets available for benefits at end of year   $ 199 $ 217  
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%