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EMPLOYEE BENEFIT PLANS AND POSTRETIREMENT BENEFITS - Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Pension        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 6 $ 7 $ 12 $ 13
Interest cost 19 18 38 36
Expected return on assets (25) (29) (50) (57)
Amortization of:        
Prior service credit 0 (1) 0 (1)
Actuarial loss 17 19 34 38
Net periodic benefit cost 17 14 34 29
Healthcare        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 2 1 3 3
Interest cost 4 5 8 14
Expected return on assets (2) (2) (4) (4)
Amortization of:        
Prior service credit (30) (20) (60) (21)
Actuarial loss 0 1 0 3
Net periodic benefit cost (26) (15) (53) (5)
Other        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 3 4 6 8
Interest cost 1 0 2 1
Expected return on assets 0 0 0 0
Amortization of:        
Prior service credit 1 0 1 0
Actuarial loss 0 1 0 1
Net periodic benefit cost $ 5 $ 5 $ 9 $ 10