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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension Benefits      
Net periodic benefit costs:      
Service cost - benefits earned during the period $ 6 $ 7 $ 7
Interest cost on projected benefit obligation 17 18 18
Expected return on plan assets (24) (24) (27)
Recognized actuarial loss 10 12 10
Other costs and adjustments 3 4 (4)
Net periodic benefit cost 12 17 4
Amounts that will be amortized from AOCI into net periodic benefit cost over the next fiscal year      
Estimated net loss that will be amortized from AOCI into net periodic benefit cost over the next fiscal year 5    
Estimated prior service cost that will be amortized from AOCI into net periodic benefit cost over the next fiscal year 0    
Postretirement Benefits      
Net periodic benefit costs:      
Service cost - benefits earned during the period 21 20 26
Interest cost on projected benefit obligation 38 39 40
Recognized actuarial loss 14 15 27
Other costs and adjustments 1   1
Net periodic benefit cost 74 $ 74 $ 94
Amounts that will be amortized from AOCI into net periodic benefit cost over the next fiscal year      
Estimated net loss that will be amortized from AOCI into net periodic benefit cost over the next fiscal year 17    
Estimated prior service cost that will be amortized from AOCI into net periodic benefit cost over the next fiscal year $ 1