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PENSION AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net periodic benefit costs:        
Employer contributions to pension plan $ 6 $ 1 $ 8 $ 6
Pension Benefit        
Net periodic benefit costs:        
Service cost     1 1
Interest cost   1 1 2
Expected return on plan assets (1) (1) (2) (2)
Recognized actuarial loss 1   1 1
Settlement loss   1 4 4
Net periodic benefit costs   1 5 6
Postretirement Benefit        
Net periodic benefit costs:        
Service cost 1 1 3 3
Interest cost 1 1 3 3
Net periodic benefit costs $ 2 $ 2 $ 6 $ 6