ACCUMULATED OTHER COMPREHENSIVE LOSS (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,368	$ 1,798	$ 2,301
Net other comprehensive income	45	(32)	(92)
Ending balance	1,915	1,368	1,798
Pension and other postretirement benefit plans	45	(32)	(92)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(59)	(62)	(61)
Other comprehensive income (loss) before reclassifications	2	0	(1)
Amounts reclassified from AOCL	0	3	0
Net other comprehensive income	2	3	(1)
Reclassification of stranded tax effects 1	0
Ending balance	(57)	(59)	(62)
Pension and Other Postretirement Benefits
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,293)	(1,258)	(1,167)
Other comprehensive income (loss) before reclassifications	(22)	(83)	(133)
Amounts reclassified from AOCL	65	48	42
Net other comprehensive income	43	(35)	(91)
Reclassification of stranded tax effects 1	(254)
Ending balance	(1,504)	(1,293)	(1,258)
Pension and other postretirement benefit plans	(13)	(3)	54
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,352)	(1,320)	(1,228)
Other comprehensive income (loss) before reclassifications	(20)	(83)	(134)
Amounts reclassified from AOCL	65	51	42
Net other comprehensive income	45	(32)	(92)
Reclassification of stranded tax effects 1	(254)
Ending balance	(1,561)	(1,352)	(1,320)
Pension and other postretirement benefit plans	$ 45	$ (32)	$ (92)