DEBT - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 3,461
Ending balance	3,019	$ 3,461
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(6)	0	$ 0
Other comprehensive loss before reclassifications	(15)	(6)	0
Reclassification to Income Statement	0	0	0
Net other comprehensive loss	(15)	(6)	0
Ending balance	$ (21)	$ (6)	$ 0