INCOME TAXES (Uncertain Tax Position) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Total Gross Unrecognized Tax Benefits [Roll Forward]
Gross unrecognized tax benefits, beginning balance		$ 1	$ 1	$ 1	$ 1
Gross unrecognized tax benefits, ending balance			1	1	1
Total unrecognized tax benefits that, if recognized, would impact the effective tax rate			1	1	1
Total amount of interest and penalties (benefit) recognized in "Provision for income taxes"			$ (5)	$ (7)	$ (5)
Foreign Tax Authority [Member]
Reconciliation of Total Gross Unrecognized Tax Benefits [Roll Forward]
Increase (Decrease) in Income Taxes Payable	$ (40)	$ 40