LEASES Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Amortization of assets, included in Depreciation and amortization expense	$ 2	$ 2
Interest on lease liabilities, included in Interest expense	1	1
Amortization of assets, included in Total operating expense	2	2
Interest on lease liabilities, included in Total operating expense	1	1
Total net lease cost	$ 6	$ 6