LEASES Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Amortization of assets, included in Depreciation and amortization expense	$ 2	$ 2	$ 4	$ 4
Interest on lease liabilities, included in Interest expense	1	1	2	2
Amortization of assets, included in Total operating expense	2	2	4	4
Interest on lease liabilities, included in Total operating expense	0	0	1	1
Total net lease cost	$ 5	$ 5	$ 11	$ 11