INCOME TAXES Income Taxes - Effective Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Computed statutory income tax expense at 35%	$ 40	$ 33	$ (108)
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount	(17)	0	0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	0	0	(249)
State income taxes, net of federal income tax benefit	5	14	1
Non-deductible goodwill impairment	0	0	92
Other	(2)	2	1
Total income tax expense (benefit)	(402)	49	(263)
Effective Income Tax Rate Reconciliation, Change in Tax Status of Subsidiary	$ (428)	$ 0	$ 0