INCOME TAXES - Income Tax Expense (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Current income taxes: Federal taxes	$ 7	$ 18
Current income taxes: State taxes	2	2
Total current income taxes	9	20
Deferred income taxes: Federal taxes	2	2
Deferred income taxes: State taxes	0	0
Total deferred income taxes	2	2
Income taxes	$ 11	$ 22
Statutory tax rate	21.00%	21.00%
Effective tax rate	18.80%	19.30%

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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