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INCOME TAXES - Income Tax Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Current income taxes: Federal taxes	$ 9	$ 6	$ 27	$ 23
Current income taxes: State taxes	1	1	3	3
Total current income taxes	10	7	30	26
Deferred income taxes: Federal taxes	13	13	15	15
Deferred income taxes: State taxes	1	1	1	1
Total deferred income taxes	14	14	16	16
Income taxes	$ 24	$ 21	$ 46	$ 42
Statutory tax rate	21.00%	21.00%	21.00%	21.00%
Effective tax rate	19.70%	19.40%	19.50%	19.50%

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