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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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