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INCOME TAXES - EFFECTIVE INCOME TAX RECONCILIATION (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
U.S. federal tax rate | 21.00% | 35.00% | 35.00%
Income before income tax | $ 1,016 | $ 585 | $ 1,159
Expected tax expense | 213 | 123 | 406
Nondeductible expenses | 9 | 9 | 5
State income taxes | 36 | 21 | 28
State income sourcing | 1 | 0 | 9
Tax law changes | (9) | (7) | (237)
Other—net | (3) | 2 | (12)
Income tax expense | $ 247 | $ 148 | $ 199
Effective tax rate | 24.30% | 25.30% | 17.20%

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