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INCOME TAXES - EFFECTIVE INCOME TAX RECONCILIATION (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |
U.S. federal tax rate | 21.00% | 35.00% | 35.00%
Income before income tax | $ 629 | $ (1,840) | $ 1,016
Expected tax expense | 132 | (386) | 213
Nondeductible expenses | 10 | 9 | 9
State income taxes | 20 | (62) | 36
Valuation allowance | 1 | 18 | 0
Tax law changes | (14) | (93) | (9)
Other—net | 2 | (2) | (2)
Income tax (benefit) expense | $ 151 | $ (516) | $ 247
Effective tax rate | 24.00% | 28.00% | 24.30%

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