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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%