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Income Taxes - Effective Tax Rate On Income Before Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Income tax (benefit) expense at statutory rate $ (398) $ 161 $ 45
State income tax, net of federal benefit (71) 31 8
Adjustment of net deferred tax liability from enacted tax rate change 0 0 (28)
Nondeductible expenses 5 8 5
Net operating loss carryback (73) 0 0
Foreign tax credit re-characterization (13) 0 0
Foreign rate differential 2 (3) (2)
Valuation allowance 10 0 0
Unrecognized tax benefit (3) 0 0
Other, net 2 2 2
Total income tax (benefit) expense $ (539) $ 199 $ 30