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Income Taxes - Income Tax (Benefit) Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ (63)	$ 96	$ 31
State	(5)	5	(7)
Total current	(68)	101	24
Deferred:
Federal	(1)	3	39
State	(26)	25	16
Total deferred	(27)	28	55
Total income tax (benefit) expense	$ (95)	$ 129	$ 79

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