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Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 31	$ (1)	$ 67
State	(7)	(22)	(7)
Total current	24	(23)	60
Deferred:
Federal	47	(181)	(61)
State	18	(13)	(19)
Total deferred	65	(194)	(80)
Total income tax expense (benefit)	$ 89	$ (217)	$ (20)

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