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Income Taxes Components of Income Tax (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current expense (benefit):
Federal	$ (8)	$ 54	$ (47)
State	19	(16)	(34)
Total	11	38	(81)
Deferred expense (benefit):
Federal	181	(2,055)	(189)
State	(188)	184	12
Total	(7)	(1,871)	(177)
Total income tax expense (benefit) from continuing operations	$ 4	$ (1,833)	$ (258)

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