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Income Taxes Components of Income Tax (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current expense (benefit):
Federal	$ (20)	$ (8)	$ 54
State	(2)	19	(16)
Total	(22)	11	38
Deferred expense (benefit):
Federal	174	181	(2,055)
State	43	(188)	184
Total	217	(7)	(1,871)
Total income tax expense (benefit) from continuing operations	$ 195	$ 4	$ (1,833)

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