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Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 41	$ 46	$ 1
State	7	1	0
Total	48	47	1
Deferred:
Federal	(3)	12	38
State	4	3	5
Revaluation due to state legislative changes	0	(40)	(1)
Total Deferred	1	(25)	42
Total	$ 49	$ 22	$ 43

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