Income Taxes Schedule of Components of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 12	$ 4	$ 10
State and local	22	12	3
Current Income Tax Expense (Benefit)	34	16	13
Deferred:
Federal	(15)	61	23
State and local	(2)	9	14
deferred income tax expense	(17)	70	37
Income tax expense	$ 17	$ 86	$ 50