Income Taxes Schedule of Components of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 4	$ 20	$ 10
State and local	1	2	0
Current Income Tax Expense (Benefit)	5	22	10
Deferred:
Federal	26	26	4
State and local	14	13	7
deferred income tax expense	40	39	11
Income tax expense	$ 45	$ 61	$ 21