Income Taxes (Details 6) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of unrecognized income tax benefits
Unrecognized tax benefits, beginning of year	$ 0	$ 0
Additions for income tax positions related to current year	1	0
Additions for income tax positions related to prior year	3	2
Reductions for income tax positions related to settlements	0	(2)
Unrecognized tax benefits, end of year	4	0	$ 0
Unrecognized tax benefits that, if recognized, would impact the effective tax rate	0	0
Accrued interest and penalties	2
Maximum
Reconciliation of unrecognized income tax benefits
Recognized interest and penalties	$ (1)	1	$ (1)
Accrued interest and penalties		$ 1