Income Taxes (Details 6) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of unrecognized income tax benefits
Unrecognized tax benefits, beginning of year	$ 2	$ 0	$ 7
Additions for income tax positions related to prior year	0	2	0
Reductions for income tax positions related to prior year	0	0	(7)
Reductions for income tax positions related to settlements	(2)	0	0
Unrecognized tax benefits, end of year	0	2	0
Unrecognized tax benefits that, if recognized, would impact the effective tax rate	0	2	0
Recognized interest and penalties		(5)
Accrued interest and penalties			5
Maximum
Reconciliation of unrecognized income tax benefits
Recognized interest and penalties	(1)		(1)
Accrued interest and penalties	$ 1	$ 1