Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits, beginning balance	$ 11	$ 48	$ 28
Additions for tax positions of prior years	0	0	27
Reductions for tax positions of prior years	0	(2)	(4)
Additions for tax positions related to the current year	0	1	1
Settlements	0	(30)	(3)
Lapse of statute of limitations	(1)	(6)	(1)
Unrecognized Tax Benefits, ending balance	$ 10	$ 11	$ 48