Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Discontinued operations components of earnings and balance sheet disclosure
Loss from discontinued operations, net of tax	$ (2)	$ 1	$ (1)	$ (1)	$ 1	$ (1)	$ (1)	$ (1)	$ (3)	$ (2)	$ (60)
Discontinued operations
Discontinued operations components of earnings and balance sheet disclosure
Total net revenues									0	0	382
Income (loss) from discontinued operations									(4)	2	(124)
Gain on sale									(1)	(7)	26
Income tax expense (benefit)									(2)	(3)	(38)
Loss from discontinued operations, net of tax									$ (3)	$ (2)	$ (60)