Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Discontinued operations components of earnings and balance sheet disclosure
Loss from discontinued operations, net of tax	$ (1)	$ (4)	$ (2)	$ (75)
Discontinued operations
Discontinued operations components of earnings and balance sheet disclosure
Total net revenues		118		240
Loss from discontinued operations		(3)		(119)
Reduction of gain on sale	(1)		(3)
Income tax expense (benefit)		1	(1)	(44)
Loss from discontinued operations, net of tax	$ (1)	$ (4)	$ (2)	$ (75)