Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Discontinued operations components of earnings and balance sheet disclosure
Loss from discontinued operations, net of tax	$ (1)	$ (71)
Discontinued operations
Discontinued operations components of earnings and balance sheet disclosure
Total net revenues		122
Loss from discontinued operations		(116)
Reduction of gain on sale	(2)
Income tax benefit	(1)	(45)
Loss from discontinued operations, net of tax	$ (1)	$ (71)