Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Discontinued operations components of earnings and balance sheet disclosure
Income (loss) from discontinued operations, net of tax	$ 13	$ 2	$ (4)	$ (71)	$ (26)	$ (2)	$ 2	$ 2	$ (60)	$ (24)	$ 1
Discontinued operations
Discontinued operations components of earnings and balance sheet disclosure
Transaction value	150								150
Total net revenues									382	467	412
Loss from discontinued operations									(124)	(40)
Gain on sale									26
Income tax provision (benefit)									(38)	(16)	(1)
Income (loss) from discontinued operations, net of tax									(60)	(24)	1
Assets:
Cash and cash equivalents					23					23
Receivables					40					40
Other assets					110					110
Total assets held for sale					173					173
Liabilities:
Long-term debt					5					5
Accounts payable and accrued expenses					26					26
Other liabilities					48					48
Total liabilities held for sale					79					79
Goodwill					48					48
Intangible assets					$ 8					$ 8