SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS 2 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Valuation And Qualifying Accounts Deferred Tax Assets Disclosure [Line Items]
Balance at end of period,	$ (591)	$ (636)
Deferred Tax Assets Valuation Allowance [Member]
Valuation And Qualifying Accounts Deferred Tax Assets Disclosure [Line Items]
Balance at beginning of period,	636	578	445
Additions charged to income tax expense	109	129	142
Reductions credited to income tax expense	(152)	(90)	(30)
Additions charged to equity	(13)	(17)	27
Reductions charged to deferred tax assets, due to expired NOL	(8)	(7)	3
Reductions charged to deferred tax assets, due to capital loss carryforwards	(5)	(1)	(9)
Additions charged to goodwill	24	44
Balance at end of period,	591	636	578
Allowance for Doubtful Accounts [Member]
Valuation And Qualifying Accounts Deferred Tax Assets Disclosure [Line Items]
Additions charged to income tax expense	$ 79	$ 145	$ 176