Income Taxes (Textuals) (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Intraperiod income tax [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Domestic		$ 7,300,000,000
Income Tax Expense (Benefit) [Abstract]
Deferred income tax liability, net of current		9,000,000	42,000,000	(86,000,000)
Federal statutory tax expense (benefit) rate		35.00%	(35.00%)	(35.00%)
Income Tax Disclosure (Textuals) [Abstract]
One time tax benefit from consolidation	76,000,000
Unrecognized Tax Benefits		92,000,000	74,000,000	88,000,000	98,000,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		36,000,000
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward		56,000,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		24,000,000
Cancellation of Debt Income Related to Stock Distribution			66,000,000
Cancellation of Debt Income Related to Stock Distribution for State Income Tax Purposes			39,000,000
Operating Loss Carryforwards		7,300,000,000
Operating Loss Carryforwards Available To Offset Future Income		7,100,000,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost		10,000,000
Operating Loss Carryforwards Not Limited On Use		2,400,000,000
NOLs expected to expire unutilized			640,000,000
NOLs expected to expire unutilized due to carryforward time constraints		117,000,000
Reduction In State NOLs			44,000,000
Reduction Of State Taxable Income			24,000,000
Valuation allowance		2,222,000,000	2,336,000,000
Valuation Allowance, Deferred Tax Asset, Change in Amount		(114,000,000)	(50,000,000)	(186,000,000)
Tax refund due to foreign dividend income treatment		10,000,000
Tax refund plus accrued interest due to foreign dividend income treatment		13,000,000
Accrued interest on foreign dividend refund		3,000,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local		4,000,000,000
Deferred Tax Assets, Operating Loss Carryforwards, Foreign		1,000,000,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound		0
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound		28,000,000
Intraperiod tax expense from a prior period [Member]
Income Tax Expense (Benefit) [Abstract]
Deferred income tax liability, net of current				$ 13,000,000