Income Taxes - Textuals (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income Tax Contingency [Line Items]
Deferred Tax Assets, Net, Current	$ 21,000,000	$ 23,000,000
Net deferred tax liabilities	1,101,000,000	824,000,000
Unrecognized Tax Benefits, Period Increase (Decrease)	(26,000,000)	4,000,000
Operating Loss Carryforward [Abstract]
Operating and Capital Loss Carryforward Restriction Expiration Period	12 years
Federal income taxes
Operating Loss Carryforward [Abstract]
Net operating and capital loss carryforwards	7,700,000,000
Deferred tax assets subject to expiration	2,700,000,000
Operating and capital loss carryforwards unrestricted	3,700,000,000
Operating and capital loss carryforwards restricted	3,600,000,000
Federal income taxes | Restriction expirations between 2013 to 2014 [Member]
Operating Loss Carryforward [Abstract]
Operating and capital loss carryforwards restricted	900,000,000
Federal income taxes | Restriction expirations over the next 17 years [Member]
Operating Loss Carryforward [Abstract]
Operating and capital loss carryforwards restricted	226,000,000
State income taxes [Member]
Operating Loss Carryforward [Abstract]
Deferred tax assets subject to expiration	252,000,000
Charter Holdco Subsidiaries [Member]
Income Tax Contingency [Line Items]
Net deferred tax liabilities	$ 219,000,000	$ 221,000,000