Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2009	Dec. 31, 2010	Dec. 31, 2008
Income Tax Disclosure [Abstract]
Non Cash Income Tax Benefit Loss From Continuing Operations		$ 321,000,000
Non Cash Income Tax Expense Recorded In Other Comprehensive Income		(321,000,000)
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	402,000,000		424,000,000
Operating Loss Carryforwards	16,800,000,000
Operating Loss Carryforwards, Expiration Dates	2022
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	5,000,000	47,000,000	72,000,000
Accumulated Other Comprehensive Income Valuation Allowance Net Of Tax	$ (2,454,000,000)	$ (1,207,000,000)	$ (1,213,000,000)	$ (1,515,000,000)