Earnings Per Common Share (Schedule Of Basic And Diluted Earnings Per Common Share) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Earnings Per Share [Abstract]
Net income (loss) from continuing operations	$ 60		$ 2
Preferred stock dividends - U.S. Department of Treasury	(133)		(134)
Preferred stock dividends	(67)		(67)
Net income (loss) from continuing operations attributable to common shareholders	(140)		(199)
Income (loss) from discontinued operations, net of tax	1,033		308
Net income (loss) attributable to common shareholders	$ 893		$ 109
Basic weighted-average common shares outstanding	1,330,970		1,330,970
Diluted weighted-average common shares outstanding	1,330,970	[1]	1,330,970	[1]
Earnings Per Share, Basic [Abstract]
Net income (loss) from continuing operations, Per Basic Share	$ (105)		$ (149)
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share	$ 776		$ 231
Net (loss) income, Basic	$ 671		$ 82
Earnings Per Share, Diluted [Abstract]
Net income (loss) from continuing operations, Per Diluted Share	$ (105)	[1]	$ (149)	[1]
Income (loss) from discontinued operations, net of tax, Diluted	$ 776	[1]	$ 231	[1]
Net (loss) income, Diluted	$ 671	[1]	$ 82	[1]
Potential common shares excluded from diluted earnings per share calculation	574,000		574,000

[1] Due to the antidilutive effect of converting the Fixed Rate Cumulative Mandatorily Convertible Preferred Stock into common shares and the net loss from continuing operations attributable to common shareholders for the three months ended March 31, 2013 and 2012, loss from continuing operations attributable to common shareholders and basic weighted-average common shares outstanding were used to calculate basic and diluted earnings per share.