Consolidated Statement Of Changes In Equity (USD $) In Millions	Total	Common stock and paid-in capital [Member]	Mandatorily convertible preferred stock held by U.S. Department Of Treasury [Member]	Preferred stock [Member]	Retained earnings (accumulated deficit) [Member]	Accumulated Other Comprehensive Income [Member]
Beginning Balance at Dec. 31, 2011	$ 19,280	$ 19,668	$ 5,685	$ 1,255	$ (7,415)	$ 87
Net income (loss)	(588)				(588)
Preferred stock dividends - U.S. Department of Treasury	(267)				(267)
Preferred stock dividends	(134)				(134)
Other comprehensive income (loss)	(19)					(19)
Ending Balance at Jun. 30, 2012	18,272	19,668	5,685	1,255	(8,404)	68
Beginning Balance at Dec. 31, 2012	19,898	19,668	5,685	1,255	(7,021)	311
Net income (loss)	166				166
Preferred stock dividends - U.S. Department of Treasury	(267)				(267)
Preferred stock dividends	(134)				(134)
Other comprehensive income (loss)	(498)					(498)
Ending Balance at Jun. 30, 2013	$ 19,165	$ 19,668	$ 5,685	$ 1,255	$ (7,256)	$ (187)