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, 2012	$ 19,898	$ 19,668	$ 5,685	$ 1,255	$ (7,021)	$ 311
Net income (loss)	1,093
Preferred stock dividends - U.S. Department of Treasury	(133)				(133)
Preferred stock dividends	(67)				(67)
Other comprehensive income (loss)	(317)					(317)
Ending Balance at Mar. 31, 2013	20,474	19,668	5,685	1,255	(6,128)	(6)
Beginning Balance at Dec. 31, 2013	14,208	20,939	0	1,255	(7,710)	(276)
Net income (loss)	227
Preferred stock dividends - U.S. Department of Treasury	0
Preferred stock dividends	(68)				(68)
Other comprehensive income (loss)	92					92
Ending Balance at Mar. 31, 2014	$ 14,459	$ 20,939	$ 0	$ 1,255	$ (7,551)	$ (184)