CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (USD $) In Millions, unless otherwise specified	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated deficit	Accumulated other comprehensive loss
Balance at beginning of period at Dec. 31, 2011		$ 1,575		$ 23,966	$ (18,219)	$ (396)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee benefit plans, including transfers and other				1
Net income (loss)	(413)				(413)
Dividends on preferred stock					(61)
Other comprehensive income	58					58
Total common shareholder's equity at end of period	4,936
Total shareholders' equity at end of period at Jun. 30, 2012	6,511		0	23,967	(18,693)	(338)
Balance at beginning of period at Dec. 31, 2012	6,105	1,575		23,974	(19,187)	(257)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee benefit plans, including transfers and other				(10)
Net income (loss)	446				446
Dividends on preferred stock					(62)
Other comprehensive income	80					80
Total common shareholder's equity at end of period	4,984
Total shareholders' equity at end of period at Jun. 30, 2013	$ 6,559		$ 0	$ 23,964	$ (18,803)	$ (177)