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 income (loss)
Balance at beginning of period at Dec. 31, 2013		$ 1,575	$ 0	$ 23,968	$ (18,774)	$ (108)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee benefit plans, including transfers and other				(5)
Net income (loss)	106				106
Dividends on preferred stock					(32)
Other comprehensive income	14					14
Total common shareholder's equity at end of period	5,169
Total shareholders' equity at end of period at Mar. 31, 2014	6,744	1,575		23,963	(18,700)	(94)
Balance at beginning of period at Dec. 31, 2014	7,123	1,575	0	23,987	(18,374)	(65)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee benefit plans, including transfers and other				(1)
Net income (loss)	(5)				(5)
Dividends on preferred stock					(32)
Other comprehensive income	11					11
Total common shareholder's equity at end of period	5,521
Total shareholders' equity at end of period at Mar. 31, 2015	$ 7,096	$ 1,575	$ 0	$ 23,986	$ (18,411)	$ (54)