CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Millions, except Share data, 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	$ 0	$ 23,966	$ (18,219)	$ (396)
Number of shares, beginning of period at Dec. 31, 2011		576,000	68
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee benefit plans, including transfers and other				8
Net income (loss)	(845)				(845)
Dividends on preferred stock					(123)
Other comprehensive income	139					139
Total common shareholder's equity at end of period	4,530
Total shareholders' equity at end of period at Dec. 31, 2012	6,105	1,575	0	23,974	(19,187)	(257)
Number of shares, end of period at Dec. 31, 2012		576,000	68
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee benefit plans, including transfers and other				(6)
Net income (loss)	536				536
Dividends on preferred stock					(123)
Other comprehensive income	149					149
Total common shareholder's equity at end of period	5,086
Total shareholders' equity at end of period at Dec. 31, 2013	6,661	1,575	0	23,968	(18,774)	(108)
Number of shares, end of period at Dec. 31, 2013		576,000	68
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee benefit plans, including transfers and other				19
Net income (loss)	523				523
Dividends on preferred stock					(123)
Other comprehensive income	43					43
Total common shareholder's equity at end of period	5,548
Total shareholders' equity at end of period at Dec. 31, 2014	$ 7,123	$ 1,575	$ 0	$ 23,987	$ (18,374)	$ (65)
Number of shares, end of period at Dec. 31, 2014		576,000	68