CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Preferred stock	Common stock	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive income (loss)
Shares, Outstanding		576,000	68
Balance at beginning of period at Dec. 31, 2012		$ 1,575	$ 0	$ 23,614	$ (18,827)	$ (257)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on preferred stock				(123)
Employee benefit plans, including transfers and other				(6)
Net income (loss)	$ 536				536
Other comprehensive income	149					149
Total shareholders' equity at end of period at Dec. 31, 2013	6,661	$ 1,575	$ 0	23,485	(18,291)	(108)
Shares, Outstanding		576,000	68
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total common shareholder's equity at end of period	5,086
Dividends on preferred stock				(123)
Employee benefit plans, including transfers and other				19
Net income (loss)	523				523
Other comprehensive income	43					43
Total shareholders' equity at end of period at Dec. 31, 2014	7,123	$ 1,575	$ 0	23,381	(17,768)	(65)
Shares, Outstanding		576,000	68
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total common shareholder's equity at end of period	5,548
Dividends on preferred stock				(123)
Employee benefit plans, including transfers and other				(13)
Net income (loss)	(431)				(431)
Other comprehensive income	79					79
Total shareholders' equity at end of period at Dec. 31, 2015	6,635	$ 1,575	$ 0	$ 23,245	$ (18,199)	$ 14
Shares, Outstanding		576,000	68
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total common shareholder's equity at end of period	$ 5,060