CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Millions	Total	Preferred Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at beginning of period at Dec. 31, 2010		$ 1,565	$ 13,785	$ 1,536	$ (153)
Total common shareholders' equity	16,837
Capital contributions from parent			21
Net income(loss)	873			873
Other comprehensive income, net of tax	812				812
Employee benefit plans and other			18
Cash dividends declared on preferred stock				(55)
Balance at end of period at Sep. 30, 2011	18,402		13,824	2,354	659
Balance at beginning of period at Dec. 31, 2011	18,502	1,565	13,814	2,481	642
Total common shareholders' equity	16,004
Net income(loss)	(1,092)			(1,092)
Other comprehensive income, net of tax	230				230
Employee benefit plans and other			(16)
Cash dividends declared on preferred stock				(55)
Balance at end of period at Sep. 30, 2012	$ 17,569		$ 13,798	$ 1,334	$ 872