CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (USD $) In Millions, unless otherwise specified	Total	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Preferred Stock [Member]
Balance at beginning and end of period at Dec. 31, 2010					$ 1,575
Balance at beginning of period at Dec. 31, 2010		23,321	(16,685)	(491)
Dividends:
Preferred stock			(96)
Capital contribution from parent	(400)	400
Net loss	(1,130)		(1,130)
Other comprehensive income	39			39
Employee benefit plans, including transfers and other		6
Total shareholders' equity at end of period at Sep. 30, 2011	6,939
Balance at end of period at Sep. 30, 2011	5,364	23,727	(17,911)	(452)
Balance at beginning and end of period at Dec. 31, 2011	6,926				1,575
Balance at beginning of period at Dec. 31, 2011	5,351	23,966	(18,219)	(396)
Dividends:
Preferred stock			(92)
Net loss	(550)		(550)
Other comprehensive income	111			111
Employee benefit plans, including transfers and other		8
Total shareholders' equity at end of period at Sep. 30, 2012	6,403
Balance at end of period at Sep. 30, 2012	$ 4,828	$ 23,974	$ (18,861)	$ (285)