Consolidated Statement of Changes in Shareholders' Equity (Unaudited) (USD $) In Millions	Total	Preferred stock	Common Stock	Additional Paid-in capital	Retained Earnings	Accumulated other comprehensive income (loss)
Beginning balance at Dec. 31, 2010		$ 1,565		$ 13,785	$ 1,536	$ (153)
Capital contributions from parent				21
Employee benefit plans and other				2
Net income	479				479
Cash dividends declared on preferred stock					(18)
Other comprehensive income, net of tax	4					4
Ending balance at Mar. 31, 2011	17,221	1,565		13,808	1,997	(149)
Beginning balance at Dec. 31, 2011	18,502	1,565		13,814	2,481	642
Employee benefit plans and other				(1)
Net income	235				235
Cash dividends declared on preferred stock					(19)
Other comprehensive income, net of tax	(89)					(89)
Ending balance at Mar. 31, 2012	$ 18,628	$ 1,565		$ 13,813	$ 2,697	$ 553