Stockholders Equity (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Number of Common shares Issued [Member]	Jun. 30, 2010 Number of Common shares Issued [Member]	Jun. 30, 2011 Number of Common shares Treasury [Member]	Jun. 30, 2010 Number of Common shares Treasury [Member]	Jun. 30, 2011 Common Stockholders' Equity [Member]	Jun. 30, 2010 Common Stockholders' Equity [Member]	Jun. 30, 2011 Preferred and Preference Stock of Subsidiaries [Member]	Dec. 31, 2010 Preferred and Preference Stock of Subsidiaries [Member]	Jun. 30, 2010 Preferred and Preference Stock of Subsidiaries [Member]	Dec. 31, 2009 Preferred and Preference Stock of Subsidiaries [Member]
Changes in Stockholders' Equity
Beginning Balance			$ 16,909,000,000	$ 15,585,000,000					$ 16,202,000,000	$ 14,878,000,000	$ 707,000,000	$ 707,000,000	$ 707,000,000	$ 707,000,000
Beginning Balance, Shares					843,814,000	820,152,000	(474,000)	(505,000)
Net Income After Dividends on Preferred and Preference Stock	604,000,000	510,000,000	1,026,000,000	1,005,000,000					1,026,000,000	1,005,000,000
Other comprehensive income (loss)	4,000,000	5,000,000	8,000,000	14,000,000					8,000,000	14,000,000
Stock issued, shares					14,337,000	10,996,000
Stock issued			533,000,000	371,000,000					533,000,000	371,000,000
Cash dividends on common stock			(787,000,000)	(735,000,000)					(787,000,000)	(735,000,000)
Other, shares							(25,000)	63,000
Ending Balance	$ 17,689,000,000	$ 16,240,000,000	$ 17,689,000,000	$ 16,240,000,000					$ 16,982,000,000	$ 15,533,000,000	$ 707,000,000	$ 707,000,000	$ 707,000,000	$ 707,000,000
Ending Balance, Shares					858,151,000	831,148,000	(499,000)	(442,000)
Earnings per Share
As reported shares	855,000,000	828,000,000	851,000,000	825,000,000
Effect of options	7,000,000	5,000,000	7,000,000	4,000,000
Diluted shares	862,000,000	833,000,000	858,000,000	829,000,000
Stockholders' Equity (Textuals) [Abstract]
Anti dilutive stock options	800,000	20,000,000	600,000	20,000,000
Assumed average stock price			$ 39.04
Increase in effect of options		2,000,000		2,000,000