Preferred Stock Textuals (Details) (USD $)				3 Months Ended	6 Months Ended		3 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Preferred Stock, No Voting Rights [Member]	Jun. 30, 2013 Preferred Stock, Voting Rights [Member]	Jun. 30, 2013 Preferred Stock, Voting Rights [Member]	Jun. 30, 2013 Employee Stock Ownership Plan Preferred Stock [Member]	Mar. 31, 2013 Series P - 5.25% Non-Cumulative Perpetual Class A Preferred Stock [Member]	Jun. 30, 2013 Series P - 5.25% Non-Cumulative Perpetual Class A Preferred Stock [Member]	Dec. 31, 2012 Series P - 5.25% Non-Cumulative Perpetual Class A Preferred Stock [Member]	Jun. 30, 2013 Series G - 7.25% Class A Preferred Stock [Member]	Jun. 30, 2013 Series H - Floating Class A Preferred Stock [Member]
Preferred Stock (Textual) [Abstract]
Preferred Stock, Shares Authorized			20,000,000	4,000,000	4,000,000
Par value	$ 15,387,000,000	$ 14,282,000,000	$ 0	$ 0	$ 0			$ 625,000,000	$ 0
Shares issued and outstanding	11,064,275	10,558,865		0	0			25,000	0
Voting Rights					If issued, preference shares would be limited to one vote per share
Depositary shares issued and outstanding							25,000,000
Percentage Interest in a share of issued preferred stock							0.10%
Preferred stock, commitment to issue										0	0
Redemption terms						We have the option to redeem the ESOP Preferred Stock at any time, in whole or in part, at a redemption price per share equal to the higher of (a) $1,000 per share plus accrued and unpaid dividends or (b) the fair market value
Additional paid-in capital included related to preferred stock	$ 119,000,000	$ 75,000,000