Business Changes and Developments Other Changes and Developments (Details) (USD $)	3 Months Ended		6 Months Ended				0 Months Ended		3 Months Ended		0 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Preferred Stock Including Additional Paid in Capital	Jun. 30, 2012 Preferred Stock Including Additional Paid in Capital	Feb. 05, 2013 Non-Cumulative Preferred Stock, Series P Preferred Stock Including Additional Paid in Capital	Apr. 23, 2013 Fixed-to-Floating Rate Non-Cumulative Preferred Stock, Series Q [Member] Preferred Stock Including Additional Paid in Capital	Jun. 30, 2013 Common stock	Mar. 31, 2013 Common stock	May 08, 2013 Parent Company
Other Business Events Disclousre
Stock Issued During Period, Value, New Issues					$ 2,400,000,000	$ 0	$ 900,000,000	$ 1,500,000,000
Payments for Repurchase of Trust Preferred Securities											$ 5,000,000,000
Preferred Stock, Liquidation Preference, Percentage											100.00%
Common stock, dividends, per share	$ 0.38	$ 0.30	$ 0.68	$ 0.60					$ 0.38	$ 0.30