Business Changes and Developments Subsequent events (Details 1) (USD $) In Millions, unless otherwise specified	6 Months Ended		1 Months Ended	0 Months Ended
	Jun. 30, 2013 Preferred Stock Including Additional Paid in Capital	Jun. 30, 2012 Preferred Stock Including Additional Paid in Capital	Jul. 29, 2013 Fixed-to-Floating Rate Non-Cumulative Preferred Stock, Series R [Member] Preferred Stock Including Additional Paid in Capital Subsequent Event	Aug. 02, 2013 Non-Cumulative Preferred Stock, Series J [Member] Subsequent Event
Subsequent Event
Stock Issued During Period, Value, New Issues	$ 2,400	$ 0	$ 1,500
Preferred Stock, Dividend Rate, Percentage				8.625%