Consolidated Statements of Changes in Equity (Parentheticals) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Dividends per Common Share (in Dollars per share)	$ 0.78	$ 0.73	$ 0.66
Series F Preferred Stock [Member]
Dividends per Depositary share (in Dollars per share)	$ 1.0344	$ 1.6625	$ 1.6625
Series G Preferred Stock [Member]
Dividends per Depositary share (in Dollars per share)	$ 1.5016	$ 1.9375	$ 1.9375
Series H Preferred Stock [Member]
Dividends per Depositary share (in Dollars per share)	$ 1.725	$ 1.7250	$ 0.5798
Series I Preferred Stock [Member]
Dividends per Depositary share (in Dollars per share)	$ 1.1708
Series J Preferred Stock [Member]
Dividends per Depositary share (in Dollars per share)	$ 0.5958
Series K Preferred Stock [Member]
Dividends per Depositary share (in Dollars per share)	$ 0.0938