Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parentheticals) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Dividends, per common share	$ 0.21	$ 0.19
Series F Preferred Stock [Member]
Dividends, per Depositary Share		$ 0.4156
Series G Preferred Stock [Member]
Dividends, per Depositary Share		$ 0.4844
Series H Preferred Stock [Member]
Dividends, per Depositary Share	$ 0.4313	$ 0.4313
Series I Preferred Stock [Member]
Dividends, per Depositary Share	$ 0.3750	$ 0.0458
Series J Preferred Stock [Member]
Dividends, per Depositary Share	$ 0.3438
Series K Preferred Stock [Member]
Dividends, per Depositary Share	$ 0.3516