Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parentheticals) (Parent [Member], USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Dividends, per common share	$ 0.38	$ 0.36
Series F Preferred Stock [Member]
Dividends, per Depositary share	$ 0.8312	$ 0.8312
Series G Preferred Stock [Member]
Dividends, per Depositary share	$ 0.9688	$ 0.9688
Series H Preferred Stock [Member]
Dividends, per Depositary share	$ 0.8625	$ 0.8625
Series I Preferred Stock [Member]
Dividends, per Depositary share	$ 0.4208