Consolidated Statements of Changes in Equity (Parentheticals) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Dividends per Common Share	$ 0.915	$ 0.855	$ 0.78
Series F Preferred Stock [Member]
Dividends per Depositary share			$ 1.0344
Series G Preferred Stock [Member]
Dividends per Depositary share			$ 1.5016
Series H Preferred Stock [Member]
Dividends per Depositary share	$ 1.725	$ 1.725	$ 1.725
Series I Preferred Stock [Member]
Dividends per Depositary share	$ 1.5000	$ 1.5000	$ 1.1708
Series J Preferred Stock [Member]
Dividends per Depositary share	$ 1.3750	$ 1.3750	$ 0.5958
Series K Preferred Stock [Member]
Dividends per Depositary share	$ 1.40625	$ 1.40625	$ 0.0938