Consolidated Statements of Changes in Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends per Common Share	$ 0.975	$ 0.915	$ 0.855
Series H Preferred Stock [Member]
Dividends per Depositary share	1.485	1.725	1.725
Series I Preferred Stock [Member]
Dividends per Depositary share	1.5000	1.5000	1.5000
Series J Preferred Stock [Member]
Dividends per Depositary share	1.3750	1.3750	1.3750
Series K Preferred Stock [Member]
Dividends per Depositary share	$ 1.40625	$ 1.40625	$ 1.40625