Statement of Changes in Consolidated Equity (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Preferred stock, dividends per share	$ 1.875	$ 1.875	$ 3.75	$ 3.75
Common stock, dividends per share	$ 0.06	$ 0.06	$ 0.12	$ 0.12
Retained Earnings [Member]
Preferred stock, dividends per share	$ 1.875	$ 1.875	$ 3.75	$ 3.75
Common stock, dividends per share	$ 0.06	$ 0.06	$ 0.12	$ 0.12