Consolidated Statement of Changes in Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2012 $25 Par Preferred Stock [Member]	Dec. 31, 2011 $25 Par Preferred Stock [Member]	Dec. 31, 2010 $25 Par Preferred Stock [Member]	Dec. 31, 2011 Series D [Member]	Dec. 31, 2010 Series D [Member]
Preferred stock, dividends per share	$ 1.00	$ 1.00	$ 1.00	$ 12.81	$ 51.24
Preferred Stock, Par Value	$ 25	$ 25	$ 25		$ 1