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Statement of Changes in Consolidated Equity (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Preferred, dividends per share   $ 0.9375   $ 1.875
Common stock, dividends per share $ 0.03 $ 0.03 $ 0.06 $ 0.06
Preferred Class A [Member]        
Preferred, dividends per share 0.9375   1.875  
Preferred Class B [Member]        
Preferred, dividends per share $ 6.71875   $ 13.4375