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Statement of Changes in Consolidated Equity (Parenthetical) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Preferred, dividends per share   $ 0.9375us-gaap_PreferredStockDividendsPerShareDeclared
Common stock, dividends per share $ 0.03us-gaap_CommonStockDividendsPerShareDeclared $ 0.03us-gaap_CommonStockDividendsPerShareDeclared
Preferred Class A [Member]    
Preferred, dividends per share $ 0.9375us-gaap_PreferredStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember
 
Preferred Class B [Member]    
Preferred, dividends per share $ 6.71875us-gaap_PreferredStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassBMember