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Noncontrolling Interests (Preferred Stockholders' Equity in Subsidiaries) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Noncontrolling Interest [Line Items]    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 25.00%  
Noncontrolling Interest, Ownership Percentage by Parent 75.00%  
Preferred Stock, Dividend Rate, Percentage 4.00% 4.00%
Preferred Stock, Cumulative Dividend Increase Interval if Outstanding Once Callable 6 months  
Redeemable Preferred Stock Member
   
Noncontrolling Interest [Line Items]    
Shares, Outstanding 300,000  
Preferred Stock, Value, Issued $ 300  
Preferred Stock, Dividend Rate, Percentage 6.125%  
Preferred stock-perpetual voting, dividend increase percentage each interval once shares become callable 50.00%