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COMMON SHARESHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (NU)
6 Months Ended
Jun. 30, 2014
Notes To Consolidated Financial Statements [Abstract]  
Stockholders' Equity Note Disclosure [Text Block]
12.COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS 
                
A summary of the changes in Common Shareholders' Equity and Noncontrolling Interests of NU is as follows:
                
    For the Three Months Ended 
    June 30, 2014 June 30, 2013 
       Noncontrolling    Noncontrolling 
      Interest -     Interest -  
    Common Preferred Common Preferred 
    Shareholders' Stock of Shareholders' Stock of 
(Millions of Dollars)Equity Subsidiaries Equity Subsidiaries 
Balance as of Beginning of Period$ 9,723.9 $ 155.6 $ 9,345.2 $ 155.6 
Net Income   129.2   -   173.1   - 
Dividends on Common Shares  (124.1)   -   (115.6)   - 
Dividends on Preferred Stock  (1.9)   (1.9)   (2.0)   (2.0) 
Issuance of Common Shares  0.2   -   0.3   - 
Other Transactions, Net  23.7   -   4.2   - 
Net Income Attributable to Noncontrolling Interests  -   1.9   -   2.0 
Other Comprehensive Income  2.8   -   1.4   - 
Balance as of End of Period$ 9,753.8 $ 155.6 $ 9,406.6 $ 155.6 
                
    For the Six Months Ended 
    June 30, 2014 June 30, 2013 
       Noncontrolling    Noncontrolling 
      Interest -     Interest -  
    Common Preferred Common Preferred 
    Shareholders' Stock of Shareholders' Stock of 
(Millions of Dollars)Equity Subsidiaries Equity Subsidiaries 
Balance as of Beginning of Period$ 9,611.5 $ 155.6 $ 9,237.1 $ 155.6 
Net Income   367.1   -   403.0   - 
Dividends on Common Shares  (247.9)   -   (232.1)   - 
Dividends on Preferred Stock  (3.8)   (3.8)   (3.9)   (3.9) 
Issuance of Common Shares  5.4   -   8.8   - 
Other Transactions, Net  17.0   -   (9.7)   - 
Net Income Attributable to Noncontrolling Interests  -   3.8   -   3.9 
Other Comprehensive Income  4.5   -   3.4   - 
Balance as of End of Period$ 9,753.8 $ 155.6 $ 9,406.6 $ 155.6