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COMMON SHARESHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (NU) (Tables)
3 Months Ended
Mar. 31, 2014
Notes To Consolidated Financial Statements [Abstract]  
Minority Interest 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 
    March 31, 2014 March 31, 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   237.8   -   230.0   - 
Dividends on Common Shares  (123.9)   -   (116.4)   - 
Dividends on Preferred Stock  (1.9)   (1.9)   (1.9)   (1.9) 
Issuance of Common Shares  5.2   -   8.4   - 
Other Transactions, Net  (6.5)   -   (14.0)   - 
Net Income Attributable to Noncontrolling Interests  -   1.9   -   1.9 
Other Comprehensive Income  1.7   -   2.0   - 
Balance as of End of Period$ 9,723.9 $ 155.6 $ 9,345.2 $ 155.6