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COMMON SHARESHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (NU) (Tables)
3 Months Ended
Mar. 31, 2013
Notes To Consolidated Financial Statements [Abstract]  
Minority Interest Disclosure Text Block
13.COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (NU)
                      
A summary of the changes in Common Shareholders' Equity and Noncontrolling Interests of NU is as follows: 
                      
    For the Three Months Ended 
    March 31, 2013 March 31, 2012 
       Noncontrolling          Noncontrolling 
      Interest -           Interest -  
    Common Preferred Common Non-   Preferred 
    Shareholders' Stock of Shareholders' Controlling Total Stock of 
(Millions of Dollars)Equity Subsidiaries Equity Interest Equity Subsidiaries 
Balance - Beginning of Period$ 9,237.1 $ 155.6 $ 4,012.7 $ 3.0 $ 4,015.7 $ 116.2 
Net Income   230.0   -   100.8   -   100.8   - 
Dividends on Common Shares  (116.4)   -   (52.6)   -   (52.6)   - 
Dividends on Preferred Stock  (1.9)   (1.9)   (1.4)   -   (1.4)   (1.4) 
Issuance of Common Shares  8.4   -   6.2   -   6.2   - 
Contributions to NPT  -   -   -   0.3   0.3   - 
Other Transactions, Net  (14.0)   -   0.8   -   0.8   - 
Net Income Attributable to                   
 Noncontrolling Interests  -   1.9   (0.1)   0.1   -   1.4 
Other Comprehensive Income  2.0   -   1.9   -   1.9   - 
Balance - End of Period$ 9,345.2 $ 155.6 $ 4,068.3 $ 3.4 $ 4,071.7 $ 116.2