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COMMON SHARESHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (NU)
3 Months Ended
Mar. 31, 2012
Notes To Consolidated Financial Statements [Abstract]  
Stockholders' Equity Note Disclosure [Text Block]
##COM. 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, 2012 March 31, 2011
             Preferred Stock           Preferred Stock
    Common       Not Subject to Common       Not Subject to
    Shareholders' Noncontrolling Total Mandatory Shareholders' Noncontrolling Total Mandatory
(Millions of Dollars)Equity Interest Equity Redemption Equity Interest Equity Redemption
Balance as of Beginning of Period$ 4,012.7 $ 3.0 $ 4,015.7 $ 116.2 $3,811.2 $ 1.5 $ 3,812.7 $ 116.2
Net Income   100.8   -   100.8   -  115.6   -   115.6   -
Dividends on Common Shares  (52.6)   -  (52.6)   -  (48.8)   -   (48.8)   -
Dividends on Preferred Stock  (1.4)   -   (1.4)   (1.4)  (1.4)   -   (1.4)   (1.4)
Issuance of Common Shares  6.2   -   6.2   -  4.2   -   4.2   -
Contributions to NPT  -   0.3   0.3   -   -   -   -   -
Other Transactions, Net  0.8   -   0.8   -  2.4   -   2.4   -
Net Income Attributable to                        
 Noncontrolling Interests  (0.1)   0.1   -   1.4   -   -   -   1.4
Other Comprehensive Income  1.9   -   1.9   -  2.1   -   2.1   -
Balance as of End of Period$4,068.3 $3.4 $4,071.7 $116.2 $3,885.3 $ 1.5 $ 3,886.8 $ 116.2
                           
For the three months ended March 31, 2012 and 2011, there was no change in NU parent's 100 percent ownership of the common equity of CL&P and 75 percent ownership of NPT.