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COMMON SHARESHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (NU) (Tables)
12 Months Ended
Dec. 31, 2013
Notes To Consolidated Financial Statements [Abstract]  
Minority Interest Disclosure Text Block
19.COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS
               
A summary of the changes in Common Shareholders' Equity and Noncontrolling Interests of NU is as follows:
               
             Noncontrolling
    Common       Interest -
    Shareholders' Noncontrolling Total Preferred Stock
(Millions of Dollars)Equity Interest Equity of Subsidiaries
Balance as of January 1, 2011$ 3,811.2 $ 1.5 $ 3,812.7 $ 116.2
Net Income   400.5   -   400.5   -
Dividends on Common Shares  (195.6)   -   (195.6)   -
Dividends on Preferred Stock  (5.6)   -   (5.6)   (5.6)
Issuance of Common Shares  5.9   -   5.9   -
Contributions to NPT  -   1.2   1.2   -
Other Transactions, Net  23.9   -   23.9   -
Net Income Attributable to Noncontrolling Interests  (0.3)   0.3   -   5.6
Other Comprehensive Loss (Note 15)  (27.3)   -   (27.3)   -
Balance as of December 31, 2011$ 4,012.7 $ 3.0 $ 4,015.7 $ 116.2
Net Income   533.1   -   533.1   -
Purchase Price of NSTAR (1)  5,038.3   -   5,038.3   -
Other Equity Impacts of Merger with NSTAR (2)  3.4  (3.4)   -   39.4
Dividends on Common Shares  (375.5)   -   (375.5)   -
Dividends on Preferred Stock  (7.0)   -   (7.0)   (7.0)
Issuance of Common Shares  13.3   -   13.3   -
Contributions to NPT  -   0.3   0.3   -
Other Transactions, Net  21.1   -   21.1   -
Net Income Attributable to Noncontrolling Interests  (0.1)   0.1   -   7.0
Other Comprehensive Loss (Note 15)  (2.2)   -   (2.2)   -
Balance as of December 31, 2012$ 9,237.1 $ - $ 9,237.1 $ 155.6
Net Income   793.7   -   793.7   -
Dividends on Common Shares  (462.7)   -   (462.7)   -
Dividends on Preferred Stock  (7.7)   -   (7.7)   (7.7)
Issuance of Common Shares  11.1   -   11.1   -
Other Transactions, Net  13.2   -   13.2   -
Net Income Attributable to Noncontrolling Interests  -   -   -   7.7
Other Comprehensive Income (Note 15)  26.8   -   26.8   -
Balance as of December 31, 2013$ 9,611.5 $ - $ 9,611.5 $ 155.6