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QUARTERLY FINANCIAL DATA (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2013
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
NU Consolidated Statements of Quarterly Financial DataQuarter Ended
(Millions of Dollars, except per share information)March 31, June 30,  September 30, December 31,
2013           
Operating Revenues$ 1,995.0 $ 1,635.9 $ 1,892.6 $ 1,777.7
Operating Income  418.9   350.6   399.3   360.6
Net Income  230.0   173.1   211.4   179.2
Net Income Attributable to Controlling Interest  228.1   171.0   209.5   177.4
Basic and Diluted EPS (a)$ 0.72 $ 0.54 $ 0.66 $ 0.56
            
2012 (1)           
Operating Revenues$ 1,099.6 $ 1,628.7 $ 1,861.5 $ 1,684.0
Operating Income  214.4   159.5   412.9   331.4
Net Income  100.8   46.2   209.5   176.6
Net Income Attributable to Controlling Interest  99.3   44.3  207.6   174.7
Basic and Diluted EPS (a)$ 0.56 $ 0.15 $0.66 $ 0.55
            
(a) The summation of quarterly EPS data may not equal annual data due to rounding.
            
Statements of Quarterly Financial DataQuarter Ended
(Millions of Dollars)March 31, June 30,  September 30, December 31,
CL&P           
2013           
Operating Revenues$ 624.1 $ 569.3 $ 648.4 $ 600.5
Operating Income  149.7   136.8   133.9   119.2
Net Income  85.0   67.9   66.3   60.2
            
2012           
Operating Revenues$ 592.0 $ 562.1 $ 658.1 $ 595.2
Operating Income  111.9   40.4   139.7   135.0
Net Income  54.0   6.9   74.9   73.9
            
NSTAR Electric           
2013           
Operating Revenues$ 592.3 $ 570.4 $ 753.9 $ 576.9
Operating Income  94.5   112.5   192.0   109.2
Net Income  48.1   58.0   107.0   55.4
            
2012           
Operating Revenues$ 556.5 $ 534.6 $ 693.7 $ 516.2
Operating Income  22.5   93.9   194.1   70.9
Net Income  3.9   45.5   106.8   34.0
            
PSNH            
2013           
Operating Revenues$ 273.8 $ 216.1 $ 218.6 $ 226.9
Operating Income  58.1   54.3   56.6   56.2
Net Income  29.0   27.2   28.4   26.8
            
2012           
Operating Revenues$ 243.0 $ 255.1 $ 256.9 $ 233.0
Operating Income  45.4   47.0   61.3   51.4
Net Income  21.3   21.2   27.2   27.2
            
WMECO           
2013           
Operating Revenues$ 125.0 $ 115.0 $ 121.8 $ 110.9
Operating Income  35.6   32.4   28.9   22.4
Net Income  18.6   16.4   15.0   10.4
            
2012           
Operating Revenues$ 114.0 $ 106.8 $ 112.5 $107.9
Operating Income  28.7   25.1   28.1   28.9
Net Income  14.2   11.1   14.1   15.1