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MERGER OF NU AND NSTAR (Tables)
12 Months Ended
Dec. 31, 2012
Notes To Consolidated Financial Statements [Abstract]  
Schedule of Business Acquisitions by Acquisition Equity Interest Issued or Issuable [Table Text Block]
NSTAR common shares outstanding as of April 9, 2012 (in thousands)*  103,696
Exchange ratio 1.312
NU common shares issued for NSTAR common shares outstanding (in thousands)  136,049
Closing price of NU common shares on April 9, 2012$36.79
Value of common shares issued (in millions)$ 5,005
Fair value of NU replacement stock-based compensation awards related to  
 pre-merger service (in millions) 33
Total purchase price (in millions)$ 5,038
Schedule of Purchase Price Allocation
(Billions of Dollars)  
Current Assets$ 0.7
Property Plant and Equipment, Net  5.1
Goodwill  3.2
Other Long-Term Assets, excluding Goodwill  2.1
Current Liabilities  (1.3)
Long-Term Liabilities  (2.7)
Long-Term Debt and Other Long-Term Obligations  (2.1)
Total Purchase Price$ 5.0
Business Acquisition, Pro Forma Information
 For the Years Ended December 31, 
(Pro forma amounts in millions, except per share amounts)2012 2011 
Operating Revenues$7,004 $7,361 
Net Income Attributable to Controlling Interest 630  689 
Basic EPS 2.00  2.20 
Diluted EPS 1.99  2.19 
Business Acquisition, Integration, Restructuring and Other Related Costs [Text Block]
  For the Years Ended December 31,
(Millions of Dollars)2012 2011
Transaction and Other Costs$ 32 $19
Settlement Agreement Impacts  60   -
Total After-Tax Non-Recurring Costs Excluded from      
 Pro Forma Net Income Attributable to Controlling Interest$ 92 $19

(Millions of Dollars)NU CL&P NSTAR Electric WMECO
Customer Rate Credits$ 46 $ 25 $15 $3
Storm Costs Deferral Reduction  40   40   -   -
Establishment of Energy Efficiency Fund  15   -   -   -
Total Pre-Tax Settlement Agreement Impacts$ 101 $ 65 $ 15 $ 3
Schedule Of Goodwill Text Block
   Electric Electric Natural Gas   
   Distribution Transmission Distribution Total
Balance as of December 31, 2011 $0.0 $0.0 $0.3 $0.3
 Merger with NSTAR  2.5  0.6  0.1  3.2
Balance as of December 31, 2012 $2.5 $0.6 $0.4 $3.5