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MARKETABLE SECURITIES (Tables)
3 Months Ended
Mar. 31, 2014
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Available For Sale Securities Reconciliation [Table TextBlock]
  As of March 31, 2014
     Pre-Tax Pre-Tax    
  Amortized Unrealized Unrealized   
(Millions of Dollars)Cost Gains(1) Losses(1) Fair Value
NU           
 Debt Securities (2)$ 300.6 $ 4.8 $ (0.7) $ 304.7
 Equity Securities (2)  163.3   65.6   -   228.9
             
WMECO            
 Debt Securities  58.0   -   (0.1)   57.9
             
  As of December 31, 2013
     Pre-Tax Pre-Tax    
  Amortized Unrealized Unrealized   
(Millions of Dollars)Cost Gains(1) Losses(1) Fair Value
NU           
 Debt Securities (2)$ 299.2 $ 2.5 $ (2.1) $ 299.6
 Equity Securities (2)  163.6   60.5   -   224.1
             
WMECO            
 Debt Securities  57.9   -   -   57.9
Investments Classified by Contractual Maturity Date [Table Text Block]
  NU WMECO
  Amortized   Amortized  
(Millions of Dollars)Cost Fair Value Cost Fair Value
Less than one year (1)$ 54.5 $ 54.4 $ 19.2 $ 19.2
One to five years  73.3   73.9   33.2   33.2
Six to ten years  68.1   69.4   1.6   1.6
Greater than ten years  104.7   107.0   4.0   3.9
Total Debt Securities$ 300.6 $ 304.7 $ 58.0 $ 57.9
Fair Value Heirarchy [Table Text Block]
    NU WMECO
    As of As of
(Millions of Dollars)March 31, 2014 December 31, 2013 March 31, 2014 December 31, 2013
Level 1:            
 Mutual Funds and Equities$ 310.3 $ 281.3 $ - $ -
 Money Market Funds  22.5   32.9   4.3   10.9
Total Level 1$ 332.8 $ 314.2 $ 4.3 $ 10.9
Level 2:           
 U.S. Government Issued Debt Securities            
  (Agency and Treasury)$ 56.7 $ 61.4 $ - $ 6.8
 Corporate Debt Securities  56.3   53.6   14.1   15.1
 Asset-Backed Debt Securities  35.3   30.4   14.0   9.0
 Municipal Bonds  109.6   105.5   12.3   11.2
 Other Fixed Income Securities  24.3   15.8   13.2   4.9
Total Level 2$ 282.2 $ 266.7 $ 53.6 $ 47.0
Total Marketable Securities$ 615.0 $ 580.9 $ 57.9 $ 57.9