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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)
12 Months Ended
Dec. 31, 2012
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Accumulated Other Comprehensive Income Loss Table Text Block
(Millions of Dollars)As of December 31,
NU2012 2011
Qualified Cash Flow Hedging Instruments (16.4)  (18.4)
Unrealized Gains on Other Securities  1.3   1.1
Pension, SERP and PBOP Benefits   (57.8)   (53.4)
Accumulated Other Comprehensive Loss$(72.9) $(70.7)
      
CL&P     
Qualified Cash Flow Hedging Instruments $(1.8) $(2.3)
      
PSNH     
Qualified Cash Flow Hedging Instruments $(9.7) $(10.9)
      
WMECO     
Qualified Cash Flow Hedging Instruments $(3.8) $(4.2)
Schedule Of Comprehensive Income Loss [Table Text Block]
The changes in the components of other comprehensive income/(loss) are reported net of the following income tax effects:
           
(Millions of Dollars)         
NU2012 2011 2010 
Qualified Cash Flow Hedging Instruments$ 1.3 $ (9.5) $ 0.2 
Change in Unrealized Gains on Other Securities  0.1   0.4   0.2 
Pension, SERP and PBOP Benefits  (2.7)   (7.9)   - 
Total$ (1.3) $ (17.0) $ 0.4 
          
CL&P         
Qualified Cash Flow Hedging Instruments$ 0.3 $ 0.3 $ 0.3 
          
PSNH         
Qualified Cash Flow Hedging Instruments$ 0.8 $ (7.0) $ 0.1 
          
WMECO         
Qualified Cash Flow Hedging Instruments$ 0.2 $ (2.7) $ - 
Schedule Of Cash Flow Hedges Included In Accumulated Other Comprehensive Income Loss [Table Text Block]
 Gains/(Losses) Recognized on Gains/(Losses) Reclassified from AOCI
 Derivative Instruments into Interest Expense
 For the Year Ended December 31, For the Years Ended December 31,
(Millions of Dollars)2011 2012 2011 2010
NU$ (25.1) $ (3.3) $ (1.3) $ (0.4)
CL&P  -   (0.7)   (0.7)   (0.7)
PSNH  (18.2)   (2.0)   (0.8)   (0.2)
WMECO  (6.9)   (0.5)   (0.1)   0.1

  For the Year Ended December 31, 2011  
(Millions of Dollars)NU  PSNH  WMECO  
Balance as of January 1, 2011$ (4.2) $ (0.6) $ (0.1)  
 Hedged Transactions Recognized into Earnings  0.7   0.5   0.1  
 Cash Flow Hedging Transactions Entered into for the Year  (14.9)   (10.8)   (4.2)  
Net Change Associated with Hedging Transactions  (14.2)   (10.3)   (4.1)  
Balance as of December 31, 2011$ (18.4) $ (10.9) $ (4.2)  
            
For further information regarding cash flow hedging transactions, see Note 5, "Derivative Instruments," to the consolidated financial statements.