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DERIVATIVE INSTRUMENTS (Tables)
6 Months Ended
Jun. 30, 2014
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value Text Block
  As of June 30, 2014
  Commodity Supply and    Net Amount Recorded as
(Millions of Dollars)Price Risk Management Netting (1) Derivative Asset/(Liability)
Current Derivative Assets:        
Level 2:        
 NU (1)$ 0.4 $ (0.1) $ 0.3
Level 3:        
 NU, CL&P (1)  16.4   (4.8)   11.6
          
Long-Term Derivative Assets:        
Level 3:         
 NU, CL&P (1)$ 111.7 $ (17.0) $ 94.7
          
Current Derivative Liabilities:        
Level 2:        
 NU (1)$ (0.7) $ 0.2 $ (0.5)
Level 3:        
 NU  (87.8)   -   (87.8)
 CL&P  (85.6)   -   (85.6)
 NSTAR Electric  (2.2)   -   (2.2)
          
Long-Term Derivative Liabilities:        
Level 3:        
 NU$ (449.4) $ - $ (449.4)
 CL&P   (445.3)   -   (445.3)
 NSTAR Electric  (4.1)   -   (4.1)

  As of December 31, 2013
  Commodity Supply and    Net Amount Recorded as
(Millions of Dollars)Price Risk Management Netting (1) Derivative Asset/(Liability)
Current Derivative Assets:        
Level 2:        
 NU (1)$ 1.9 $ (0.3) $ 1.6
Level 3:        
 NU (1)  18.4   (9.8)   8.6
 CL&P (1)  17.1   (9.8)   7.3
 NSTAR Electric  1.2   -   1.2
          
Long-Term Derivative Assets:        
Level 2:        
 NU$ 0.2 $ - $ 0.2
Level 3:         
 NU (1)  116.2   (42.2)   74.0
 CL&P (1)  113.6   (42.2)   71.4
          
Current Derivative Liabilities:        
Level 3:        
 NU$ (93.7) $ - $ (93.7)
 CL&P  (92.2)   -   (92.2)
 NSTAR Electric  (1.5)   -   (1.5)
          
Long-Term Derivative Liabilities:        
Level 3:        
 NU$ (624.1) $ - $ (624.1)
 CL&P   (617.1)   -   (617.1)
 NSTAR Electric  (7.0)   -   (7.0)
Schedule Of Derivative Instruments Gain Loss In Statement Of Financial Performance Text Block
  Amounts Recognized on Derivatives
  For the Three Months Ended June 30,  For the Six Months Ended June 30,
(Millions of Dollars) 2014 2013 2014 2013
NU              
Balance Sheets:              
 Regulatory Assets and Liabilities $ 111.6 $ 22.2  $ 166.0 $ 50.1 
Statements of Income:              
 Purchased Power, Fuel and Transmission   -   0.5    -   0.8 
Rollforward Of Net Derivative Asset Liabilities Valued Using Unobservable Inputs [Table Text Block]
  For the Three Months Ended June 30, For the Six Months Ended June 30,
  2014 2013 2014 2013
(Millions of Dollars)NU NU NU NU
Derivatives, Net:            
Fair Value as of Beginning of Period$ (564.3) $ (833.1) $ (635.2) $ (878.6)
Net Realized/Unrealized Gains Included in:            
  Net Income  -   1.3   -   7.1
  Regulatory Assets and Liabilities  111.8   22.7   161.3   48.9
Settlements  21.6   21.0   43.0   34.5
Fair Value as of End of Period$ (430.9) $ (788.1) $ (430.9) $ (788.1)

  For the Three Months Ended June 30,
  2014  2013
(Millions of Dollars)CL&P NSTAR Electric  CL&P NSTAR Electric
Derivatives, Net:             
Fair Value as of Beginning of Period$ (557.0) $ (7.3)  $ (819.6) $ (13.6)
Net Realized/Unrealized Gains/(Losses) Included in Regulatory Assets and Liabilities  112.2   (0.4)    21.9   (0.5)
Settlements  20.2   1.4    21.9   1.0
Fair Value as of End of Period$ (424.6) $ (6.3)  $ (775.8) $ (13.1)
              
  For the Six Months Ended June 30,
  2014  2013
(Millions of Dollars)CL&P NSTAR Electric  CL&P NSTAR Electric
Derivatives, Net:             
Fair Value as of Beginning of Period$ (630.6) $ (7.3)  $ (866.2) $ (14.9)
Net Realized/Unrealized Gains/(Losses) Included in Regulatory Assets and Liabilities  164.5   (0.5)    46.3   0.2
Settlements  41.5   1.5    44.1   1.6
Fair Value as of End of Period$ (424.6) $ (6.3)  $ (775.8) $ (13.1)
Fairvalueinputsliabilitiesquantitativeinformationtabletextblock
 As of June 30, 2014 As of December 31, 2013
  Range Period Covered  Range Period Covered
Energy Prices:                 
NU$63-66per MWh 2018 - 2020 $49-77per MWh 2018 - 2029
CL&P$63-66per MWh 2018 - 2020 $56-58per MWh 2018 - 2029
                  
Capacity Prices:                 
NU$3.13-13.00 per kW-Month 2016 - 2026 $5.07-11.82 per kW-Month 2017 - 2029
CL&P$7.00-13.00 per kW-Month 2018 - 2026 $5.07-10.42 per kW-Month 2017 - 2026
NSTAR Electric$3.13-11.13 per kW-Month 2016 - 2019 $5.07-7.38 per kW-Month 2017 - 2019
                  
Forward Reserve:                 
NU, CL&P$3.30-9.50 per kW-Month 2014 - 2024 $3.30-3.30 per kW-Month 2014 - 2024
                  
REC Prices:                 
NU$38-70 per REC 2014 - 2018 $36-87 per REC 2014 - 2029
NSTAR Electric$38-70 per REC 2014 - 2018 $36-70 per REC 2014 - 2018