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DERIVATIVE INSTRUMENTS (Tables)
3 Months Ended
Mar. 31, 2013
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value Text Block
  As of March 31, 2013
  Commodity Supply and   Net Amount Recorded as
(Millions of Dollars)Price Risk Management Netting (1) Derivative Asset/(Liability) (2)
Current Derivative Assets:        
Level 2:        
 Other (1)$1.6 $ - $ 1.6
Level 3:        
 CL&P (1)  17.5   (10.5)   7.0
 Other  1.9   -   1.9
Total Current Derivative Assets$ 21.0 $ (10.5) $ 10.5
          
Long-Term Derivative Assets:        
Level 3:         
 CL&P (1)$ 152.3 $ (57.3) $ 95.0
Total Long-Term Derivative Assets$ 152.3 $ (57.3) $ 95.0
          
Current Derivative Liabilities:        
Level 2:        
 Other (1) (3)$ (12.0) $ - $ (12.0)
Level 3:        
 CL&P  (95.6)   -   (95.6)
 NSTAR Electric  (1.3)   -   (1.3)
 WMECO  (0.1)   -   (0.1)
Total Current Derivative Liabilities$ (109.0) $ - $ (109.0)
          
Long-Term Derivative Liabilities:        
Level 3:        
 CL&P $ (826.0) $ - $ (826.0)
 NSTAR Electric  (12.3)   -   (12.3)
 WMECO  (1.7)   -   (1.7)
Total Long-Term Derivative Liabilities (4)$ (840.0) $ - $ (840.0)

  As of December 31, 2012
  Commodity Supply and   Net Amount Recorded as
(Millions of Dollars)Price Risk Management Netting (1) Derivative Asset/(Liability) (2)
Current Derivative Assets:        
Level 2:        
 Other (1)$ 0.2 $ - $ 0.2
Level 3:        
 CL&P (1)  17.7   (12.0)   5.7
 Other  5.5   -   5.5
Total Current Derivative Assets$ 23.4 $ (12.0) $ 11.4
          
Long-Term Derivative Assets:        
Level 3:         
 CL&P (1)$ 159.7 $ (69.1) $ 90.6
Total Long-Term Derivative Assets$ 159.7 $ (69.1) $ 90.6
          
Current Derivative Liabilities:        
Level 2:        
 Other (1), (3)$ (19.9) $ 0.6 $ (19.3)
Level 3:        
 CL&P  (96.9)   -   (96.9)
 NSTAR Electric  (1.0)   -   (1.0)
Total Current Derivative Liabilities$ (117.8) $ 0.6 $ (117.2)
          
Long-Term Derivative Liabilities:        
Level 2:        
 Other (1)$ (0.2) $ - $ (0.2)
Level 3:        
 CL&P   (865.6)   -   (865.6)
 NSTAR Electric  (13.9)   -   (13.9)
 WMECO  (3.0)   -   (3.0)
Total Long-Term Derivative Liabilities$ (882.7) $ - $ (882.7)
Schedule Of Derivative Instruments Gain Loss In Statement Of Financial Performance Text Block
          
Location of Amounts  Amounts Recognized on Derivatives
Recognized on Derivatives  For the Three Months Ended March 31,
(Millions of Dollars)  2013 2012 
NU        
Balance Sheet:        
 Regulatory Assets  $ 28.0 $ 6.0 
Statement of Income:        
 Purchased Power, Fuel and Transmission    0.3   (0.8) 
Schedule Of Credit Risk Contingent Features [Table Text Block]
 As of March 31, 2013 As of December 31, 2012
       Additional Collateral       Additional Collateral
 Fair Value Subject     Required if Fair Value Subject     Required if
 to Credit Risk Cash  Downgraded Below to Credit Risk Cash  Downgraded Below
(Millions of Dollars)Contingent Features Collateral Posted Investment Grade Contingent Features Collateral Posted Investment Grade
NU$ (8.4) $ - $ 9.4 $ (15.3) $ - $ 17.4
Rollforward Of Net Derivative Asset Liabilities Valued Using Unobservable Inputs [Table Text Block]
  For the Three Months Ended 
  March 31, 2013 March 31, 2012 
(Millions of Dollars)NU NU 
Derivatives, Net:       
Fair Value as of Beginning of Period$ (878.6) $ (962.2) 
Transfer to Level 2  -   32.2 
Net Realized/Unrealized Gains Included in:       
  Net Income (2)  5.7   8.0 
  Regulatory Assets  26.2   6.0 
Settlements  13.6   14.5 
Fair Value as of End of Period$ (833.1) $ (901.5) 

  For the Three Months Ended
  March 31, 2013 March 31, 2012
(Millions of Dollars)CL&P NSTAR Electric WMECO CL&P NSTAR Electric(1) WMECO
Derivatives, Net:                  
Fair Value as of Beginning of Period$ (866.2) $ (14.9) $ (3.0) $ (931.6) $ (3.4) $ (7.3)
Net Realized/Unrealized Gains/(Losses)                 
 Included in Regulatory Assets  24.3   0.7   1.2   10.9   (3.4)   (5.0)
Settlements  22.3   0.6   -   21.1   1.4   -
Fair Value as of End of Period$ (819.6) $ (13.6) $ (1.8) $ (899.6) $ (5.4) $ (12.3)
Fairvalueinputsliabilitiesquantitativeinformationtabletextblock
 Range Period Covered Range Period Covered
Energy Prices:       
NU$44 - $90 per MWh 2018 - 2028 $43 - $90 per MWh 2018 - 2028
CL&P$50 - $54 per MWh 2018 - 2020 $50 - $55 per MWh 2018 - 2020
WMECO$44 - $90 per MWh 2018 - 2028 $43 - $90 per MWh 2018 - 2028
        
Capacity Prices:       
NU$1.40 - $10.53 per kW-Month 2016 - 2028 $1.40 - $10.53 per kW-Month 2016 - 2028
CL&P$1.40 - $9.83 per kW-Month 2016 - 2026 $1.40 - $9.83 per kW-Month 2016 - 2026
NSTAR Electric$1.40 - $3.39 per kW-Month 2016 - 2019 $1.40 - $3.39 per kW-Month 2016 - 2019
WMECO$1.40 - $10.53 per kW-Month 2016 - 2028 $1.40 - $10.53 per kW-Month 2016 - 2028
        
Forward Reserve:       
NU, CL&P$3.00 per kW-Month 2013 - 2024 $0.35 - $0.90 per kW-Month 2013 - 2024
        
REC Prices:       
NU$25 - $85 per REC 2013 - 2028 $25 - $85 per REC 2013 - 2028
NSTAR Electric$25 - $71 per REC 2013 - 2018 $25 - $71 per REC 2013 - 2018
WMECO$25 - $85 per REC 2013 - 2028 $25 - $85 per REC 2013 - 2028