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LONG-TERM DEBT (TABLES)
 12 Months Ended
Dec. 31, 2012
Notes To Consolidated Financial Statements [Abstract]  
Schedule of Maturities of Long-term Debt [Table Text Block]
(Millions of Dollars)NU CL&P NSTAR Electric PSNH WMECO
2013$ 731.7 $ 125.0 $ 1.7 $ - $ 55.0
2014  576.6   150.0   301.7   50.0   -
2015  216.7   162.0   4.7   -   50.0
2016  -   -   -   -   -
2017  745.0   250.0   400.0   70.0   -
Thereafter  4,559.8   1,540.3   899.9   879.5   435.0
Total$ 6,829.8 $ 2,227.3 $ 1,608.0 $ 999.5 $ 540.0
Schedule of Long-term Debt Instruments [Table Text Block]
        
 CL&PAs of December 31,
 (Millions of Dollars)2012 2011
 First Mortgage Bonds:     
  7.875% 1994 Series D due 2024$ 139.8 $ 139.8
  4.800% 2004 Series A due 2014  150.0   150.0
  5.750% 2004 Series B due 2034  130.0   130.0
  5.000% 2005 Series A due 2015  100.0   100.0
  5.625% 2005 Series B due 2035  100.0   100.0
  6.350% 2006 Series A due 2036  250.0   250.0
  5.375% 2007 Series A due 2017  150.0   150.0
  5.750% 2007 Series B due 2037  150.0   150.0
  5.750% 2007 Series C due 2017  100.0   100.0
  6.375% 2007 Series D due 2037  100.0   100.0
  5.650% 2008 Series A due 2018  300.0   300.0
  5.500% 2009 Series A due 2019  250.0   250.0
 Total First Mortgage Bonds  1,919.8   1,919.8
 Pollution Control Notes:     
  5.85%-5.95% Fixed Rate Tax Exempt due 2016-2028 (1)  -   116.4
  4.375% Fixed Rate Tax Exempt due 2028  120.5   120.5
  1.25% Fixed Rate Tax Exempt due 2028(2)  125.0   125.0
  1.55% Fixed Rate Tax Exempt due 2031(3)  62.0   62.0
 Total Pollution Control Notes  307.5   423.9
 Total First Mortgage Bonds and Pollution Control Notes  2,227.3   2,343.7
 Fees and Interest due for Spent Nuclear Fuel Disposal Costs  244.3   244.1
 CL&P Commercial Paper and Revolver Borrowings(4)  394.8   -
 Less Amounts due Within One Year(2)  (125.0)   (62.0)
 Unamortized Premiums and Discounts, Net  (3.6)   (4.0)
 CL&P Long-Term Debt$ 2,737.8 $ 2,521.8
        
 NSTAR ElectricAs of December 31,
 (Millions of Dollars)2012 2011(5)
 Debentures:     
  4.875% due 2012(6)$ - $ 400.0
  4.875% due 2014  300.0   300.0
  2.375% due 2022(6)  400.0   -
  5.625% due 2017  400.0   400.0
  5.75% due 2036  200.0   200.0
  5.50% due 2040  300.0   300.0
 Total Debentures  1,600.0   1,600.0
 Bonds:     
  7.375% Tax Exempt Sewage Facility Revenue Bonds, due 2015  8.0   8.7
 Less Amounts due Within One Year  (1.7)   (400.7)
 Unamortized Premiums and Discounts, Net  (5.4)   (4.7)
 NSTAR Electric Long-Term Debt$ 1,600.9 $ 1,203.3
        
 PSNHAs of December 31,
 (Millions of Dollars)2012 2011
 First Mortgage Bonds:     
  5.25% 2004 Series L due 2014$ 50.0 $ 50.0
  5.60% 2005 Series M due 2035  50.0   50.0
  6.15% 2007 Series N due 2017  70.0   70.0
  6.00% 2008 Series O due 2018  110.0   110.0
  4.50% 2009 Series P due 2019  150.0   150.0
  4.05% 2011 Series Q due 2021  122.0   122.0
  3.20% 2011 Series R due 2021  160.0   160.0
 Total First Mortgage Bonds  712.0   712.0
 Pollution Control Revenue Bonds:     
  4.75% - 5.45% Tax Exempt Series B and C due 2021  198.2   198.2
  Adjustable Rate Series A due 2021  89.3   89.3
 Total Pollution Control Revenue Bonds  287.5   287.5
 Unamortized Premiums and Discounts, Net  (1.6)   (1.8)
 PSNH Long-Term Debt$ 997.9 $ 997.7

        
 WMECOAs of December 31,
 (Millions of Dollars)2012 2011
 Pollution Control Revenue Bonds and Other Notes:     
  5.85% Tax Exempt PCRBs 1993 Series A, due 2028 (7)$ - $ 53.8
  5.00% Senior Notes Series A, due 2013  55.0   55.0
  5.90% Senior Notes Series B, due 2034  50.0   50.0
  5.24% Senior Notes Series C, due 2015  50.0   50.0
  6.70% Senior Notes Series D, due 2037  40.0   40.0
  5.10% Senior Notes Series E, due 2020  95.0   95.0
  3.50% Senior Notes Series F, due 2021 (8)  250.0   100.0
 Total Pollution Control Revenue Bonds and Other Notes  540.0   443.8
 Fees and Interest due for Spent Nuclear Fuel Disposal Costs  57.3   57.3
 Less Amounts due Within One Year  (55.0)   -
 Unamortized Premiums and Discounts, Net  8.0   (1.6)
 WMECO Long-Term Debt$ 550.3 $ 499.5
        
 OTHERAs of December 31,
 (Millions of Dollars)2012  2011
 Yankee Gas - First Mortgage Bonds:     
  7.19% Series E due 2012$ - $ 4.3
  8.48% Series B due 2022  20.0   20.0
  4.80% Series G due 2014  75.0   75.0
  5.26% Series H due 2019  50.0   50.0
  5.35% Series I due 2035  50.0   50.0
  6.90% Series J due 2018  100.0   100.0
  4.87% Series K due 2020  50.0   50.0
 Total First Mortgage Bonds  345.0   349.3
 Less Amounts due Within One Year  -   (4.3)
 Unamortized Premium  0.8   0.9
 Yankee Gas Long-Term Debt  345.8   345.9
        
 NSTAR Gas - First Mortgage Bonds:     
  9.95% Series J due 2020  25.0  N/A
  7.11% Series K due 2033  35.0  N/A
  7.04% Series M due 2017  25.0  N/A
  4.46% Series N due 2020  125.0  N/A
 NSTAR Gas Long-Term Debt  210.0  N/A
        
 Other - Notes and Debentures:     
  7.25% Senior Notes Series A due 2012 (NU Parent) (9)  -   263.0
  5.65% Senior Notes Series C due 2013 (NU Parent)  250.0   250.0
  Variable Rate Senior Notes Series D due 2013 (NU Parent) (9)  300.0   -
  4.50% Debentures due 2019 (NSTAR LLC)  350.0  N/A
  Spent Nuclear Fuel Obligation (CYAPC)  179.3  N/A
 Total Other Long-Term Debt  1,079.3   513.0
 Fair Value Adjustment(10)  259.9   2.3
 Less Amounts due Within One Year   (550.0)   (263.0)
 Less: Fair Value Adjustment - Current Portion(10)  (31.7)   (2.3)
 Total NU Long-Term Debt$ 7,200.2 $ 4,614.9