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LONG-TERM DEBT (TABLES)
 12 Months Ended
Dec. 31, 2015
Notes To Consolidated Financial Statements [Abstract]  
Schedule of Maturities of Long-term Debt [Table Text Block]
(Millions of Dollars)Eversource CL&P NSTAR Electric PSNH WMECO
2016$ 200.0 $ - $ 200.0 $ - $ -
2017  745.0   250.0   400.0   70.0   -
2018  960.0   300.0   -   110.0   -
2019  800.0   250.0   -   150.0   -
2020  295.0   -   -   -   95.0
Thereafter  5,736.6   1,990.3   1,450.0   746.3   420.0
Total$ 8,736.6 $ 2,790.3 $ 2,050.0 $ 1,076.3 $ 515.0
Schedule of Long-term Debt Instruments [Table Text Block]
CL&PAs of December 31,
(Millions of Dollars)2015 2014
First Mortgage Bonds:     
 7.875% 1994 Series D due 2024$ 139.8 $ 139.8
 5.750% 2004 Series B due 2034  130.0   130.0
 5.000% 2005 Series A due 2015   -   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
 2.500% 2013 Series A due 2023  400.0   400.0
 4.300% 2014 Series A due 2044   250.0   250.0
 4.150% 2015 Series A due 2045  350.0   -
Total First Mortgage Bonds  2,669.8   2,419.8
Pollution Control Revenue Bonds:     
 4.375% Fixed Rate Tax Exempt due 2028  120.5   120.5
 1.550% Fixed Rate Tax Exempt due 2031   -   62.0
Total Pollution Control Revenue Bonds  120.5   182.5
Pre-1983 Spent Nuclear Fuel Obligation  -   244.5
Less Amounts due Within One Year  -   (162.0)
Unamortized Premiums and Discounts, Net  (10.7)   (4.8)
Unamortized Debt Issuance Costs(1)  (15.9)   (15.8)
CL&P Long-Term Debt(1)$ 2,763.7 $ 2,664.2
       
NSTAR ElectricAs of December 31,
(Millions of Dollars)2015 2014
Debentures:     
 5.750% due 2036$ 200.0 $ 200.0
 5.625% due 2017  400.0   400.0
 5.500% due 2040  300.0   300.0
 2.375% due 2022  400.0   400.0
 Variable Rate due 2016 (0.6036% and 0.4721% as of December 31, 2015 and 2014)  200.0   200.0
 4.400% due 2044   300.0   300.0
 3.250% due 2025  250.0   -
Total Debentures  2,050.0   1,800.0
Bonds:     
 7.375% Tax Exempt Sewage Facility Revenue Bonds, due 2015  -   4.7
Less Amounts due Within One Year  (200.0)   (4.7)
Unamortized Premiums and Discounts, Net  (8.5)   (7.3)
Unamortized Debt Issuance Costs(1)  (11.7)   (11.2)
NSTAR Electric Long-Term Debt(1)$ 1,829.8 $ 1,781.5
       
PSNHAs of December 31,
(Millions of Dollars)2015 2014
First Mortgage Bonds:     
 5.60% Series M due 2035$ 50.0 $ 50.0
 6.15% Series N due 2017  70.0   70.0
 6.00% Series O due 2018  110.0   110.0
 4.50% Series P due 2019  150.0   150.0
 4.05% Series Q due 2021  122.0   122.0
 3.20% Series R due 2021  160.0   160.0
 3.50% Series S due 2023   325.0   325.0
Total First Mortgage Bonds  987.0   987.0
Pollution Control Revenue Bonds:     
 Adjustable Rate Tax Exempt Series A due 2021 (0.193% and 0.175% as of December 31, 2015 and 2014)  89.3   89.3
Unamortized Premiums and Discounts, Net  0.1   -
Unamortized Debt Issuance Costs(1)  (5.4)   (6.3)
PSNH Long-Term Debt(1)$ 1,071.0 $ 1,070.0

WMECOAs of December 31,
(Millions of Dollars)2015 2014
Notes:     
 5.90% Senior Notes Series B, due 2034$ 50.0 $ 50.0
 5.24% Senior Notes Series C, due 2015  -   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  250.0   250.0
 3.88% Senior Notes Series G, due 2023  80.0   80.0
Total Notes  515.0   565.0
Pre-1983 Spent Nuclear Fuel Obligation  -   57.4
Less Amounts due Within One Year  -   (50.0)
Unamortized Premiums and Discounts, Net   5.2   6.1
Unamortized Debt Issuance Costs (1)  (2.9)   (3.3)
WMECO Long-Term Debt (1)$ 517.3 $ 575.2
       
OTHERAs of December 31,
(Millions of Dollars)2015  2014
Yankee Gas - First Mortgage Bonds:     
 8.48% Series B due 2022$ 20.0 $ 20.0
 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
 4.82% Series L due 2044   100.0   100.0
 3.35% Series M due 2025  75.0   -
Total First Mortgage Bonds  445.0   370.0
Unamortized Premium  0.4   0.6
Unamortized Debt Issuance Costs (1)  (1.7)   (1.5)
Yankee Gas Long-Term Debt (1)  443.7   369.1
       
NSTAR Gas - First Mortgage Bonds:     
 9.95% Series J due 2020  25.0   25.0
 7.11% Series K due 2033  35.0   35.0
 7.04% Series M due 2017  25.0   25.0
 4.46% Series N due 2020  125.0   125.0
 4.35% Series O due 2045  100.0   -
Total First Mortgage Bonds  310.0   210.0
Unamortized Debt Issuance Costs (1)  (0.8)   (0.6)
NSTAR Gas Long-Term Debt (1)  309.2   209.4
       
Eversource Parent - Notes and Debentures:     
 4.50% Debentures due 2019  350.0   350.0
 1.45% Senior Notes Series E due 2018  300.0   300.0
 2.80% Senior Notes Series F due 2023  450.0   450.0
 1.60% Senior Notes Series G due 2018  150.0   -
 3.15% Senior Notes Series H due 2025  300.0   -
 Eversource Parent Commercial Paper Borrowings  -   446.3
Total Eversource Parent Notes and Debentures  1,550.0   1,546.3
Pre-1983 Spent Nuclear Fuel Obligation (CYAPC)  179.5   179.4
Fair Value Adjustment (2)  173.5   202.3
Less Fair Value Adjustment - Current Portion (2)  (28.9)   (28.9)
Unamortized Premiums and Discounts, Net   (1.3)   (1.2)
Unamortized Debt Issuance Costs (1)  (1.9)   1.1
Total Other Long-Term Debt (1)$ 2,623.8 $ 2,477.5
       
Total Eversource Long-Term Debt (1)$ 8,805.6 $ 8,568.4