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LONG-TERM DEBT (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument Line Items    
Long-Term Debt - Current Portion $ 331,582,000 $ 66,286,000
Long-Term Debt 4,614,913,000 4,632,866,000
Maturities of Long-term Debt [Abstract]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 329,300,000  
Long-term Debt, Maturities, Repayments of Principal in Year Two 430,000,000  
Long-term Debt, Maturities, Repayments of Principal in Year Three 275,000,000  
Long-term Debt, Maturities, Repayments of Principal in Year Four 150,000,000  
Long-term Debt, Maturities, Repayments of Principal in Year Five 15,400,000  
Long-term Debt, Maturities, Repayments of Principal after Year Five 3,449,600,000  
LongTermDebtMaturitiesRepaymentsOfPrincipalTotal 4,649,300,000  
Long-term Debt, Description (1)        On October 24, 2011, CL&P issued $120.5 million of tax-exempt PCRBs carrying a coupon of 4.375 percent that mature on September 1, 2028 and issued $125 million of tax-exempt PCRBs carrying a coupon of 1.25 percent that mature on September 1, 2028 and are subject to mandatory tender for purchase on September 3, 2013. The $125 million of tax-exempt PCRBs were issued with an initial fixed rate term period ending on September 2, 2013, at which time CL&P expects to remarket the PCRBs. The proceeds from these two CL&P issuances were used to refund $245.5 million of PCRBs that carried a coupon of 5.85 percent and had a maturity date of September 1, 2028. (2)        On April 1, 2011, CL&P remarketed the $62 million of tax-exempt PCRBs for a one-year period. The PCRBs, which mature on May 1, 2031, carry a coupon rate of 1.25 percent during the current one-year fixed-rate period and are subject to mandatory tender for purchase on April 1, 2012, at which time CL&P expects to remarket the bonds. (3)        On May 26, 2011, PSNH issued $122 million of first mortgage bonds with a coupon rate of 4.05 percent and a maturity date of June 1, 2021, and used the proceeds to redeem $119.8 million of its tax-exempt 1992 Series D and 1993 Series E PCRBs, each with a maturity date of May 1, 2021 and a coupon rate of 6 percent. The utility plant of CL&P, PSNH and Yankee Gas is subject to the lien of each company's respective first mortgage bond indenture. The CL&P, PSNH and WMECO tax-exempt bonds contain call provisions providing call prices ranging between 100 percent and 102 percent of par. All other long-term debt securities are subject to make-whole provisions. As of December 31, 2011, CL&P had $423.9 million of tax-exempt PCRBs outstanding, $70 million of which is secured by second mortgage liens on transmission assets, junior to the liens of its first mortgage bond indenture. CL&P has $307.5 million of tax-exempt PCRBs secured by first mortgage bonds. If CL&P failed to meet its obligations under the PCRBs, then these first mortgage bonds would become outstanding. As of December 31, 2011, PSNH had $287.5 million in PCRBs outstanding. PSNH's obligation to repay each series of PCRBs is secured by first mortgage bonds and bond insurance. Each such series of first mortgage bonds contains similar terms and provisions as the applicable series of PCRBs. If PSNH failed to meet its obligations under the PCRBs, then these first mortgage bonds would become outstanding. The 2001 Series A PCRBs, in the aggregate principal amount of $89.3 million, bears interest at a rate that is periodically set pursuant to auctions. The Company is not obligated to purchase these PCRBs, which mature in 2021, from the remarketing agent. The weighted average effective interest rate on PSNH's Series A variable-rate PCRBs was 0.21 percent in 2011 and 0.34 percent in 2010. NU's, including CL&P, PSNH and WMECO, long-term debt agreements provide that NU and certain of its subsidiaries must comply with certain financial and non-financial covenants as are customarily included in such agreements, including a consolidated debt to total capitalization ratio. NU and these subsidiaries were in compliance with these covenants as of December 31, 2011. Yankee Gas has certain long-term debt agreements that contain cross-default provisions applicable to all of Yankee Gas’ outstanding first mortgage bond series. The cross-default provisions on Yankee Gas’ Series B Bonds would be triggered if Yankee Gas were to default on a payment due on indebtedness in excess of $2 million. The cross-default provisions on all other series of Yankee Gas’ first mortgage bonds would be triggered if Yankee Gas were to default in a payment due on indebtedness in excess of $10 million. No debt issuances of CL&P, PSNH, WMECO or NU parent contain cross-default provisions as of December 31, 2011. The fair value adjustment relates to the NU parent 7.25 percent note, due 2012 in the amount of $263 million, that is hedged with a fixed to floating interest rate swap. The change in fair value of the interest component of the debt was recorded as an adjustment to Long-Term Debt (Long-Term Debt - Current Portion as of December 31, 2011 since the note was due within one year) with an equal and offsetting adjustment to Derivative Assets for the change in fair value of the fixed to floating interest rate swap. Spent Nuclear Fuel Obligation: Under the Nuclear Waste Policy Act of 1982, CL&P and WMECO must pay the DOE for the costs of disposal of spent nuclear fuel and high-level radioactive waste for the period prior to the sale of their ownership shares in the Millstone nuclear power stations. The DOE is responsible for the selection and development of repositories for, and the disposal of, spent nuclear fuel and high-level radioactive waste. For nuclear fuel used to generate electricity prior to April 7, 1983 (Prior Period Spent Nuclear Fuel) for CL&P and WMECO, an accrual has been recorded for the full liability, and payment must be made by CL&P and WMECO to the DOE prior to the first delivery of spent fuel to the DOE. After the sale of Millstone, CL&P and WMECO remained responsible for their share of the disposal costs associated with the Prior Period Spent Nuclear Fuel. Until such payment to the DOE is made, the outstanding liability will continue to accrue interest at the 3-month Treasury bill yield rate. Fees due to the DOE for the disposal of Prior Period Spent Nuclear Fuel as of December 31, 2011 and 2010 are included in Long-Term Debt, including accumulated interest costs of $219.3 million and $218.9 million ($177.6 million and $177.3 million for CL&P and $41.7 million and $41.6 million for WMECO), respectively. WMECO maintains a trust that holds marketable securities to fund amounts due to the DOE for the disposal of WMECO's Prior Period Spent Nuclear Fuel. For further information on this trust, see Note 5, "Marketable Securities," to the consolidated financial statements.  
Total First Mortgage Bonds [Member]
   
Debt Instrument Line Items    
Long-Term Debt 349,300,000 353,600,000
Fair Value Adjustment [Member]
   
Debt Instrument Line Items    
Long-Term Debt 2,300,000 11,800,000
Total Other Long-Term Debt [Member]
   
Debt Instrument Line Items    
Long-Term Debt 595,900,000 875,100,000
Total Other [Member]
   
Debt Instrument Line Items    
Long-Term Debt 513,000,000 513,000,000
Series B due 2022 8.48% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 20,000,000 20,000,000
Series E due 2012 7.19% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 4,300,000 8,600,000
Series G due 2014 4.80% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 75,000,000 75,000,000
Series H due 2019 5.26% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 50,000,000 50,000,000
Series I due 2035 5.35% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 50,000,000 50,000,000
Series J due 2018 6.90% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 100,000,000 100,000,000
Series K due 2020 4.87% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 50,000,000 50,000,000
Series A due 2012 7.25% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 263,000,000 263,000,000
Series C due 2013 5.65% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 250,000,000 250,000,000
Public Service Company Of New Hampshire [Member]
   
Debt Instrument Line Items    
Long-Term Debt 997,722,000 836,365,000
Maturities of Long-term Debt [Abstract]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 0  
Long-term Debt, Maturities, Repayments of Principal in Year Two 0  
Long-term Debt, Maturities, Repayments of Principal in Year Three 50,000,000  
Long-term Debt, Maturities, Repayments of Principal in Year Four 0  
Long-term Debt, Maturities, Repayments of Principal in Year Five 0  
Long-term Debt, Maturities, Repayments of Principal after Year Five 949,500,000  
LongTermDebtMaturitiesRepaymentsOfPrincipalTotal 999,500,000  
Public Service Company Of New Hampshire [Member] | Series L 2004 Due 2014 5.25% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 50,000,000 50,000,000
Public Service Company Of New Hampshire [Member] | Series M 2005 Due 2035 5.60% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 50,000,000 50,000,000
Public Service Company Of New Hampshire [Member] | Series N 2007 Due 2017 6.15% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 70,000,000 70,000,000
Public Service Company Of New Hampshire [Member] | Series O 2008 Due 2018 6.00% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 110,000,000 110,000,000
Public Service Company Of New Hampshire [Member] | Series P 2009 Due 2019 4.50% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 150,000,000 150,000,000
Public Service Company Of New Hampshire [Member] | Adjustablerateseriesadue 2021 [Member]
   
Debt Instrument Line Items    
Long-Term Debt 89,300,000 89,300,000
Public Service Company Of New Hampshire [Member] | Total First Mortgage Bonds [Member]
   
Debt Instrument Line Items    
Long-Term Debt 712,000,000 430,000,000
Public Service Company Of New Hampshire [Member] | Unamortized Premiums and Discounts, Net [Member]
   
Debt Instrument Line Items    
Long-Term Debt (1,800,000) (900,000)
Public Service Company Of New Hampshire [Member] | Series Q 4.05% 2011 Due 2021 [Member]
   
Debt Instrument Line Items    
Long-Term Debt 122,000,000 0
Public Service Company Of New Hampshire [Member] | Series R 2011 3.30% due 2021 [Member]
   
Debt Instrument Line Items    
Long-Term Debt 160,000,000 0
Public Service Company Of New Hampshire [Member] | Total Pollution Control Revenue Bonds [Member]
   
Debt Instrument Line Items    
Long-Term Debt   407,300,000
Public Service Company Of New Hampshire [Member] | Tax Exempt Series D and E due 2021 6.00% [Member]
   
Debt Instrument Line Items    
Long-Term Debt   119,800,000
Public Service Company Of New Hampshire [Member] | Tax Exempt Series B and C Due 2021 4.75% to 5.45% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 198,200,000 198,200,000
The Connecticut Light And Power Company [Member]
   
Debt Instrument Line Items    
Long-Term Debt - Current Portion 62,000,000 62,000,000
Long-Term Debt 2,521,753,000 2,521,102,000
Maturities of Long-term Debt [Abstract]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 62,000,000  
Long-term Debt, Maturities, Repayments of Principal in Year Two 125,000,000  
Long-term Debt, Maturities, Repayments of Principal in Year Three 150,000,000  
Long-term Debt, Maturities, Repayments of Principal in Year Four 100,000,000  
Long-term Debt, Maturities, Repayments of Principal in Year Five 15,400,000  
Long-term Debt, Maturities, Repayments of Principal after Year Five 1,891,300,000  
LongTermDebtMaturitiesRepaymentsOfPrincipalTotal 2,343,700,000  
The Connecticut Light And Power Company [Member] | Series D 1994 Due 2024 7.875 % [Member]
   
Debt Instrument Line Items    
Long-Term Debt 139,800,000 139,800,000
The Connecticut Light And Power Company [Member] | Series A 2004 Due 2014 4.800% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 150,000,000 150,000,000
The Connecticut Light And Power Company [Member] | Series B 2004 Due 2034 5.750% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 130,000,000 130,000,000
The Connecticut Light And Power Company [Member] | Series A 2005 Due 2015 5.000% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 100,000,000 100,000,000
The Connecticut Light And Power Company [Member] | Series B 2005 Due 2035 5.625% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 100,000,000 100,000,000
The Connecticut Light And Power Company [Member] | Series A 2006 Due 2036 6.350% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 250,000,000 250,000,000
The Connecticut Light And Power Company [Member] | Series A 2007 Due 2017 5.375% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 150,000,000 150,000,000
The Connecticut Light And Power Company [Member] | Series B 2007 Due 2037 5.750% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 150,000,000 150,000,000
The Connecticut Light And Power Company [Member] | Series D 2007 Due 2037 6.375% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 100,000,000 100,000,000
The Connecticut Light And Power Company [Member] | Series A 2008 Due 2018 5.650% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 300,000,000 300,000,000
The Connecticut Light And Power Company [Member] | Series A 2009 Due 2019 5.500% [Member]
   
Debt Instrument Line Items    
Long-Term Debt 250,000,000 250,000,000
The Connecticut Light And Power Company [Member] | Fixed Rate 5.85% To 5.90% Due 2016 To 2022 [Member]
   
Debt Instrument Line Items    
Long-Term Debt 46,400,000 46,400,000
The Connecticut Light And Power Company [Member] | Fixed Rate Tax Exempt 5.95% Due 2028 [Member]
   
Debt Instrument Line Items    
Long-Term Debt 70,000,000 70,000,000
The Connecticut Light And Power Company [Member] | One-Year Fixed Rate Tax Exempt Due 2031 [Member]
   
Debt Instrument Line Items    
Long-Term Debt 62,000,000 62,000,000
The Connecticut Light And Power Company [Member] | Fees And Interest Due For Spent Nuclear Fuel Disposal Costs [Member]
   
Debt Instrument Line Items    
Long-Term Debt 244,100,000 243,800,000
The Connecticut Light And Power Company [Member] | Total First Mortgage Bonds [Member]
   
Debt Instrument Line Items    
Long-Term Debt 1,919,800,000 1,919,800,000
The Connecticut Light And Power Company [Member] | Total Pollution Control Bonds [Member]
   
Debt Instrument Line Items    
Long-Term Debt 423,900,000 423,900,000
The Connecticut Light And Power Company [Member] | Total First Mortgage Bonds and Pollution Control Notes [Member]
   
Debt Instrument Line Items    
Long-Term Debt 2,343,700,000 2,343,700,000
The Connecticut Light And Power Company [Member] | Unamortized Premiums and Discounts, Net [Member]
   
Debt Instrument Line Items    
Long-Term Debt (4,000,000) (4,400,000)
The Connecticut Light And Power Company [Member] | Serires C 2007 5.750% Due 2017 [Member]
   
Debt Instrument Line Items    
Long-Term Debt 100,000,000 100,000,000
The Connecticut Light And Power Company [Member] | Fixed Rate 4.375% due 2028 [Member]
   
Debt Instrument Line Items    
Long-Term Debt 120,500,000 0
The Connecticut Light And Power Company [Member] | Fixed Rate 1.25% due 2028 [Member]
   
Debt Instrument Line Items    
Long-Term Debt 125,000,000 0
The Connecticut Light And Power Company [Member] | Tax Exempt Fixed Rate Due 2028 5.85% [Member]
   
Debt Instrument Line Items    
Long-Term Debt   245,500,000
Western Massachusetts Electric Company [Member]
   
Debt Instrument Line Items    
Long-Term Debt 499,545,000 400,288,000
Maturities of Long-term Debt [Abstract]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 0  
Long-term Debt, Maturities, Repayments of Principal in Year Two 55,000,000  
Long-term Debt, Maturities, Repayments of Principal in Year Three 0  
Long-term Debt, Maturities, Repayments of Principal in Year Four 50,000,000  
Long-term Debt, Maturities, Repayments of Principal in Year Five 0  
Long-term Debt, Maturities, Repayments of Principal after Year Five 338,800,000  
LongTermDebtMaturitiesRepaymentsOfPrincipalTotal 443,800,000  
Western Massachusetts Electric Company [Member] | Tax Exempt 1993 Series A 5.85% Due 2028 [Member]
   
Debt Instrument Line Items    
Long-Term Debt 53,800,000 53,800,000
Western Massachusetts Electric Company [Member] | Senior Note Series A 5.00% Due 2013 [Member]
   
Debt Instrument Line Items    
Long-Term Debt 55,000,000 55,000,000
Western Massachusetts Electric Company [Member] | Senior Notes Series B 5.90% Due 2034 [Member]
   
Debt Instrument Line Items    
Long-Term Debt 50,000,000 50,000,000
Western Massachusetts Electric Company [Member] | Senior Notes Series C 5.24% Due 2015 [Member]
   
Debt Instrument Line Items    
Long-Term Debt 50,000,000 50,000,000
Western Massachusetts Electric Company [Member] | Senior Notes Series D 6.70% Due 2037 [Member]
   
Debt Instrument Line Items    
Long-Term Debt 40,000,000 40,000,000
Western Massachusetts Electric Company [Member] | Senior Notes Series E 5.10% Due 2020 [Member]
   
Debt Instrument Line Items    
Long-Term Debt 95,000,000 95,000,000
Western Massachusetts Electric Company [Member] | Fees And Interest Due For Spent Nuclear Fuel Disposal Costs [Member]
   
Debt Instrument Line Items    
Long-Term Debt 57,300,000 57,200,000
Western Massachusetts Electric Company [Member] | Unamortized Premiums and Discounts, Net [Member]
   
Debt Instrument Line Items    
Long-Term Debt (1,600,000) (700,000)
Western Massachusetts Electric Company [Member] | Senior Notes Series F 3.50% due 2021 [Member]
   
Debt Instrument Line Items    
Long-Term Debt 100,000,000 0
Western Massachusetts Electric Company [Member] | Total Pollution Control Notes and Other Notes [Member]
   
Debt Instrument Line Items    
Long-Term Debt $ 443,800,000 $ 343,800,000