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SEGMENT INFORMATION (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Segment Reporting Information Line Items     
Operating Revenues$ 1,114,892,000$ 1,243,337,000$ 3,397,624,000$ 3,694,182,000 
Depreciation And Amortization(129,600,000)(181,700,000)(363,200,000)(454,700,000) 
Operating Expenses(781,500,000)(862,000,000)(2,425,100,000)(2,634,900,000) 
Operating Income203,816,000199,633,000609,307,000604,641,000 
Total Interest Expense(63,932,000)(65,898,000)(184,716,000)(200,357,000) 
Other Income/(Loss), Net1,430,00010,118,00019,077,00019,726,000 
Income Tax Expense(49,883,000)(41,918,000)(157,934,000)(161,126,000) 
Net Income91,431,000101,935,000285,734,000262,884,000 
Net Income Attributable to Noncontrolling Interests(1,470,000)(1,411,000)(4,340,000)(4,204,000) 
Net Income Attributable to Controlling Interests89,961,000100,524,000281,394,000258,680,000 
Total Assets14,728,717,00014,297,600,00014,728,717,00014,297,600,00014,472,601,000
Investments in Property, Plant and Equipment  749,060,000677,579,000 
The Connecticut Light and Power Company [Member] | Electric Distribution Member
     
Segment Reporting Information Line Items     
Operating Revenues552,600,000662,500,0001,592,500,0001,917,800,000 
Depreciation And Amortization(40,000,000)(98,000,000)(117,700,000)(264,400,000) 
Operating Expenses(446,700,000)(504,600,000)(1,306,500,000)(1,505,900,000) 
Operating Income65,900,00059,900,000168,300,000147,500,000 
Total Interest Expense(18,000,000)(21,000,000)(53,000,000)(64,900,000) 
Interest Income600,000500,0001,900,0001,400,000 
Other Income/(Loss), Net(1,500,000)3,000,000(300,000)4,100,000 
Income Tax Expense(11,600,000)(10,100,000)(32,300,000)(31,400,000) 
Net Income35,400,00032,300,00084,600,00056,700,000 
Total Assets5,748,000,0005,664,700,0005,748,000,0005,664,700,000 
Investments in Property, Plant and Equipment  221,100,000192,400,000 
Public Service Company of New Hampshire [Member] | Electric Distribution Member
     
Segment Reporting Information Line Items     
Operating Revenues237,500,000256,100,000704,500,000713,300,000 
Depreciation And Amortization(46,400,000)(42,300,000)(121,000,000)(76,300,000) 
Operating Expenses(152,700,000)(173,700,000)(481,400,000)(532,200,000) 
Operating Income38,400,00040,100,000102,100,000104,800,000 
Total Interest Expense(8,400,000)(9,400,000)(25,500,000)(29,500,000) 
Interest Income200,000100,000700,000(1,900,000) 
Other Income/(Loss), Net2,900,0003,100,00010,100,0006,500,000 
Income Tax Expense(12,500,000)(10,400,000)(29,300,000)(28,400,000) 
Net Income20,600,00023,500,00058,100,00051,500,000 
Total Assets2,404,700,0002,319,500,0002,404,700,0002,319,500,000 
Investments in Property, Plant and Equipment  133,300,000185,600,000 
Western Massachusetts Electric Company [Member] | Electric Distribution Member
     
Segment Reporting Information Line Items     
Operating Revenues88,700,00091,900,000268,000,000264,100,000 
Depreciation And Amortization(12,900,000)(9,800,000)(29,500,000)(23,900,000) 
Operating Expenses(67,000,000)(72,900,000)(203,600,000)(211,100,000) 
Operating Income8,800,0009,200,00034,900,00029,100,000 
Total Interest Expense(3,900,000)(4,500,000)(12,400,000)(12,600,000) 
Interest Income100,000100,000300,000300,000 
Other Income/(Loss), Net(800,000)(800,000)(2,700,000)(1,200,000) 
Income Tax Expense(1,400,000)(300,000)(7,600,000)(6,700,000) 
Net Income2,800,0003,700,00012,500,0008,900,000 
Total Assets893,100,000868,700,000893,100,000868,700,000 
Investments in Property, Plant and Equipment  30,600,00026,000,000 
Electric Distribution Member
     
Segment Reporting Information Line Items     
Operating Revenues878,600,0001,010,500,0002,564,700,0002,895,000,000 
Depreciation And Amortization(99,300,000)(150,000,000)(268,100,000)(364,700,000) 
Operating Expenses(666,200,000)(751,300,000)(1,991,300,000)(2,249,000,000) 
Operating Income113,100,000109,200,000305,300,000281,300,000 
Total Interest Expense(30,300,000)(34,800,000)(90,900,000)(107,000,000) 
Interest Income900,000600,0002,700,000(200,000) 
Other Income/(Loss), Net600,0005,300,0007,100,0009,500,000 
Income Tax Expense(25,500,000)(20,900,000)(69,000,000)(66,500,000) 
Net Income58,800,00059,400,000155,200,000117,100,000 
Net Income Attributable to Noncontrolling Interests(800,000)(800,000)(2,400,000)(2,500,000) 
Net Income Attributable to Controlling Interests58,000,00058,600,000152,800,000114,600,000 
Total Assets9,041,300,0008,850,000,0009,041,300,0008,850,000,000 
Investments in Property, Plant and Equipment  385,000,000403,900,000 
Natural Gas Distribution [Member]
     
Segment Reporting Information Line Items     
Operating Revenues59,600,00059,600,000318,100,000304,900,000 
Depreciation And Amortization(7,200,000)(6,600,000)(20,200,000)(17,200,000) 
Operating Expenses(52,300,000)(52,500,000)(251,500,000)(244,300,000) 
Operating Income100,000500,00046,400,00043,400,000 
Total Interest Expense(5,300,000)(5,500,000)(15,600,000)(15,800,000) 
Interest Income0000 
Other Income/(Loss), Net400,000300,0001,200,000400,000 
Income Tax Expense1,800,0001,700,000(11,300,000)(11,900,000) 
Net Income(3,000,000)(3,000,000)20,700,00016,100,000 
Net Income Attributable to Noncontrolling Interests0000 
Net Income Attributable to Controlling Interests(3,000,000)(3,000,000)20,700,00016,100,000 
Total Assets1,456,800,0001,404,700,0001,456,800,0001,404,700,000 
Investments in Property, Plant and Equipment  73,600,00052,800,000 
The Connecticut Light and Power Company [Member] | Transmission [Member]
     
Segment Reporting Information Line Items     
Operating Revenues121,100,000126,700,000362,900,000374,300,000 
Depreciation And Amortization(15,400,000)(16,900,000)(48,700,000)(50,400,000) 
Operating Expenses(33,900,000)(38,300,000)(104,000,000)(108,300,000) 
Operating Income71,800,00071,500,000210,200,000215,600,000 
Total Interest Expense(17,200,000)(15,700,000)(46,300,000)(47,500,000) 
Interest Income100,000300,000300,0001,400,000 
Other Income/(Loss), Net(1,600,000)3,100,0002,500,0005,600,000 
Income Tax Expense(22,000,000)(22,500,000)(67,800,000)(70,300,000) 
Net Income31,100,00036,700,00098,900,000104,800,000 
Total Assets2,637,700,0002,588,800,0002,637,700,0002,588,800,000 
Investments in Property, Plant and Equipment  84,500,00081,800,000 
Public Service Company of New Hampshire [Member] | Transmission [Member]
     
Segment Reporting Information Line Items     
Operating Revenues22,100,00020,900,00064,800,00060,600,000 
Depreciation And Amortization(2,900,000)(2,500,000)(8,500,000)(7,800,000) 
Operating Expenses(9,100,000)(8,700,000)(25,100,000)(24,500,000) 
Operating Income10,100,0009,700,00031,200,00028,300,000 
Total Interest Expense(2,000,000)(2,100,000)(5,700,000)(6,300,000) 
Interest Income00100,000200,000 
Other Income/(Loss), Net200,000500,0001,300,0001,100,000 
Income Tax Expense(3,300,000)(2,800,000)(10,200,000)(8,600,000) 
Net Income5,000,0005,300,00016,700,00014,700,000 
Total Assets536,100,000477,500,000536,100,000477,500,000 
Investments in Property, Plant and Equipment  34,100,00032,400,000 
Western Massachusetts Electric Company [Member] | Transmission [Member]
     
Segment Reporting Information Line Items     
Operating Revenues15,800,00011,800,00041,600,00032,300,000 
Depreciation And Amortization(1,200,000)(2,600,000)(7,100,000)(5,700,000) 
Operating Expenses(3,600,000)(3,500,000)(10,100,000)(10,100,000) 
Operating Income11,000,0005,700,00024,400,00016,500,000 
Total Interest Expense(2,100,000)(1,100,000)(4,600,000)(3,600,000) 
Interest Income000200,000 
Other Income/(Loss), Net(100,000)1,400,0002,700,0002,100,000 
Income Tax Expense(3,200,000)(2,400,000)(8,400,000)(5,900,000) 
Net Income5,600,0003,600,00014,100,0009,300,000 
Total Assets526,700,000300,000,000526,700,000300,000,000 
Investments in Property, Plant and Equipment  122,900,00051,700,000 
Transmission [Member]
     
Segment Reporting Information Line Items     
Operating Revenues159,100,000159,400,000469,400,000467,200,000 
Depreciation And Amortization(19,500,000)(22,000,000)(64,300,000)(63,900,000) 
Operating Expenses(46,700,000)(50,500,000)(139,200,000)(142,800,000) 
Operating Income92,900,00086,900,000265,900,000260,500,000 
Total Interest Expense(21,300,000)(18,900,000)(56,600,000)(57,500,000) 
Interest Income100,000400,000400,0001,800,000 
Other Income/(Loss), Net(1,100,000)5,000,0007,000,0009,000,000 
Income Tax Expense(28,500,000)(27,600,000)(86,400,000)(84,800,000) 
Net Income42,100,00045,800,000130,300,000129,000,000 
Net Income Attributable to Noncontrolling Interests(600,000)(600,000)(1,900,000)(1,700,000) 
Net Income Attributable to Controlling Interests41,500,00045,200,000128,400,000127,300,000 
Total Assets3,727,300,0003,376,300,0003,727,300,0003,376,300,000 
Investments in Property, Plant and Equipment  254,200,000170,600,000 
Other Segment [Member]
     
Segment Reporting Information Line Items     
Operating Revenues142,300,000131,700,000403,500,000389,700,000 
Depreciation And Amortization(4,400,000)(4,300,000)(12,700,000)(11,700,000) 
Operating Expenses(135,700,000)(128,400,000)(397,400,000)(361,300,000) 
Operating Income2,200,000(1,000,000)(6,600,000)16,700,000 
Total Interest Expense(8,100,000)(7,800,000)(25,300,000)(23,500,000) 
Interest Income1,300,0001,300,0004,000,0004,000,000 
Other Income/(Loss), Net86,300,000102,200,000321,200,000285,900,000 
Income Tax Expense4,100,0005,200,00011,900,0002,700,000 
Net Income85,800,00099,900,000305,200,000285,800,000 
Net Income Attributable to Noncontrolling Interests0000 
Net Income Attributable to Controlling Interests85,800,00099,900,000305,200,000285,800,000 
Total Assets6,186,800,0006,113,900,0006,186,800,0006,113,900,000 
Investments in Property, Plant and Equipment  36,300,00050,300,000 
Eliminations Segment [Member]
     
Segment Reporting Information Line Items     
Operating Revenues(124,700,000)(117,900,000)(358,100,000)(362,600,000) 
Depreciation And Amortization800,0001,200,0002,100,0002,800,000 
Operating Expenses119,400,000120,700,000354,300,000362,500,000 
Operating Income(4,500,000)4,000,000(1,700,000)2,700,000 
Total Interest Expense1,100,0001,100,0003,700,0003,400,000 
Interest Income(1,300,000)(1,300,000)(4,000,000)(5,100,000) 
Other Income/(Loss), Net(85,800,000)(103,700,000)(320,600,000)(285,500,000) 
Income Tax Expense(1,800,000)(300,000)(3,100,000)(600,000) 
Net Income(92,300,000)(100,200,000)(325,700,000)(285,100,000) 
Net Income Attributable to Noncontrolling Interests0000 
Net Income Attributable to Controlling Interests(92,300,000)(100,200,000)(325,700,000)(285,100,000) 
Total Assets(5,683,500,000)(5,447,300,000)(5,683,500,000)(5,447,300,000) 
Investments in Property, Plant and Equipment  00 
The Connecticut Light and Power Company [Member] | Total [Member]
     
Segment Reporting Information Line Items     
Interest Income700,000800,0002,200,0002,800,000 
Other Income/(Loss), Net(3,100,000)6,100,0002,200,0009,700,000 
Public Service Company of New Hampshire [Member] | Total [Member]
     
Segment Reporting Information Line Items     
Interest Income200,000100,000800,000(1,700,000) 
Other Income/(Loss), Net3,100,0003,600,00011,400,0007,600,000 
Western Massachusetts Electric Company [Member] | Total [Member]
     
Segment Reporting Information Line Items     
Interest Income100,000100,000300,000500,000 
Other Income/(Loss), Net(900,000)600,0000900,000 
Total [Member]
     
Segment Reporting Information Line Items     
Interest Income1,000,0001,000,0003,100,000500,000 
Other Income/(Loss), Net400,0009,100,00015,900,00019,300,000 
The Connecticut Light and Power Company [Member]
     
Segment Reporting Information Line Items     
Operating Revenues673,666,000789,249,0001,955,361,0002,292,146,000 
Depreciation And Amortization(55,400,000)(114,900,000)(166,400,000)(314,800,000) 
Operating Expenses(480,600,000)(542,900,000)(1,410,500,000)(1,614,200,000) 
Operating Income137,737,000131,425,000378,519,000363,081,000 
Total Interest Expense(35,219,000)(36,681,000)(99,270,000)(112,415,000) 
Other Income/(Loss), Net(2,356,000)6,938,0004,308,00012,616,000 
Income Tax Expense(33,634,000)(32,636,000)(100,057,000)(101,739,000) 
Net Income66,528,00069,046,000183,500,000161,543,000 
Total Assets8,385,745,0008,253,500,0008,385,745,0008,253,500,0008,255,192,000
Investments in Property, Plant and Equipment  305,595,000274,193,000 
Public Service Company of New Hampshire [Member]
     
Segment Reporting Information Line Items     
Operating Revenues259,648,000276,976,000769,309,000773,866,000 
Depreciation And Amortization(49,300,000)(44,800,000)(129,500,000)(84,100,000) 
Operating Expenses(161,800,000)(182,400,000)(506,500,000)(556,700,000) 
Operating Income48,468,00049,771,000133,343,000133,082,000 
Total Interest Expense(10,368,000)(11,453,000)(31,224,000)(35,834,000) 
Other Income/(Loss), Net3,293,0003,667,00012,112,0005,882,000 
Income Tax Expense(15,759,000)(13,231,000)(39,468,000)(36,950,000) 
Net Income25,634,00028,754,00074,763,00066,180,000 
Total Assets2,940,789,0002,797,000,0002,940,789,0002,797,000,0002,879,121,000
Investments in Property, Plant and Equipment  167,383,000217,954,000 
Western Massachusetts Electric Company [Member]
     
Segment Reporting Information Line Items     
Operating Revenues104,515,000103,719,000309,589,000296,400,000 
Depreciation And Amortization(14,100,000)(12,400,000)(36,600,000)(29,600,000) 
Operating Expenses(70,600,000)(76,400,000)(213,700,000)(221,200,000) 
Operating Income19,786,00014,864,00059,315,00045,574,000 
Total Interest Expense(5,992,000)(5,595,000)(17,026,000)(16,196,000) 
Other Income/(Loss), Net(722,000)747,000259,0001,512,000 
Income Tax Expense(4,638,000)(2,679,000)(15,977,000)(12,645,000) 
Net Income8,434,0007,337,00026,571,00018,245,000 
Total Assets1,419,813,0001,168,700,0001,419,813,0001,168,700,0001,199,559,000
Investments in Property, Plant and Equipment  $ 153,470,000$ 77,710,000 
Quantifying Prior Year Misstatements Corrected in Current Year Financial Statements [Abstract]     
Immaterial Error Correction  (1)        Distribution segment Net Income for the three months ended September 30, 2011 decreased by $3.2 million as compared to the three months ended September 30, 2010 related to a pre-tax charge to establish a reserve of $5.3 million to reflect a wholesale billing adjustment, $4.3 million of which related to prior period amounts.