INCOME TAXES (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current Federal Tax Expense (Benefit)	$ (30,900,000)	$ 3,000,000	$ 9,000,000
Current State and Local Tax Expense (Benefit)	17,600,000	(26,000,000)	(6,500,000)
Total Current Income Tax Expense (Benefit)	(13,300,000)	(23,000,000)	2,500,000
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred Federal Income Tax Expense (Benefit)	291,300,000	187,700,000	201,200,000
Deferred State and Local Income Tax Expense (Benefit)	800,000	9,100,000	9,700,000
Total Deferred Income Taxes	292,000,000	196,761,000	210,939,000
Investment Tax Credit	(3,900,000)	(2,800,000)	(3,000,000)
Income Tax Expense	274,926,000	170,953,000	210,409,000
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income Before Income Tax Expense	808,003,000	571,466,000	604,516,000
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	282,800,000	200,000,000	211,600,000
Tax Effect Of Differences [Abstract]
Income Tax Reconciliation, Nondeductible Expense, Depreciation	(10,800,000)	(14,200,000)	(9,500,000)
Investment Tax Credit	(3,900,000)	(2,800,000)	(3,000,000)
Income Tax Reconciliation, Tax Credits, Other	(3,800,000)	(3,500,000)	(3,800,000)
Income Tax Reconciliation, State and Local Income Taxes	4,400,000	22,100,000	12,500,000
Medicare Subsidy	0	0	15,600,000
Tax Asset Valuation Allowance / Reserve Adjustments	7,600,000	(33,100,000)	(10,500,000)
Income Tax Reconciliation, Other Adjustments	(1,400,000)	2,500,000	(2,500,000)
Income Tax Expense	274,926,000	170,953,000	210,409,000
Effective Income Tax Rate, Continuing Operations	34.00%	29.90%	34.80%
Deferred Tax Liabilities [Abstract]
Deferred Tax Liabilities Resulting From Property Tax Accruals And Other	89,600,000	58,900,000
Deferred Tax Liabilities, Property, Plant and Equipment	3,468,800,000	1,920,500,000
Deferred Tax Liabilities, Regulatory Amounts [Abstract]
Deferred Tax Liabilities Regulatory Assets Securitized Contract Termination Costs	16,600,000	39,600,000
Deferred Tax Liabilities Regulatory Assets Other Regulatory Deferrals	1,561,100,000	1,135,000,000
Deferred Tax Liabilities Regulatory Assets Tax Effect Tax Regulatory Assets	217,200,000	184,600,000
Deferred Tax Liabilities Regulatory Assets Derivative Assets	36,200,000	39,100,000
Goodwill Deferred Tax Liability	210,900,000	0
Deferred Tax Liabilities, Other	136,100,000	24,500,000
Deferred Tax Liabilities, Total	5,736,500,000	3,402,200,000
Deferred Tax Assets, Net [Abstract]
Deferred Tax Assets, Derivative Instruments	380,600,000	415,300,000
Deferred Tax Assets, Regulatory Assets and Liabilities	257,900,000	157,900,000
Deferred Tax Assets Employee Benefits	811,400,000	539,600,000
Deferred Tax Assets Tax Effect Tax Regulatory Assets	17,200,000	15,500,000
Deferred Tax Assets, Other	242,400,000	204,200,000
Deferred Tax Assets, Gross	2,134,700,000	1,556,500,000
Deferred Tax Assets, Valuation Allowance	4,200,000	4,600,000
Deferred Tax Assets, Net	2,130,500,000	1,551,900,000
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	64,200,000	45,400,000
Deferred Tax Assets, Operating Loss Carryforwards	214,600,000	178,600,000
Purchase Accounting Deferred Tax Asset	146,400,000	0
Operating Loss Carryforwards and Tax Credit Carryforwards [Abstract]
Operating Loss Carryforwards	606,900,000	510,200,000
Operating Loss Carryforwards, Valuation Allowance	300,000
Tax Credit Carryforward, Amount	3,800,000	6,600,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits, Beginning Balance	73,500,000	101,200,000	124,300,000
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	100,000		800,000
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	(800,000)	(35,700,000)
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	10,300,000	8,000,000	10,800,000
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities			(34,300,000)
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations			(400,000)
Unrecognized Tax Benefits, Ending Balance	83,100,000	73,500,000	101,200,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense and Accrued Interest [Abstract]
Unrecognized Tax Benefits, Interest on Income Taxes Expense	3,100,000	(2,800,000)	(24,800,000)
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	10,100,000	7,100,000
Tax Positions [Abstract]
State Tax Settlements In 2011	29,100,000
State Tax Settlements Tax Expense Reductions in 2011	22,400,000
State Tax Settlements In 2010	35,000,000
State Tax Settlements Tax Expense Reductions In 2010	6,000,000
Nstar Electric 2011 Federal Tax Refund	166,800,000
Tax Years [Abstract]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound	50,000,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Other Information	These estimated changes could have an impact on NU's and CL&P's 2013 earnings of zero to $6 million and zero to $16 million, respectively. Other companies’ impacts are not expected to be material.
State and Local Jurisdiction [Member]
Operating Loss Carryforwards and Tax Credit Carryforwards [Abstract]
Operating Loss Carryforwards	74,900,000
Tax Credit Carryforward, Amount	110,200,000	101,400,000
The Connecticut Light And Power Company [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current Federal Tax Expense (Benefit)	(47,800,000)	13,900,000	20,700,000
Current State and Local Tax Expense (Benefit)	3,100,000	(34,400,000)	(1,100,000)
Total Current Income Tax Expense (Benefit)	(44,700,000)	(20,500,000)	19,600,000
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred Federal Income Tax Expense (Benefit)	141,500,000	106,400,000	108,100,000
Deferred State and Local Income Tax Expense (Benefit)	(500,000)	6,200,000	7,000,000
Total Deferred Income Taxes	140,993,000	112,620,000	115,069,000
Investment Tax Credit	(1,900,000)	(2,100,000)	(2,300,000)
Income Tax Expense	94,437,000	90,033,000	132,438,000
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income Before Income Tax Expense	304,162,000	340,197,000	376,581,000
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	106,500,000	119,100,000	131,800,000
Tax Effect Of Differences [Abstract]
Income Tax Reconciliation, Nondeductible Expense, Depreciation	(9,000,000)	(8,100,000)	(6,100,000)
Investment Tax Credit	(1,900,000)	(2,100,000)	(2,300,000)
Income Tax Reconciliation, Tax Credits, Other	0	(100,000)	(100,000)
Income Tax Reconciliation, State and Local Income Taxes	100,000	4,000,000	8,500,000
Medicare Subsidy	0	0	7,800,000
Tax Asset Valuation Allowance / Reserve Adjustments	1,600,000	(22,300,000)	(4,700,000)
Income Tax Reconciliation, Other Adjustments	(2,900,000)	(500,000)	(2,500,000)
Income Tax Expense	94,437,000	90,033,000	132,438,000
Effective Income Tax Rate, Continuing Operations	31.00%	26.50%	35.20%
Deferred Tax Liabilities [Abstract]
Deferred Tax Liabilities Resulting From Property Tax Accruals And Other	44,400,000	41,900,000
Deferred Tax Liabilities, Property, Plant and Equipment	1,194,700,000	1,046,900,000
Deferred Tax Liabilities, Regulatory Amounts [Abstract]
Deferred Tax Liabilities Regulatory Assets Securitized Contract Termination Costs	0	0
Deferred Tax Liabilities Regulatory Assets Other Regulatory Deferrals	677,700,000	734,200,000
Deferred Tax Liabilities Regulatory Assets Tax Effect Tax Regulatory Assets	151,800,000	141,800,000
Deferred Tax Liabilities Regulatory Assets Derivative Assets	36,200,000	39,100,000
Goodwill Deferred Tax Liability	0	0
Deferred Tax Liabilities, Other	10,100,000	8,200,000
Deferred Tax Liabilities, Total	2,114,900,000	2,012,100,000
Deferred Tax Assets, Net [Abstract]
Deferred Tax Assets, Derivative Instruments	375,900,000	412,200,000
Deferred Tax Assets, Regulatory Assets and Liabilities	35,500,000	78,400,000
Deferred Tax Assets Employee Benefits	141,200,000	121,400,000
Deferred Tax Assets Tax Effect Tax Regulatory Assets	5,200,000	6,400,000
Deferred Tax Assets, Other	82,800,000	76,000,000
Deferred Tax Assets, Gross	753,000,000	812,300,000
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	30,400,000	32,400,000
Deferred Tax Assets, Operating Loss Carryforwards	82,000,000	85,500,000
Operating Loss Carryforwards and Tax Credit Carryforwards [Abstract]
Operating Loss Carryforwards	234,300,000	244,200,000
Tax Credit Carryforward, Amount	0	0
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits, Beginning Balance	46,500,000	80,800,000	89,000,000
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	0		0
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	0	(35,700,000)
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	2,500,000	1,400,000	5,300,000
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities			(13,500,000)
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations			0
Unrecognized Tax Benefits, Ending Balance	49,000,000	46,500,000	80,800,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense and Accrued Interest [Abstract]
Unrecognized Tax Benefits, Interest on Income Taxes Expense	1,300,000	(3,700,000)	(7,400,000)
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	4,000,000	2,700,000
Tax Positions [Abstract]
State Tax Settlements Tax Expense Reductions In 2010	4,000,000
Tax Years [Abstract]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound	39,000,000
The Connecticut Light And Power Company [Member] \| State and Local Jurisdiction [Member]
Operating Loss Carryforwards and Tax Credit Carryforwards [Abstract]
Operating Loss Carryforwards	0
Tax Credit Carryforward, Amount	75,200,000	68,600,000
Public Service Company Of New Hampshire [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current Federal Tax Expense (Benefit)	(900,000)	(25,800,000)	6,100,000
Current State and Local Tax Expense (Benefit)	3,400,000	100,000	5,600,000
Total Current Income Tax Expense (Benefit)	2,500,000	(25,700,000)	11,700,000
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred Federal Income Tax Expense (Benefit)	46,500,000	67,700,000	37,600,000
Deferred State and Local Income Tax Expense (Benefit)	12,000,000	7,900,000	1,600,000
Total Deferred Income Taxes	58,552,000	75,628,000	39,225,000
Investment Tax Credit	0	0	(100,000)
Income Tax Expense	60,993,000	49,945,000	50,801,000
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income Before Income Tax Expense	157,875,000	150,212,000	140,868,000
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	55,300,000	52,600,000	49,300,000
Tax Effect Of Differences [Abstract]
Income Tax Reconciliation, Nondeductible Expense, Depreciation	(300,000)	(4,400,000)	(3,200,000)
Investment Tax Credit	0	0	(100,000)
Income Tax Reconciliation, Tax Credits, Other	(3,800,000)	(3,400,000)	(3,600,000)
Income Tax Reconciliation, State and Local Income Taxes	10,000,000	5,200,000	4,700,000
Medicare Subsidy	0	0	3,800,000
Tax Asset Valuation Allowance / Reserve Adjustments	0	0	0
Income Tax Reconciliation, Other Adjustments	(200,000)	(100,000)	(100,000)
Income Tax Expense	60,993,000	49,945,000	50,801,000
Effective Income Tax Rate, Continuing Operations	38.60%	33.20%	36.10%
Deferred Tax Liabilities [Abstract]
Deferred Tax Liabilities Resulting From Property Tax Accruals And Other	6,800,000	4,500,000
Deferred Tax Liabilities, Property, Plant and Equipment	476,500,000	423,800,000
Deferred Tax Liabilities, Regulatory Amounts [Abstract]
Deferred Tax Liabilities Regulatory Assets Securitized Contract Termination Costs	7,900,000	29,700,000
Deferred Tax Liabilities Regulatory Assets Other Regulatory Deferrals	149,300,000	122,500,000
Deferred Tax Liabilities Regulatory Assets Tax Effect Tax Regulatory Assets	15,800,000	16,100,000
Deferred Tax Liabilities Regulatory Assets Derivative Assets	0	0
Goodwill Deferred Tax Liability	0	0
Deferred Tax Liabilities, Other	14,100,000	14,000,000
Deferred Tax Liabilities, Total	670,400,000	610,600,000
Deferred Tax Assets, Net [Abstract]
Deferred Tax Assets, Derivative Instruments	0	0
Deferred Tax Assets, Regulatory Assets and Liabilities	43,900,000	39,300,000
Deferred Tax Assets Employee Benefits	64,800,000	87,900,000
Deferred Tax Assets Tax Effect Tax Regulatory Assets	1,700,000	1,600,000
Deferred Tax Assets, Other	33,700,000	26,000,000
Deferred Tax Assets, Gross	218,400,000	218,600,000
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	2,900,000	3,000,000
Deferred Tax Assets, Operating Loss Carryforwards	71,400,000	60,800,000
Operating Loss Carryforwards and Tax Credit Carryforwards [Abstract]
Operating Loss Carryforwards	204,000,000	173,800,000
Tax Credit Carryforward, Amount	3,800,000	3,400,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense and Accrued Interest [Abstract]
Unrecognized Tax Benefits, Interest on Income Taxes Expense	0	(600,000)	100,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	0	0
Public Service Company Of New Hampshire [Member] \| State and Local Jurisdiction [Member]
Operating Loss Carryforwards and Tax Credit Carryforwards [Abstract]
Operating Loss Carryforwards	0
Tax Credit Carryforward, Amount	0	0
Western Massachusetts Electric Company [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current Federal Tax Expense (Benefit)	(24,700,000)	100,000	3,100,000
Current State and Local Tax Expense (Benefit)	3,400,000	300,000	2,500,000
Total Current Income Tax Expense (Benefit)	(21,300,000)	400,000	5,600,000
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred Federal Income Tax Expense (Benefit)	51,200,000	22,100,000	11,000,000
Deferred State and Local Income Tax Expense (Benefit)	2,700,000	1,000,000	0
Total Deferred Income Taxes	53,942,000	23,056,000	10,963,000
Investment Tax Credit	(500,000)	(300,000)	(300,000)
Income Tax Expense	32,140,000	23,186,000	16,325,000
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income Before Income Tax Expense	86,643,000	66,240,000	39,415,000
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	30,300,000	23,200,000	13,800,000
Tax Effect Of Differences [Abstract]
Income Tax Reconciliation, Nondeductible Expense, Depreciation	200,000	100,000	200,000
Investment Tax Credit	(500,000)	(300,000)	(300,000)
Income Tax Reconciliation, Tax Credits, Other	0	0	0
Income Tax Reconciliation, State and Local Income Taxes	4,000,000	900,000	1,600,000
Medicare Subsidy	0	0	1,500,000
Tax Asset Valuation Allowance / Reserve Adjustments	0	0	0
Income Tax Reconciliation, Other Adjustments	(1,900,000)	(700,000)	(500,000)
Income Tax Expense	32,140,000	23,186,000	16,325,000
Effective Income Tax Rate, Continuing Operations	37.10%	35.00%	41.40%
Deferred Tax Liabilities [Abstract]
Deferred Tax Liabilities Resulting From Property Tax Accruals And Other	5,100,000	3,400,000
Deferred Tax Liabilities, Property, Plant and Equipment	261,300,000	194,900,000
Deferred Tax Liabilities, Regulatory Amounts [Abstract]
Deferred Tax Liabilities Regulatory Assets Securitized Contract Termination Costs	3,300,000	10,000,000
Deferred Tax Liabilities Regulatory Assets Other Regulatory Deferrals	74,500,000	79,300,000
Deferred Tax Liabilities Regulatory Assets Tax Effect Tax Regulatory Assets	13,900,000	13,700,000
Deferred Tax Liabilities Regulatory Assets Derivative Assets	0	0
Goodwill Deferred Tax Liability	0	0
Deferred Tax Liabilities, Other	2,300,000	1,100,000
Deferred Tax Liabilities, Total	360,400,000	302,400,000
Deferred Tax Assets, Net [Abstract]
Deferred Tax Assets, Derivative Instruments	(1,700,000)	2,900,000
Deferred Tax Assets, Regulatory Assets and Liabilities	6,300,000	15,000,000
Deferred Tax Assets Employee Benefits	16,300,000	13,300,000
Deferred Tax Assets Tax Effect Tax Regulatory Assets	1,700,000	6,500,000
Deferred Tax Assets, Other	8,000,000	17,600,000
Deferred Tax Assets, Gross	48,900,000	59,200,000
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	3,200,000	3,900,000
Deferred Tax Assets, Operating Loss Carryforwards	15,100,000	0
Operating Loss Carryforwards and Tax Credit Carryforwards [Abstract]
Operating Loss Carryforwards	43,300,000	0
Tax Credit Carryforward, Amount	0	3,200,000
Western Massachusetts Electric Company [Member] \| State and Local Jurisdiction [Member]
Operating Loss Carryforwards and Tax Credit Carryforwards [Abstract]
Operating Loss Carryforwards	0
Tax Credit Carryforward, Amount	0	0
NSTAR Electric Company [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current Federal Tax Expense (Benefit)	93,500,000	64,900,000	94,800,000
Current State and Local Tax Expense (Benefit)	27,600,000	30,200,000	27,000,000
Total Current Income Tax Expense (Benefit)	121,100,000	95,100,000	121,800,000
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred Federal Income Tax Expense (Benefit)	11,400,000	74,800,000	41,700,000
Deferred State and Local Income Tax Expense (Benefit)	(7,100,000)	(2,800,000)	(100,000)
Total Deferred Income Taxes	4,264,000	72,006,000	41,612,000
Investment Tax Credit	(1,400,000)	(1,400,000)	(1,400,000)
Income Tax Expense	123,966,000	165,686,000	162,020,000
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income Before Income Tax Expense	314,208,000	418,180,000	410,595,000
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	110,000,000	146,400,000	143,700,000
Tax Effect Of Differences [Abstract]
Income Tax Reconciliation, Nondeductible Expense, Depreciation	0	0	0
Investment Tax Credit	(1,400,000)	(1,400,000)	(1,400,000)
Income Tax Reconciliation, Tax Credits, Other	0	0	0
Income Tax Reconciliation, State and Local Income Taxes	13,400,000	17,900,000	17,400,000
Medicare Subsidy	0	0	0
Tax Asset Valuation Allowance / Reserve Adjustments	0	0	0
Income Tax Reconciliation, Other Adjustments	2,000,000	2,800,000	2,300,000
Income Tax Expense	123,966,000	165,686,000	162,020,000
Effective Income Tax Rate, Continuing Operations	39.50%	39.60%	39.50%
Deferred Tax Liabilities [Abstract]
Deferred Tax Liabilities Resulting From Property Tax Accruals And Other	23,100,000	21,800,000
Deferred Tax Liabilities, Property, Plant and Equipment	1,079,300,000	987,800,000
Deferred Tax Liabilities, Regulatory Amounts [Abstract]
Deferred Tax Liabilities Regulatory Assets Securitized Contract Termination Costs	5,500,000	41,300,000
Deferred Tax Liabilities Regulatory Assets Other Regulatory Deferrals	379,600,000	400,600,000
Deferred Tax Liabilities Regulatory Assets Tax Effect Tax Regulatory Assets	20,900,000	21,900,000
Deferred Tax Liabilities Regulatory Assets Derivative Assets	0	0
Goodwill Deferred Tax Liability	181,000,000	187,800,000
Deferred Tax Liabilities, Other	30,200,000	34,800,000
Deferred Tax Liabilities, Total	1,719,600,000	1,696,000,000
Deferred Tax Assets, Net [Abstract]
Deferred Tax Assets, Derivative Instruments	5,800,000	1,300,000
Deferred Tax Assets, Regulatory Assets and Liabilities	123,600,000	114,900,000
Deferred Tax Assets Employee Benefits	116,300,000	115,300,000
Deferred Tax Assets Tax Effect Tax Regulatory Assets	6,000,000	6,900,000
Deferred Tax Assets, Other	26,000,000	36,100,000
Deferred Tax Assets, Gross	293,900,000	284,000,000
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	16,200,000	9,500,000
Deferred Tax Assets, Operating Loss Carryforwards	0	0
Operating Loss Carryforwards and Tax Credit Carryforwards [Abstract]
Operating Loss Carryforwards	0	0
Tax Credit Carryforward, Amount	0	0
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits, Beginning Balance	0	0	13,800,000
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	0		0
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	0	0
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	0	0	0
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities			(13,800,000)
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations			0
Unrecognized Tax Benefits, Ending Balance	0	0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense and Accrued Interest [Abstract]
Unrecognized Tax Benefits, Interest on Income Taxes Expense	0	2,000,000	(7,400,000)
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	0	700,000
NSTAR Electric Company [Member] \| State and Local Jurisdiction [Member]
Operating Loss Carryforwards and Tax Credit Carryforwards [Abstract]
Operating Loss Carryforwards	0
Tax Credit Carryforward, Amount	$ 0	$ 0

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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