PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSIONS (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Accrued Pension, PBOP and SERP	$ 2,130,497,000	$ 1,326,037,000
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
Description of allocation of assets to subsidiaries	CL&P, PSNH and WMECO participate in the NUSCO Pension Plan and NUSCO PBOP Plans. Each company participating in the plans is allocated a portion of the total plan assets. As of December 31, 2012 and 2011, the NUSCO Pension Plan has total assets of $2,342.6 million and $2,005.9 million, respectively. CL&P, PSNH and WMECO’s portion of these total plan assets were 40 percent, 17 percent and 9 percent, respectively, as of December 31, 2012, and 43 percent, 14 percent and 10 percent, respectively, as of December 31, 2011. The NUSCO PBOP Plans had total plan assets of $334.9 million and $285.4 million as of December 31, 2012 and 2011, respectively. CL&P, PSNH and WMECO’s share of these assets were 39 percent, 21 percent and 9 percent, respectively, as of both December 31, 2012 and 2011.
Pension Plans Defined Benefit Member
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation	(1,409,700,000)
Benefit Obligation Beginning Balance	(3,098,900,000)	(2,820,900,000)
Defined Benefit Plan Service Cost	(84,300,000)	(55,400,000)	(51,000,000)
Defined Benefit Plan Interest Cost	(198,300,000)	(153,300,000)	(152,600,000)
Defined Benefit Plan, Actuarial Net (Gains) Losses	(429,700,000)	(206,100,000)
Defined Benefit Plan, Benefits Paid	187,700,000	134,400,000
Defined Benefit Plan, Payments SERP	4,200,000	2,400,000
Defined Benefit Plan Benefits Paid Lump Sum		(134,400,000)
Benefit Obligation Ending Balance	(5,022,800,000)	(3,098,900,000)	(2,820,900,000)
DefinedBenefitPlanSettlementsBenefitObligation	6,200,000
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan Service Cost	84,300,000	55,400,000	51,000,000
Defined Benefit Plan Interest Cost	198,300,000	153,300,000	152,600,000
Defined Benefit Plan, Expected Return on Plan Assets	(220,900,000)	(170,800,000)	(182,600,000)
Defined Benefit Plan, Amortization of Gains (Losses)	172,400,000	84,200,000	53,500,000
Defined Benefit Plan Amortization Of Prior Service Cost Credit	7,900,000	9,700,000	9,900,000
Defined Benefit Plan Net Periodic Benefit Cost	242,000,000	131,800,000	84,400,000
Amount Capitalized Pension Expense	70,600,000	29,700,000	16,900,000
us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments	2,200,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets	984,700,000
Fair Value of Plan Assets Beginning Balance	2,005,900,000	1,977,600,000
Defined Benefit Plan, Actual Return on Plan Assets	386,000,000	19,100,000
Defined Benefit Plan, Contributions by Employer	222,400,000	143,600,000
Defined Benefit Plan, Benefits Paid	(187,700,000)	(134,400,000)
Defined Benefit Plan Benefits Paid Lump Sum		134,400,000
Fair Value of Plan Assets Ending Balance	3,411,300,000	2,005,900,000	1,977,600,000
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Defined Benefit Plan, Funded Status of Plan	(1,611,500,000)	(1,093,000,000)
Defined Benefit Plan, Accumulated Benefit Obligation	4,622,100,000	2,810,600,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	2,005,900,000	1,977,600,000
Fair Value of Plan Assets Ending Balance	3,411,300,000	2,005,900,000	1,977,600,000
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	19,100,000	23,000,000
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax	(7,800,000)	(4,800,000)
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Benefit Cost, before Tax	(200,000)	(300,000)
RegulatoryAssetDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	245,700,000	334,800,000
RegulatoryAssetReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax	(164,600,000)	(79,400,000)
RegulatoryAssetAmortizationOfDefinedBenefitPlanNetPriorServiceCostCreditRecognizedInNetPeriodicBenefitCostBeforeTax	(7,700,000)	(9,400,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
ension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	81,500,000	70,200,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	1,200,000	1,400,000
DefinedBenefitPlanRegulatoryAssetIncomeNetGainsLossesBeforeTax	1,973,800,000	1,126,100,000
DefinedBenefitPlanRegulatoryAssetNetPriorServiceCostCreditBeforeTax	21,200,000	29,300,000
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Defined Benefit Plan, Amortization of Net Gains (Losses)	9,300,000
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)	200,000
RegulatoryAssetDefinedBenefitPlanAmortizationOfNetGainsLosses	200,800,000
RegulatoryAssetDefinedBenefitPlanAmortizationOfNetPriorServiceCostCredit	3,900,000
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	238,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	257,300,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	252,400,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	261,200,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	270,600,000
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	1,510,200,000
DescriptionOfDefinedContributionPensionAndOtherPostretirementPlans	NU’s policy is to annually fund the NUSCO and NSTAR Pension Plans in an amount at least equal to an amount that will satisfy federal requirements. NU contributed $197.4 million to the NUSCO Pension Plan in 2012, of which $87.7 million was contributed by PSNH. NSTAR Electric contributed $25 million to the NSTAR Pension Plan for the year ended December 31, 2012. Based on the current status of the NUSCO Pension Plan, NU anticipates making a contribution of approximately $203 million in 2013, of which $107 million is required to meet minimum federal funding requirements. NSTAR Electric anticipates making a contribution of approximately $82 million in 2013 to the NSTAR Pension Plan, of which $38 million is required to meet minimum federal funding requirements.
Pension Plans Defined Benefit Member \| Fair Value Inputs Level 1 Member
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	460,100,000	292,600,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	460,100,000	292,600,000
Pension Plans Defined Benefit Member \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	1,508,800,000	629,800,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	1,508,800,000	629,800,000
Pension Plans Defined Benefit Member \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Beginning Balance	1,102,500,000	1,033,900,000
Fair Value of Plan Assets Ending Balance	1,560,000,000	1,102,500,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	1,102,500,000	1,033,900,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	108,500,000	6,400,000
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	23,000,000	17,000,000
Defined Benefit Plan, Purchases, Sales, and Settlements	47,000,000	45,200,000
Fair Value of Plan Assets Ending Balance	1,560,000,000	1,102,500,000
Level3PlanAssetsAssumedinMerger	279,000,000
Pension Plans Defined Benefit Member \| United States Equity Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	909,900,000	492,900,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	909,900,000	492,900,000
Pension Plans Defined Benefit Member \| United States Equity Securities [Member] \| Fair Value Inputs Level 1 Member
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	336,500,000	218,700,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	336,500,000	218,700,000
Pension Plans Defined Benefit Member \| United States Equity Securities [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	302,800,000	14,800,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	302,800,000	14,800,000
Pension Plans Defined Benefit Member \| United States Equity Securities [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Beginning Balance	259,400,000	266,000,000
Fair Value of Plan Assets Ending Balance	270,600,000	259,400,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	259,400,000	266,000,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	11,200,000	(6,600,000)
Fair Value of Plan Assets Ending Balance	270,600,000	259,400,000
Pension Plans Defined Benefit Member \| International Equity Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	456,700,000	241,900,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	456,700,000	241,900,000
Pension Plans Defined Benefit Member \| International Equity Securities [Member] \| Fair Value Inputs Level 1 Member
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	42,000,000	20,000,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	42,000,000	20,000,000
Pension Plans Defined Benefit Member \| International Equity Securities [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	362,600,000	221,900,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	362,600,000	221,900,000
Pension Plans Defined Benefit Member \| International Equity Securities [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	52,100,000
Level 3 Rollforwards
Defined Benefit Plan, Actual Return on Plan Assets Still Held	10,700,000
Fair Value of Plan Assets Ending Balance	52,100,000
Level3PlanAssetsAssumedinMerger	41,400,000
Pension Plans Defined Benefit Member \| Emergining Markets Equity Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	135,300,000	66,600,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	135,300,000	66,600,000
Pension Plans Defined Benefit Member \| Emergining Markets Equity Securities [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	135,300,000	66,600,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	135,300,000	66,600,000
Pension Plans Defined Benefit Member \| Private Equity Funds [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	294,600,000	266,400,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	294,600,000	266,400,000
Pension Plans Defined Benefit Member \| Private Equity Funds [Member] \| Fair Value Inputs Level 1 Member
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	26,700,000	11,300,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	26,700,000	11,300,000
Pension Plans Defined Benefit Member \| Private Equity Funds [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Beginning Balance	255,100,000	229,500,000
Fair Value of Plan Assets Ending Balance	267,900,000	255,100,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	255,100,000	229,500,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	17,000,000	20,000,000
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	15,000,000	19,500,000
Defined Benefit Plan, Purchases, Sales, and Settlements	(19,200,000)	(13,900,000)
Fair Value of Plan Assets Ending Balance	267,900,000	255,100,000
Pension Plans Defined Benefit Member \| Fixed Income Debt Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	999,200,000	562,700,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	999,200,000	562,700,000
Pension Plans Defined Benefit Member \| Fixed Income Debt Securities [Member] \| Fair Value Inputs Level 1 Member
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	54,900,000	17,800,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	54,900,000	17,800,000
Pension Plans Defined Benefit Member \| Fixed Income Debt Securities [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	629,200,000	268,700,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	629,200,000	268,700,000
Pension Plans Defined Benefit Member \| Fixed Income Debt Securities [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Beginning Balance	276,200,000	247,600,000
Fair Value of Plan Assets Ending Balance	315,100,000	276,200,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	276,200,000	247,600,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	42,100,000	(1,500,000)
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	700,000	(2,800,000)
Defined Benefit Plan, Purchases, Sales, and Settlements	(3,900,000)	32,900,000
Fair Value of Plan Assets Ending Balance	315,100,000	276,200,000
Pension Plans Defined Benefit Member \| Hedge Funds [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	418,900,000	240,000,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	418,900,000	240,000,000
Pension Plans Defined Benefit Member \| Hedge Funds [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Beginning Balance	240,000,000	247,100,000
Fair Value of Plan Assets Ending Balance	418,900,000	240,000,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	240,000,000	247,100,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	21,800,000	(7,100,000)
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	(300,000)
Defined Benefit Plan, Purchases, Sales, and Settlements	30,800,000
Fair Value of Plan Assets Ending Balance	418,900,000	240,000,000
Level3PlanAssetsAssumedinMerger	126,600,000
Pension Plans Defined Benefit Member \| Real Estate [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	314,300,000	154,400,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	314,300,000	154,400,000
Pension Plans Defined Benefit Member \| Real Estate [Member] \| Fair Value Inputs Level 1 Member
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	0	24,800,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	0	24,800,000
Pension Plans Defined Benefit Member \| Real Estate [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	78,900,000	57,800,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	78,900,000	57,800,000
Pension Plans Defined Benefit Member \| Real Estate [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Beginning Balance	71,800,000	43,700,000
Fair Value of Plan Assets Ending Balance	235,400,000	71,800,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	71,800,000	43,700,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	5,700,000	1,600,000
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	7,600,000	300,000
Defined Benefit Plan, Purchases, Sales, and Settlements	39,300,000	26,200,000
Fair Value of Plan Assets Ending Balance	235,400,000	71,800,000
Level3PlanAssetsAssumedinMerger	111,000,000
Pension Plans Defined Benefit Member \| Assetsrelatedto401h [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	117,600,000	19,000,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	117,600,000	19,000,000
Other Postretirement Benefit Plans Defined Benefit Member
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation	(770,600,000)
Benefit Obligation Beginning Balance	(520,900,000)	(489,900,000)
Defined Benefit Plan Service Cost	(15,700,000)	(9,200,000)	(8,500,000)
Defined Benefit Plan Interest Cost	(49,000,000)	(25,700,000)	(26,800,000)
Defined Benefit Plan, Actuarial Net (Gains) Losses	70,900,000	(30,100,000)
Defined Benefit Plan, Benefits Paid	58,200,000	38,100,000
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received	(6,200,000)	(4,100,000)
Benefit Obligation Ending Balance	(1,233,300,000)	(520,900,000)	(489,900,000)
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan Service Cost	15,700,000	9,200,000	8,500,000
Defined Benefit Plan Interest Cost	49,000,000	25,700,000	26,800,000
Defined Benefit Plan, Expected Return on Plan Assets	(39,200,000)	(21,600,000)	(21,700,000)
Defined Benefit Plan, Amortization of Gains (Losses)	36,000,000	19,000,000	16,700,000
Defined Benefit Plan Amortization Of Transition Obligations Assets	12,200,000	11,600,000	11,600,000
Defined Benefit Plan Amortization Of Prior Service Cost Credit	(1,400,000)	(300,000)	(300,000)
Defined Benefit Plan Net Periodic Benefit Cost	72,300,000	43,600,000	41,600,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets	330,400,000
Fair Value of Plan Assets Beginning Balance	285,400,000	278,500,000
Defined Benefit Plan, Actual Return on Plan Assets	78,800,000	(2,500,000)
Defined Benefit Plan, Contributions by Employer	72,700,000	47,500,000
Defined Benefit Plan, Benefits Paid	(58,200,000)	(38,100,000)
Fair Value of Plan Assets Ending Balance	709,100,000	285,400,000	278,500,000
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Defined Benefit Plan, Funded Status of Plan	(524,200,000)	(235,500,000)
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Defined Benefit Plan, Description of Direction and Pattern of Change for Assumed Health Care Cost Trend Rate	The NU consolidated amounts include the NSTAR PBOP Plan from the date of the merger, April 10, 2012, through December 31, 2012. For the NUSCO PBOP Plans, the health care cost trend assumption is 7 percent, subsequently decreasing 50 basis points per year to an ultimate rate of 5 percent in 2017. For the NSTAR PBOP Plan, the health care cost trend assumption is 7.10 percent, subsequently decreasing to an ultimate rate of 4.50 percent in 2024.
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation	126,500,000
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation	(101,700,000)
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components	8,900,000
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components	(6,900,000)
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	285,400,000	278,500,000
Fair Value of Plan Assets Ending Balance	709,100,000	285,400,000	278,500,000
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	(1,800,000)	4,000,000
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax	(1,100,000)	(900,000)
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Transition Asset (Obligation), Recognized in Net Periodic Benefit Cost, before Tax	(200,000)	(200,000)
RegulatoryAssetDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	(108,600,000)	50,200,000
RegulatoryAssetReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax	(34,900,000)	(18,100,000)
RegulatoryAssetAmortizationOfDefinedBenefitPlanNetPriorServiceCostCreditRecognizedInNetPeriodicBenefitCostBeforeTax	1,400,000	300,000
RegulatoryAssetReclassificationOfDefinedBenefitPlanNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostBeforeTax	11,900,000	(11,300,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
ension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	9,200,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax		12,100,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Transition Assets (Obligations), before Tax		200,000
DefinedBenefitPlanRegulatoryAssetIncomeNetGainsLossesBeforeTax	376,100,000	196,300,000
DefinedBenefitPlanRegulatoryAssetNetPriorServiceCostCreditBeforeTax	(6,700,000)	(2,400,000)
DefinedBenefitPlanRegulatoryAssetNetTransitionAssetsObligationsBeforeTax		11,400,000
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Defined Benefit Plan, Amortization of Net Gains (Losses)	1,000,000
RegulatoryAssetDefinedBenefitPlanAmortizationOfNetGainsLosses	31,400,000
RegulatoryAssetDefinedBenefitPlanAmortizationOfNetPriorServiceCostCredit	(2,100,000)
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	63,500,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	65,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	66,800,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	68,200,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	69,600,000
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	366,300,000
DescriptionOfDefinedContributionPensionAndOtherPostretirementPlans	For the PBOP Plans, it is NU’s policy to annually fund the NUSCO PBOP Plans in an amount equal to the PBOP Plans' postretirement benefit cost, excluding curtailment and termination benefits. NU contributed $50 million to the NUSCO PBOP Plans in 2012 and expects to make $25.7 million in contributions in 2013. NU contributes an amount that approximates annual benefit payments to the NSTAR PBOP Plan. NU contributed $22.7 million to the NSTAR PBOP Plan for the period April 10, 2012 to December 31, 2012 and expects to make $30 million in contributions in 2013.
Other Postretirement Benefit Plans Defined Benefit Member \| Fair Value Inputs Level 1 Member
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	201,700,000	157,000,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	201,700,000	157,000,000
Other Postretirement Benefit Plans Defined Benefit Member \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	243,800,000	49,000,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	243,800,000	49,000,000
Other Postretirement Benefit Plans Defined Benefit Member \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Beginning Balance	60,400,000	50,200,000
Fair Value of Plan Assets Ending Balance	146,000,000	60,400,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	60,400,000	50,200,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	16,600,000	1,000,000
Defined Benefit Plan, Purchases, Sales, and Settlements	9,500,000	9,200,000
Fair Value of Plan Assets Ending Balance	146,000,000	60,400,000
Level3PlanAssetsAssumedinMerger	59,500,000
Other Postretirement Benefit Plans Defined Benefit Member \| United States Equity Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	210,300,000	127,600,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	210,300,000	127,600,000
Other Postretirement Benefit Plans Defined Benefit Member \| United States Equity Securities [Member] \| Fair Value Inputs Level 1 Member
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	116,300,000	116,900,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	116,300,000	116,900,000
Other Postretirement Benefit Plans Defined Benefit Member \| United States Equity Securities [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	57,700,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	57,700,000
Other Postretirement Benefit Plans Defined Benefit Member \| United States Equity Securities [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Beginning Balance	10,700,000	10,100,000
Fair Value of Plan Assets Ending Balance	36,300,000	10,700,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	10,700,000	10,100,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	5,900,000	600,000
Defined Benefit Plan, Purchases, Sales, and Settlements	0	0
Fair Value of Plan Assets Ending Balance	36,300,000	10,700,000
Level3PlanAssetsAssumedinMerger	19,700,000
Other Postretirement Benefit Plans Defined Benefit Member \| International Equity Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	97,700,000	29,600,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	97,700,000	29,600,000
Other Postretirement Benefit Plans Defined Benefit Member \| International Equity Securities [Member] \| Fair Value Inputs Level 1 Member
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	68,000,000	29,600,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	68,000,000	29,600,000
Other Postretirement Benefit Plans Defined Benefit Member \| International Equity Securities [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	29,700,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	29,700,000
Other Postretirement Benefit Plans Defined Benefit Member \| Emergining Markets Equity Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	21,700,000	4,600,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	21,700,000	4,600,000
Other Postretirement Benefit Plans Defined Benefit Member \| Emergining Markets Equity Securities [Member] \| Fair Value Inputs Level 1 Member
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	7,700,000	4,600,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	7,700,000	4,600,000
Other Postretirement Benefit Plans Defined Benefit Member \| Emergining Markets Equity Securities [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	14,000,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	14,000,000
Other Postretirement Benefit Plans Defined Benefit Member \| Private Equity Funds [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	11,300,000	5,100,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	11,300,000	5,100,000
Other Postretirement Benefit Plans Defined Benefit Member \| Private Equity Funds [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Beginning Balance	5,100,000	(300,000)
Fair Value of Plan Assets Ending Balance	11,300,000	5,100,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	5,100,000	(300,000)
Defined Benefit Plan, Actual Return on Plan Assets Still Held	1,600,000	(600,000)
Defined Benefit Plan, Purchases, Sales, and Settlements	4,600,000	4,200,000
Fair Value of Plan Assets Ending Balance	11,300,000	5,100,000
Other Postretirement Benefit Plans Defined Benefit Member \| Fixed Income Debt Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	169,800,000	70,300,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	169,800,000	70,300,000
Other Postretirement Benefit Plans Defined Benefit Member \| Fixed Income Debt Securities [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	137,700,000	44,300,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	137,700,000	44,300,000
Other Postretirement Benefit Plans Defined Benefit Member \| Fixed Income Debt Securities [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Beginning Balance	26,000,000	23,400,000
Fair Value of Plan Assets Ending Balance	32,100,000	26,000,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	26,000,000	23,400,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	4,000,000	200,000
Defined Benefit Plan, Purchases, Sales, and Settlements	2,100,000	2,400,000
Fair Value of Plan Assets Ending Balance	32,100,000	26,000,000
Other Postretirement Benefit Plans Defined Benefit Member \| Hedge Funds [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	39,600,000	16,100,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	39,600,000	16,100,000
Other Postretirement Benefit Plans Defined Benefit Member \| Hedge Funds [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Beginning Balance	16,100,000	16,400,000
Fair Value of Plan Assets Ending Balance	39,600,000	16,100,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	16,100,000	16,400,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	2,100,000	(300,000)
Fair Value of Plan Assets Ending Balance	39,600,000	16,100,000
Level3PlanAssetsAssumedinMerger	21,400,000
Other Postretirement Benefit Plans Defined Benefit Member \| Real Estate [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	31,400,000	7,200,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	31,400,000	7,200,000
Other Postretirement Benefit Plans Defined Benefit Member \| Real Estate [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	4,700,000	4,700,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	4,700,000	4,700,000
Other Postretirement Benefit Plans Defined Benefit Member \| Real Estate [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Beginning Balance	2,500,000
Fair Value of Plan Assets Ending Balance	26,700,000	2,500,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	2,500,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	3,000,000	(100,000)
Defined Benefit Plan, Purchases, Sales, and Settlements	2,800,000	2,600,000
Fair Value of Plan Assets Ending Balance	26,700,000	2,500,000
Level3PlanAssetsAssumedinMerger	18,400,000
Other Postretirement Benefit Plans Defined Benefit Member \| Cash And Cash Equivalents Member
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	9,700,000	5,900,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	9,700,000	5,900,000
Other Postretirement Benefit Plans Defined Benefit Member \| Cash And Cash Equivalents Member \| Fair Value Inputs Level 1 Member
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	9,700,000	5,900,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	9,700,000	5,900,000
Other Postretirement Benefit Plans Defined Benefit Member \| Assetsrelatedto401h [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	117,600,000	19,000,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	117,600,000	19,000,000
NUSCO Pension Plan [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.24%	5.03%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	3.50%	3.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	5.03%	5.57%	5.98%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.50%	3.50%	4.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	8.25%	8.25%	8.75%
Nstar pbop Plans [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.35%
Health Care Trend Assumption Used In Funded Status	7.10%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.58%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	7.30%
Nstar pbop Plans [Member] \| United States Equity Securities [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Assumed Rate of Return on Defined Benefit Plan Assets	8.30%
Target Allocation	25.00%
Nstar pbop Plans [Member] \| International Equity Securities [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Assumed Rate of Return on Defined Benefit Plan Assets	8.60%
Target Allocation	20.00%
Nstar pbop Plans [Member] \| Emergining Markets Equity Securities [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Assumed Rate of Return on Defined Benefit Plan Assets	8.80%
Target Allocation	5.00%
Nstar pbop Plans [Member] \| Fixed Income Debt Securities [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Assumed Rate of Return on Defined Benefit Plan Assets	4.60%
Target Allocation	30.00%
Nstar pbop Plans [Member] \| Hedge Funds [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Assumed Rate of Return on Defined Benefit Plan Assets	8.40%
Target Allocation	10.00%
Nstar pbop Plans [Member] \| Real Estate [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Assumed Rate of Return on Defined Benefit Plan Assets	7.90%
Target Allocation	10.00%
NUSCO PBOP Plan [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.04%	4.84%
Health Care Trend Assumption Used In Funded Status	7.00%	7.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.84%	5.28%	5.73%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	8.25%	8.25%	8.75%

Amount reprsents the portion of of pension expense that is capitalized.

No definition available.

Name:	nu_AmountCapitalizedPensionExpense
Namespace Prefix:	nu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the assumed rate of return for each class of pension and other post retirement benefit plan assets

+ References

No definition available.

+ Details

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Namespace Prefix:	nu_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of benefit plan payments made in a lump sum to participants.

+ References

No definition available.

+ Details

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Namespace Prefix:	nu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Defined Benefit Plan payments related to the NU SERP plan

+ References

No definition available.

+ Details

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Namespace Prefix:	nu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	nu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

+ References

No definition available.

+ Details

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Namespace Prefix:	nu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Of the original amount of transition assets as of the date FAS 87 or 106 was initially applied, (a) the fair value of plan assets plus any recognized accrued pension or other postretirement benefit cost or less any recognized prepaid pension or other postretirement benefit cost in excess of (b) the benefit obligation, the portion of which has yet to be recognized as components of net periodic benefit cost. Of the original amount of transition obligations as of the date FAS 87 or 106 was initially applied, (a) the benefit obligation in excess of (b) the fair value of plan assets plus any recognized accrued pension or other postretirement benefit cost or less any recognized prepaid pension or other postretirement benefit cost, the portion of which has yet to be recognized as components of net periodic benefit cost. This amount is pretax.

+ References

No definition available.

+ Details

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Namespace Prefix:	nu_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

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Namespace Prefix:	nu_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

Name:	nu_HealthCareTrendAssumptionUsedInFundedStatus
Namespace Prefix:	nu_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of plan assets assumed in merger with NSTAR

+ References

No definition available.

+ Details

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Namespace Prefix:	nu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The change in other comprehensive income due to the amortization of the net prior service costs (credit) into net periodic pension costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	nu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amounts in regulatory asset related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

+ References

No definition available.

+ Details

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Namespace Prefix:	nu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amounts in regulatory asset related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

+ References

No definition available.

+ Details

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Namespace Prefix:	nu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Pretax change in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan, that has not been recognized in net periodic benefit cost.

+ References

No definition available.

+ Details

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Namespace Prefix:	nu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The net transition asset or obligation recognized, before tax, as a reclassification adjustment of other comprehensive income as a result of being recognized as a component of net periodic benefit cost for the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	nu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

he net gain (loss) previously recognized in other comprehensive income that is a reclassification adjustment of other comprehensive income as a result of being recognized as a component of net periodic benefit cost for the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	nu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount represents allocation of pension and other post retirement benefits expense from parent and other that are not included in pension and post-retirement benefit expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	nu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Target asset allocation for defined benefit plans

+ References

No definition available.

+ Details

Name:	nu_TargetAllocation
Namespace Prefix:	nu_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503844

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Balance Type:	na
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- Definition

+ References

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- Definition

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 60

-Glossary Prior Service Cost

-URI http://asc.fasb.org/extlink&oid=6521920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph i

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 87

-Paragraph 264

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 158

-Paragraph 7

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Prior Service Cost

-URI http://asc.fasb.org/extlink&oid=6521884

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 106

-Paragraph 518

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

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- Definition

Before tax amount of net transition assets (obligations) which has yet to be recognized as a component of net periodic benefit cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (k)

-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph i

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 106

-Paragraph 518

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 7

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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The amount of increase in the benefit obligation attributed to business combinations.

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Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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The amount of cash or cash equivalents contributed by the entity to fund its pension plans.

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