PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSIONS (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan Benefits Paid Lump Sum	$ 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan Benefits Paid Lump Sum	0
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Accrued Pension, PBOP and SERP	1,326,037,000	1,050,614,000
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
Pension Contribution	191,101,000	90,633,000	37,160,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year, Description	A contribution of $143.6 million ($112.6 million of which was contributed by PSNH) was made in 2011. Based on the current status of the Pension Plan, NU is required to make a contribution to the Pension Plan of approximately $197.3 million in 2012, which will be made in quarterly installments, to meet minimum current funding requirements under the PPA.
United States Equity Securities [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Assumed Rate of Return on Defined Benefit Plan Assets	9.00%
Target Allocation	24.00%
International Equity Securities [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Assumed Rate of Return on Defined Benefit Plan Assets	9.00%
Target Allocation	13.00%
Emergining Markets Equity Securities [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Assumed Rate of Return on Defined Benefit Plan Assets	10.00%
Target Allocation	3.00%
Private Equity Funds [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Assumed Rate of Return on Defined Benefit Plan Assets	13.00%
Target Allocation	12.00%
Fixed Income Debt Securities [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Assumed Rate of Return on Defined Benefit Plan Assets	5.00%
Target Allocation	20.00%
High Yield Fixed Income Debt Securities [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Assumed Rate of Return on Defined Benefit Plan Assets	7.50%
Target Allocation	3.50%
Emerging Markets Debt Securities [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Assumed Rate of Return on Defined Benefit Plan Assets	7.50%
Target Allocation	3.50%
Hedge Funds [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Assumed Rate of Return on Defined Benefit Plan Assets	7.00%
Target Allocation	13.00%
Real Estate [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Assumed Rate of Return on Defined Benefit Plan Assets	7.50%
Target Allocation	8.00%
Pension Plans Defined Benefit Member
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation Beginning Balance	(2,820,900,000)	(2,610,300,000)
Defined Benefit Plan Service Cost	(55,400,000)	(51,000,000)	(45,800,000)
Defined Benefit Plan Interest Cost	(153,300,000)	(152,600,000)	(155,700,000)
Defined Benefit Plan, Actuarial Net (Gains) Losses	(206,100,000)	(140,600,000)
Defined Benefit Plan, Benefits Paid	134,400,000	130,200,000
Defined Benefit Plan, Payments SERP	2,400,000	2,500,000
Defined Benefit Plan Benefits Paid Lump Sum	0	900,000
Benefit Obligation Ending Balance	(3,098,900,000)	(2,820,900,000)	(2,610,300,000)
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan Service Cost	55,400,000	51,000,000	45,800,000
Defined Benefit Plan Interest Cost	153,300,000	152,600,000	155,700,000
Defined Benefit Plan, Expected Return on Plan Assets	(170,800,000)	(182,600,000)	(189,400,000)
Defined Benefit Plan, Amortization of Gains (Losses)	84,200,000	53,500,000	21,000,000
Defined Benefit Plan Amortization Of Transition Obligations Assets			300,000
Defined Benefit Plan Amortization Of Prior Service Cost Credit	9,700,000	9,900,000	9,900,000
Defined Benefit Plan Net Periodic Benefit Cost	131,800,000	84,400,000	43,300,000
Amount Capitalized Pension Expense	29,700,000	16,900,000	6,200,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Beginning Balance	1,977,600,000	1,789,600,000
Defined Benefit Plan, Actual Return on Plan Assets	19,100,000	274,100,000
Defined Benefit Plan, Contributions by Employer	143,600,000	45,000,000
Defined Benefit Plan, Benefits Paid	(134,400,000)	(130,200,000)
Defined Benefit Plan Benefits Paid Lump Sum	0	(900,000)
Fair Value of Plan Assets Ending Balance	2,005,900,000	1,977,600,000	1,789,600,000
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Defined Benefit Plan, Funded Status of Plan	(1,093,000,000)	(843,300,000)
Defined Benefit Plan, Accumulated Benefit Obligation	2,810,600,000	2,551,100,000
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	5.03%	5.57%
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	5.57%	5.98%	6.89%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.50%	4.00%	4.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	8.25%	8.75%	8.75%
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	1,977,600,000	1,789,600,000
Fair Value of Plan Assets Ending Balance	2,005,900,000	1,977,600,000	1,789,600,000
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	23,000,000	3,700,000
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax	(4,800,000)	(2,700,000)
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax	(300,000)	(300,000)
RegulatoryAssetDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	334,800,000	45,300,000
RegulatoryAssetReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax	(79,400,000)	(51,000,000)
RegulatoryAssetAmortizationOfDefinedBenefitPlanNetPriorServiceCostCreditRecognizedInNetPeriodicBenefitCostBeforeTax	(9,400,000)	(9,500,000)
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	70,200,000	51,900,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	(1,400,000)	1,700,000
DefinedBenefitPlanRegulatoryAssetIncomeNetGainsLossesBeforeTax	1,126,100,000	871,200,000
DefinedBenefitPlanRegulatoryAssetNetPriorServiceCostCreditBeforeTax	29,300,000	38,800,000
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)	7,000,000
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)	300,000
RegulatoryAssetDefinedBenefitPlanAmortizationOfNetGainsLosses	113,400,000
RegulatoryAssetDefinedBenefitPlanAmortizationOfNetPriorServiceCostCredit	8,100,000
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
Defined Benefit Plan, Expected Future Benefit Payments in Year One	145,400,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	152,800,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	159,500,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	166,300,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	173,700,000
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	983,900,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year, Description	NU’s policy is to annually fund the Pension Plan in an amount at least equal to an amount that will satisfy the requirements of ERISA, as amended by the PPA of 2006, and the Internal Revenue Code. A contribution of $143.6 million ($112.6 million of which was contributed by PSNH) was made in 2011. Based on the current status of the Pension Plan, NU is required to make a contribution to the Pension Plan of approximately $197.3 million in 2012, which will be made in quarterly installments, to meet minimum current 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	292,600,000	277,200,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	292,600,000	277,200,000
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	629,800,000	666,500,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	629,800,000	666,500,000
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	1,033,900,000	889,600,000
Fair Value of Plan Assets Ending Balance	1,102,500,000	1,033,900,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	1,033,900,000	889,600,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	6,400,000	62,200,000
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	17,000,000	500,000
Defined Benefit Plan, Purchases, Sales, and Settlements	45,200,000	81,600,000
Fair Value of Plan Assets Ending Balance	1,102,500,000	1,033,900,000
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	492,900,000	569,200,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	492,900,000	569,200,000
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	218,700,000	256,300,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	218,700,000	256,300,000
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	14,800,000	46,900,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	14,800,000	46,900,000
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	266,000,000	252,100,000
Fair Value of Plan Assets Ending Balance	259,400,000	266,000,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	266,000,000	252,100,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	(6,600,000)	13,900,000
Fair Value of Plan Assets Ending Balance	259,400,000	266,000,000
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	241,900,000	257,300,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	241,900,000	257,300,000
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	20,000,000	6,400,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	20,000,000	6,400,000
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	221,900,000	250,900,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	221,900,000	250,900,000
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	66,600,000	81,100,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	66,600,000	81,100,000
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	66,600,000	81,100,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	66,600,000	81,100,000
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	266,400,000	236,400,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	266,400,000	236,400,000
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	11,300,000	6,900,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	11,300,000	6,900,000
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	229,500,000	193,800,000
Fair Value of Plan Assets Ending Balance	255,100,000	229,500,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	229,500,000	193,800,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	20,000,000	10,900,000
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	19,500,000
Defined Benefit Plan, Purchases, Sales, and Settlements	(13,900,000)	24,800,000
Fair Value of Plan Assets Ending Balance	255,100,000	229,500,000
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	562,700,000	516,800,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	562,700,000	516,800,000
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	17,800,000	7,600,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	17,800,000	7,600,000
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	268,700,000	261,600,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	268,700,000	261,600,000
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	247,600,000	174,000,000
Fair Value of Plan Assets Ending Balance	276,200,000	247,600,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	247,600,000	174,000,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	(1,500,000)	21,000,000
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	(2,800,000)
Defined Benefit Plan, Purchases, Sales, and Settlements	32,900,000	52,600,000
Fair Value of Plan Assets Ending Balance	276,200,000	247,600,000
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	240,000,000	247,100,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	240,000,000	247,100,000
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	247,100,000	231,200,000
Fair Value of Plan Assets Ending Balance	240,000,000	247,100,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	247,100,000	231,200,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	(7,100,000)	15,900,000
Fair Value of Plan Assets Ending Balance	240,000,000	247,100,000
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	154,400,000	69,700,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	154,400,000	69,700,000
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	24,800,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	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	57,800,000	26,000,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	57,800,000	26,000,000
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	43,700,000	38,500,000
Fair Value of Plan Assets Ending Balance	71,800,000	43,700,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	43,700,000	38,500,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	1,600,000	500,000
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	300,000	500,000
Defined Benefit Plan, Purchases, Sales, and Settlements	26,200,000	4,200,000
Fair Value of Plan Assets Ending Balance	71,800,000	43,700,000
Other Postretirement Benefit Plans Defined Benefit Member
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation Beginning Balance	(489,900,000)	(475,700,000)
Defined Benefit Plan Service Cost	(9,200,000)	(8,500,000)	(7,200,000)
Defined Benefit Plan Interest Cost	(25,700,000)	(26,800,000)	(29,100,000)
Defined Benefit Plan, Actuarial Net (Gains) Losses	(30,100,000)	(17,500,000)
Defined Benefit Plan, Benefits Paid	38,100,000	42,300,000
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received	(4,100,000)	(3,700,000)
Benefit Obligation Ending Balance	(520,900,000)	(489,900,000)	(475,700,000)
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan Service Cost	9,200,000	8,500,000	7,200,000
Defined Benefit Plan Interest Cost	25,700,000	26,800,000	29,100,000
Defined Benefit Plan, Expected Return on Plan Assets	(21,600,000)	(21,700,000)	(20,900,000)
Defined Benefit Plan, Amortization of Gains (Losses)	19,000,000	16,700,000	10,500,000
Defined Benefit Plan Amortization Of Transition Obligations Assets	11,600,000	11,600,000	11,600,000
Defined Benefit Plan Amortization Of Prior Service Cost Credit	(300,000)	(300,000)	(300,000)
Defined Benefit Plan Net Periodic Benefit Cost	43,600,000	41,600,000	37,200,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Beginning Balance	278,500,000	240,300,000
Defined Benefit Plan, Actual Return on Plan Assets	(2,500,000)	34,900,000
Defined Benefit Plan, Contributions by Employer	47,500,000	45,600,000
Defined Benefit Plan, Benefits Paid	(38,100,000)	(42,300,000)
Fair Value of Plan Assets Ending Balance	285,400,000	278,500,000	240,300,000
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Defined Benefit Plan, Funded Status of Plan	(235,500,000)	(211,400,000)
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		5.28%
Defined Benefit Plan, Description of Direction and Pattern of Change for Assumed Health Care Cost Trend Rate	For 2011 through 2013, 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.
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	5.28%	5.73%	6.90%
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	16,200,000
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation	(13,500,000)
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components	1,200,000
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components	(1,000,000)
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	278,500,000	240,300,000
Fair Value of Plan Assets Ending Balance	285,400,000	278,500,000	240,300,000
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	4,000,000	700,000
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax	(900,000)	(800,000)
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	50,200,000	4,200,000
RegulatoryAssetReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax	(18,100,000)	(15,900,000)
RegulatoryAssetAmortizationOfDefinedBenefitPlanNetPriorServiceCostCreditRecognizedInNetPeriodicBenefitCostBeforeTax	300,000	300,000
RegulatoryAssetReclassificationOfDefinedBenefitPlanNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostBeforeTax	(11,300,000)	(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	12,100,000	9,000,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	0	0
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Transition Assets (Obligations), before Tax	200,000	500,000
DefinedBenefitPlanRegulatoryAssetIncomeNetGainsLossesBeforeTax	196,300,000	164,200,000
DefinedBenefitPlanRegulatoryAssetNetPriorServiceCostCreditBeforeTax	(2,400,000)	(2,700,000)
DefinedBenefitPlanRegulatoryAssetNetTransitionAssetsObligationsBeforeTax	11,400,000	22,700,000
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)	1,200,000
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)	0
Defined Benefit Plan, Amortization of Net Transition Asset (Obligation)	200,000
RegulatoryAssetDefinedBenefitPlanAmortizationOfNetGainsLosses	20,600,000
RegulatoryAssetDefinedBenefitPlanAmortizationOfNetPriorServiceCostCredit	(300,000)
RegulatoryAssetDefinedBenefitPlanAmortizationOfNetTransitionAssetObligation	11,300,000
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
Defined Benefit Plan, Expected Future Benefit Payments in Year One	41,400,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	42,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	42,400,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	42,700,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	42,900,000
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	215,700,000
Prescription Drug Subsidy Receipts, Year One	(4,700,000)
Prescription Drug Subsidy Receipts, Year Two	(5,000,000)
Prescription Drug Subsidy Receipts, Year Three	(5,400,000)
Prescription Drug Subsidy Receipts, Year Four	(5,700,000)
Prescription Drug Subsidy Receipts, Five Fiscal Years Thereafter	(34,900,000)
Prescription Drug Subsidy Receipts, Year Five	(6,000,000)
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year, Description	NU contributed $43.8 million to the PBOP plan in 2011 and expects to make $44.7 million in contributions to the PBOP plan in 2012. NU also makes an additional contribution to the PBOP plan for the amounts received from the federal Medicare subsidy. This amount was $3.7 million in 2011 and is expected to be $4.7 million in 2012.
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	157,000,000	179,000,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	157,000,000	179,000,000
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	49,000,000	49,300,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	49,000,000	49,300,000
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	50,200,000	24,600,000
Fair Value of Plan Assets Ending Balance	60,400,000	50,200,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	50,200,000	24,600,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	1,000,000	4,100,000
Defined Benefit Plan, Purchases, Sales, and Settlements	9,200,000	21,500,000
Fair Value of Plan Assets Ending Balance	60,400,000	50,200,000
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	127,600,000	142,200,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	127,600,000	142,200,000
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	116,900,000	132,100,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	116,900,000	132,100,000
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	10,100,000	0
Fair Value of Plan Assets Ending Balance	10,700,000	10,100,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	10,100,000	0
Defined Benefit Plan, Actual Return on Plan Assets Still Held	600,000	500,000
Defined Benefit Plan, Purchases, Sales, and Settlements	0	9,600,000
Fair Value of Plan Assets Ending Balance	10,700,000	10,100,000
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	29,600,000	34,800,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	29,600,000	34,800,000
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	29,600,000	34,800,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	29,600,000	34,800,000
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	4,600,000	7,700,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	4,600,000	7,700,000
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	4,600,000	7,700,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	4,600,000	7,700,000
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	5,100,000	300,000	0
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	5,100,000	300,000	0
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	300,000
Fair Value of Plan Assets Ending Balance	5,100,000	300,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	300,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	600,000
Defined Benefit Plan, Purchases, Sales, and Settlements	4,200,000	300,000
Fair Value of Plan Assets Ending Balance	5,100,000	300,000
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	60,900,000	58,700,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	60,900,000	58,700,000
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	34,900,000	35,300,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	34,900,000	35,300,000
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	23,400,000	24,600,000
Fair Value of Plan Assets Ending Balance	26,000,000	23,400,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	23,400,000	24,600,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	200,000	3,200,000
Defined Benefit Plan, Purchases, Sales, and Settlements	2,400,000	(4,400,000)
Fair Value of Plan Assets Ending Balance	26,000,000	23,400,000
Other Postretirement Benefit Plans Defined Benefit Member \| High Yield Fixed Income Debt Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	4,500,000	4,400,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	4,500,000	4,400,000
Other Postretirement Benefit Plans Defined Benefit Member \| High Yield 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	4,500,000	4,400,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	4,500,000	4,400,000
Other Postretirement Benefit Plans Defined Benefit Member \| Emerging Markets Debt Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets Ending Balance	4,900,000	4,800,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	4,900,000	4,800,000
Other Postretirement Benefit Plans Defined Benefit Member \| Emerging Markets 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	4,900,000	4,800,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	4,900,000	4,800,000
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	16,100,000	16,400,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	16,100,000	16,400,000
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	16,400,000
Fair Value of Plan Assets Ending Balance	16,100,000	16,400,000
Level 3 Rollforwards
Fair Value of Plan Assets Beginning Balance	16,400,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	(300,000)	400,000
Defined Benefit Plan, Purchases, Sales, and Settlements		16,000,000
Fair Value of Plan Assets Ending Balance	16,100,000	16,400,000
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	7,200,000	4,800,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	7,200,000	4,800,000
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	4,800,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	4,700,000	4,800,000
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 Ending Balance	2,500,000
Level 3 Rollforwards
Defined Benefit Plan, Actual Return on Plan Assets Still Held	(100,000)
Defined Benefit Plan, Purchases, Sales, and Settlements	2,600,000
Fair Value of Plan Assets Ending Balance	2,500,000
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	5,900,000	4,400,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	5,900,000	4,400,000
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	5,900,000	4,400,000
Level 3 Rollforwards
Fair Value of Plan Assets Ending Balance	5,900,000	4,400,000
Other Post Retirement Benefit Member Taxable Asset [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	6.45%	6.85%	6.85%
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Assumed Rate of Return on Defined Benefit Plan Assets		6.45%
Other Post Retirement Benefit Member Taxable Asset [Member] \| United States Equity Securities [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Assumed Rate of Return on Defined Benefit Plan Assets		9.00%
Target Allocation		55.00%
Other Post Retirement Benefit Member Taxable Asset [Member] \| International Equity Securities [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Assumed Rate of Return on Defined Benefit Plan Assets		9.00%

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

No definition available.

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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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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
Balance Type:	debit
Period Type:	instant

- 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

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

Name:	nu_Regulatoryassetamortizationofdefinedbenefitplannetpriorservicecostcreditrecognizedinnetperiodicbenefitcostbeforetax
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_
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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
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Period Type:	instant

- Definition

+ 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_
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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_
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Balance Type:	debit
Period Type:	duration

- Definition

Target asset allocation for defined benefit plans

+ References

No definition available.

+ Details

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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

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- Definition

+ References

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- Definition

+ References

Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6962843&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 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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Prior Service Cost

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

-Topic 715

-SubTopic 60

Reference 5: 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 6: 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.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Glossary Prior Service Cost

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

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-SubTopic 30

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- Definition

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph ii

-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 Accounting Standards Codification

-Topic 715

-SubTopic 20

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-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph i

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

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-Name Accounting Standards Codification

-Glossary Transition Asset

-URI http://asc.fasb.org/extlink&oid=6749452

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-Name Statement of Financial Accounting Standard (FAS)

-Number 158

-Paragraph 7

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 106

-Paragraph 518

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-Name Accounting Standards Codification

-Glossary Transition Obligation

-URI http://asc.fasb.org/extlink&oid=6749492

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- Definition

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost)

-URI http://asc.fasb.org/extlink&oid=6504226

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-Name Accounting Standards Codification

-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

-URI http://asc.fasb.org/extlink&oid=6504192

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

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-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph b

-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 Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 106

-Paragraph 518

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

-Number 87

-Paragraph 264

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

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The interest rate used to adjust for the time value of money for the plan.

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Expected rate of compensation increases (for pay-related plans).

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Descriptive information regarding the employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. Description may include a range of expected contributions, required minimum contribution, whether the expected contribution is discretionary, and further explanation.

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The amount of the aggregate benefits expected to be paid in the five fiscal years thereafter (the aggregate amount of benefits expected to be paid in years 6 through 10 after the date of the latest statement of financial position).

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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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 funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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Amount of the period's gross receipts received from the prescription drug subsidy, which is to be used in the roll forward of the accumulated postretirement benefit obligation of an applicable postretirement benefit plan.

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Purchases, sales, and settlements of plan assets that occurred during the period.

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