CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current Assets:
Cash	$ 38,703us-gaap_Cash	$ 43,364us-gaap_Cash
Receivables, Net	856,346us-gaap_AccountsReceivableNetCurrent	765,391us-gaap_AccountsReceivableNetCurrent
Unbilled Revenues	211,758	224,982
Taxes Receivable	337,307us-gaap_IncomeTaxesReceivable	16,629us-gaap_IncomeTaxesReceivable
Fuel, Materials and Supplies	349,664us-gaap_EnergyRelatedInventory	303,233us-gaap_EnergyRelatedInventory
Regulatory Assets Current	672,493us-gaap_RegulatoryAssetsCurrent	535,791us-gaap_RegulatoryAssetsCurrent
Prepayments and Other Current Assets	226,194us-gaap_OtherAssetsCurrent	197,659us-gaap_OtherAssetsCurrent
Total Current Assets	2,692,465us-gaap_AssetsCurrent	2,087,049us-gaap_AssetsCurrent
Property, Plant and Equipment, Net	18,647,041	17,576,186
Deferred Debits and Other Assets:
Regulatory Assets Long Term	4,054,086us-gaap_RegulatoryAssetsNoncurrent	3,758,694us-gaap_RegulatoryAssetsNoncurrent
Goodwill	3,519,401us-gaap_Goodwill	3,519,401us-gaap_Goodwill
Marketable Securities	515,025us-gaap_MarketableSecuritiesNoncurrent	488,515us-gaap_MarketableSecuritiesNoncurrent
Other Long-Term Assets	349,957us-gaap_OtherAssetsNoncurrent	365,692us-gaap_OtherAssetsNoncurrent
Total Deferred Debits and Other Assets	8,438,469us-gaap_AssetsNoncurrent	8,132,302us-gaap_AssetsNoncurrent
Total Assets	29,777,975us-gaap_Assets	27,795,537us-gaap_Assets
Current Liabilities:
Notes Payable	956,825us-gaap_NotesPayable	1,093,000us-gaap_NotesPayable
Long-Term Debt - Current Portion	245,583us-gaap_LongTermDebtCurrent	533,346us-gaap_LongTermDebtCurrent
Accounts Payable - Current	868,231us-gaap_AccountsPayableCurrent	742,251us-gaap_AccountsPayableCurrent
Regulatory Liability Current	235,022us-gaap_RegulatoryLiabilityCurrent	204,278us-gaap_RegulatoryLiabilityCurrent
Other Liabilities - Current	828,720us-gaap_OtherLiabilitiesCurrent	702,776us-gaap_OtherLiabilitiesCurrent
Total Current Liabilities	3,134,381us-gaap_LiabilitiesCurrent	3,275,651us-gaap_LiabilitiesCurrent
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	4,467,473	4,029,026
Regulatory Liabilities Long-Term	515,144us-gaap_RegulatoryLiabilityNoncurrent	502,984us-gaap_RegulatoryLiabilityNoncurrent
Long-Term Derivative Liabilities	409,632us-gaap_DerivativeLiabilitiesNoncurrent	624,050us-gaap_DerivativeLiabilitiesNoncurrent
Accrued Pension, PBOP and SERP	1,638,558	896,844
Other Long-Term Liabilities	874,387us-gaap_OtherLiabilitiesNoncurrent	923,053us-gaap_OtherLiabilitiesNoncurrent
Total Deferred Credits and Other Liabilities	7,905,194us-gaap_LiabilitiesNoncurrent	6,975,957us-gaap_LiabilitiesNoncurrent
Capitalization:
Long-Term Debt	8,606,017us-gaap_LongTermDebtNoncurrent	7,776,833us-gaap_LongTermDebtNoncurrent
Noncontrolling Interest in Consolidated Subsidiary:
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	155,568	155,568
Common Shareholders' Equity:
Common Stock	1,666,796us-gaap_CommonStockValue	1,665,351us-gaap_CommonStockValue
Capital Surplus, Paid In	6,235,834us-gaap_AdditionalPaidInCapital	6,192,765us-gaap_AdditionalPaidInCapital
Retained Earnings	2,448,661	2,125,980
Accumulated Other Comprehensive Loss	(74,009)	(46,031)
Treasury Stock	(300,467)us-gaap_TreasuryStockValue	(326,537)us-gaap_TreasuryStockValue
Common Shareholders' Equity	9,976,815us-gaap_StockholdersEquity	9,611,528us-gaap_StockholdersEquity
Total Capitalization	18,738,400	17,543,929
Total Liabilities and Capitalization	29,777,975	27,795,537
The Connecticut Light And Power Company [Member]
Current Assets:
Cash	2,356	7,237
Receivables, Net	355,140	319,670
Accounts Receivable from Affiliated Companies	16,757	13,777
Unbilled Revenues	102,137	92,401
Taxes Receivable	116,148	20,041
Regulatory Assets Current	220,344	150,943
Materials and Supplies	46,664	54,606
Prepayments and Other Current Assets	37,822	33,041
Total Current Assets	897,368	691,716
Property, Plant and Equipment, Net	6,809,664	6,451,259
Deferred Debits and Other Assets:
Regulatory Assets Long Term	1,475,508	1,663,147
Other Long-Term Assets	177,568	174,380
Total Deferred Debits and Other Assets	1,653,076	1,837,527
Total Assets	9,360,108	8,980,502
Current Liabilities:
Notes Payable To Affiliated Companies	133,400	287,300
Long-Term Debt - Current Portion	162,000	150,000
Accounts Payable - Current	272,971	201,047
Accounts Payable to Affiliated Companies	65,594	56,531
Obligations to Third Party Suppliers	73,624	73,914
Regulatory Liability Current	124,722	93,961
Derivative Liabilities - Current	88,459	92,233
Other Liabilities - Current	153,420	134,716
Total Current Liabilities	1,074,190	1,089,702
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,642,805	1,510,586
Regulatory Liabilities Long-Term	81,298	93,757
Long-Term Derivative Liabilities	406,199	617,072
Accrued Pension, PBOP and SERP	273,854	95,895
Other Long-Term Liabilities	148,844	163,588
Total Deferred Credits and Other Liabilities	2,553,000	2,480,898
Capitalization:
Long-Term Debt	2,679,951	2,591,208
Noncontrolling Interest in Consolidated Subsidiary:
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	116,200	116,200
Common Shareholders' Equity:
Common Stock	60,352	60,352
Capital Surplus, Paid In	1,804,869	1,682,047
Retained Earnings	1,072,477	961,482
Accumulated Other Comprehensive Loss	(931)	(1,387)
Common Shareholders' Equity	2,936,767	2,702,494
Total Capitalization	5,732,918	5,409,902
Total Liabilities and Capitalization	9,360,108	8,980,502
NSTAR Electric Company [Member]
Current Assets:
Cash	12,773	8,021
Receivables, Net	234,481	209,711
Accounts Receivable from Affiliated Companies	40,353	27,264
Unbilled Revenues	29,741	41,368
Taxes Receivable	144,601	25,590
Regulatory Assets Current	198,710	204,144
Materials and Supplies	74,179	44,236
Prepayments and Other Current Assets	10,815	11,120
Total Current Assets	745,653	571,454
Property, Plant and Equipment, Net	5,335,436	5,043,887
Deferred Debits and Other Assets:
Regulatory Assets Long Term	1,179,100	1,235,156
Other Long-Term Assets	73,051	60,624
Total Deferred Debits and Other Assets	1,252,151	1,295,780
Total Assets	7,333,240	6,911,121
Current Liabilities:
Notes Payable	302,000	103,500
Long-Term Debt - Current Portion	4,700	301,650
Accounts Payable - Current	217,311	202,100
Accounts Payable to Affiliated Companies	63,517	75,707
Deferred Tax Liabilities Current	55,136	50,128
Regulatory Liability Current	49,611	53,958
Other Liabilities - Current	186,513	123,869
Total Current Liabilities	878,788	910,912
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,527,667	1,466,835
Regulatory Liabilities Long-Term	262,738	253,108
Accrued Pension, PBOP and SERP	235,529	118,010
Other Long-Term Liabilities	129,279	206,386
Total Deferred Credits and Other Liabilities	2,155,213	2,044,339
Capitalization:
Long-Term Debt	1,792,712	1,499,417
Noncontrolling Interest in Consolidated Subsidiary:
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	43,000	43,000
Common Shareholders' Equity:
Common Stock	0	0
Capital Surplus, Paid In	994,130	992,625
Retained Earnings	1,468,955	1,420,828
Accumulated Other Comprehensive Loss	442
Common Shareholders' Equity	2,463,527	2,413,453
Total Capitalization	4,299,239	3,955,870
Total Liabilities and Capitalization	7,333,240	6,911,121
Public Service Company Of New Hampshire [Member]
Current Assets:
Cash	489	130
Receivables, Net	80,151	76,331
Accounts Receivable from Affiliated Companies	3,194	90
Unbilled Revenues	40,181	38,344
Fuel, Materials and Supplies	148,139	128,736
Regulatory Assets Current	111,705	92,194
Prepayments and Other Current Assets	42,392	24,100
Total Current Assets	426,251	359,925
Property, Plant and Equipment, Net	2,635,844	2,467,556
Deferred Debits and Other Assets:
Regulatory Assets Long Term	293,115	219,346
Other Long-Term Assets	39,228	39,891
Total Deferred Debits and Other Assets	332,343	259,237
Total Assets	3,394,438	3,086,718
Current Liabilities:
Notes Payable To Affiliated Companies	90,500	86,500
Long-Term Debt - Current Portion	0	50,000
Accounts Payable - Current	93,349	82,920
Accounts Payable to Affiliated Companies	33,734	22,040
Deferred Tax Liabilities Current	36,164	28,596
Regulatory Liability Current	16,044	20,643
Other Liabilities - Current	38,969	51,729
Total Current Liabilities	308,760	342,428
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	587,292	500,166
Regulatory Liabilities Long-Term	51,372	51,723
Accrued Pension, PBOP and SERP	93,243	15,272
Other Long-Term Liabilities	50,155	46,247
Total Deferred Credits and Other Liabilities	782,062	613,408
Capitalization:
Long-Term Debt	1,076,286	999,006
Common Shareholders' Equity:
Common Stock	0	0
Capital Surplus, Paid In	748,240	701,911
Retained Earnings	486,459	438,515
Accumulated Other Comprehensive Loss	(7,369)	(8,550)
Common Shareholders' Equity	1,227,330	1,131,876
Total Capitalization	2,303,616	2,130,882
Total Liabilities and Capitalization	3,394,438	3,086,718
Western Massachusetts Electric Company [Member]
Current Assets:
Receivables, Net	51,066	49,018
Accounts Receivable from Affiliated Companies	7,851	47,607
Unbilled Revenues	15,146	16,562
Taxes Receivable	18,126	432
Regulatory Assets Current	51,923	43,024
Marketable Securities - Current	28,658	26,628
Prepayments and Other Current Assets	7,607	10,479
Total Current Assets	180,377	193,750
Property, Plant and Equipment, Net	1,461,321	1,381,060
Deferred Debits and Other Assets:
Regulatory Assets Long Term	146,307	146,088
Marketable Securities	29,452	31,243
Other Long-Term Assets	22,018	40,679
Total Deferred Debits and Other Assets	197,777	218,010
Total Assets	1,839,475	1,792,820
Current Liabilities:
Notes Payable To Affiliated Companies	21,400	0
Long-Term Debt - Current Portion	50,000	0
Accounts Payable - Current	53,732	62,961
Accounts Payable to Affiliated Companies	14,328	9,230
Accrued Interest	7,526	7,525
Deferred Tax Liabilities Current	18,089	13,098
Regulatory Liability Current	22,486	19,858
Counterparty Deposit	3,376	7,688
Other Liabilities - Current	13,178	20,629
Total Current Liabilities	204,115	140,989
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	416,822	396,933
Regulatory Liabilities Long-Term	10,835	13,873
Accrued Pension, PBOP and SERP	17,705	3,911
Other Long-Term Liabilities	33,747	28,619
Total Deferred Credits and Other Liabilities	479,109	443,336
Capitalization:
Long-Term Debt	578,471	629,389
Common Shareholders' Equity:
Common Stock	10,866	10,866
Capital Surplus, Paid In	391,256	390,743
Retained Earnings	178,834	181,014
Accumulated Other Comprehensive Loss	(3,176)	(3,517)
Common Shareholders' Equity	577,780	579,106
Total Capitalization	1,156,251	1,208,495
Total Liabilities and Capitalization	$ 1,839,475	$ 1,792,820

No authoritative reference available.

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred and payable, which are not elsewhere specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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