XML 202 R167.htm IDEA: XBRL DOCUMENT
v3.22.4

REVENUES - Operating Revenues Disaggregated by Revenue Source (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | $ 12,270,200 | $ 9,815,000 | $ 8,766,500
Alternative Revenue Programs | 5,300 | 41,700 | 130,000
Other Revenues | 13,800 | 6,400 | 7,900
Operating Revenues | 12,289,336 | 9,863,085 | 8,904,430
Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 6,142,700 | 5,123,600 | 4,741,500
Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 3,614,200 | 3,041,400 | 2,772,900
Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 559,200 | 499,700 | 425,600
Total Retail Tariff Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 10,316,100 | 8,664,700 | 7,940,000
Wholesale Transmission Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 436,000 | 453,200 | 340,900
Wholesale Market Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,335,500 | 661,800 | 374,100
Other Revenues from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 110,600 | 114,000 | 111,500
Amortization of/(Reserve for) Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 72,000 | (78,700) |
CL&P |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Revenues | 4,817,744 | 3,637,412 | 3,547,527
NSTAR Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Revenues | 3,583,070 | 3,056,350 | 2,941,148
PSNH |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Revenues | 1,474,799 | 1,177,248 | 1,079,095
Operating Segments | Electric Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 9,409,500 | 7,404,000 | 7,038,600
Alternative Revenue Programs | (15,400) | 14,700 | 88,100
Other Revenues | 11,200 | 4,900 | 5,600
Operating Revenues | 9,405,300 | 7,423,600 | 7,132,300
Operating Segments | Electric Distribution | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 4,796,100 | 3,989,800 | 3,951,500
Operating Segments | Electric Distribution | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 2,903,300 | 2,486,100 | 2,353,400
Operating Segments | Electric Distribution | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 374,900 | 345,300 | 327,100
Operating Segments | Electric Distribution | Total Retail Tariff Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 8,074,300 | 6,821,200 | 6,632,000
Operating Segments | Electric Distribution | Wholesale Transmission Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Operating Segments | Electric Distribution | Wholesale Market Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,190,900 | 575,800 | 327,300
Operating Segments | Electric Distribution | Other Revenues from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 72,300 | 78,100 | 79,300
Operating Segments | Electric Distribution | Amortization of/(Reserve for) Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 72,000 | (71,100) |
Operating Segments | Natural Gas Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 2,199,500 | 1,752,300 | 1,162,900
Alternative Revenue Programs | 14,800 | 37,000 | 44,700
Other Revenues | 1,300 | 300 | 1,100
Operating Revenues | 2,215,600 | 1,789,600 | 1,208,700
Operating Segments | Natural Gas Distribution | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,204,900 | 1,000,300 | 644,900
Operating Segments | Natural Gas Distribution | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 648,500 | 497,600 | 361,900
Operating Segments | Natural Gas Distribution | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 199,700 | 167,200 | 107,400
Operating Segments | Natural Gas Distribution | Total Retail Tariff Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 2,053,100 | 1,665,100 | 1,114,200
Operating Segments | Natural Gas Distribution | Wholesale Transmission Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Operating Segments | Natural Gas Distribution | Wholesale Market Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 140,800 | 82,100 | 43,000
Operating Segments | Natural Gas Distribution | Other Revenues from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 5,600 | 5,100 | 5,700
Operating Segments | Natural Gas Distribution | Amortization of/(Reserve for) Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 |
Operating Segments | Electric Transmission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,715,300 | 1,759,900 | 1,570,600
Alternative Revenue Programs | 92,700 | (126,100) | (35,200)
Other Revenues | 700 | 800 | 700
Operating Revenues | 1,808,700 | 1,634,600 | 1,536,100
Operating Segments | Electric Transmission | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Operating Segments | Electric Transmission | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Operating Segments | Electric Transmission | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Operating Segments | Electric Transmission | Total Retail Tariff Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Operating Segments | Electric Transmission | Wholesale Transmission Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,700,500 | 1,751,300 | 1,557,300
Operating Segments | Electric Transmission | Wholesale Market Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Operating Segments | Electric Transmission | Other Revenues from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 14,100 | 13,600 | 13,300
Operating Segments | Electric Transmission | Amortization of/(Reserve for) Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 700 | (5,000) |
Operating Segments | Water Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 224,400 | 209,400 | 219,600
Alternative Revenue Programs | (2,500) | 1,500 | (4,700)
Other Revenues | 600 | 400 | 500
Operating Revenues | 222,500 | 211,300 | 215,400
Operating Segments | Water Distribution | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 141,700 | 133,500 | 145,100
Operating Segments | Water Distribution | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 66,500 | 62,800 | 62,400
Operating Segments | Water Distribution | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 4,700 | 4,300 | 4,800
Operating Segments | Water Distribution | Total Retail Tariff Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 212,900 | 200,600 | 212,300
Operating Segments | Water Distribution | Wholesale Transmission Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Operating Segments | Water Distribution | Wholesale Market Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 3,800 | 3,900 | 3,800
Operating Segments | Water Distribution | Other Revenues from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 8,400 | 7,500 | 3,500
Operating Segments | Water Distribution | Amortization of/(Reserve for) Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | (700) | (2,600) |
Operating Segments | CL&P |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 5,343,200 | 4,238,900 | 4,044,700
Alternative Revenue Programs | 56,500 | (78,900) | (4,200)
Other Revenues | 1,800 | 400 | 2,200
Operating Segments | CL&P | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 2,397,200 | 1,994,200 | 2,011,100
Operating Segments | CL&P | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,067,900 | 890,600 | 878,300
Operating Segments | CL&P | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 146,400 | 131,400 | 137,500
Operating Segments | CL&P | Total Retail Tariff Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 3,611,500 | 3,016,200 | 3,026,900
Operating Segments | CL&P | Wholesale Transmission Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 755,100 | 863,300 | 754,800
Operating Segments | CL&P | Wholesale Market Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 873,700 | 408,800 | 230,100
Operating Segments | CL&P | Other Revenues from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 30,200 | 26,700 | 32,900
Operating Segments | CL&P | Amortization of/(Reserve for) Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 72,700 | (76,100) | 0
Operating Segments | NSTAR Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 4,127,300 | 3,541,600 | 3,327,500
Alternative Revenue Programs | 700 | (15,100) | 54,500
Other Revenues | 7,200 | 3,400 | 3,500
Operating Segments | NSTAR Electric | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,601,800 | 1,375,800 | 1,365,800
Operating Segments | NSTAR Electric | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,457,400 | 1,265,000 | 1,176,800
Operating Segments | NSTAR Electric | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 135,800 | 119,100 | 106,400
Operating Segments | NSTAR Electric | Total Retail Tariff Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 3,195,000 | 2,759,900 | 2,649,000
Operating Segments | NSTAR Electric | Wholesale Transmission Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 670,400 | 616,300 | 576,500
Operating Segments | NSTAR Electric | Wholesale Market Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 215,000 | 109,200 | 58,400
Operating Segments | NSTAR Electric | Other Revenues from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 46,900 | 56,200 | 43,600
Operating Segments | NSTAR Electric | Amortization of/(Reserve for) Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Operating Segments | PSNH |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,659,600 | 1,387,600 | 1,241,300
Alternative Revenue Programs | 20,100 | (17,400) | 2,600
Other Revenues | 2,900 | 1,900 | 600
Operating Segments | PSNH | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 797,100 | 619,800 | 574,600
Operating Segments | PSNH | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 380,800 | 332,200 | 299,900
Operating Segments | PSNH | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 92,700 | 94,800 | 83,200
Operating Segments | PSNH | Total Retail Tariff Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,270,600 | 1,046,800 | 957,700
Operating Segments | PSNH | Wholesale Transmission Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 275,000 | 271,700 | 226,000
Operating Segments | PSNH | Wholesale Market Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 102,200 | 57,800 | 38,800
Operating Segments | PSNH | Other Revenues from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 11,800 | 11,300 | 14,200
Operating Segments | PSNH | Amortization of/(Reserve for) Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 4,600
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,435,500 | 1,354,000 | 1,235,900
Alternative Revenue Programs | 0 | 0 | 0
Other Revenues | 0 | 0 | 0
Operating Revenues | 1,435,500 | 1,354,000 | 1,235,900
Other | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Other | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Other | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Other | Total Retail Tariff Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Other | Wholesale Transmission Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 86,600 | 74,200
Other | Wholesale Market Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Other | Other Revenues from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,435,500 | 1,267,400 | 1,161,700
Other | Amortization of/(Reserve for) Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 |
Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | (2,714,000) | (2,664,600) | (2,461,100)
Alternative Revenue Programs | (84,300) | 114,600 | 37,100
Other Revenues | 0 | 0 | 0
Operating Revenues | (2,798,300) | (2,550,000) | (2,424,000)
Eliminations | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Eliminations | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | (4,100) | (5,100) | (4,800)
Eliminations | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | (20,100) | (17,100) | (13,700)
Eliminations | Total Retail Tariff Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | (24,200) | (22,200) | (18,500)
Eliminations | Wholesale Transmission Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | (1,264,500) | (1,384,700) | (1,290,600)
Eliminations | Wholesale Market Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Eliminations | Other Revenues from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | (1,425,300) | (1,257,700) | (1,152,000)
Eliminations | Amortization of/(Reserve for) Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 |
Consolidations Eliminations | CL&P |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Revenues | (583,800) | (523,000) | (495,200)
Consolidations Eliminations | NSTAR Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Revenues | (552,100) | (473,500) | (444,400)
Consolidations Eliminations | PSNH |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Revenues | $ (207,800) | $ (194,900) | $ (165,400)

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
Name: | us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue that is not accounted for under Topic 606. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
Name: | us-gaap_RevenueNotFromContractWithCustomer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue that is not accounted for under Topic 606, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)(e)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
Name: | us-gaap_RevenueNotFromContractWithCustomerOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iv)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iv)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iii)(A)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(i)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(i)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(5)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iii)(A)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(5)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 19: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 20: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-05(b)(2)) -URI https://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884 Reference 21: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iii)(B)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 22: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(ii)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 23: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_ProductOrServiceAxis=es_ResidentialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=es_CommercialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=es_IndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=es_TotalRetailSalesRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=es_WholesaleTransmissionRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=es_WholesaleMarketSalesRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=es_OtherRevenueAdjustmentsfromContractswithCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=es_AmortizationOfReservesForRevenuesSubjectToRefundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=es_TheConnecticutLightAndPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=es_NstarElectricCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=es_PublicServiceCompanyOfNewHampshirePSNHMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=es_EversourceElectricDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=es_NaturalGasDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=es_EversourceElectricTransmissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=es_WaterDistributionSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_IntersegmentEliminationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=srt_ConsolidationEliminationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |