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REVENUES - Operating Revenues Disaggregated by Revenue Source (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | $ 11,890,600 | $ 12,270,200 | $ 9,815,000
Alternative Revenue Programs | (6,000) | 5,300 | 41,700
Other Revenues | 26,100 | 13,800 | 6,400
Operating Revenues | 11,910,705 | 12,289,336 | 9,863,085
Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 6,344,300 | 6,142,700 | 5,123,600
Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 3,595,900 | 3,614,200 | 3,041,400
Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 524,000 | 559,200 | 499,700
Total Retail Tariff Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 10,464,200 | 10,316,100 | 8,664,700
Wholesale Transmission Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 467,000 | 436,000 | 453,200
Wholesale Market Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 835,600 | 1,335,500 | 661,800
Other Revenues from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 119,500 | 110,600 | 114,000
Amortization of Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 4,300 | 72,000 | (78,700)
CL&P |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Revenues | 4,578,804 | 4,817,744 | 3,637,412
NSTAR Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Revenues | 3,515,539 | 3,583,070 | 3,056,350
PSNH |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Revenues | 1,447,873 | 1,474,799 | 1,177,248
Operating Segments | Electric Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 9,007,400 | 9,409,500 | 7,404,000
Alternative Revenue Programs | (54,300) | (15,400) | 14,700
Other Revenues | 20,400 | 11,200 | 4,900
Operating Revenues | 8,973,500 | 9,405,300 | 7,423,600
Operating Segments | Electric Distribution | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 5,054,200 | 4,796,100 | 3,989,800
Operating Segments | Electric Distribution | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 2,893,200 | 2,903,300 | 2,486,100
Operating Segments | Electric Distribution | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 352,400 | 374,900 | 345,300
Operating Segments | Electric Distribution | Total Retail Tariff Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 8,299,800 | 8,074,300 | 6,821,200
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 | 625,000 | 1,190,900 | 575,800
Operating Segments | Electric Distribution | Other Revenues from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 82,600 | 72,300 | 78,100
Operating Segments | Electric Distribution | Amortization of Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 72,000 | (71,100)
Operating Segments | Natural Gas Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 2,182,200 | 2,199,500 | 1,752,300
Alternative Revenue Programs | 35,500 | 14,800 | 37,000
Other Revenues | 4,000 | 1,300 | 300
Operating Revenues | 2,221,700 | 2,215,600 | 1,789,600
Operating Segments | Natural Gas Distribution | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,145,400 | 1,204,900 | 1,000,300
Operating Segments | Natural Gas Distribution | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 637,700 | 648,500 | 497,600
Operating Segments | Natural Gas Distribution | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 186,800 | 199,700 | 167,200
Operating Segments | Natural Gas Distribution | Total Retail Tariff Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,969,900 | 2,053,100 | 1,665,100
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 | 206,700 | 140,800 | 82,100
Operating Segments | Natural Gas Distribution | Other Revenues from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 5,600 | 5,600 | 5,100
Operating Segments | Natural Gas Distribution | Amortization of Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Operating Segments | Electric Transmission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,796,400 | 1,715,300 | 1,759,900
Alternative Revenue Programs | 118,900 | 92,700 | (126,100)
Other Revenues | 600 | 700 | 800
Operating Revenues | 1,915,900 | 1,808,700 | 1,634,600
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 | 1,777,500 | 1,700,500 | 1,751,300
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 | 14,600 | 14,100 | 13,600
Operating Segments | Electric Transmission | Amortization of Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 4,300 | 700 | (5,000)
Operating Segments | Water Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 231,000 | 224,400 | 209,400
Alternative Revenue Programs | 400 | (2,500) | 1,500
Other Revenues | 1,100 | 600 | 400
Operating Revenues | 232,500 | 222,500 | 211,300
Operating Segments | Water Distribution | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 144,700 | 141,700 | 133,500
Operating Segments | Water Distribution | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 69,800 | 66,500 | 62,800
Operating Segments | Water Distribution | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 4,500 | 4,700 | 4,300
Operating Segments | Water Distribution | Total Retail Tariff Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 219,000 | 212,900 | 200,600
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 | 3,900 | 3,800 | 3,900
Operating Segments | Water Distribution | Other Revenues from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 8,100 | 8,400 | 7,500
Operating Segments | Water Distribution | Amortization of Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | (700) | (2,600)
Operating Segments | CL&P |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 5,077,600 | 5,343,200 | 4,238,900
Alternative Revenue Programs | 66,800 | 56,500 | (78,900)
Other Revenues | 9,600 | 1,800 | 400
Operating Segments | CL&P | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 2,597,800 | 2,397,200 | 1,994,200
Operating Segments | CL&P | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,082,100 | 1,067,900 | 890,600
Operating Segments | CL&P | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 137,200 | 146,400 | 131,400
Operating Segments | CL&P | Total Retail Tariff Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 3,817,100 | 3,611,500 | 3,016,200
Operating Segments | CL&P | Wholesale Transmission Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 794,700 | 755,100 | 863,300
Operating Segments | CL&P | Wholesale Market Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 429,100 | 873,700 | 408,800
Operating Segments | CL&P | Other Revenues from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 32,400 | 30,200 | 26,700
Operating Segments | CL&P | Amortization of Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 4,300 | 72,700 | (76,100)
Operating Segments | NSTAR Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 4,129,400 | 4,127,300 | 3,541,600
Alternative Revenue Programs | (52,000) | 700 | (15,100)
Other Revenues | 8,400 | 7,200 | 3,400
Operating Segments | NSTAR Electric | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,691,000 | 1,601,800 | 1,375,800
Operating Segments | NSTAR Electric | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,442,300 | 1,457,400 | 1,265,000
Operating Segments | NSTAR Electric | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 123,200 | 135,800 | 119,100
Operating Segments | NSTAR Electric | Total Retail Tariff Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 3,256,500 | 3,195,000 | 2,759,900
Operating Segments | NSTAR Electric | Wholesale Transmission Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 692,000 | 670,400 | 616,300
Operating Segments | NSTAR Electric | Wholesale Market Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 131,800 | 215,000 | 109,200
Operating Segments | NSTAR Electric | Other Revenues from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 49,100 | 46,900 | 56,200
Operating Segments | NSTAR Electric | Amortization of 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 | 1,600,000 | 1,659,600 | 1,387,600
Alternative Revenue Programs | 49,800 | 20,100 | (17,400)
Other Revenues | 3,000 | 2,900 | 1,900
Operating Segments | PSNH | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 765,400 | 797,100 | 619,800
Operating Segments | PSNH | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 369,600 | 380,800 | 332,200
Operating Segments | PSNH | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 92,000 | 92,700 | 94,800
Operating Segments | PSNH | Total Retail Tariff Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,227,000 | 1,270,600 | 1,046,800
Operating Segments | PSNH | Wholesale Transmission Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 290,800 | 275,000 | 271,700
Operating Segments | PSNH | Wholesale Market Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 64,100 | 102,200 | 57,800
Operating Segments | PSNH | Other Revenues from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 18,100 | 11,800 | 11,300
Operating Segments | PSNH | Amortization of Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 1,636,600 | 1,435,500 | 1,354,000
Alternative Revenue Programs | 0 | 0 | 0
Other Revenues | 0 | 0 | 0
Operating Revenues | 1,636,600 | 1,435,500 | 1,354,000
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 | 0 | 86,600
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 | 1,636,600 | 1,435,500 | 1,267,400
Other | Amortization of Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | (2,963,000) | (2,714,000) | (2,664,600)
Alternative Revenue Programs | (106,500) | (84,300) | 114,600
Other Revenues | 0 | 0 | 0
Operating Revenues | (3,069,500) | (2,798,300) | (2,550,000)
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 | (4,800) | (4,100) | (5,100)
Eliminations | Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | (19,700) | (20,100) | (17,100)
Eliminations | Total Retail Tariff Sales Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | (24,500) | (24,200) | (22,200)
Eliminations | Wholesale Transmission Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | (1,310,500) | (1,264,500) | (1,384,700)
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 | (1,628,000) | (1,425,300) | (1,257,700)
Eliminations | Amortization of Revenues Subject to Refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0
Consolidations Eliminations | CL&P |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Revenues | (575,200) | (583,800) | (523,000)
Consolidations Eliminations | NSTAR Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Revenues | (570,300) | (552,100) | (473,500)
Consolidations Eliminations | PSNH |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Revenues | $ (204,900) | $ (207,800) | $ (194,900)

X
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- 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 -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-40 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-4 + Details
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