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SEGMENT INFORMATION - Schedule of Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues |  |  | $ 11,900,809 | $ 11,910,705 | $ 12,289,336
Depreciation and Amortization |  |  | (1,776,400) | (815,700) | (1,643,100)
Operations, Excluding Storm Costs |  |  |  |  |
Corporate Shared Services, (General and Administrative) |  |  |  |  |
Storm Costs |  |  |  |  |
Employee Benefits |  |  |  |  |
Uncollectible Expense |  |  |  |  |
Operations and Maintenance |  |  | (2,012,926) | (1,895,703) | (1,865,328)
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (2) |  |  | (5,405,800) | (6,800,000) | (6,582,700)
Loss on Pending Sale of Aquarion |  |  | (297,000) | 0 | 0
Operating Income |  |  | 2,408,709 | 2,399,335 | 2,198,154
Interest Expense |  |  | (1,111,336) | (855,441) | (678,274)
Loss on Offshore Wind Investments | $ (1,766,000) | $ (401,000) | (464,019) | (2,167,000) | 0
Interest Income |  |  | 138,200 | 94,200 | 50,500
Other Income/(Loss), Net |  |  | 272,300 | 253,900 | 295,600
Income Tax (Expense)/Benefit |  |  | (424,664) | (159,684) | (453,574)
Net Income/(Loss) |  |  | 819,172 | (434,721) | 1,412,394
Net Income Attributable to Noncontrolling Interests |  |  | (7,519) | (7,519) | (7,519)
Net Income Attributable to Common Shareholders |  |  | 811,653 | (442,240) | 1,404,875
Total Assets (as of) | 55,612,245 |  | 59,594,529 | 55,612,245 |
Cash Flows Used for Investments in Plant |  |  | 4,480,500 | 4,336,800 | 3,441,900
CL&P |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues |  |  | 4,614,977 | 4,578,804 | 4,817,744
Operations and Maintenance |  |  | (815,345) | (733,287) | (707,162)
Operating Income |  |  | 860,470 | 821,443 | 790,214
Interest Expense |  |  | (231,004) | (193,361) | (169,348)
Income Tax (Expense)/Benefit |  |  | (194,459) | (170,909) | (171,198)
Total Assets (as of) | 15,849,624 |  | 16,839,845 | 15,849,624 |
NSTAR Electric |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues |  |  | 3,720,877 | 3,515,539 | 3,583,070
Operations and Maintenance |  |  | (735,019) | (668,466) | (640,834)
Operating Income |  |  | 858,318 | 722,649 | 652,636
Interest Expense |  |  | (222,794) | (189,254) | (162,892)
Income Tax (Expense)/Benefit |  |  | (190,576) | (152,996) | (139,977)
Total Assets (as of) | 16,271,513 |  | 18,075,248 | 16,271,513 |
PSNH |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues |  |  | 1,294,493 | 1,447,873 | 1,474,799
Operations and Maintenance |  |  | (288,342) | (284,442) | (255,991)
Operating Income |  |  | 331,775 | 300,862 | 249,766
Interest Expense |  |  | (77,770) | (72,786) | (59,548)
Income Tax (Expense)/Benefit |  |  | (70,245) | (59,014) | (51,314)
Total Assets (as of) | 5,993,451 |  | 6,641,941 | 5,993,451 |
Operating Segments | Electric Distribution |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues |  |  | 9,066,500 | 8,973,500 | 9,405,300
Depreciation and Amortization |  |  | (934,700) | (18,200) | (970,400)
Operations, Excluding Storm Costs |  |  | (447,300) | (418,200) | (416,000)
Corporate Shared Services, (General and Administrative) |  |  | (457,100) | (397,200) | (371,000)
Storm Costs |  |  | (76,800) | (71,100) | (74,400)
Employee Benefits |  |  | (202,500) | (175,600) | (189,600)
Uncollectible Expense |  |  | (182,800) | (161,900) | (107,300)
Other |  |  | (135,900) | (167,900) | (153,000)
Operations and Maintenance |  |  | (1,502,400) | (1,391,900) | (1,311,300)
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (2) |  |  | (5,685,300) | (6,712,700) | (6,352,400)
Loss on Pending Sale of Aquarion |  |  | 0 |  |
Operating Income |  |  | 944,100 | 850,700 | 771,200
Interest Expense |  |  | (359,100) | (291,700) | (253,100)
Loss on Offshore Wind Investments |  |  | 0 | 0 |
Interest Income |  |  | 114,600 | 74,500 | 45,100
Other Income/(Loss), Net |  |  | 134,700 | 136,200 | 180,400
Income Tax (Expense)/Benefit |  |  | (198,000) | (157,100) | (146,200)
Net Income/(Loss) |  |  | 636,300 | 612,600 | 597,400
Net Income Attributable to Noncontrolling Interests |  |  | (4,600) | (4,600) | (4,600)
Net Income Attributable to Common Shareholders |  |  | 631,700 | 608,000 | 592,800
Total Assets (as of) | 29,426,400 |  | 32,031,900 | 29,426,400 |
Cash Flows Used for Investments in Plant |  |  | 1,807,400 | 1,668,100 | 1,172,600
Operating Segments | Natural Gas Distribution |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues |  |  | 2,103,900 | 2,221,700 | 2,215,600
Depreciation and Amortization |  |  | (216,600) | (214,200) | (157,600)
Operations, Excluding Storm Costs |  |  | (180,900) | (172,800) | (182,500)
Corporate Shared Services, (General and Administrative) |  |  | (106,100) | (103,000) | (109,800)
Storm Costs |  |  | 0 | 0 | 0
Employee Benefits |  |  | (76,900) | (76,600) | (79,800)
Uncollectible Expense |  |  | (48,400) | (64,800) | (36,000)
Other |  |  | (29,200) | (27,500) | (30,300)
Operations and Maintenance |  |  | (441,500) | (444,700) | (438,400)
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (2) |  |  | (1,007,100) | (1,217,900) | (1,288,600)
Loss on Pending Sale of Aquarion |  |  | 0 |  |
Operating Income |  |  | 438,700 | 344,900 | 331,000
Interest Expense |  |  | (99,200) | (85,700) | (71,400)
Loss on Offshore Wind Investments |  |  | 0 | 0 |
Interest Income |  |  | 23,200 | 18,200 | 10,200
Other Income/(Loss), Net |  |  | 22,400 | 20,400 | 33,600
Income Tax (Expense)/Benefit |  |  | (94,100) | (73,000) | (69,200)
Net Income/(Loss) |  |  | 291,000 | 224,800 | 234,200
Net Income Attributable to Noncontrolling Interests |  |  | 0 | 0 | 0
Net Income Attributable to Common Shareholders |  |  | 291,000 | 224,800 | 234,200
Total Assets (as of) | 8,775,300 |  | 9,786,700 | 8,775,300 |
Cash Flows Used for Investments in Plant |  |  | 934,500 | 844,100 | 710,300
Operating Segments | Electric Transmission |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues |  |  | 2,121,000 | 1,915,900 | 1,808,700
Depreciation and Amortization |  |  | (405,100) | (371,200) | (337,400)
Operations, Excluding Storm Costs |  |  | (135,100) | (124,700) | (117,700)
Corporate Shared Services, (General and Administrative) |  |  | (74,600) | (62,500) | (58,400)
Storm Costs |  |  | 0 | (1,300) | (100)
Employee Benefits |  |  | (52,700) | (46,100) | (39,600)
Uncollectible Expense |  |  | 0 | 0 | 0
Other |  |  | (71,100) | (57,400) | (72,600)
Operations and Maintenance |  |  | (333,500) | (292,000) | (288,400)
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (2) |  |  | (276,000) | (258,500) | (260,000)
Loss on Pending Sale of Aquarion |  |  | 0 |  |
Operating Income |  |  | 1,106,400 | 994,200 | 922,900
Interest Expense |  |  | (172,400) | (163,700) | (145,500)
Loss on Offshore Wind Investments |  |  | 0 | 0 |
Interest Income |  |  | 300 | 400 | 500
Other Income/(Loss), Net |  |  | 50,500 | 41,200 | 37,900
Income Tax (Expense)/Benefit |  |  | (257,300) | (225,800) | (216,300)
Net Income/(Loss) |  |  | 727,500 | 646,300 | 599,500
Net Income Attributable to Noncontrolling Interests |  |  | (2,900) | (2,900) | (2,900)
Net Income Attributable to Common Shareholders |  |  | 724,600 | 643,400 | 596,600
Total Assets (as of) | 14,806,500 |  | 16,070,900 | 14,806,500 |
Cash Flows Used for Investments in Plant |  |  | 1,343,300 | 1,406,300 | 1,144,000
Operating Segments | Water Distribution |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues |  |  | 229,300 | 232,500 | 222,500
Depreciation and Amortization |  |  | (32,300) | (56,000) | (50,900)
Operations, Excluding Storm Costs |  |  |  |  |
Corporate Shared Services, (General and Administrative) |  |  |  |  |
Storm Costs |  |  |  |  |
Employee Benefits |  |  |  |  |
Uncollectible Expense |  |  |  |  |
Operations and Maintenance |  |  | (98,700) | (93,200) | (88,400)
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (2) |  |  | (26,300) | (23,900) | (23,400)
Loss on Pending Sale of Aquarion |  |  | (297,000) |  |
Operating Income |  |  | (225,000) | 59,400 | 59,800
Interest Expense |  |  | (36,200) | (38,500) | (34,700)
Loss on Offshore Wind Investments |  |  | 0 | 0 |
Interest Income |  |  | 100 | 0 | 0
Other Income/(Loss), Net |  |  | 7,200 | 5,900 | 8,500
Income Tax (Expense)/Benefit |  |  | 200 | 6,300 | 3,200
Net Income/(Loss) |  |  | (253,700) | 33,100 | 36,800
Net Income Attributable to Noncontrolling Interests |  |  | 0 | 0 | 0
Net Income Attributable to Common Shareholders |  |  | (253,700) | 33,100 | 36,800
Total Assets (as of) | 2,944,800 |  | 2,515,800 | 2,944,800 |
Cash Flows Used for Investments in Plant |  |  | 161,800 | 167,000 | 154,400
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues |  |  | 1,701,300 | 1,636,600 | 1,435,500
Depreciation and Amortization |  |  | (198,700) | (158,800) | (132,600)
Operations, Excluding Storm Costs |  |  |  |  |
Corporate Shared Services, (General and Administrative) |  |  |  |  |
Storm Costs |  |  |  |  |
Employee Benefits |  |  |  |  |
Uncollectible Expense |  |  |  |  |
Operations and Maintenance |  |  | (1,350,500) | (1,325,600) | (1,184,600)
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (2) |  |  | (7,600) | (4,200) | (4,500)
Loss on Pending Sale of Aquarion |  |  | 0 |  |
Operating Income |  |  | 144,500 | 148,000 | 113,800
Interest Expense |  |  | (662,700) | (425,300) | (247,800)
Loss on Offshore Wind Investments |  |  | (464,000) | (2,167,000) |
Interest Income |  |  | 218,300 | 150,600 | 66,300
Other Income/(Loss), Net |  |  | 1,416,900 | (261,800) | 1,600,800
Income Tax (Expense)/Benefit |  |  | 124,500 | 289,900 | (25,100)
Net Income/(Loss) |  |  | 777,500 | (2,265,600) | 1,508,000
Net Income Attributable to Noncontrolling Interests |  |  | 0 | 0 | 0
Net Income Attributable to Common Shareholders |  |  | 777,500 | (2,265,600) | 1,508,000
Total Assets (as of) | 26,337,700 |  | 29,041,100 | 26,337,700 |
Cash Flows Used for Investments in Plant |  |  | 233,500 | 251,300 | 260,600
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues |  |  | (3,321,200) | (3,069,500) | (2,798,300)
Depreciation and Amortization |  |  | 11,000 | 2,700 | 5,800
Operations, Excluding Storm Costs |  |  |  |  |
Corporate Shared Services, (General and Administrative) |  |  |  |  |
Storm Costs |  |  |  |  |
Employee Benefits |  |  |  |  |
Uncollectible Expense |  |  |  |  |
Operations and Maintenance |  |  | 1,713,700 | 1,651,700 | 1,445,800
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (2) |  |  | 1,596,500 | 1,417,200 | 1,346,200
Loss on Pending Sale of Aquarion |  |  | 0 |  |
Operating Income |  |  | 0 | 2,100 | (500)
Interest Expense |  |  | 218,300 | 149,500 | 74,200
Loss on Offshore Wind Investments |  |  | 0 | 0 |
Interest Income |  |  | (218,300) | (149,500) | (71,600)
Other Income/(Loss), Net |  |  | (1,359,400) | 312,000 | (1,565,600)
Income Tax (Expense)/Benefit |  |  | 0 | 0 | 0
Net Income/(Loss) |  |  | (1,359,400) | 314,100 | (1,563,500)
Net Income Attributable to Noncontrolling Interests |  |  | 0 | 0 | 0
Net Income Attributable to Common Shareholders |  |  | (1,359,400) | 314,100 | (1,563,500)
Total Assets (as of) | $ (26,678,500) |  | (29,851,900) | (26,678,500) |
Cash Flows Used for Investments in Plant |  |  | $ 0 | $ 0 | $ 0

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