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SEGMENT INFORMATION - Schedule of Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
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