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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) - Allowance for Doubtful Accounts - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 554,455 $ 486,297 $ 417,406
Additions, Charged to Costs and Expense 74,069 72,468 61,876
Additions, Charged to Other Accounts 119,659 158,205 112,533
Deductions 192,019 162,515 105,518
Balance at end of period 556,164 554,455 486,297
CL&P      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 296,030 225,320 181,319
Additions, Charged to Costs and Expense 17,190 11,675 15,578
Additions, Charged to Other Accounts 46,840 126,360 59,485
Deductions 80,952 67,325 31,062
Balance at end of period 279,108 296,030 225,320
NSTAR Electric      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 97,026 94,958 97,005
Additions, Charged to Costs and Expense 33,607 22,791 21,550
Additions, Charged to Other Accounts 37,653 17,488 12,412
Deductions 53,376 38,211 36,009
Balance at end of period 114,910 97,026 94,958
PSNH      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 14,322 29,236 24,331
Additions, Charged to Costs and Expense 4,688 3,989 9,211
Additions, Charged to Other Accounts 5,131 (8,735) 2,539
Deductions 10,051 10,168 6,845
Balance at end of period $ 14,090 $ 14,322 $ 29,236