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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) - Allowance for Doubtful Accounts - USD ($) $ in Thousands | 12 Months Ended
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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

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 + Details
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