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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | $ 486,297 | $ 417,406 | $ 358,851
Additions, Charged to Costs and Expense | 72,468 | 61,876 | 60,886
Additions, Charged to Other Accounts | 158,205 | 112,533 | 110,572
Deductions | 162,515 | 105,518 | 112,903
Balance at end of period | 554,455 | 486,297 | 417,406
CL&P |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 225,320 | 181,319 | 157,447
Additions, Charged to Costs and Expense | 11,675 | 15,578 | 13,495
Additions, Charged to Other Accounts | 126,360 | 59,485 | 57,779
Deductions | 67,325 | 31,062 | 47,402
Balance at end of period | 296,030 | 225,320 | 181,319
NSTAR Electric |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 94,958 | 97,005 | 91,583
Additions, Charged to Costs and Expense | 22,791 | 21,550 | 16,649
Additions, Charged to Other Accounts | 17,488 | 12,412 | 20,064
Deductions | 38,211 | 36,009 | 31,291
Balance at end of period | 97,026 | 94,958 | 97,005
PSNH |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 29,236 | 24,331 | 17,157
Additions, Charged to Costs and Expense | 3,989 | 9,211 | 13,113
Additions, Charged to Other Accounts | (8,735) | 2,539 | 3,135
Deductions | 10,168 | 6,845 | 9,074
Balance at end of period | $ 14,322 | $ 29,236 | $ 24,331

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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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