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LONG-TERM DEBT - Schedule of Issuances and Repayments (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2023 | Oct. 31, 2022 | Sep. 30, 2022 | Aug. 31, 2022 | Jul. 31, 2022 | Jun. 30, 2022 | May 31, 2022 | Mar. 31, 2022 | Feb. 28, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  | $ (1,175,000) | $ (1,142,500) | $ (327,236)
NSTAR Electric |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  | (400,000) | (250,000) | (95,000)
CL&P |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  | 0 | (120,500) | 0
PSNH |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  | 0 | (282,000) | 0
CL&P 2023 Series A First Mortgage Bonds | Mortgage Bonds | CL&P | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 5.25% |  |  |  |  |  |  |  |  |  |  |
Issuance | $ 500,000 |  |  |  |  |  |  |  |  |  |  |
CL&P 2013 Series A First Mortgage Bonds | Mortgage Bonds | CL&P | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 2.50% |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ (400,000) |  |  |  |  |  |  |  |  |  |  |
NSTAR Electric 2022 Debentures | Debentures | NSTAR Electric |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 4.55% |  |  |  |  |
Issuance |  |  |  |  |  |  | $ 450,000 |  |  |  |  |
NSTAR Electric 2022 Debentures | Debentures | NSTAR Electric |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 4.95% |  |  |  |  |  |  |  |  |
Issuance |  |  | $ 400,000 |  |  |  |  |  |  |  |  |
NSTAR Electric 2012 Debentures | Debentures | NSTAR Electric |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 2.375% |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | $ (400,000) |  |  |  |  |  |  |  |  |  |
PSNH Series W First Mortgage Bonds | Mortgage Bonds | PSNH | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 5.15% |  |  |  |  |  |  |  |  |  |  |
Issuance | $ 300,000 |  |  |  |  |  |  |  |  |  |  |
Yankee Gas Series B First Mortgage Bonds | First Mortgage Bonds | Yankee Gas Services Company |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 8.48% |  |  |  |
Repayments of debt |  |  |  |  |  |  |  | $ (20,000) |  |  |  |
Yankee Gas Series U First Mortgage Bonds | First Mortgage Bonds | Yankee Gas Services Company |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 4.31% |  |  |  |  |  |  |  |  |
Issuance |  |  | $ 100,000 |  |  |  |  |  |  |  |  |
EGMA Series C First Mortgage Bonds | First Mortgage Bonds | EGMA |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 4.70% |  |  |  |  |  |
Issuance |  |  |  |  |  | $ 100,000 |  |  |  |  |  |
NSTAR Gas Series V First Mortgage Bonds | First Mortgage Bonds | NSTAR Gas |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 4.40% |  |  |  |  |  |  |
Issuance |  |  |  |  | $ 125,000 |  |  |  |  |  |  |
Aquarion Water Company of New Hampshire General Mortgage Bonds | General Mortgage Bonds (GMB) | Aquarion Water Company |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 4.45% |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | $ (5,000) |  |  |  |  |  |  |
Aquarion Water Company of Connecticut Senior Notes | Senior Notes | Aquarion Water Company |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.69% |  |  |  |  |  |  |  |
Issuance |  |  |  | $ 70,000 |  |  |  |  |  |  |  |
Eversource |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  | $ (750,000) | $ (450,000) | $ 0
Eversource | Eversource Parent Series V Senior Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 2.90% |  |  |
Issuance |  |  |  |  |  |  |  |  | $ 650,000 |  |  |
Eversource | Eversource Parent Series W Senior Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 3.375% |  |  |
Issuance |  |  |  |  |  |  |  |  | $ 650,000 |  |  |
Eversource | Eversource Parent Series X Senior Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 4.20% |  |  |  |  |  |
Issuance |  |  |  |  |  | $ 900,000 |  |  |  |  |  |
Eversource | Eversource Parent Series Y Senior Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 4.60% |  |  |  |  |  |
Issuance |  |  |  |  |  | $ 600,000 |  |  |  |  |  |
Eversource | Eversource Parent Series K Senior Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 2.75% |  |  |  |
Repayments of debt |  |  |  |  |  |  |  | $ (750,000) |  |  |  |

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