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SHORT-TERM AND LONG-TERM DEBT - Summary of Long-Term Debt Issuance and Repayments (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2022 | Feb. 28, 2022 | Mar. 31, 2022 | Mar. 31, 2021
Debt Instrument [Line Items] |  |  |  |
Repayments |  |  | $ (770,000) | $ (572,000)
Yankee Gas | First Mortgage | Yankee Gas 8.48% Series B First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 8.48% |  | 8.48% |
Repayments | $ (20,000) |  |  |
Eversource Parent | Senior Notes | Eversource Parent 2.90% Series V Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  | 2.90% |  |
Issuances |  | $ 650,000 |  |
Eversource Parent | Senior Notes | Eversource Parent 3.38% Series W Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  | 3.38% |  |
Issuances |  | $ 650,000 |  |
Eversource Parent | Senior Notes | Eversource Parent 2.75% Series K Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 2.75% |  | 2.75% |
Repayments | $ (750,000) |  |  |

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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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