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SHORT-TERM DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Borrowings Outstanding | $ 1,442,200 | $ 1,505,450
Eversource Parent Commercial Paper Program |  |
Line of Credit Facility [Line Items] |  |
Borrowings Outstanding | 1,442,200 | 1,342,950
Commercial Paper | Eversource Parent Commercial Paper Program |  |
Line of Credit Facility [Line Items] |  |
Borrowings Outstanding | 1,442,200 | 1,343,000
Available Borrowing Capacity | $ 557,800 | $ 657,000
Weighted-Average Interest Rate (as a percentage) | 4.63% | 0.31%
Commercial Paper | NSTAR Electric |  |
Line of Credit Facility [Line Items] |  |
Borrowings Outstanding | $ 0 | $ 162,500
Available Borrowing Capacity | $ 650,000 | $ 487,500
Weighted-Average Interest Rate (as a percentage) | 0.00% | 0.14%

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