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SHORT-TERM DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Borrowings Outstanding | $ 1,505,450 | $ 1,249,325
Eversource Parent Commercial Paper Program |  |
Line of Credit Facility [Line Items] |  |
Borrowings Outstanding | 1,342,950 | 1,054,325
Commercial Paper | Eversource Parent Commercial Paper Program |  |
Line of Credit Facility [Line Items] |  |
Borrowings Outstanding | 1,343,000 | 1,054,300
Available Borrowing Capacity | $ 657,000 | $ 945,700
Weighted-Average Interest Rate (as a percentage) | 0.31% | 0.25%
Commercial Paper | NSTAR Electric Company |  |
Line of Credit Facility [Line Items] |  |
Borrowings Outstanding | $ 162,500 | $ 195,000
Available Borrowing Capacity | $ 487,500 | $ 455,000
Weighted-Average Interest Rate (as a percentage) | 0.14% | 0.16%

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