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SHORT-TERM AND LONG-TERM DEBT - Borrowings Outstanding and Available under the Commercial Paper Programs (Details) - Commercial Paper - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Borrowings outstanding | $ 1,203.0 | $ 1,771.9
Available borrowing capacity | $ 797.0 | $ 228.1
Weighted-average interest rate (in percent) | 5.67% | 5.60%
NSTAR Electric |  |
Debt Instrument [Line Items] |  |
Borrowings outstanding | $ 236.5 | $ 365.8
Available borrowing capacity | $ 413.5 | $ 284.2
Weighted-average interest rate (in percent) | 5.37% | 5.40%

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