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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 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
Borrowings outstanding | $ 1,048.0 | $ 1,442.2
Available borrowing capacity | $ 952.0 | $ 557.8
Weighted-average interest rate (in percent) | 5.22% | 4.63%
NSTAR Electric |  |
Debt Instrument [Line Items] |  |
Borrowings outstanding | $ 147.5 | $ 0.0
Available borrowing capacity | $ 502.5 | $ 650.0
Weighted-average interest rate (in percent) | 4.77% | 0.00%

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