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LONG-TERM DEBT - Narrative (Details) - USD ($) $ in Thousands	Jan. 28, 2025	Dec. 31, 2024	Dec. 18, 2024	Aug. 12, 2024	Jul. 24, 2024	May 01, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Long-term debt		$ 25,701,627					$ 23,588,616
Interest included in payment to settle spent nuclear fuel obligation		4,300					9,500
NSTAR Electric
Debt Instrument [Line Items]
Long-term debt		4,844,920					4,496,947
Line of Credit | NSTAR Electric
Debt Instrument [Line Items]
Amount of long-term debt requested for issuance						$ 2,400,000
Line of Credit | CL&P
Debt Instrument [Line Items]
Amount of long-term debt requested for issuance					$ 1,000,000
Line of Credit | EGMA
Debt Instrument [Line Items]
Amount of long-term debt requested for issuance				$ 325,000
Line of Credit | NSTAR Gas
Debt Instrument [Line Items]
Amount of long-term debt requested for issuance			$ 475,000
Line of Credit | Yankee Gas | Subsequent Event
Debt Instrument [Line Items]
Amount of long-term debt requested for issuance	$ 360,000
Pre-1983 Spent Nuclear Fuel Obligation (CYAPC)
Debt Instrument [Line Items]
Long-term debt		$ 5,600					$ 12,500

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