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LONG-TERM DEBT - Schedule of Issuances and Repayments (Details) - USD ($) $ in Thousands	1 Months Ended								12 Months Ended
	Jan. 31, 2025	Oct. 31, 2024	Aug. 31, 2024	Jul. 31, 2024	Jun. 30, 2024	May 31, 2024	Apr. 30, 2024	Jan. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Repayments of debt									$ (1,949,995)	$ (2,008,470)	$ (1,175,000)
CL&P
Debt Instrument [Line Items]
Repayments of debt									(139,800)	(400,000)	0
NSTAR Electric
Debt Instrument [Line Items]
Repayments of debt									0	(80,000)	(400,000)
PSNH
Debt Instrument [Line Items]
Repayments of debt									0	(325,000)	0
CL&P 2024 Series A First Mortgage Bonds | First Mortgage Bonds | CL&P
Debt Instrument [Line Items]
Interest rate								4.65%
Issuance								$ 350,000
CL&P Series B First Mortgage Bonds | First Mortgage Bonds | CL&P
Debt Instrument [Line Items]
Interest rate			4.95%
Issuance			$ 300,000
CL&P Series D First Mortgage Bonds | First Mortgage Bonds | CL&P
Debt Instrument [Line Items]
Interest rate		7.875%
Repayments of debt		$ (139,800)
CL&P 2025 Series A First Mortgage Bonds | First Mortgage Bonds | CL&P | Subsequent Event
Debt Instrument [Line Items]
Interest rate	4.95%
Issuance	$ 400,000
NSTAR Electric Debentures | Unsecured Debt | NSTAR Electric
Debt Instrument [Line Items]
Interest rate						5.40%
Issuance						$ 600,000
PSNH Series X First Mortgage Bonds | First Mortgage Bonds | PSNH
Debt Instrument [Line Items]
Interest rate							5.35%
Issuance							$ 300,000
NSTAR Gas Series W First Mortgage Bonds | First Mortgage Bonds | NSTAR Gas
Debt Instrument [Line Items]
Interest rate					5.29%
Issuance					$ 160,000
NSTAR Gas Series X First Mortgage Bonds | First Mortgage Bonds | NSTAR Gas
Debt Instrument [Line Items]
Interest rate					5.48%
Issuance					$ 40,000
Yankee Gas Series W First Mortgage Bonds | First Mortgage Bonds | Yankee Gas Services Company
Debt Instrument [Line Items]
Interest rate				5.50%
Issuance				$ 90,000
Yankee Gas Series X First Mortgage Bonds | First Mortgage Bonds | Yankee Gas Services Company
Debt Instrument [Line Items]
Interest rate				5.74%
Issuance				$ 90,000
Yankee Gas Series P First Mortgage Bonds | First Mortgage Bonds | Yankee Gas Services Company
Debt Instrument [Line Items]
Interest rate		2.23%
Repayments of debt		$ (100,000)
EGMA Series E First Mortgage Bonds | First Mortgage Bonds | Eversource Gas Company of Massachusetts
Debt Instrument [Line Items]
Interest rate		5.17%
Issuance		$ 100,000
Aquarion Senior Notes | Senior Notes | Aquarion Company and its Subsidiaries
Debt Instrument [Line Items]
Interest rate			4.00%
Repayments of debt			$ (360,000)
Aquarion Water Company of Connecticut Senior Notes | Senior Notes | Aquarion Company and its Subsidiaries
Debt Instrument [Line Items]
Interest rate			5.57%
Issuance			$ 70,000
Eversource
Debt Instrument [Line Items]
Repayments of debt									$ (1,350,000)	$ (1,200,000)	$ (750,000)
Eversource | Eversource Parent Series DD Senior Notes | Senior Notes
Debt Instrument [Line Items]
Interest rate								5.00%
Issuance								$ 350,000
Eversource | Eversource Parent Series EE Senior Notes | Senior Notes
Debt Instrument [Line Items]
Interest rate								5.50%
Issuance								$ 650,000
Eversource | Eversource Parent Series FF Senior Notes | Senior Notes
Debt Instrument [Line Items]
Interest rate							5.85%
Issuance							$ 700,000
Eversource | Eversource Parent Series GG Senior Notes | Senior Notes
Debt Instrument [Line Items]
Interest rate							5.95%
Issuance							$ 700,000
Eversource | Eversource Parent Series X Senior Notes | Senior Notes
Debt Instrument [Line Items]
Interest rate					4.20%
Repayments of debt					$ (900,000)
Eversource | Eversource Parent Series L Senior Notes | Senior Notes
Debt Instrument [Line Items]
Interest rate		2.90%
Repayments of debt		$ (450,000)
Eversource | Eversource Parent Series H Senior Notes | Senior Notes | Subsequent Event
Debt Instrument [Line Items]
Interest rate	3.15%
Repayments of debt	$ (300,000)

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