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EMPLOYEE BENEFITS - Schedule of Funded Status (Details) - Pension and SERP - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 4,617.1	$ 4,936.8
CL&P
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	953.9	977.8
NSTAR Electric
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	969.5	1,051.9
PSNH
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 507.4	$ 522.1

X

- Definition

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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