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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)

3 Months Ended

Mar. 31, 2023

Equity [Abstract]

Changes in Accumulated Other Comprehensive Income/(Loss) by Component, Net of Tax

The changes in accumulated other comprehensive income/(loss) by component, net of tax, are as follows:

			For the Three Months Ended March 31, 2023																								For the Three Months Ended March 31, 2022
Eversource (Millions of Dollars)			Qualified Cash Flow Hedging Instruments						Unrealized Gains/(Losses) on Marketable Securities						Defined Benefit Plans						Total						Qualified Cash Flow Hedging Instruments						Unrealized Gains/(Losses) on Marketable Securities						Defined Benefit Plans						Total
Balance as of Beginning of Period			$	(0.4)					$	(1.2)					$	(37.8)					$	(39.4)					$	(0.4)					$	0.4					$	(42.3)					$	(42.3)
OCI Before Reclassifications			—						—						—						—						—						(0.8)						—						(0.8)
Amounts Reclassified from AOCI			—						1.2						2.0						3.2						—						—						1.5						1.5
Net OCI			—						1.2						2.0						3.2						—						(0.8)						1.5						0.7
Balance as of End of Period			$	(0.4)					$	—					$	(35.8)					$	(36.2)					$	(0.4)					$	(0.4)					$	(40.8)					$	(41.6)

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- References

No definition available.

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- Definition

Tabular disclosure of the components of accumulated other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 20
-URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900

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