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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) | 12 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) | ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) The changes in accumulated other comprehensive income/(loss) by component, net of tax, are as follows:
| For the Year Ended December 31, 2023 |  | For the Year Ended December 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 January 1st | $ | (0.4) |  |  | $ | (1.2) |  |  | $ | (37.8) |  |  | $ | (39.4) |  |  | $ | (0.4) |  |  | $ | 0.4 |  |  | $ | (42.3) |  |  | $ | (42.3) |
OCI Before Reclassifications | — |  |  | — |  |  | (8.8) |  |  | (8.8) |  |  | — |  |  | (1.6) |  |  | (2.5) |  |  | (4.1) |
Amounts Reclassified from AOCI | — |  |  | 1.2 |  |  | 13.3 |  |  | 14.5 |  |  | — |  |  | — |  |  | 7.0 |  |  | 7.0 |
Net OCI | — |  |  | 1.2 |  |  | 4.5 |  |  | 5.7 |  |  | — |  |  | (1.6) |  |  | 4.5 |  |  | 2.9 |
Balance as of December 31st | $ | (0.4) |  |  | $ | — |  |  | $ | (33.3) |  |  | $ | (33.7) |  |  | $ | (0.4) |  |  | $ | (1.2) |  |  | $ | (37.8) |  |  | $ | (39.4) |
Defined benefit plan OCI amounts before reclassifications relate to actuarial gains and losses that arose during the year and were recognized in AOCI. The unamortized actuarial gains and losses and prior service costs on the defined benefit plans are amortized from AOCI into Other Income, Net over the average future employee service period, and are reflected in amounts reclassified from AOCI. The related tax effects of the defined benefit plan OCI amounts before reclassifications recognized in AOCI were net deferred tax assets of $4.9 million and $1.3 million in 2023 and 2022, respectively and were net deferred tax liabilities of $8.3 million in 2021. The following table sets forth the amounts reclassified from AOCI by component and the impacted line item on the statements of income:
| Amounts Reclassified from AOCI |  |
Eversource (Millions of Dollars) | For the Years Ended December 31, |  | Statements of Income Line Item Impacted
2023 |  | 2022 |  | 2021 |
Qualified Cash Flow Hedging Instruments | $ | — |  |  | $ | — |  |  | $ | (1.7) |  |  | Interest Expense
Tax Effect | — |  |  | — |  |  | 0.7 |  |  | Income Tax Expense
Qualified Cash Flow Hedging Instruments, Net of Tax | — |  |  | — |  |  | (1.0) |  |  |
Unrealized Gains/(Losses) on Marketable Securities | (1.6) |  |  | — |  |  | — |  |  | Other Income, Net
Tax Effect | 0.4 |  |  | — |  |  | — |  |  | Income Tax Expense
Unrealized Gains/(Losses) on Marketable Securities, Net of Tax | (1.2) |  |  | — |  |  | — |  |  |
Defined Benefit Plan Costs: |  |  |  |  |  |  |
Amortization of Actuarial Losses | (7.0) |  |  | (9.0) |  |  | (13.1) |  |  | Other Income, Net (1)
Amortization of Prior Service Cost | (0.3) |  |  | (0.3) |  |  | — |  |  | Other Income, Net (1)
Settlement Loss | (12.4) |  |  | — |  |  | — |  |  | Other Income, Net (1)
Total Defined Benefit Plan Costs | (19.7) |  |  | (9.3) |  |  | (13.1) |  |  |
Tax Effect | 6.4 |  |  | 2.3 |  |  | 3.4 |  |  | Income Tax Expense
Defined Benefit Plan Costs, Net of Tax | (13.3) |  |  | (7.0) |  |  | (9.7) |  |  |
Total Amounts Reclassified from AOCI, Net of Tax | $ | (14.5) |  |  | $ | (7.0) |  |  | $ | (10.7) |  |  |
(1) These amounts are included in the computation of net periodic Pension, SERP and PBOP costs. See Note 1K, "Summary of Significant Accounting Policies – Other Income, Net" and Note 11A, "Employee Benefits – Pension Benefits and Postretirement Benefits Other Than Pension," for further information.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//220/tableOfContent + Details
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