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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 12 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Carrying Amounts and Estimated Fair Values of Financial Instruments | The fair values provided in the table below are classified as Level 2 within the fair value hierarchy. Carrying amounts and estimated fair values are as follows:
| Eversource |  | CL&P |  | NSTAR Electric |  | PSNH
(Millions of Dollars) | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
As of December 31, 2023: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Not Subject to Mandatory Redemption | $ | 155.6 |  |  | $ | 122.2 |  |  | $ | 116.2 |  |  | $ | 90.4 |  |  | $ | 43.0 |  |  | $ | 31.8 |  |  | $ | — |  |  | $ | — |
Long-Term Debt | 24,413.5 |  |  | 22,855.2 |  |  | 4,814.4 |  |  | 4,572.0 |  |  | 4,496.9 |  |  | 4,273.7 |  |  | 1,431.6 |  |  | 1,292.6 |
Rate Reduction Bonds | 410.5 |  |  | 395.0 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 410.5 |  |  | 395.0 |
As of December 31, 2022: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Not Subject to Mandatory Redemption | $ | 155.6 |  |  | $ | 136.7 |  |  | $ | 116.2 |  |  | $ | 99.2 |  |  | $ | 43.0 |  |  | $ | 37.5 |  |  | $ | — |  |  | $ | — |
Long-Term Debt | 21,044.1 |  |  | 18,891.3 |  |  | 4,216.5 |  |  | 3,828.3 |  |  | 4,425.1 |  |  | 4,091.8 |  |  | 1,164.6 |  |  | 970.5 |
Rate Reduction Bonds | 453.7 |  |  | 424.7 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 453.7 |  |  | 424.7 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-11 + Details
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