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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 6 Months Ended
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Jun. 30, 2022
Fair Value Disclosures [Abstract] |
Carrying Amounts and Estimated Fair Values of Financial Instruments | 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 June 30, 2022: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Not Subject to Mandatory Redemption | $ | 155.6 |  |  | $ | 146.9 |  |  | $ | 116.2 |  |  | $ | 107.2 |  |  | $ | 43.0 |  |  | $ | 39.7 |  |  | $ | — |  |  | $ | — |
Long-Term Debt | 20,849.2 |  |  | 19,531.4 |  |  | 4,215.9 |  |  | 4,053.3 |  |  | 4,429.7 |  |  | 4,295.6 |  |  | 1,164.2 |  |  | 1,027.2 |
Rate Reduction Bonds | 475.3 |  |  | 465.0 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 475.3 |  |  | 465.0 |
As of December 31, 2021: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Not Subject to Mandatory Redemption | $ | 155.6 |  |  | $ | 166.3 |  |  | $ | 116.2 |  |  | $ | 122.3 |  |  | $ | 43.0 |  |  | $ | 44.0 |  |  | $ | — |  |  | $ | — |
Long-Term Debt | 18,216.7 |  |  | 19,636.3 |  |  | 4,215.4 |  |  | 4,848.9 |  |  | 3,985.4 |  |  | 4,453.5 |  |  | 1,163.8 |  |  | 1,220.6 |
Rate Reduction Bonds | 496.9 |  |  | 543.3 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 496.9 |  |  | 543.3 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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