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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 9 Months Ended
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Sep. 30, 2021
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 September 30, 2021: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Not Subject to Mandatory Redemption | $ | 155.6 |  |  | $ | 165.5 |  |  | $ | 116.2 |  |  | $ | 121.4 |  |  | $ | 43.0 |  |  | $ | 44.1 |  |  | $ | — |  |  | $ | — |
Long-Term Debt | 18,219.2 |  |  | 19,810.9 |  |  | 4,215.1 |  |  | 4,865.2 |  |  | 3,984.7 |  |  | 4,494.3 |  |  | 1,163.6 |  |  | 1,228.9 |
Rate Reduction Bonds | 496.9 |  |  | 555.8 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 496.9 |  |  | 555.8 |
As of December 31, 2020: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Not Subject to Mandatory Redemption | $ | 155.6 |  |  | $ | 169.1 |  |  | $ | 116.2 |  |  | $ | 123.4 |  |  | $ | 43.0 |  |  | $ | 45.7 |  |  | $ | — |  |  | $ | — |
Long-Term Debt | 16,179.1 |  |  | 18,420.1 |  |  | 3,914.8 |  |  | 4,800.9 |  |  | 3,643.2 |  |  | 4,294.0 |  |  | 1,099.1 |  |  | 1,207.0 |
Rate Reduction Bonds | 540.1 |  |  | 603.4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 540.1 |  |  | 603.4 |

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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 http://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 http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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