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MARKETABLE SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Summary of Available-for-Sale Debt Securities | The following is a summary of the available-for-sale debt securities:
| As of September 30, 2023 |  | As of December 31, 2022
Eversource (Millions of Dollars) | Amortized Cost |  | Pre-Tax Unrealized Gains |  | Pre-Tax Unrealized Losses |  | Fair Value |  | Amortized Cost |  | Pre-Tax Unrealized Gains |  | Pre-Tax Unrealized Losses |  | Fair Value
Debt Securities | $ | 173.0 |  |  | $ | 0.3 |  |  | $ | (11.0) |  |  | $ | 162.3 |  |  | $ | 201.6 |  |  | $ | 0.1 |  |  | $ | (16.2) |  |  | $ | 185.5 |
Contractual Maturities of Available-for-Sale Debt Securities | As of September 30, 2023, the contractual maturities of available-for-sale debt securities were as follows:
Eversource (Millions of Dollars) | Amortized Cost |  | Fair Value
Less than one year (1) | $ | 19.0 |  |  | $ | 19.4 |
One to five years | 29.9 |  |  | 29.2 |
Six to ten years | 41.7 |  |  | 39.9 |
Greater than ten years | 82.4 |  |  | 73.8 |
Total Debt Securities | $ | 173.0 |  |  | $ | 162.3 |
(1) Amounts in the Less than one year category include securities in the CYAPC and YAEC spent nuclear fuel trusts, which are restricted and are classified in long-term Marketable Securities on the balance sheets.
Marketable Securities Recorded at Fair Value on a Recurring Basis by Level | The following table presents the marketable securities recorded at fair value on a recurring basis by the level in which they are classified within the fair value hierarchy:
Eversource (Millions of Dollars) | As of September 30, 2023 |  | As of December 31, 2022
Level 1: |  |  |
Mutual Funds and Equities | $ | 168.3 |  |  | $ | 190.1 |
Money Market Funds | 16.2 |  |  | 25.4 |
Total Level 1 | $ | 184.5 |  |  | $ | 215.5 |
Level 2: |  |  |
U.S. Government Issued Debt Securities (Agency and Treasury) | $ | 86.1 |  |  | $ | 82.3 |
Corporate Debt Securities | 34.1 |  |  | 46.1 |
Asset-Backed Debt Securities | 5.9 |  |  | 8.6 |
Municipal Bonds | 9.3 |  |  | 12.7 |
Other Fixed Income Securities | 10.7 |  |  | 10.4 |
Total Level 2 | $ | 146.1 |  |  | $ | 160.1 |
Total Marketable Securities | $ | 330.6 |  |  | $ | 375.6 |

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