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MARKETABLE SECURITIES (Tables) | 6 Months Ended
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Jun. 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 June 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 | $ | 203.6 |  |  | $ | 0.1 |  |  | $ | (10.9) |  |  | $ | 192.8 |  |  | $ | 201.6 |  |  | $ | 0.1 |  |  | $ | (16.2) |  |  | $ | 185.5 |
Contractual Maturities of Available-for-Sale Debt Securities | As of June 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) | $ | 46.6 |  |  | $ | 46.6 |
One to five years | 31.5 |  |  | 30.6 |
Six to ten years | 39.3 |  |  | 37.4 |
Greater than ten years | 86.2 |  |  | 78.2 |
Total Debt Securities | $ | 203.6 |  |  | $ | 192.8 |
(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. Amounts also include securities in Eversource’s non-qualified executive benefit trust, which are intended to be sold in 2023.
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 June 30, 2023 |  | As of December 31, 2022
Level 1: |  |  |
Mutual Funds and Equities | $ | 164.7 |  |  | $ | 190.1 |
Money Market Funds | 42.6 |  |  | 25.4 |
Total Level 1 | $ | 207.3 |  |  | $ | 215.5 |
Level 2: |  |  |
U.S. Government Issued Debt Securities (Agency and Treasury) | $ | 81.9 |  |  | $ | 82.3 |
Corporate Debt Securities | 41.5 |  |  | 46.1 |
Asset-Backed Debt Securities | 6.4 |  |  | 8.6 |
Municipal Bonds | 9.7 |  |  | 12.7 |
Other Fixed Income Securities | 10.7 |  |  | 10.4 |
Total Level 2 | $ | 150.2 |  |  | $ | 160.1 |
Total Marketable Securities | $ | 357.5 |  |  | $ | 375.6 |

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