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MARKETABLE SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation | The following is a summary of the available-for-sale debt securities:
| As of December 31,
| 2021 |  | 2020
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 | $ | 214.5 |  |  | $ | 5.1 |  |  | $ | (0.2) |  |  | $ | 219.4 |  |  | $ | 213.1 |  |  | $ | 11.2 |  |  | $ | (0.1) |  |  | $ | 224.2 |
Investments Classified by Contractual Maturity Date | As of December 31, 2021, 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) | $ | 32.2 |  |  | $ | 32.2 |
One to five years | 60.5 |  |  | 61.4 |
Six to ten years | 35.7 |  |  | 36.8 |
Greater than ten years | 86.1 |  |  | 89.0 |
Total Debt Securities | $ | 214.5 |  |  | $ | 219.4 |
(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 | 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 December 31,
2021 |  | 2020
Level 1: |  |  |
Mutual Funds and Equities | $ | 254.2 |  |  | $ | 246.0 |
Money Market Funds | 31.3 |  |  | 41.2 |
Total Level 1 | $ | 285.5 |  |  | $ | 287.2 |
Level 2: |  |  |
U.S. Government Issued Debt Securities (Agency and Treasury) | $ | 81.3 |  |  | $ | 72.9 |
Corporate Debt Securities | 65.3 |  |  | 63.8 |
Asset-Backed Debt Securities | 12.6 |  |  | 11.9 |
Municipal Bonds | 12.3 |  |  | 24.0 |
Other Fixed Income Securities | 16.6 |  |  | 10.4 |
Total Level 2 | $ | 188.1 |  |  | $ | 183.0 |
Total Marketable Securities | $ | 473.6 |  |  | $ | 470.2 |

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