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MARKETABLE SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2022
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,
 20222021
Eversource
(Millions of Dollars)
Amortized
Cost		Pre-Tax
Unrealized
Gains		Pre-Tax
Unrealized
Losses		Fair ValueAmortized
Cost		Pre-Tax
Unrealized
Gains		Pre-Tax
Unrealized
Losses		Fair Value
Debt Securities$201.6 $0.1 $(16.2)$185.5 $214.5 $5.1 $(0.2)$219.4 
Investments Classified by Contractual Maturity Date
As of December 31, 2022, 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)
$28.5 $28.3 
One to five years43.8 42.4 
Six to ten years35.6 32.3 
Greater than ten years93.7 82.5 
Total Debt Securities$201.6 $185.5 

(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,
20222021
Level 1:    
Mutual Funds and Equities$190.1 $254.2 
Money Market Funds25.4 31.3 
Total Level 1$215.5 $285.5 
Level 2:  
U.S. Government Issued Debt Securities (Agency and Treasury)$82.3 $81.3 
Corporate Debt Securities46.1 65.3 
Asset-Backed Debt Securities8.6 12.6 
Municipal Bonds12.7 12.3 
Other Fixed Income Securities10.4 16.6 
Total Level 2$160.1 $188.1 
Total Marketable Securities$375.6 $473.6