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MARKETABLE SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2023
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,
 20232022
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$169.5 $1.4 $(6.6)$164.3 $201.6 $0.1 $(16.2)$185.5 
Investments Classified by Contractual Maturity Date
As of December 31, 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$15.9 $15.9 
One to five years30.9 30.9 
Six to ten years38.1 37.8 
Greater than ten years84.6 79.7 
Total Debt Securities$169.5 $164.3 
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,
20232022
Level 1:    
Mutual Funds and Equities$176.9 $190.1 
Money Market Funds13.7 25.4 
Total Level 1$190.6 $215.5 
Level 2:  
U.S. Government Issued Debt Securities (Agency and Treasury)$90.1 $82.3 
Corporate Debt Securities34.0 46.1 
Asset-Backed Debt Securities5.6 8.6 
Municipal Bonds9.8 12.7 
Other Fixed Income Securities11.1 10.4 
Total Level 2$150.6 $160.1 
Total Marketable Securities$341.2 $375.6