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MARKETABLE SECURITIES (Tables)
 12 Months Ended
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,
 20212020
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$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 years60.5 61.4 
Six to ten years35.7 36.8 
Greater than ten years86.1 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,
20212020
Level 1:    
Mutual Funds and Equities$254.2 $246.0 
Money Market Funds31.3 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 Securities65.3 63.8 
Asset-Backed Debt Securities12.6 11.9 
Municipal Bonds12.3 24.0 
Other Fixed Income Securities16.6 10.4 
Total Level 2$188.1 $183.0 
Total Marketable Securities$473.6 $470.2