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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
 9 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Carrying Amounts and Estimated Fair Values of Financial Instruments Carrying amounts and estimated fair values are as follows:
 EversourceCL&PNSTAR ElectricPSNH
(Millions of Dollars)Carrying
Amount		Fair
Value		Carrying
Amount		Fair
Value		Carrying
Amount		Fair
Value		Carrying
Amount		Fair
Value
As of September 30, 2024:        
Preferred Stock Not Subject to Mandatory Redemption
$155.6 $131.5 $116.2 $96.9 $43.0 $34.6 $— $— 
Long-Term Debt27,413.9 26,518.4 5,250.6 5,099.2 5,093.7 4,968.0 1,731.8 1,623.6 
Rate Reduction Bonds367.3 360.1 — — — — 367.3 360.1 
As of December 31, 2023:        
Preferred Stock Not Subject to Mandatory Redemption
$155.6 $122.2 $116.2 $90.4 $43.0 $31.8 $— $— 
Long-Term Debt24,413.5 22,855.2 4,814.4 4,572.0 4,496.9 4,273.7 1,431.6 1,292.6 
Rate Reduction Bonds410.5 395.0 — — — — 410.5 395.0