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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2024:        
Preferred Stock Not Subject to Mandatory Redemption
$155.6 $123.0 $116.2 $90.7 $43.0 $32.3 $— $— 
Long-Term Debt25,795.2 23,895.8 4,953.9 4,615.2 4,498.0 4,186.0 1,682.7 1,508.4 
Rate Reduction Bonds388.9 369.3 — — — — 388.9 369.3 
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