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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
 3 Months Ended
Mar. 31, 2025
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, 2025:        
Preferred Stock Not Subject to Mandatory Redemption
$155.6 $124.8 $116.2 $92.0 $43.0 $32.8 $— $— 
Long-Term Debt27,599.0 26,038.9 5,508.1 5,168.9 5,887.2 5,617.4 1,732.4 1,551.6 
Rate Reduction Bonds345.7 336.7 — — — — 345.7 336.7 
As of December 31, 2024:        
Preferred Stock Not Subject to Mandatory Redemption
$155.6 $123.8 $116.2 $90.3 $43.0 $33.5 $— $— 
Long-Term Debt26,704.8 24,791.4 5,111.1 4,705.8 5,094.9 4,759.4 1,732.1 1,529.7 
Rate Reduction Bonds367.3 352.1 — — — — 367.3 352.1