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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
 12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Carrying Amounts and Estimated Fair Values of Financial Instruments The fair values provided in the table below are classified as Level 2 within the fair value hierarchy.  Carrying amounts and estimated fair values are as follows:
 EversourceCL&PNSTAR ElectricPSNH
(Millions of Dollars)Carrying AmountFair ValueCarrying
Amount		Fair
Value		Carrying
Amount		Fair
Value		Carrying
Amount		Fair
Value
As of December 31, 2022:
Preferred Stock Not Subject to Mandatory Redemption$155.6 $136.7 $116.2 $99.2 $43.0 $37.5 $— $— 
Long-Term Debt21,044.1 18,891.3 4,216.5 3,828.3 4,425.1 4,091.8 1,164.6 970.5 
Rate Reduction Bonds453.7 424.7 — — — — 453.7 424.7 
As of December 31, 2021:
Preferred Stock Not Subject to Mandatory Redemption$155.6 $166.3 $116.2 $122.3 $43.0 $44.0 $— $— 
Long-Term Debt18,216.7 19,636.3 4,215.4 4,848.9 3,985.4 4,453.5 1,163.8 1,220.6 
Rate Reduction Bonds496.9 543.3 — — — — 496.9 543.3