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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
 12 Months Ended
Dec. 31, 2021
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, 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 
As of December 31, 2020:
Preferred Stock Not Subject to Mandatory Redemption$155.6 $169.1 $116.2 $123.4 $43.0 $45.7 $— $— 
Long-Term Debt16,179.1 18,420.1 3,914.8 4,800.9 3,643.2 4,294.0 1,099.1 1,207.0 
Rate Reduction Bonds540.1 603.4 — — — — 540.1 603.4