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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION (Tables)
 6 Months Ended
Jun. 30, 2023
Postemployment Benefits [Abstract]  
Components of Net Periodic Benefit Expense/(Income) Pension, SERP and PBOP expense reflected in the statements of cash flows for CL&P, NSTAR Electric and PSNH does not include intercompany allocations of net periodic benefit plan expense/(income), as these amounts are cash settled on a short-term basis.
 Pension and SERPPBOP
 For the Three Months Ended June 30, 2023For the Three Months Ended June 30, 2023
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
Service Cost$10.7 $3.1 $1.9 $1.1 $2.0 $0.3 $0.3 $0.2 
Interest Cost63.5 12.7 13.5 6.8 8.4 1.5 2.3 0.9 
Expected Return on Plan Assets(116.5)(23.7)(28.5)(12.5)(19.5)(2.3)(9.3)(1.4)
Actuarial Loss11.6 0.6 4.0 0.4 — — — — 
Prior Service Cost/(Credit)0.3 — 0.1 — (5.4)0.3 (4.3)0.1 
Settlement Loss3.7 — — — — — — — 
Total Net Periodic Benefit Plan Income$(26.7)$(7.3)$(9.0)$(4.2)$(14.5)$(0.2)$(11.0)$(0.2)
Intercompany Income AllocationsN/A(0.6)(0.4)(0.1)N/A(0.4)(0.5)(0.1)
Pension and SERPPBOP
For the Six Months Ended June 30, 2023For the Six Months Ended June 30, 2023
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$21.7 $6.1 $4.0 $2.2 $3.8 $0.6 $0.6 $0.4 
Interest Cost127.2 25.3 27.0 13.6 16.9 3.1 4.6 1.8 
Expected Return on Plan Assets(232.4)(47.1)(56.9)(24.8)(38.6)(4.7)(18.5)(2.8)
Actuarial Loss24.1 1.4 8.9 0.8 — — — — 
Prior Service Cost/(Credit)0.6 — 0.2 — (10.8)0.6 (8.5)0.2 
Settlement Loss3.7 — — — — — — — 
Total Net Periodic Benefit Plan Income$(55.1)$(14.3)$(16.8)$(8.2)$(28.7)$(0.4)$(21.8)$(0.4)
Intercompany Income AllocationsN/A(2.6)(2.1)(0.6)N/A(0.9)(1.1)(0.3)
Pension and SERPPBOP
For the Three Months Ended June 30, 2022For the Three Months Ended June 30, 2022
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$17.5 $4.7 $3.4 $1.7 $3.0 $0.5 $0.5 $0.3 
Interest Cost38.6 7.8 8.2 4.2 5.1 0.9 1.3 0.6 
Expected Return on Plan Assets(130.7)(26.5)(32.1)(14.0)(22.6)(2.8)(10.6)(1.7)
Actuarial Loss28.4 4.0 8.1 1.9 — — — — 
Prior Service Cost/(Credit)0.3 — 0.1 — (5.4)0.3 (4.2)0.1 
Total Net Periodic Benefit Plan Income$(45.9)$(10.0)$(12.3)$(6.2)$(19.9)$(1.1)$(13.0)$(0.7)
Intercompany Income AllocationsN/A$(4.1)$(3.2)$(0.9)N/A$(0.9)$(0.9)$(0.3)
Pension and SERPPBOP
For the Six Months Ended June 30, 2022For the Six Months Ended June 30, 2022
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$35.2 $9.2 $7.0 $3.5 $5.8 $1.0 $1.0 $0.5 
Interest Cost77.2 15.6 16.3 8.4 10.1 1.8 2.6 1.1 
Expected Return on Plan Assets(262.4)(53.1)(64.1)(28.1)(45.0)(5.6)(21.2)(3.3)
Actuarial Loss59.1 8.2 16.6 4.1 — — — — 
Prior Service Cost/(Credit)0.7 — 0.2 — (10.8)0.5 (8.5)0.2 
Total Net Periodic Benefit Plan Income$(90.2)$(20.1)$(24.0)$(12.1)$(39.9)$(2.3)$(26.1)$(1.5)
Intercompany Income AllocationsN/A$(7.9)$(6.1)$(1.7)N/A$(1.8)$(1.8)$(0.6)