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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION (Tables)
 9 Months Ended
Sep. 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 September 30, 2023For the Three Months Ended September 30, 2023
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
Service Cost$10.7 $3.1 $1.9 $1.0 $1.9 $0.4 $0.3 $0.2 
Interest Cost63.4 12.6 13.5 6.8 8.5 1.5 2.3 0.9 
Expected Return on Plan Assets(116.3)(23.5)(28.4)(12.3)(19.3)(2.3)(9.2)(1.4)
Actuarial Loss10.9 0.5 4.0 0.4 — — — — 
Prior Service Cost/(Credit)0.3 — 0.1 — (5.4)0.2 (4.2)0.1 
Settlement Loss8.7 — — — — — — — 
Total Net Periodic Benefit Plan Income$(22.3)$(7.3)$(8.9)$(4.1)$(14.3)$(0.2)$(10.8)$(0.2)
Intercompany Expense/(Income) AllocationsN/A$0.8 $0.9 $0.3 N/A$(0.5)$(0.5)$(0.2)
Pension and SERPPBOP
For the Nine Months Ended September 30, 2023For the Nine Months Ended September 30, 2023
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$32.4 $9.2 $5.9 $3.2 $5.7 $1.0 $0.9 $0.6 
Interest Cost190.6 37.9 40.5 20.4 25.4 4.6 6.9 2.7 
Expected Return on Plan Assets(348.7)(70.6)(85.3)(37.1)(57.9)(7.0)(27.7)(4.2)
Actuarial Loss35.0 1.9 12.9 1.2 — — — — 
Prior Service Cost/(Credit)0.9 — 0.3 — (16.2)0.8 (12.7)0.3 
Settlement Loss12.4 — — — — — — — 
Total Net Periodic Benefit Plan Income$(77.4)$(21.6)$(25.7)$(12.3)$(43.0)$(0.6)$(32.6)$(0.6)
Intercompany Income AllocationsN/A$(1.8)$(1.2)$(0.3)N/A$(1.4)$(1.6)$(0.5)
Pension and SERPPBOP
For the Three Months Ended September 30, 2022For the Three Months Ended September 30, 2022
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$17.5 $4.7 $3.4 $1.7 $2.9 $0.5 $0.5 $0.3 
Interest Cost38.6 7.8 8.2 4.2 5.0 0.9 1.3 0.5 
Expected Return on Plan Assets(130.7)(26.5)(32.1)(14.0)(22.5)(2.8)(10.6)(1.7)
Actuarial Loss28.4 4.0 8.1 1.9 — — — — 
Prior Service Cost/(Credit)0.4 — 0.1 — (5.4)0.3 (4.2)0.1 
Total Net Periodic Benefit Plan Income$(45.8)$(10.0)$(12.3)$(6.2)$(20.0)$(1.1)$(13.0)$(0.8)
Intercompany Income AllocationsN/A$(4.0)$(3.2)$(1.0)N/A$(0.9)$(0.9)$(0.3)
Pension and SERPPBOP
For the Nine Months Ended September 30, 2022For the Nine Months Ended September 30, 2022
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$52.7 $13.9 $10.4 $5.2 $8.7 $1.5 $1.5 $0.8 
Interest Cost115.8 23.4 24.5 12.6 15.1 2.7 3.9 1.6 
Expected Return on Plan Assets(393.1)(79.6)(96.2)(42.1)(67.5)(8.4)(31.8)(5.0)
Actuarial Loss87.5 12.2 24.7 6.0 — — — — 
Prior Service Cost/(Credit)1.1 — 0.3 — (16.2)0.8 (12.7)0.3 
Total Net Periodic Benefit Plan Income$(136.0)$(30.1)$(36.3)$(18.3)$(59.9)$(3.4)$(39.1)$(2.3)
Intercompany Income AllocationsN/A$(11.9)$(9.3)$(2.7)N/A$(2.7)$(2.7)$(0.9)