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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION (Tables)
 6 Months Ended
Jun. 30, 2024
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, 2024For the Three Months Ended June 30, 2024
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
Service Cost$11.2 $3.3 $1.9 $1.1 $1.8 $0.3 $0.3 $0.2 
Interest Cost62.7 12.7 12.8 6.7 8.0 1.4 2.2 0.8 
Expected Return on Plan Assets(115.7)(23.5)(28.0)(12.2)(20.3)(2.3)(9.9)(1.4)
Actuarial Loss/(Gain)22.1 3.2 6.4 1.3 (0.1)— — — 
Prior Service Cost/(Credit)0.3 — 0.1 — (5.4)0.2 (4.3)0.1 
Total Net Periodic Benefit Plan Income$(19.4)$(4.3)$(6.8)$(3.1)$(16.0)$(0.4)$(11.7)$(0.3)
Intercompany Income AllocationsN/A$(0.6)$(0.6)$(0.2)N/A$(0.5)$(0.6)$(0.2)
Pension and SERPPBOP
For the Six Months Ended June 30, 2024For the Six Months Ended June 30, 2024
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$22.0 $6.2 $4.0 $2.1 $3.5 $0.6 $0.6 $0.3 
Interest Cost124.7 25.1 25.9 13.4 16.0 2.8 4.4 1.7 
Expected Return on Plan Assets(231.3)(46.8)(56.3)(24.4)(40.7)(4.7)(19.8)(2.8)
Actuarial Loss/(Gain)41.9 5.7 12.8 2.4 (0.2)— — — 
Prior Service Cost/(Credit)0.6 — 0.2 — (10.8)0.5 (8.5)0.2 
Settlement Loss4.3 — — — — — — — 
Total Net Periodic Benefit Plan Income$(37.8)$(9.8)$(13.4)$(6.5)$(32.2)$(0.8)$(23.3)$(0.6)
Intercompany Income AllocationsN/A$(0.3)$(0.2)$(0.1)N/A$(1.1)$(1.3)$(0.4)
Pension and SERPPBOP
For the Three Months Ended June 30, 2023For the Three Months Ended June 30, 2023
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
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)