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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION (Tables)
 9 Months Ended
Sep. 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 September 30, 2024For the Three Months Ended September 30, 2024
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
Service Cost$11.2 $3.3 $1.9 $1.1 $1.7 $0.3 $0.3 $0.1 
Interest Cost62.7 12.6 12.8 6.7 8.0 1.4 2.2 0.9 
Expected Return on Plan Assets(115.7)(23.4)(28.0)(12.2)(20.3)(2.4)(9.9)(1.4)
Actuarial Loss/(Gain)22.0 3.2 6.4 1.3 (0.1)— — — 
Prior Service Cost/(Credit)0.3 — 0.1 — (5.4)0.3 (4.2)0.1 
Total Net Periodic Benefit Plan Income$(19.5)$(4.3)$(6.8)$(3.1)$(16.1)$(0.4)$(11.6)$(0.3)
Intercompany Income AllocationsN/A$(0.6)$(0.6)$(0.2)N/A$(0.6)$(0.6)$(0.2)
Pension and SERPPBOP
For the Nine Months Ended September 30, 2024For the Nine Months Ended September 30, 2024
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$33.2 $9.5 $5.9 $3.2 $5.2 $0.9 $0.9 $0.4 
Interest Cost187.4 37.7 38.7 20.1 24.0 4.2 6.6 2.6 
Expected Return on Plan Assets(347.0)(70.2)(84.3)(36.6)(61.0)(7.1)(29.7)(4.2)
Actuarial Loss/(Gain)63.9 8.9 19.2 3.7 (0.3)— — — 
Prior Service Cost/(Credit)0.9 — 0.3 — (16.2)0.8 (12.7)0.3 
Settlement Loss4.3 — — — — — — — 
Total Net Periodic Benefit Plan Income$(57.3)$(14.1)$(20.2)$(9.6)$(48.3)$(1.2)$(34.9)$(0.9)
Intercompany Income AllocationsN/A$(0.9)$(0.8)$(0.3)N/A$(1.7)$(1.9)$(0.6)
Pension and SERPPBOP
For the Three Months Ended September 30, 2023For the Three Months Ended September 30, 2023
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
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)