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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION
 9 Months Ended
Sep. 30, 2023
Postemployment Benefits [Abstract]  
PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION
Eversource provides defined benefit retirement plans (Pension Plans) that cover eligible employees.  In addition to the Pension Plans, Eversource maintains non-qualified defined benefit retirement plans (SERP Plans), which provide benefits in excess of Internal Revenue Code limitations to eligible participants consisting of current and retired employees. Eversource also provides defined benefit postretirement plans (PBOP Plans) that provide life insurance and a health reimbursement arrangement created for the purpose of reimbursing retirees and dependents for health insurance premiums and certain medical expenses to eligible employees that meet certain age and service eligibility requirements.

The components of net periodic benefit plan expense/(income) for the Pension, SERP and PBOP Plans, prior to amounts capitalized as Property, Plant and Equipment or deferred as regulatory assets/(liabilities) for future recovery or refund, are shown below.  The service cost component of net periodic benefit plan expense/(income), less the capitalized portion, is included in Operations and Maintenance expense on the statements of income. The remaining components of net periodic benefit plan expense/(income), less the deferred portion, are included in Other Income, Net on the statements of 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)