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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION
 9 Months Ended
Sep. 30, 2021
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 for future recovery, 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, 2021For the Three Months Ended September 30, 2021
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
Service Cost$21.5 $5.6 $4.0 $2.2 $3.3 $0.5 $0.6 $0.3 
Interest Cost32.5 6.7 6.7 3.7 4.3 0.8 1.1 0.4 
Expected Return on Plan Assets(109.5)(21.7)(27.1)(11.9)(19.8)(2.5)(9.2)(1.6)
Actuarial Loss60.7 10.8 15.3 5.3 2.0 0.4 0.5 0.1 
Prior Service Cost/(Credit)0.3 — 0.1 — (5.3)0.3 (4.3)0.1 
Total Net Periodic Benefit Plan Expense/(Income)$5.5 $1.4 $(1.0)$(0.7)$(15.5)$(0.5)$(11.3)$(0.7)
Intercompany Expense/(Income) AllocationsN/A$2.2 $2.4 $0.7 N/A$(0.4)$(0.5)$(0.2)
Pension and SERPPBOP
For the Nine Months Ended September 30, 2021For the Nine Months Ended September 30, 2021
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$64.3 $17.4 $11.9 $6.6 $10.1 $1.7 $1.8 $0.9 
Interest Cost97.5 20.7 20.1 10.9 12.9 2.4 3.3 1.3 
Expected Return on Plan Assets(328.0)(65.0)(81.1)(35.6)(59.3)(7.7)(27.7)(4.6)
Actuarial Loss183.1 34.6 46.1 15.4 5.9 1.2 1.6 0.4 
Prior Service Cost/(Credit)1.1 — 0.3 — (15.9)0.8 (12.7)0.3 
Total Net Periodic Benefit Plan Expense/(Income)$18.0 $7.7 $(2.7)$(2.7)$(46.3)$(1.6)$(33.7)$(1.7)
Intercompany Expense/(Income) AllocationsN/A$5.8 $6.4 $1.9 N/A$(1.3)$(1.5)$(0.5)
Pension and SERPPBOP
For the Three Months Ended September 30, 2020For the Three Months Ended September 30, 2020
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$18.7 $5.4 $3.8 $2.0 $2.4 $0.4 $0.5 $0.2 
Interest Cost44.4 9.3 9.7 4.8 6.1 1.1 1.7 0.7 
Expected Return on Plan Assets(99.2)(19.8)(25.7)(11.1)(18.3)(2.5)(8.5)(1.4)
Actuarial Loss50.7 9.7 14.0 3.8 2.2 0.3 0.6 0.2 
Prior Service Cost/(Credit)0.2 — — — (5.3)0.3 (4.2)0.1 
Total Net Periodic Benefit Plan Expense/(Income)$14.8 $4.6 $1.8 $(0.5)$(12.9)$(0.4)$(9.9)$(0.2)
Intercompany Expense/(Income) AllocationsN/A$2.4 $2.3 $0.8 N/A$(0.3)$(0.4)$(0.1)
Pension and SERPPBOP
For the Nine Months Ended September 30, 2020For the Nine Months Ended September 30, 2020
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$57.0 $16.5 $11.4 $6.2 $7.3 $1.3 $1.6 $0.6 
Interest Cost133.0 28.1 29.0 14.5 18.3 3.3 5.0 2.1 
Expected Return on Plan Assets(298.8)(59.6)(77.2)(33.5)(55.1)(7.4)(25.5)(4.2)
Actuarial Loss150.7 29.4 41.3 11.8 6.3 0.9 1.8 0.6 
Prior Service Cost/(Credit)0.8 — 0.2 — (15.9)0.8 (12.7)0.3 
Total Net Periodic Benefit Plan Expense/(Income)$42.7 $14.4 $4.7 $(1.0)$(39.1)$(1.1)$(29.8)$(0.6)
Intercompany Expense/(Income) AllocationsN/A$6.7 $6.5 $2.2 N/A$(0.9)$(1.0)$(0.4)
Eversource Contributions: Eversource currently expects to make contributions of $180 million to the Pension Plans in 2021, of which $99 million and $30 million will be contributed by CL&P and NSTAR Electric, respectively.