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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION (Tables)
 9 Months Ended
Sep. 30, 2022
Postemployment Benefits [Abstract]  
Components of Net Periodic Benefit Expense/(Income)
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/(income) 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, 2022For the Three Months Ended September 30, 2022
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
Service Cost$17.5 $4.7 $3.4 $1.7 $2.9 $0.5 $0.5 $0.3 
Interest Cost38.6 7.8 8.2 4.2 5.0 0.9 1.3 0.5 
Expected Return on Plan Assets(130.7)(26.5)(32.1)(14.0)(22.5)(2.8)(10.6)(1.7)
Actuarial Losses, net28.4 4.0 8.1 1.9 — — — — 
Prior Service Cost/(Credit)0.4 — 0.1 — (5.4)0.3 (4.2)0.1 
Total Net Periodic Benefit Plan Income$(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 $0.8 
Interest Cost115.8 23.4 24.5 12.6 15.1 2.7 3.9 1.6 
Expected Return on Plan Assets(393.1)(79.6)(96.2)(42.1)(67.5)(8.4)(31.8)(5.0)
Actuarial Losses, net87.5 12.2 24.7 6.0 — — — — 
Prior Service Cost/(Credit)1.1 — 0.3 — (16.2)0.8 (12.7)0.3 
Total Net Periodic Benefit Plan Income$(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)
Pension and SERPPBOP
For the Three Months Ended September 30, 2021For the Three Months Ended September 30, 2021
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
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)