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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION (Tables)
 6 Months Ended
Jun. 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 June 30, 2022For the Three Months Ended June 30, 2022
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
Service Cost$17.5 $4.7 $3.4 $1.7 $3.0 $0.5 $0.5 $0.3 
Interest Cost38.6 7.8 8.2 4.2 5.1 0.9 1.3 0.6 
Expected Return on Plan Assets(130.7)(26.5)(32.1)(14.0)(22.6)(2.8)(10.6)(1.7)
Actuarial Losses, net28.4 4.0 8.1 1.9 — — — — 
Prior Service Cost/(Credit)0.3 — 0.1 — (5.4)0.3 (4.2)0.1 
Total Net Periodic Benefit Plan Income$(45.9)$(10.0)$(12.3)$(6.2)$(19.9)$(1.1)$(13.0)$(0.7)
Intercompany Income AllocationsN/A$(4.1)$(3.2)$(0.9)N/A$(0.9)$(0.9)$(0.3)
Pension and SERPPBOP
For the Six Months Ended June 30, 2022For the Six Months Ended June 30, 2022
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$35.2 $9.2 $7.0 $3.5 $5.8 $1.0 $1.0 $0.5 
Interest Cost77.2 15.6 16.3 8.4 10.1 1.8 2.6 1.1 
Expected Return on Plan Assets(262.4)(53.1)(64.1)(28.1)(45.0)(5.6)(21.2)(3.3)
Actuarial Losses, net59.1 8.2 16.6 4.1 — — — — 
Prior Service Cost/(Credit)0.7 — 0.2 — (10.8)0.5 (8.5)0.2 
Total Net Periodic Benefit Plan Income$(90.2)$(20.1)$(24.0)$(12.1)$(39.9)$(2.3)$(26.1)$(1.5)
Intercompany Income AllocationsN/A$(7.9)$(6.1)$(1.7)N/A$(1.8)$(1.8)$(0.6)
Pension and SERPPBOP
For the Three Months Ended June 30, 2021For the Three Months Ended June 30, 2021
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$18.4 $5.5 $3.9 $2.2 $3.3 $0.6 $0.6 $0.3 
Interest Cost27.1 6.7 6.7 3.6 4.2 0.8 1.1 0.4 
Expected Return on Plan Assets(87.4)(21.7)(27.1)(11.8)(19.8)(2.6)(9.2)(1.5)
Actuarial Loss47.8 10.8 15.3 5.2 1.3 0.4 0.5 0.1 
Prior Service Cost/(Credit)0.3 — 0.1 — (5.3)0.3 (4.2)0.1 
Total Net Periodic Benefit Plan Expense/(Income)$6.2 $1.3 $(1.1)$(0.8)$(16.3)$(0.5)$(11.2)$(0.6)
Intercompany Expense/(Income) AllocationsN/A$2.3 $2.5 $0.7 N/A$(0.6)$(0.6)$(0.2)
Pension and SERPPBOP
For the Six Months Ended June 30, 2021For the Six Months Ended June 30, 2021
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$39.7 $11.8 $7.9 $4.4 $6.8 $1.2 $1.2 $0.6 
Interest Cost59.7 14.0 13.4 7.2 8.6 1.6 2.2 0.9 
Expected Return on Plan Assets(196.3)(43.3)(54.0)(23.7)(39.5)(5.2)(18.5)(3.0)
Actuarial Loss109.4 23.8 30.8 10.1 3.9 0.8 1.1 0.3 
Prior Service Cost/(Credit)0.6 — 0.2 — (10.6)0.5 (8.4)0.2 
Total Net Periodic Benefit Plan Expense/(Income)$13.1 $6.3 $(1.7)$(2.0)$(30.8)$(1.1)$(22.4)$(1.0)
Intercompany Expense/(Income) AllocationsN/A$3.6 $4.0 $1.2 N/A$(0.9)$(1.0)$(0.3)