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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION (Tables)
 6 Months Ended
Jun. 30, 2021
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 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 June 30, 2021For the Three Months Ended June 30, 2021
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
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)
Pension and SERPPBOP
For the Three Months Ended June 30, 2020For the Three Months Ended June 30, 2020
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$18.7 $5.4 $3.8 $2.0 $2.0 $0.4 $0.5 $0.2 
Interest Cost44.3 9.3 9.7 4.8 6.4 1.0 1.6 0.8 
Expected Return on Plan Assets(99.3)(19.8)(25.7)(11.1)(18.7)(2.5)(8.5)(1.4)
Actuarial Loss50.7 9.7 14.0 3.9 2.0 0.2 0.5 0.3 
Prior Service Cost/(Credit)0.3 — 0.1 — (5.2)0.2 (4.3)0.1 
Total Net Periodic Benefit Plan Expense/(Income)$14.7 $4.6 $1.9 $(0.4)$(13.5)$(0.7)$(10.2)$— 
Intercompany Expense/(Income) AllocationsN/A$2.4 $2.3 $0.8 N/A$(0.2)$(0.2)$(0.1)
Pension and SERPPBOP
For the Six Months Ended June 30, 2020For the Six Months Ended June 30, 2020
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$38.3 $11.1 $7.6 $4.2 $4.9 $0.9 $1.1 $0.4 
Interest Cost88.6 18.8 19.3 9.7 12.2 2.2 3.3 1.4 
Expected Return on Plan Assets(199.6)(39.8)(51.5)(22.4)(36.8)(4.9)(17.0)(2.8)
Actuarial Loss100.0 19.7 27.3 8.0 4.1 0.6 1.2 0.4 
Prior Service Cost/(Credit)0.6 — 0.2 — (10.6)0.4 (8.5)0.2 
Total Net Periodic Benefit Plan Expense/(Income)$27.9 $9.8 $2.9 $(0.5)$(26.2)$(0.8)$(19.9)$(0.4)
Intercompany Expense/(Income) AllocationsN/A$4.3 $4.2 $1.4 N/A$(0.6)$(0.6)$(0.3)