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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION (Tables)
 9 Months Ended
Sep. 30, 2018
Postemployment Benefits [Abstract]  
Schedule of Net Benefit Costs
The components of net periodic benefit expense for the Pension, SERP and PBOP Plans are shown below.  The service cost component of net periodic benefit expense and the intercompany allocations, less the capitalized portions, are included in Operations and Maintenance expense on the statements of income.  The remaining components of net periodic benefit costs for pension, SERP and PBOP are included in Other Income, Net on the statements of income. Capitalized amounts relate to employees working on capital projects and are included in Property, Plant and Equipment, Net on the balance sheets.  Pension, SERP and PBOP expense reflected in the statements of cash flows for CL&P, NSTAR Electric and PSNH does not include the intercompany allocations or the corresponding capitalized and deferred portion, as these amounts are cash settled on a short-term basis.
 
Pension and SERP
 
For the Three Months Ended September 30, 2018
 
For the Three Months Ended September 30, 2017
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
 
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
Service Cost
$
20.9

 
$
5.2

 
$
4.3

 
$
2.7

 
$
17.4

 
$
4.6

 
$
3.8

 
$
2.4

Interest Cost
49.2

 
10.5

 
10.9

 
5.5

 
47.2

 
10.5

 
10.7

 
5.3

Expected Return on Plan Assets
(97.8
)
 
(19.4
)
 
(26.6
)
 
(10.8
)
 
(83.5
)
 
(17.8
)
 
(21.9
)
 
(10.0
)
Actuarial Loss
35.7

 
7.1

 
10.1

 
3.3

 
33.9

 
6.8

 
10.4

 
3.0

Prior Service Cost
2.0

 
0.2

 
0.1

 
0.1

 
1.2

 
0.4

 
0.2

 
0.1

Total Net Periodic Benefit Expense/(Income)
$
10.0

 
$
3.6

 
$
(1.2
)
 
$
0.8

 
$
16.2

 
$
4.5

 
$
3.2

 
$
0.8

Intercompany Allocations
N/A

 
$
1.5

 
$
1.6

 
$
0.5

 
N/A

 
$
2.4

 
$
2.3

 
$
0.8

Capitalized Pension Expense
$
6.6

 
$
2.0

 
$
1.8

 
$
0.8

 
$
5.5

 
$
2.4

 
$
2.0

 
$
0.4

 
Pension and SERP
 
For the Nine Months Ended September 30, 2018
 
For the Nine Months Ended September 30, 2017
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
 
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
Service Cost
$
64.2

 
$
16.2

 
$
13.1

 
$
8.4

 
$
53.8

 
$
13.9

 
$
11.7

 
$
7.3

Interest Cost
147.1

 
31.4

 
32.6

 
16.4

 
140.7

 
31.3

 
31.9

 
15.9

Expected Return on Plan Assets
(293.8
)
 
(59.7
)
 
(78.3
)
 
(32.6
)
 
(250.5
)
 
(53.9
)
 
(65.8
)
 
(29.9
)
Actuarial Loss
107.6

 
21.9

 
31.0

 
9.8

 
101.3

 
20.7

 
30.9

 
8.7

Prior Service Cost
6.0

 
0.8

 
0.2

 
0.2

 
3.4

 
1.1

 
0.4

 
0.4

Total Net Periodic Benefit Expense/(Income)
$
31.1

 
$
10.6

 
$
(1.4
)
 
$
2.2

 
$
48.7

 
$
13.1

 
$
9.1

 
$
2.4

Intercompany Allocations
N/A

 
$
4.5

 
$
4.8

 
$
1.4

 
N/A

 
$
7.4

 
$
6.9

 
$
2.5

Capitalized Pension Expense
$
20.2

 
$
6.2

 
$
5.8

 
$
2.3

 
$
16.5

 
$
7.3

 
$
5.7

 
$
1.1

 
PBOP
 
For the Three Months Ended September 30, 2018
 
For the Three Months Ended September 30, 2017
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR
Electric
 
PSNH
 
Eversource
 
CL&P
 
NSTAR
Electric
 
PSNH
Service Cost
$
2.5

 
$
0.4

 
$
0.5

 
$
0.3

 
$
2.4

 
$
0.5

 
$
0.4

 
$
0.3

Interest Cost
7.7

 
1.5

 
2.2

 
0.9

 
6.8

 
1.3

 
2.2

 
0.8

Expected Return on Plan Assets
(18.2
)
 
(2.6
)
 
(8.1
)
 
(1.5
)
 
(16.0
)
 
(2.4
)
 
(7.2
)
 
(1.4
)
Actuarial Loss
2.6

 
0.4

 
0.5

 
0.2

 
2.2

 
0.2

 
0.9

 
0.1

Prior Service Cost/(Credit)
(6.0
)
 
0.3

 
(4.3
)
 
0.1

 
(5.3
)
 
0.3

 
(4.3
)
 
0.2

Total Net Periodic Benefit Income
$
(11.4
)
 
$
—

 
$
(9.2
)
 
$
—

 
$
(9.9
)
 
$
(0.1
)
 
$
(8.0
)
 
$
—

Intercompany Allocations
N/A

 
$
(0.3
)
 
$
(0.3
)
 
$
(0.1
)
 
N/A

 
$
(0.2
)
 
$
(0.2
)
 
$
(0.1
)
Capitalized PBOP Expense/(Income)
$
0.7

 
$
0.1

 
$
0.2

 
$
0.1

 
$
(4.8
)
 
$
(0.1
)
 
$
(4.1
)
 
$
—

 
PBOP
 
For the Nine Months Ended September 30, 2018
 
For the Nine Months Ended September 30, 2017
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR
Electric
 
PSNH
 
Eversource
 
CL&P
 
NSTAR
Electric
 
PSNH
Service Cost
$
7.5

 
$
1.4

 
$
1.6

 
$
0.9

 
$
7.1

 
$
1.5

 
$
1.4

 
$
1.0

Interest Cost
23.0

 
4.4

 
6.5

 
2.5

 
20.3

 
4.0

 
6.5

 
2.3

Expected Return on Plan Assets
(54.2
)
 
(7.8
)
 
(24.4
)
 
(4.5
)
 
(47.8
)
 
(7.3
)
 
(21.6
)
 
(4.1
)
Actuarial Loss
7.7

 
1.2

 
1.7

 
0.6

 
6.9

 
0.7

 
2.6

 
0.4

Prior Service Cost/(Credit)
(17.6
)
 
0.8

 
(12.7
)
 
0.4

 
(16.1
)
 
0.8

 
(12.8
)
 
0.4

Total Net Periodic Benefit Income
$
(33.6
)
 
$
—

 
$
(27.3
)
 
$
(0.1
)
 
$
(29.6
)
 
$
(0.3
)
 
$
(23.9
)
 
$
—

Intercompany Allocations
N/A

 
$
(0.8
)
 
$
(1.0
)
 
$
(0.3
)
 
N/A

 
$
(0.5
)
 
$
(0.8
)
 
$
(0.3
)
Capitalized PBOP Expense/(Income)
$
2.3

 
$
0.5

 
$
0.7

 
$
0.3

 
$
(14.3
)
 
$
(0.4
)
 
$
(12.1
)
 
$
—