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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION (Tables)
 6 Months Ended
Jun. 30, 2019
Postemployment Benefits [Abstract]  
Components of Net Periodic Benefit Expense/(Income)
The components of net periodic benefit 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 expense, less the capitalized portion, is included in Operations and Maintenance expense on the statements of income. The remaining components of net periodic benefit 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 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 June 30, 2019
 
For the Three Months Ended June 30, 2018
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
 
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
Service Cost
$
16.1

 
$
4.4

 
$
3.6

 
$
1.5

 
$
20.7

 
$
5.2

 
$
4.3

 
$
2.7

Interest Cost
54.8

 
11.4

 
12.3

 
6.0

 
49.1

 
10.5

 
10.9

 
5.5

Expected Return on Pension Plan Assets
(91.7
)
 
(18.1
)
 
(24.2
)
 
(10.1
)
 
(97.9
)
 
(19.4
)
 
(26.6
)
 
(10.8
)
Actuarial Loss
35.6

 
6.3

 
11.8

 
2.3

 
35.7

 
7.1

 
10.1

 
3.3

Prior Service Cost
0.3

 
—

 
—

 
—

 
2.1

 
0.2

 
0.1

 
0.1

Total Net Periodic Benefit Expense/(Income)
$
15.1

 
$
4.0

 
$
3.5

 
$
(0.3
)
 
$
9.7

 
$
3.6

 
$
(1.2
)
 
$
0.8

Intercompany Allocations
N/A

 
$
5.8

 
$
5.3

 
$
—

 
N/A

 
$
1.5

 
$
1.6

 
$
0.5

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pension and SERP
 
For the Six Months Ended June 30, 2019
 
For the Six Months Ended June 30, 2018
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
 
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
Service Cost
$
35.4

 
$
9.2

 
$
7.5

 
$
4.1

 
$
43.1

 
$
11.0

 
$
9.0

 
$
5.7

Interest Cost
109.1

 
23.0

 
24.2

 
12.2

 
97.8

 
20.9

 
21.7

 
10.9

Expected Return on Pension Plan Assets
(183.8
)
 
(36.9
)
 
(48.6
)
 
(20.4
)
 
(195.8
)
 
(40.2
)
 
(51.8
)
 
(21.8
)
Actuarial Loss
72.1

 
14.3

 
21.2

 
5.9

 
71.8

 
14.8

 
20.7

 
6.5

Prior Service Cost
0.6

 
—

 
0.1

 
—

 
4.1

 
0.6

 
0.1

 
0.2

Total Net Periodic Benefit Expense/(Income)
$
33.4

 
$
9.6

 
$
4.4

 
$
1.8

 
$
21.0

 
$
7.1

 
$
(0.3
)
 
$
1.5

Intercompany Allocations
N/A

 
$
13.6

 
$
8.4

 
$
2.5

 
N/A

 
$
3.0

 
$
3.2

 
$
1.0


 
PBOP
 
For the Three Months Ended June 30, 2019
 
For the Three Months Ended June 30, 2018
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR
Electric
 
PSNH
 
Eversource
 
CL&P
 
NSTAR
Electric
 
PSNH
Service Cost
$
1.8

 
$
0.3

 
$
0.4

 
$
0.1

 
$
2.5

 
$
0.4

 
$
0.5

 
$
0.3

Interest Cost
8.2

 
1.6

 
2.4

 
0.8

 
6.8

 
1.5

 
2.2

 
0.9

Expected Return on Plan Assets
(16.8
)
 
(2.3
)
 
(7.5
)
 
(1.3
)
 
(16.7
)
 
(2.6
)
 
(8.1
)
 
(1.5
)
Actuarial Loss
1.6

 
0.3

 
0.7

 
—

 
1.6

 
0.4

 
0.4

 
0.2

Prior Service Cost/(Credit)
(5.8
)
 
0.3

 
(4.2
)
 
0.1

 
(5.7
)
 
0.3

 
(4.3
)
 
0.1

Total Net Periodic Benefit Expense/(Income)
$
(11.0
)
 
$
0.2

 
$
(8.2
)
 
$
(0.3
)
 
$
(11.5
)
 
$
—

 
$
(9.3
)
 
$
—

Intercompany Allocations
N/A

 
$
(0.3
)
 
$
(0.4
)
 
$
(0.1
)
 
N/A

 
$
(0.2
)
 
$
(0.3
)
 
$
(0.1
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
PBOP
 
For the Six Months Ended June 30, 2019
 
For the Six Months Ended June 30, 2018
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR
Electric
 
PSNH
 
Eversource
 
CL&P
 
NSTAR
Electric
 
PSNH
Service Cost
$
3.9

 
$
0.7

 
$
0.9

 
$
0.4

 
$
5.0

 
$
0.9

 
$
1.0

 
$
0.6

Interest Cost
16.3

 
3.1

 
4.7

 
1.7

 
14.4

 
2.9

 
4.4

 
1.6

Expected Return on Plan Assets
(33.4
)
 
(4.5
)
 
(15.1
)
 
(2.8
)
 
(34.8
)
 
(5.2
)
 
(16.2
)
 
(3.0
)
Actuarial Loss
4.1

 
0.7

 
1.7

 
0.2

 
4.4

 
0.8

 
1.1

 
0.4

Prior Service Cost/(Credit)
(11.6
)
 
0.5

 
(8.5
)
 
0.2

 
(11.5
)
 
0.5

 
(8.5
)
 
0.3

Total Net Periodic Benefit Expense/(Income)
$
(20.7
)
 
$
0.5

 
$
(16.3
)
 
$
(0.3
)
 
$
(22.5
)
 
$
(0.1
)
 
$
(18.2
)
 
$
(0.1
)
Intercompany Allocations
N/A

 
$
(0.4
)
 
$
(0.6
)
 
$
(0.2
)
 
N/A

 
$
(0.5
)
 
$
(0.7
)
 
$
(0.2
)