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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSIONS (Tables)
 9 Months Ended
Sep. 30, 2017
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 net periodic benefit expense and the intercompany allocations, less the capitalized portions of pension, SERP and PBOP amounts, are included in Operations and Maintenance expense 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, PSNH and WMECO does not include the intercompany allocations or the corresponding capitalized portion, as these amounts are cash settled on a short-term basis.
 
Pension and SERP
Eversource
For the Three Months Ended
 
For the Nine Months Ended
(Millions of Dollars)
September 30, 2017
 
September 30, 2016
 
September 30, 2017
 
September 30, 2016
Service Cost
$
17.4

 
$
18.6

 
$
53.8

 
$
56.6

Interest Cost
47.2

 
46.4

 
140.7

 
139.2

Expected Return on Pension Plan Assets
(83.5
)
 
(79.4
)
 
(250.5
)
 
(238.5
)
Actuarial Loss
33.9

 
31.4

 
101.3

 
94.2

Prior Service Cost
1.2

 
0.9

 
3.4

 
2.6

Total Net Periodic Benefit Expense
$
16.2

 
$
17.9

 
$
48.7

 
$
54.1

Capitalized Pension Expense
$
5.5

 
$
5.4

 
$
16.5

 
$
16.8

 
 
 
 
 
 
 
 
 
PBOP
Eversource
For the Three Months Ended
 
For the Nine Months Ended
(Millions of Dollars)
September 30, 2017
 
September 30, 2016
 
September 30, 2017
 
September 30, 2016
Service Cost
$
2.4

 
$
3.0

 
$
7.1

 
$
9.2

Interest Cost
6.8

 
7.5

 
20.3

 
26.5

Expected Return on Plan Assets
(16.0
)
 
(15.9
)
 
(47.8
)
 
(47.3
)
Actuarial Loss
2.2

 
3.0

 
6.9

 
5.0

Prior Service Credit
(5.3
)
 
(3.6
)
 
(16.1
)
 
(3.7
)
Total Net Periodic Benefit Income
$
(9.9
)
 
$
(6.0
)
 
$
(29.6
)
 
$
(10.3
)
Capitalized PBOP Income
$
(4.8
)
 
$
(2.6
)
 
$
(14.3
)
 
$
(4.6
)
 
Pension and SERP
 
For the Three Months Ended September 30, 2017
 
For the Three Months Ended September 30, 2016
(Millions of Dollars)
CL&P
 
NSTAR Electric
 
PSNH
 
WMECO
 
CL&P
 
NSTAR Electric
 
PSNH
 
WMECO
Service Cost
$
4.6

 
$
3.1

 
$
2.4

 
$
0.7

 
$
4.6

 
$
3.3

 
$
2.5

 
$
0.8

Interest Cost
10.5

 
8.6

 
5.3

 
2.1

 
10.2

 
8.5

 
5.1

 
2.1

Expected Return on Pension Plan Assets
(17.8
)
 
(17.5
)
 
(10.0
)
 
(4.4
)
 
(18.0
)
 
(16.9
)
 
(9.6
)
 
(4.4
)
Actuarial Loss
6.8

 
8.9

 
3.0

 
1.5

 
6.3

 
8.7

 
2.5

 
1.3

Prior Service Cost
0.4

 
0.1

 
0.1

 
0.1

 
0.4

 
—

 
0.1

 
0.1

Total Net Periodic Benefit Expense/(Income)
$
4.5

 
$
3.2

 
$
0.8

 
$
—

 
$
3.5

 
$
3.6

 
$
0.6

 
$
(0.1
)
Intercompany Allocations
$
2.4

 
$
1.8

 
$
0.8

 
$
0.5

 
$
3.5

 
$
2.2

 
$
1.0

 
$
0.6

Capitalized Pension Expense
$
2.4

 
$
1.9

 
$
0.4

 
$
0.1

 
$
2.2

 
$
2.0

 
$
0.4

 
$
0.1

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pension and SERP
 
For the Nine Months Ended September 30, 2017
 
For the Nine Months Ended September 30, 2016
(Millions of Dollars)
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
 
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
Service Cost
$
13.9

 
$
9.4

 
$
7.3

 
$
2.3

 
$
14.3

 
$
9.9

 
$
7.5

 
$
2.4

Interest Cost
31.3

 
25.6

 
15.9

 
6.3

 
31.2

 
25.3

 
15.4

 
6.3

Expected Return on Pension Plan Assets
(53.9
)
 
(52.5
)
 
(29.9
)
 
(13.3
)
 
(54.2
)
 
(50.7
)
 
(28.9
)
 
(13.1
)
Actuarial Loss
20.7

 
26.4

 
8.7

 
4.5

 
19.2

 
25.8

 
7.5

 
4.1

Prior Service Cost
1.1

 
0.2

 
0.4

 
0.2

 
1.1

 
—

 
0.3

 
0.2

Total Net Periodic Benefit Expense/(Income)
$
13.1

 
$
9.1

 
$
2.4

 
$
—

 
$
11.6

 
$
10.3

 
$
1.8

 
$
(0.1
)
Intercompany Allocations
$
7.4

 
$
5.5

 
$
2.5

 
$
1.4

 
$
10.3

 
$
6.7

 
$
3.0

 
$
1.9

Capitalized Pension Expense
$
7.3

 
$
5.4

 
$
1.1

 
$
0.3

 
$
7.1

 
$
5.7

 
$
1.0

 
$
0.3

 
PBOP
 
For the Three Months Ended September 30, 2017
 
For the Three Months Ended September 30, 2016
(Millions of Dollars)
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
 
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
Service Cost
$
0.5

 
$
0.3

 
$
0.3

 
$
0.1

 
$
0.6

 
$
0.6

 
$
0.4

 
$
0.1

Interest Cost
1.3

 
1.9

 
0.8

 
0.3

 
1.3

 
2.5

 
0.7

 
0.3

Expected Return on Plan Assets
(2.4
)
 
(6.6
)
 
(1.4
)
 
(0.6
)
 
(2.5
)
 
(6.4
)
 
(1.4
)
 
(0.6
)
Actuarial Loss
0.2

 
0.9

 
0.1

 
—

 
0.5

 
1.2

 
0.2

 
—

Prior Service Cost/(Credit)
0.3

 
(4.3
)
 
0.2

 
—

 
0.2

 
(2.9
)
 
0.1

 
—

Total Net Periodic Benefit (Income)/Expense
$
(0.1
)
 
$
(7.8
)
 
$
—

 
$
(0.2
)
 
$
0.1

 
$
(5.0
)
 
$
—

 
$
(0.2
)
Intercompany Allocations
$
(0.2
)
 
$
(0.2
)
 
$
(0.1
)
 
$
—

 
$
—

 
$
(0.1
)
 
$
—

 
$
—

Capitalized PBOP Income
$
(0.1
)
 
$
(4.0
)
 
$
—

 
$
(0.1
)
 
$
—

 
$
(2.2
)
 
$
—

 
$
(0.1
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
PBOP
 
For the Nine Months Ended September 30, 2017
 
For the Nine Months Ended September 30, 2016
(Millions of Dollars)
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
 
CL&P
 
NSTAR Electric
 
PSNH
 
WMECO
Service Cost
$
1.5

 
$
1.1

 
$
1.0

 
$
0.3

 
$
1.4

 
$
2.5

 
$
0.9

 
$
0.3

Interest Cost
4.0

 
5.7

 
2.3

 
0.8

 
4.0

 
10.3

 
2.2

 
0.8

Expected Return on Plan Assets
(7.3
)
 
(19.9
)
 
(4.1
)
 
(1.7
)
 
(7.6
)
 
(19.2
)
 
(4.2
)
 
(1.7
)
Actuarial Loss
0.7

 
2.6

 
0.4

 
—

 
0.9

 
1.7

 
0.5

 
—

Prior Service Cost/(Credit)
0.8

 
(12.9
)
 
0.4

 
0.1

 
0.2

 
(2.9
)
 
0.1

 
—

Total Net Periodic Benefit Income
$
(0.3
)
 
$
(23.4
)
 
$
—

 
$
(0.5
)
 
$
(1.1
)
 
$
(7.6
)
 
$
(0.5
)
 
$
(0.6
)
Intercompany Allocations
$
(0.5
)
 
$
(0.7
)
 
$
(0.3
)
 
$
(0.1
)
 
$
0.3

 
$
—

 
$
—

 
$
—

Capitalized PBOP Income
$
(0.4
)
 
$
(11.9
)
 
$
—

 
$
(0.2
)
 
$
(0.5
)
 
$
(3.3
)
 
$
—

 
$
(0.3
)