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SEGMENT INFORMATION (Tables)
 9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
Eversource's segment information is as follows:
 
For the Three Months Ended September 30, 2017
Eversource
(Millions of Dollars)
Electric
Distribution
 
Natural Gas
Distribution
 
Electric
Transmission
 
Other
 
Eliminations
 
Total
Operating Revenues
$
1,547.1

 
$
109.2

 
$
328.5

 
$
224.2

 
$
(220.5
)
 
$
1,988.5

Depreciation and Amortization
(159.6
)
 
(15.2
)
 
(52.6
)
 
(9.5
)
 
0.6

 
(236.3
)
Other Operating Expenses
(1,088.7
)
 
(95.5
)
 
(95.5
)
 
(190.0
)
 
220.1

 
(1,249.6
)
Operating Income/(Loss)
$
298.8

 
$
(1.5
)
 
$
180.4

 
$
24.7

 
$
0.2

 
$
502.6

Interest Expense
$
(51.3
)
 
$
(10.8
)
 
$
(29.2
)
 
$
(21.8
)
 
$
4.4

 
$
(108.7
)
Other Income, Net
7.7

 
0.3

 
8.5

 
267.5

 
(262.8
)
 
21.2

Net Income/(Loss) Attributable to
  Common Shareholders
157.4

 
(6.2
)
 
99.0

 
268.4

 
(258.2
)
 
260.4

 
 
 
 
 
 
 
 
 
 
 
 
 
For the Nine Months Ended September 30, 2017
Eversource
(Millions of Dollars)
Electric Distribution
 
Natural Gas Distribution
 
Electric Transmission
 
Other
 
Eliminations
 
Total
Operating Revenues
$
4,224.2

 
$
698.8

 
$
970.0

 
$
677.5

 
$
(714.0
)
 
$
5,856.5

Depreciation and Amortization
(394.9
)
 
(54.8
)
 
(154.5
)
 
(26.7
)
 
1.7

 
(629.2
)
Other Operating Expenses
(3,056.0
)
 
(535.2
)
 
(280.4
)
 
(602.4
)
 
714.0

 
(3,760.0
)
Operating Income
$
773.3

 
$
108.8

 
$
535.1

 
$
48.4

 
$
1.7

 
$
1,467.3

Interest Expense
$
(149.0
)
 
$
(32.3
)
 
$
(86.1
)
 
$
(63.1
)
 
$
11.0

 
$
(319.5
)
Other Income, Net
15.2

 
0.8

 
20.1

 
853.9

 
(833.7
)
 
56.3

Net Income Attributable to Common Shareholders
393.4

 
49.1

 
289.6

 
839.5

 
(821.0
)
 
750.6

Cash Flows Used for Investments in Plant
752.4

 
209.8

 
575.6

 
104.5

 
—

 
1,642.3

 
For the Three Months Ended September 30, 2016
Eversource
(Millions of Dollars)
Electric
Distribution
 
Natural Gas
Distribution
 
Electric
Transmission
 
Other
 
Eliminations
 
Total
Operating Revenues
$
1,623.4

 
$
99.2

 
$
306.8

 
$
211.5

 
$
(201.2
)
 
$
2,039.7

Depreciation and Amortization
(154.8
)
 
(15.2
)
 
(47.1
)
 
(8.6
)
 
0.5

 
(225.2
)
Other Operating Expenses
(1,146.8
)
 
(87.8
)
 
(90.2
)
 
(179.3
)
 
199.5

 
(1,304.6
)
Operating Income/(Loss)
$
321.8

 
$
(3.8
)
 
$
169.5

 
$
23.6

 
$
(1.2
)
 
$
509.9

Interest Expense
$
(49.0
)
 
$
(10.2
)
 
$
(26.9
)
 
$
(15.1
)
 
$
1.3

 
$
(99.9
)
Other Income, Net
5.3

 
0.6

 
6.3

 
256.9

 
(255.5
)
 
13.6

Net Income/(Loss) Attributable to
  Common Shareholders
170.1

 
(7.0
)
 
88.4

 
268.5

 
(254.7
)
 
265.3

 
 
 
 
 
 
 
 
 
 
 
 
 
For the Nine Months Ended September 30, 2016
Eversource
(Millions of Dollars)
Electric
Distribution
 
Natural Gas
Distribution
 
Electric
Transmission
 
Other
 
Eliminations
 
Total
Operating Revenues
$
4,362.6

 
$
622.3

 
$
892.5

 
$
636.8

 
$
(651.7
)
 
$
5,862.5

Depreciation and Amortization
(380.9
)
 
(47.9
)
 
(137.7
)
 
(23.1
)
 
1.6

 
(588.0
)
Other Operating Expenses
(3,230.1
)
 
(462.4
)
 
(245.7
)
 
(564.7
)
 
650.2

 
(3,852.7
)
Operating Income
$
751.6

 
$
112.0

 
$
509.1

 
$
49.0

 
$
0.1

 
$
1,421.8

Interest Expense
$
(144.6
)
 
$
(30.8
)
 
$
(82.2
)
 
$
(45.8
)
 
$
4.8

 
$
(298.6
)
Other Income, Net
11.6

 
0.5

 
14.2

 
781.4

 
(784.0
)
 
23.7

Net Income Attributable to Common Shareholders
381.3

 
51.9

 
266.6

 
791.7

 
(778.4
)
 
713.1

Cash Flows Used for Investments in Plant
570.9

 
170.3

 
536.2

 
81.8

 
—

 
1,359.2


The following table summarizes Eversource's segmented total assets:
Eversource
(Millions of Dollars)
Electric
Distribution
 
Natural Gas
Distribution
 
Electric
Transmission
 
Other
 
Eliminations
 
Total
As of September 30, 2017
$
18,826.0

 
$
3,432.6

 
$
9,290.3

 
$
14,939.4

 
$
(13,324.7
)
 
$
33,163.6

As of December 31, 2016
18,367.5

 
3,303.8

 
8,751.5

 
14,493.1

 
(12,862.7
)
 
32,053.2