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SEGMENT INFORMATION (Tables)
 3 Months Ended
Mar. 31, 2018
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
Eversource's segment information is as follows:
 
For the Three Months Ended March 31, 2018 (1)
Eversource
(Millions of Dollars)
Electric Distribution
 
Natural Gas Distribution
 
Electric Transmission
 
Water Distribution
 
Other
 
Eliminations
 
Total
Operating Revenues
$
1,754.6

 
$
424.9

 
$
305.0

 
$
44.6

 
$
230.9

 
$
(472.0
)
 
$
2,288.0

Depreciation and Amortization
(144.4
)
 
(26.4
)
 
(56.6
)
 
(10.7
)
 
(12.0
)
 
0.6

 
(249.5
)
Other Operating Expenses
(1,443.5
)
 
(312.6
)
 
(83.2
)
 
(23.9
)
 
(204.7
)
 
471.9

 
(1,596.0
)
Operating Income
$
166.7

 
$
85.9

 
$
165.2

 
$
10.0

 
$
14.2

 
$
0.5

 
$
442.5

Interest Expense
$
(47.4
)
 
$
(11.1
)
 
$
(29.7
)
 
$
(8.4
)
 
$
(31.9
)
 
$
7.4

 
$
(121.1
)
Other Income, Net
19.6

 
2.0

 
8.0

 
(0.6
)
 
360.1

 
(355.3
)
 
33.8

Net Income Attributable to Common Shareholders
104.2

 
57.8

 
107.4

 
1.5

 
346.0

 
(347.4
)
 
269.5

Cash Flows Used for Investments in Plant
236.0

 
70.4

 
239.2

 
19.0

 
42.7

 
—

 
607.3

 
For the Three Months Ended March 31, 2017
Eversource
(Millions of Dollars)
Electric
Distribution
 
Natural Gas
Distribution
 
Electric
Transmission
 
Water Distribution
 
Other
 
Eliminations
 
Total
Operating Revenues
$
1,401.1

 
$
403.6

 
$
316.9

 
$
—

 
$
236.3

 
$
(252.8
)
 
$
2,105.1

Depreciation and Amortization
(129.8
)
 
(21.7
)
 
(50.6
)
 
—

 
(9.2
)
 
0.5

 
(210.8
)
Other Operating Expenses
(1,048.9
)
 
(290.2
)
 
(90.2
)
 
—

 
(216.8
)
 
252.8

 
(1,393.3
)
Operating Income
$
222.4

 
$
91.7

 
$
176.1

 
$
—

 
$
10.3

 
$
0.5

 
$
501.0

Interest Expense
$
(48.2
)
 
$
(10.6
)
 
$
(28.1
)
 
$
—

 
$
(19.7
)
 
$
3.2

 
$
(103.4
)
Other Income, Net
12.0

 
0.9

 
5.1

 
—

 
329.1

 
(325.5
)
 
21.6

Net Income Attributable to Common Shareholders
114.1

 
50.8

 
94.2

 
—

 
322.2

 
(321.8
)
 
259.5

Cash Flows Used for Investments in Plant
236.2

 
64.5

 
192.6

 
—

 
30.3

 
—

 
523.6


(1)
Effective January 1, 2018, upon implementation of the new revenue accounting guidance, the electric distribution segment is presented gross and intercompany transmission billings are presented in the eliminations column, as Eversource believes that the electric distribution segment acts as a principal, rather than an agent, in its contracts with retail customers. Retail customers contract directly with the electric distribution utility and do not differentiate between distribution and transmission services. Therefore, the electric distribution segment revenues, which are derived from retail customer billings, are presented gross of the eliminations. Prior to 2018, the electric distribution segment presented intercompany electric transmission billings net, based on indicators of net presentation prior to the new revenue guidance.  See Note 15, "Revenues," regarding accounting for revenues.

The following table summarizes Eversource's segmented total assets:
Eversource
(Millions of Dollars)
Electric
Distribution
 
Natural Gas
Distribution
 
Electric
Transmission
 
Water Distribution
 
Other
 
Eliminations
 
Total
As of March 31, 2018
$
21,167.9

 
$
3,636.8

 
$
9,833.2

 
$
2,487.9

 
$
16,586.5

 
$
(16,672.3
)
 
$
37,040.0

As of December 31, 2017
19,250.4

 
3,595.2

 
9,401.2

 
2,470.0

 
15,933.8

 
(14,430.2
)
 
36,220.4