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SEGMENT INFORMATION (Tables)
 9 Months Ended
Sep. 30, 2021
Segment Reporting [Abstract]  
Summary of Segment Information and Segmented Total Assets
Eversource's segment information is as follows:
For the Three Months Ended September 30, 2021
Eversource
(Millions of Dollars)
Electric
Distribution		Natural Gas
Distribution		Electric
Transmission		Water DistributionOtherEliminationsTotal
Operating Revenues$2,055.2 $185.5 $418.3 $61.8 $326.1 $(614.1)$2,432.8 
Depreciation and Amortization(179.8)(28.5)(75.4)(11.5)(28.0)1.1 (322.1)
Other Operating Expenses(1,640.5)(176.9)(122.4)(26.1)(275.2)613.7 (1,627.4)
Operating Income/(Loss)$234.9 $(19.9)$220.5 $24.2 $22.9 $0.7 $483.3 
Interest Expense$(61.0)$(15.7)$(33.5)$(8.0)$(42.5)$12.7 $(148.0)
Other Income, Net25.4 6.7 5.0 1.2 325.9 (320.4)43.8 
Net Income/(Loss) Attributable to Common
   Shareholders		150.4 (22.0)139.4 17.5 304.9 (307.0)283.2 
For the Nine Months Ended September 30, 2021
Eversource
(Millions of Dollars)
Electric DistributionNatural Gas DistributionElectric TransmissionWater DistributionOtherEliminationsTotal
Operating Revenues$5,632.1 $1,277.8 $1,230.1 $161.0 $999.1 $(1,918.9)$7,381.2 
Depreciation and Amortization(534.1)(108.7)(223.4)(34.3)(83.7)3.1 (981.1)
Other Operating Expenses(4,531.3)(970.6)(359.6)(76.7)(860.3)1,918.9 (4,879.6)
Operating Income$566.7 $198.5 $647.1 $50.0 $55.1 $3.1 $1,520.5 
Interest Expense$(175.4)$(44.2)$(98.7)$(24.0)$(125.9)$37.0 $(431.2)
Other Income, Net76.0 15.2 17.3 3.1 1,059.2 (1,046.2)124.6 
Net Income Attributable to Common Shareholders365.4 129.6 412.4 30.0 982.5 (1,006.1)913.8 
Cash Flows Used for Investments in Plant764.9 506.4 691.0 91.2 157.6 — 2,211.1 
For the Three Months Ended September 30, 2020
Eversource
(Millions of Dollars)
Electric
Distribution
Natural Gas
Distribution (1)
Electric
Transmission		Water Distribution
Other (1)
Eliminations (1)
Total
Operating Revenues$2,060.3 $110.2 $389.3 $64.1 $322.3 $(602.6)$2,343.6 
Depreciation and Amortization(182.0)(14.8)(70.6)(10.8)(24.1)0.3 (302.0)
Other Operating Expenses(1,577.0)(104.2)(120.6)(10.2)(271.5)603.1 (1,480.4)
Operating Income/(Loss)$301.3 $(8.8)$198.1 $43.1 $26.7 $0.8 $561.2 
Interest Expense$(53.3)$(10.1)$(31.1)$(8.0)$(38.7)$7.1 $(134.1)
Other Income, Net16.0 0.7 6.9 1.6 401.0 (397.0)29.2 
Net Income/(Loss) Attributable to Common
   Shareholders		205.5 (15.4)125.6 23.1 396.6 (389.1)346.3 
For the Nine Months Ended September 30, 2020
Eversource
(Millions of Dollars)
Electric
Distribution
Natural Gas
Distribution (1)
Electric
Transmission		Water Distribution
Other (1)
Eliminations (1)
Total
Operating Revenues$5,481.9 $770.0 $1,135.6 $166.6 $900.7 $(1,784.3)$6,670.5 
Depreciation and Amortization(490.0)(55.1)(206.8)(33.1)(68.1)1.2 (851.9)
Other Operating Expenses(4,309.9)(592.0)(338.5)(60.7)(771.4)1,787.9 (4,284.6)
Operating Income$682.0 $122.9 $590.3 $72.8 $61.2 $4.8 $1,534.0 
Interest Expense$(160.7)$(32.1)$(93.8)$(25.1)$(119.0)$27.6 $(403.1)
Other Income, Net44.9 2.5 22.7 1.7 1,087.9 (1,076.1)83.6 
Net Income Attributable to Common Shareholders450.6 73.3 381.8 35.6 1,035.6 (1,043.7)933.2 
Cash Flows Used for Investments in Plant781.2 322.8 732.4 84.0 181.2 — 2,101.6 

(1)    On October 9, 2020, Eversource completed the CMA asset acquisition, with Yankee Energy System, Inc. (Yankee parent) as the acquiring entity. Yankee parent is the parent company of Yankee Gas, NSTAR Gas, EGMA and Hopkinton LNG Corp. As a result of the acquisition, in the fourth quarter of 2020, our chief operating decision maker assessed the performance of the Natural Gas Distribution segment including Yankee parent. Previously, Yankee parent was presented within Other and its equity in earnings were eliminated in consolidation. Prior comparative periods were revised to conform to the current period segment presentation.

The following table summarizes Eversource's segmented total assets:
Eversource
(Millions of Dollars)
Electric
Distribution		Natural Gas
Distribution		Electric
Transmission		Water DistributionOtherEliminationsTotal
As of September 30, 2021$25,604.2 $6,865.6 $12,123.5 $2,444.9 $21,624.5 $(20,648.6)$48,014.1 
As of December 31, 202024,981.9 6,450.5 11,695.0 2,375.2 22,089.4 (21,492.4)46,099.6