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SEGMENT INFORMATION
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
SEGMENT INFORMATION SEGMENT INFORMATION
Eversource is organized into the Electric Distribution, Electric Transmission, Natural Gas Distribution and Water Distribution reportable segments and Other based on a combination of factors, including the characteristics of each segments' services, the sources of operating revenues and expenses and the regulatory environment in which each segment operates.  These reportable segments represent substantially all of Eversource's total consolidated revenues.  Revenues from the sale of electricity, natural gas and water primarily are derived from residential, commercial and industrial customers and are not dependent on any single customer.  The Electric Distribution reportable segment includes the results of PSNH's generation facilities prior to sales in January and August 2018, and NSTAR Electric's solar power facilities. Eversource's reportable segments are determined based upon the level at which Eversource's chief operating decision maker assesses performance and makes decisions about the allocation of company resources.  

The remainder of Eversource's operations is presented as Other in the tables below and primarily consists of 1) the equity in earnings of Eversource parent from its subsidiaries and intercompany interest income, both of which are eliminated in consolidation, and interest expense related to the debt of Eversource parent, 2) the revenues and expenses of Eversource Service, most of which are eliminated in consolidation, 3) the operations of CYAPC and YAEC, 4) Eversource Water Ventures, Inc., parent company of Aquarion, 5) the results of other unregulated subsidiaries, which are not part of its core business, and 6) Eversource parent's equity ownership interests that are not consolidated, which primarily include the offshore wind business, a natural gas pipeline owned by Enbridge, Inc., and a renewable energy investment fund.

In the ordinary course of business, Yankee Gas, NSTAR Gas and EGMA purchase natural gas transmission services from the Enbridge, Inc. natural gas pipeline project described above. These affiliate transaction costs total $77.7 million annually and are classified as Purchased Power, Fuel and Transmission on the Eversource statements of income.

Each of Eversource's subsidiaries, including CL&P, NSTAR Electric and PSNH, has one reportable segment.  

Cash flows used for investments in plant included in the segment information below are cash capital expenditures that do not include amounts incurred but not paid, cost of removal, AFUDC related to equity funds, and the capitalized portions of pension and PBOP expense.
Eversource's segment information is as follows:
 For the Year Ended December 31, 2020
Eversource
(Millions of Dollars)
Electric
Distribution		Natural Gas
Distribution		Electric TransmissionWater DistributionOtherEliminationsTotal
Operating Revenues$7,132.3 $1,208.7 $1,536.1 $215.4 $1,235.9 $(2,424.0)$8,904.4 
Depreciation and Amortization(657.0)(87.9)(278.1)(44.2)(93.5)1.6 (1,159.1)
Other Operating Expenses(5,642.3)(913.8)(470.0)(86.6)(1,071.9)2,428.0 (5,756.6)
Operating Income833.0 207.0 788.0 84.6 70.5 5.6 1,988.7 
Interest Expense(216.0)(40.0)(126.8)(32.9)(161.0)38.3 (538.4)
Interest Income3.2 0.9 4.7 — 37.8 (41.8)4.8 
Other Income, Net58.0 3.1 23.3 2.0 1,382.9 (1,365.5)103.8 
Income Tax (Expense)/Benefit(129.6)(36.9)(183.8)(12.5)16.6 — (346.2)
Net Income548.6 134.1 505.4 41.2 1,346.8 (1,363.4)1,212.7 
Net Income Attributable to Noncontrolling Interests(4.6)— (2.9)— — — (7.5)
Net Income Attributable to Common Shareholders$544.0 $134.1 $502.5 $41.2 $1,346.8 $(1,363.4)$1,205.2 
Total Assets (as of)$24,981.9 $6,450.5 $11,695.0 $2,375.2 $22,089.4 $(21,492.4)$46,099.6 
Cash Flows Used for Investments in Plant$1,079.0 $494.4 $1,004.6 $118.8 $246.2 $— $2,943.0 
 For the Year Ended December 31, 2019
Eversource
(Millions of Dollars)
Electric
Distribution		Natural Gas
Distribution		Electric
Transmission		Water Distribution
Other (1)
Eliminations (1)
Total
Operating Revenues$6,976.5 $1,062.2 $1,389.0 $214.6 $1,028.5 $(2,144.3)$8,526.5 
Depreciation and Amortization(651.3)(68.3)(253.3)(46.9)(63.2)2.3 (1,080.7)
Impairment of Northern Pass Transmission— — (239.6)— — — (239.6)
Other Operating Expenses(5,525.1)(830.8)(411.2)(101.0)(891.3)2,143.7 (5,615.7)
Operating Income800.1 163.1 484.9 66.7 74.0 1.7 1,590.5 
Interest Expense(206.4)(47.4)(125.7)(34.6)(170.3)51.2 (533.2)
Interest Income13.3 0.1 1.5 — 48.7 (50.8)12.8 
Other Income, Net46.8 1.6 29.2 0.4 945.3 (903.3)120.0 
Income Tax (Expense)/Benefit(135.9)(21.2)(130.5)2.4 11.7 — (273.5)
Net Income517.9 96.2 259.4 34.9 909.4 (901.2)916.6 
Net Income Attributable to Noncontrolling Interests(4.6)— (2.9)— — — (7.5)
Net Income Attributable to Common Shareholders$513.3 $96.2 $256.5 $34.9 $909.4 $(901.2)$909.1 
Total Assets (as of)$22,541.9 $4,345.5 $10,904.0 $2,351.7 $18,843.7 $(17,862.9)$41,123.9 
Cash Flows Used for Investments in Plant$1,104.2 $460.2 $987.0 $118.0 $242.1 $— $2,911.5 
 For the Year Ended December 31, 2018
Eversource
(Millions of Dollars)
Electric
Distribution		Natural Gas
Distribution		Electric
Transmission		Water Distribution
Other (1)
Eliminations (1)
Total
Operating Revenues$6,957.2 $1,022.2 $1,286.3 $212.0 $936.3 $(1,965.8)$8,448.2 
Depreciation and Amortization(671.8)(75.0)(231.8)(46.5)(49.1)2.2 (1,072.0)
Other Operating Expenses(5,548.6)(787.6)(375.5)(99.8)(831.5)1,966.7 (5,676.3)
Operating Income736.8 159.6 679.0 65.7 55.7 3.1 1,699.9 
Interest Expense(202.8)(44.1)(120.6)(34.3)(129.3)32.3 (498.8)
Interest Income18.7 — 2.4 — 30.3 (33.3)18.1 
Other Income/(Loss), Net67.5 7.1 31.1 (0.4)1,092.1 (1,087.1)110.3 
Income Tax (Expense)/Benefit(160.2)(29.4)(161.8)(0.1)62.5 — (289.0)
Net Income460.0 93.2 430.1 30.9 1,111.3 (1,085.0)1,040.5 
Net Income Attributable to Noncontrolling Interests(4.6)— (2.9)— — — (7.5)
Net Income Attributable to Common Shareholders$455.4 $93.2 $427.2 $30.9 $1,111.3 $(1,085.0)$1,033.0 
Cash Flows Used for Investments in Plant$961.3 $351.5 $976.2 $102.3 $178.6 $— $2,569.9 

(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.