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SEGMENT INFORMATION (Tables)
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Summary of Segment Information and Segmented Total Assets
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.