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SEGMENT INFORMATION (Tables)
 12 Months Ended
Dec. 31, 2021
Segment Reporting [Abstract]  
Summary of Segment Information and Segmented Total Assets
Eversource's segment information is as follows:
 For the Year Ended December 31, 2021
Eversource
(Millions of Dollars)
Electric
Distribution		Natural Gas
Distribution		Electric TransmissionWater DistributionOtherEliminationsTotal
Operating Revenues$7,423.6 $1,789.6 $1,634.6 $211.3 $1,354.0 $(2,550.0)$9,863.1 
Depreciation and Amortization(737.8)(142.3)(300.3)(46.1)(113.1)4.6 (1,335.0)
Other Operating Expenses(5,970.0)(1,345.4)(496.2)(101.4)(1,170.4)2,548.6 (6,534.8)
Operating Income715.8 301.9 838.1 63.8 70.5 3.2 1,993.3 
Interest Expense(236.4)(58.6)(133.2)(32.0)(168.8)46.6 (582.4)
Interest Income20.7 4.5 2.2 — 46.0 (47.8)25.6 
Other Income, Net78.1 17.9 19.8 3.3 1,363.9 (1,347.3)135.7 
Income Tax (Expense)/Benefit(103.5)(60.9)(179.4)1.7 (2.1)— (344.2)
Net Income474.7 204.8 547.5 36.8 1,309.5 (1,345.3)1,228.0 
Net Income Attributable to Noncontrolling Interests(4.6)— (2.9)— — — (7.5)
Net Income Attributable to Common Shareholders$470.1 $204.8 $544.6 $36.8 $1,309.5 $(1,345.3)$1,220.5 
Total Assets (as of)$25,411.2 $7,215.9 $12,377.8 $2,551.1 $22,674.7 $(21,738.6)$48,492.1 
Cash Flows Used for Investments in Plant$1,053.3 $721.1 $1,024.1 $137.2 $239.4 $— $3,175.1 
 For the Year Ended December 31, 2020
Eversource
(Millions of Dollars)
Electric
Distribution		Natural Gas
Distribution		Electric
Transmission		Water 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 DistributionOtherEliminationsTotal
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 
Cash Flows Used for Investments in Plant$1,104.2 $460.2 $987.0 $118.0 $242.1 $— $2,911.5