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SEGMENT INFORMATION (Tables)
 12 Months Ended
Dec. 31, 2023
Segment Reporting [Abstract]  
Summary of Segment Information and Segmented Total Assets Eversource's segment information is as follows:
 For the Year Ended December 31, 2023
Eversource
(Millions of Dollars)
Electric
Distribution		Natural Gas
Distribution		Electric TransmissionWater DistributionOtherEliminationsTotal
Operating Revenues$8,973.5 $2,221.7 $1,915.9 $232.5 $1,636.6 $(3,069.5)$11,910.7 
Depreciation and Amortization(18.2)(214.2)(371.2)(56.0)(158.8)2.7 (815.7)
Other Operating Expenses(8,104.6)(1,662.6)(550.5)(117.1)(1,329.8)3,068.9 (8,695.7)
Operating Income850.7 344.9 994.2 59.4 148.0 2.1 2,399.3 
Interest Expense(291.7)(85.7)(163.7)(38.5)(425.3)149.5 (855.4)
Impairments of Offshore Wind Investments— — — — (2,167.0)— (2,167.0)
Interest Income74.5 18.2 0.4 — 150.6 (149.5)94.2 
Other Income/(Loss), Net136.2 20.4 41.2 5.9 (261.8)312.0 253.9 
Income Tax (Expense)/Benefit(157.1)(73.0)(225.8)6.3 289.9 — (159.7)
Net Income/(Loss)612.6 224.8 646.3 33.1 (2,265.6)314.1 (434.7)
Net Income Attributable to Noncontrolling Interests(4.6)— (2.9)— — — (7.5)
Net Income/(Loss) Attributable to
   Common Shareholders		$608.0 $224.8 $643.4 $33.1 $(2,265.6)$314.1 $(442.2)
Total Assets (as of)$29,426.4 $8,775.3 $14,806.5 $2,944.8 $26,337.7 $(26,678.5)$55,612.2 
Cash Flows Used for Investments in Plant$1,668.1 $844.1 $1,406.3 $167.0 $251.3 $— $4,336.8 
 For the Year Ended December 31, 2022
Eversource
(Millions of Dollars)
Electric
Distribution		Natural Gas
Distribution		Electric
Transmission		Water DistributionOtherEliminationsTotal
Operating Revenues$9,405.3 $2,215.6 $1,808.7 $222.5 $1,435.5 $(2,798.3)$12,289.3 
Depreciation and Amortization(970.4)(157.6)(337.4)(50.9)(132.6)5.8 (1,643.1)
Other Operating Expenses(7,663.7)(1,727.0)(548.4)(111.8)(1,189.1)2,792.0 (8,448.0)
Operating Income771.2 331.0 922.9 59.8 113.8 (0.5)2,198.2 
Interest Expense(253.1)(71.4)(145.5)(34.7)(247.8)74.2 (678.3)
Interest Income45.1 10.2 0.5 — 66.3 (71.6)50.5 
Other Income, Net180.4 33.6 37.9 8.5 1,600.8 (1,565.6)295.6 
Income Tax (Expense)/Benefit(146.2)(69.2)(216.3)3.2 (25.1)— (453.6)
Net Income597.4 234.2 599.5 36.8 1,508.0 (1,563.5)1,412.4 
Net Income Attributable to Noncontrolling Interests(4.6)— (2.9)— — — (7.5)
Net Income Attributable to Common Shareholders$592.8 $234.2 $596.6 $36.8 $1,508.0 $(1,563.5)$1,404.9 
Total Assets (as of)$27,365.0 $8,084.9 $13,369.5 $2,783.8 $26,365.2 $(24,737.5)$53,230.9 
Cash Flows Used for Investments in Plant$1,172.6 $710.3 $1,144.0 $154.4 $260.6 $— $3,441.9 
 For the Year Ended December 31, 2021
Eversource
(Millions of Dollars)
Electric
Distribution		Natural Gas
Distribution		Electric
Transmission		Water 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 
Cash Flows Used for Investments in Plant$1,053.3 $721.1 $1,024.1 $137.2 $239.4 $— $3,175.1