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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION -Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2021
Property, Plant and Equipment [Line Items] |  |  |
Total Assets (as of) |  | $ 46,099,598 | $ 48,492,144
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Hingham Water System |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, net | $ 63,900 |  |
Goodwill | 23,600 |  |
Proceeds from the sale of Hingham Water System | $ 110,500 |  |
Pre-tax gain (loss) on sale of property, plant and equipment |  | 16,000 |
After-tax gain (loss) on the sale of property, plant and equipment |  | 3,500 |
Eversource Gas Company of Massachusetts |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total Assets (as of) |  | $ 1,200,000 |

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