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GOODWILL (Tables) | 12 Months Ended
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Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Goodwill by Reportable Segment | The following table presents Eversource’s goodwill by reportable segment:
(Millions of Dollars) | Electric Distribution |  | Electric Transmission |  | Natural Gas Distribution |  | Water Distribution |  | Total
Balance as of January 1, 2021 | $ | 2,543.6 |  |  | $ | 576.8 |  |  | $ | 441.4 |  |  | $ | 884.2 |  |  | $ | 4,446.0 |
CMA Measurement Period Adjustments | — |  |  | — |  |  | 9.6 |  |  | — |  |  | 9.6 |
Acquisition of NESC | — |  |  | — |  |  | — |  |  | 21.7 |  |  | 21.7 |
Balance as of December 31, 2021 | $ | 2,543.6 |  |  | $ | 576.8 |  |  | $ | 451.0 |  |  | $ | 905.9 |  |  | $ | 4,477.3 |
NESC Measurement Period Adjustments | — |  |  | — |  |  | — |  |  | 0.5 |  |  | 0.5 |
Acquisition of TWC | — |  |  | — |  |  | — |  |  | 44.8 |  |  | 44.8 |
Balance as of December 31, 2022 | $ | 2,543.6 |  |  | $ | 576.8 |  |  | $ | 451.0 |  |  | $ | 951.2 |  |  | $ | 4,522.6 |

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- Definition Tabular disclosure of goodwill in a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126975305&loc=d3e6927-128479 + Details
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