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GOODWILL (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Goodwill by Reportable Segment | The following table presents goodwill by reportable segment:
(Millions of Dollars) | Electric Distribution |  | Electric Transmission |  | Natural Gas Distribution |  | Water Distribution |  | Total
Balance as of January 1, 2020 | $ | 2,544 |  |  | $ | 577 |  |  | $ | 399 |  |  | $ | 907 |  |  | $ | 4,427 |
Acquisition of CMA Assets | — |  |  | — |  |  | 42 |  |  | — |  |  | 42 |
Sale of Hingham water system | — |  |  | — |  |  | — |  |  | (23) |  |  | (23) |
Balance as of December 31, 2020 | $ | 2,544 |  |  | $ | 577 |  |  | $ | 441 |  |  | $ | 884 |  |  | $ | 4,446 |
CMA Measurement Period Adjustments | — |  |  | — |  |  | 10 |  |  | — |  |  | 10 |
Acquisition of NESC | — |  |  | — |  |  | — |  |  | 21 |  |  | 21 |
Balance as of December 31, 2021 | $ | 2,544 |  |  | $ | 577 |  |  | $ | 451 |  |  | $ | 905 |  |  | $ | 4,477 |

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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 http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 + Details
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