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ASSET RETIREMENT OBLIGATIONS (Tables) | 12 Months Ended
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Dec. 31, 2022
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Change in Asset Retirement Obligation | A reconciliation of the beginning and ending carrying amounts of ARO liabilities is as follows:
| As of December 31,
| 2022 |  | 2021
(Millions of Dollars) | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH |  | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH
Balance as of Beginning of Year | $ | 500.1 |  |  | $ | 35.0 |  |  | $ | 97.5 |  |  | $ | 4.7 |  |  | $ | 499.7 |  |  | $ | 33.4 |  |  | $ | 91.8 |  |  | $ | 4.4 |
Liabilities Settled During the Year | (22.3) |  |  | — |  |  | — |  |  | — |  |  | (23.9) |  |  | (0.6) |  |  | — |  |  | — |
Accretion | 28.9 |  |  | 2.4 |  |  | 4.1 |  |  | 0.2 |  |  | 29.4 |  |  | 2.2 |  |  | 4.0 |  |  | 0.3 |
Revisions in Estimated Cash Flows | (4.0) |  |  | — |  |  | (0.3) |  |  | — |  |  | (5.1) |  |  | — |  |  | 1.7 |  |  | — |
Balance as of End of Year | $ | 502.7 |  |  | $ | 37.4 |  |  | $ | 101.3 |  |  | $ | 4.9 |  |  | $ | 500.1 |  |  | $ | 35.0 |  |  | $ | 97.5 |  |  | $ | 4.7 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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