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ASSET RETIREMENT OBLIGATIONS (Tables) | 12 Months Ended
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Dec. 31, 2021
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,
| 2021 |  | 2020
(Millions of Dollars) | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH |  | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH
Balance as of Beginning of Year | $ | 499.7 |  |  | $ | 33.4 |  |  | $ | 91.8 |  |  | $ | 4.4 |  |  | $ | 489.5 |  |  | $ | 32.0 |  |  | $ | 97.5 |  |  | $ | 4.2 |
Liability Assumed Upon CMA Asset Acquisition | — |  |  | — |  |  | — |  |  | — |  |  | 20.1 |  |  | — |  |  | — |  |  | — |
Liabilities Incurred During the Year | — |  |  | — |  |  | — |  |  | — |  |  | 2.1 |  |  | — |  |  | 2.1 |  |  | — |
Liabilities Settled During the Year | (23.9) |  |  | (0.6) |  |  | — |  |  | — |  |  | (21.8) |  |  | (0.7) |  |  | (1.0) |  |  | — |
Accretion | 29.4 |  |  | 2.2 |  |  | 4.0 |  |  | 0.3 |  |  | 28.9 |  |  | 2.1 |  |  | 4.3 |  |  | 0.2 |
Revisions in Estimated Cash Flows | (5.1) |  |  | — |  |  | 1.7 |  |  | — |  |  | (19.1) |  |  | — |  |  | (11.1) |  |  | — |
Balance as of End of Year | $ | 500.1 |  |  | $ | 35.0 |  |  | $ | 97.5 |  |  | $ | 4.7 |  |  | $ | 499.7 |  |  | $ | 33.4 |  |  | $ | 91.8 |  |  | $ | 4.4 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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