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EMPLOYEE BENEFITS - Share-Based Payments Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted in incentive plan (up to) (in shares) | 6,700,000 |  |
Shares available for issuance under incentive plan (in shares) | 2,430,716 | 2,876,601 |
Shares outstanding (in shares) | 297,270 |  |
Weighted average grant date fair value of restricted stock units (in dollars per share) | $ 72.37 |  |
Total unrecognized compensation expense | $ 17.8 |  |
Period for recognition | 1 year 8 months 19 days |  |
Tax effect on total share-based payments (in percentage) | 26.00% |  |
Excess stock benefit | $ 4.0 | $ 6.6 | $ 1.5
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in dollars per share) | $ 81.89 | $ 88.23 | $ 67.91
Shares outstanding (in shares) |  | 379,258 |
Weighted average shares outstanding (in dollars per share) | $ 83.39 | $ 77.13 |
Restricted stock units available (in shares) | 219,560 |  |
Restricted stock unit fully vested (in shares) | 297,353 |  |
Additional restricted stock unit expected to vest (in shares) | 282,407 |  |
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in dollars per share) | $ 76.08 | $ 75.36 | $ 68.33
Shares outstanding (in shares) | 436,957 | 404,698 |
Weighted average shares outstanding (in dollars per share) | $ 81.41 | $ 70.85 |
Restricted stock units available (in shares) | 241,949 |  |
Weighted average grant date fair value of restricted stock units (in dollars per share) | $ 57.23 |  |
Restricted stock unit fully vested (in shares) | 27,550 |  |
The Connecticut Light and Power Company |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total unrecognized compensation expense | $ 3.2 |  |
Excess stock benefit | 1.5 | $ 2.3 | $ 0.5
NSTAR Electric Company |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total unrecognized compensation expense | 5.0 |  |
Excess stock benefit | 1.4 | 2.3 | 0.5
Public Service Company of New Hampshire |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total unrecognized compensation expense | 1.1 |  |
Excess stock benefit | $ 0.5 | $ 0.8 | $ 0.2
Employee |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period of graded vesting schedule under long-term incentive program | 3 years |  |
Board Members |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period of graded vesting schedule under long-term incentive program | 1 year |  |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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