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EMPLOYEE BENEFITS - Share-Based Payments Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted in incentive plan (up to) (in shares) | 3,200,000 |  |
Shares available for issuance under incentive plan (in shares) | 903,183 | 2,430,716 |
Shares outstanding (in shares) | 300,592 |  |
Weighted average grant date fair value of restricted stock units (in dollars per share) | $ 81.07 |  |
Total unrecognized compensation expense | $ 24.5 |  |
Period for recognition | 1 year 9 months 7 days |  |
Tax effect on total share-based payments (in percentage) | 26.00% |  |
Excess stock benefit | $ 2.1 | $ 4.0 | $ 6.6
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in dollars per share) | $ 85.96 | $ 81.89 | $ 88.23
Shares outstanding (in shares) |  | 297,270 |
Weighted average shares outstanding (in dollars per share) | $ 87.21 | $ 83.39 |
Restricted stock units available (in shares) | 184,540 |  |
Restricted stock unit fully vested (in shares) | 329,142 |  |
Additional restricted stock unit expected to vest (in shares) | 285,562 |  |
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in dollars per share) | $ 83.34 | $ 76.08 | $ 75.36
Shares outstanding (in shares) | 457,069 | 436,957 |
Weighted average shares outstanding (in dollars per share) | $ 88.43 | $ 81.41 |
Restricted stock units available (in shares) | 311,553 |  |
Weighted average grant date fair value of restricted stock units (in dollars per share) | $ 73.15 |  |
Restricted stock unit fully vested (in shares) | 90,221 |  |
CL&P |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total unrecognized compensation expense | $ 4.0 |  |
Excess stock benefit | 0.7 | $ 1.5 | $ 2.3
NSTAR Electric |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total unrecognized compensation expense | 6.9 |  |
Excess stock benefit | 0.8 | 1.4 | 2.3
PSNH |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total unrecognized compensation expense | 1.4 |  |
Excess stock benefit | $ 0.3 | $ 0.5 | $ 0.8
CL&P, NSTAR Electric and PSNH |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period for recognition | 1 year 9 months 10 days |  |
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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