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EMPLOYEE BENEFITS - Share-Based Payments Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted in incentive plan (up to) (in shares) | 7,400,000 |  |
Shares available for issuance under incentive plan (in shares) | 3,790,353 | 4,587,376 |
Shares outstanding (in shares) | 455,620 |  |
Weighted average grant date fair value of restricted stock units (in dollars per share) | $ 65.20 |  |
Total unrecognized compensation expense | $ 31.2 |  |
Period for recognition | 1 year 9 months 3 days |  |
Tax effect on total share-based payments (in percentage) | 26.00% |  |
Excess stock benefit | $ (2.3) | $ (0.5) | $ 2.1
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in dollars per share) | $ 57.93 | $ 76.42 | $ 85.96
Shares outstanding (in shares) |  | 326,581 |
Weighted average shares outstanding (in dollars per share) | $ 65.29 | $ 80.76 |
Restricted stock units available (in shares) | 280,938 |  |
Restricted stock unit fully vested (in shares) | 259,822 |  |
Additional restricted stock unit expected to vest (in shares) | 432,839 |  |
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in dollars per share) | $ 55.87 | $ 83.39 | $ 83.34
Shares outstanding (in shares) | 737,738 | 485,480 |
Weighted average shares outstanding (in dollars per share) | $ 69.12 | $ 85.20 |
Restricted stock units available (in shares) | 72,723 |  |
Weighted average grant date fair value of restricted stock units (in dollars per share) | $ 84.87 |  |
Restricted stock unit fully vested (in shares) | 126,454 |  |
CL&P |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total unrecognized compensation expense | $ 5.5 |  |
Period for recognition | 1 year 9 months 3 days |  |
Excess stock benefit | $ (0.8) | $ (0.2) | $ 0.7
NSTAR Electric |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total unrecognized compensation expense | $ 8.8 |  |
Period for recognition | 1 year 9 months 7 days |  |
Excess stock benefit | $ (0.8) | (0.2) | 0.8
PSNH |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total unrecognized compensation expense | $ 2.0 |  |
Period for recognition | 1 year 9 months 3 days |  |
Excess stock benefit | $ (0.3) | $ (0.1) | $ 0.3
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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