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STOCK-BASED COMPENSATION - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) day metric shares | Dec. 31, 2023 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cost not yet recognized, amount | $ | $ 59 |  |
Cost not yet recognized, period for recognition | 1 year 6 months |  |
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award performance period | 3 years |  |
Award performance score, lower | 0.00% |  |
Award performance score, higher | 200.00% |  |
Vesting period | 3 years | 3 years | 3 years
Number of performance metrics | metric | 3 |  |
Performance metric, operating period term | 3 years |  |
Performance metric, operating period, weight | 50.00% |  |
Performance metric, relative total shareholder return, weight | 40.00% |  |
Performance metric, generation capacity additions, weight | 10.00% |  |
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Service period | 3 years |  |
Aggregate intrinsic value of nonvested | $ | $ 44 |  |
Weighted-average remaining contractual life | 1 year 6 months |  |
Restricted Stock Units | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period | 40 months |  |
Stock Unit Accumulation Plan | Non-Employee Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of trading days | day | 20 |  |
Stock Unit Accumulation Plan | Maximum | Non-Employee Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award payment period | 10 years |  |
Stock Unit Accumulation Plan | Minimum | Non-Employee Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Subsequent award period | 5 years |  |
2024 Long-Term Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares available for grant (in shares) | shares | 10,000,000 |  |
Common stock, capital shares reserved for future issuance (in shares) | shares | 9,806,016 |  |
Shares available for grant, reduction rate | 1 |  |

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