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INVESTMENTS AND RELATED PARTY TRANSACTIONS - Changes Investments in Unconsolidated Subsidiaries (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Equity Method Investments [Roll Forward] |  |  |  |
Equity Method Investments, Beginning Balance |  | $ 19 |  |
Income (loss) from investment in unconsolidated subsidiary |  | (10) | $ (9) | $ (1)
Equity Method Investments, Ending Balance | $ 86 | 86 | 19 |
Midway Sunset Cogeneration Company |  |  |  |
Equity Method Investments [Roll Forward] |  |  |  |
Income (loss) from investment in unconsolidated subsidiary | 2 |  |  |
Distributions | (2) |  |  |
Equity Method Investments, Ending Balance | 59 | 59 |  |
Carbon TerraVault JV |  |  |  |
Equity Method Investments [Roll Forward] |  |  |  |
Equity Method Investments, Beginning Balance |  | 19 | 13 |
Income (loss) from investment in unconsolidated subsidiary |  | (12) | (9) |
Contributions |  | 20 | 15 |
Equity Method Investments, Ending Balance | $ 27 | $ 27 | $ 19 | $ 13

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