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INVESTMENT IN UNCONSOLIDATED SUBSIDIARY AND RELATED PARTY TRANSACTIONS - Narrative (Details) MT in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 30, 2024 USD ($) | Aug. 31, 2022 USD ($) installment MT | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2023 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Contingent liability (related to Carbon TerraVault JV put and call rights) |  |  | $ 248 |  | $ 248 |  |  | $ 201
Carbon TerraVault JV |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Interest in joint venture |  | 51.00% |  |  |  |  |  |
Carbon TerraVault JV | Related Party |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Contingent liability (related to Carbon TerraVault JV put and call rights) |  |  | 102 |  | 102 |  |  | $ 52
Carbon TerraVault JV | Brookfield |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Interest in joint venture |  | 49.00% |  |  |  |  |  |
Committed amount |  | $ 500 |  |  |  |  |  |
Initial investment |  | $ 137 |  |  |  |  |  |
Number of installments | installment |  | 3 |  |  |  |  |  |
Number of installments subject to certain milestones | installment |  | 2 |  |  |  |  |  |
Contribution from noncontrolling interest | $ 46 |  |  |  |  |  | $ 46 |
Metric tons of carbon per annum | MT |  | 5 |  |  |  |  |  |
Elk Hills |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Reimbursement for abandonment work |  |  | $ 5 | $ 1 | $ 9 | $ 2 |  |

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