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Fair Value Measurement - Unobservable inputs (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Other Assets, Current | $ 406 | $ 381 |
Other Assets, Noncurrent | 1,709 | 1,601 |
Gulf of Mexico Contingent Consideration |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair value at January 1, 2023 | 57 |  |
Net unrealized gain related to assets still held at the end of the period | 1 |  |
Settlements | (11) |  |
Fair value at September 30, 2023 | 47 |  |
Deepwater Gulf of Mexico Interests | Freeport-McMoRan Oil & Gas |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Contingent Receivable |  |  | $ 150
Other Assets, Current | 17 | 20 |
Other Assets, Noncurrent | $ 38 | $ 47 |

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