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Fair Value Measurement (Unobservable inputs) (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Other Assets, Current | $ 419 | $ 655 |
Other Assets, Noncurrent | 1,654 | 1,885 |
Gulf of Mexico Contingent Consideration [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (9) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair value at January 1, 2020 | 108 |  |
Net unrealized loss related to assets still held at the end of the period | (15) |  |
Fair value at September 30, 2020 | 84 |  |
Onshore California [Member] | Freeport-McMoRan Oil & Gas |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Contingent Receivable |  |  | $ 150
Other Assets, Noncurrent | $ 0 | $ 11 |

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