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Fair Value Measurement (Unobservable inputs) (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Other Assets, Current | $ 560 |  |  | $ 422
Other Assets, Noncurrent | 2,174 |  |  | 2,172
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 | (5) |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value at January 1, 2019 | 127 |  |  |
Net unrealized loss related to assets still held at the end of the period | (5) |  |  |
Fair value at March 31, 2019 | 117 |  |  |
Onshore California [Member] | Freeport-McMoRan Oil & Gas |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Contingent Receivable | 150 |  |  |
Other Assets, Current | 13 |  |  |
Other Assets, Noncurrent | $ 16 |  |  | $ 16
Onshore California [Member] | Scenario, Forecast [Member] | Freeport-McMoRan Oil & Gas |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Contingent Receivable |  | $ 50 | $ 50 |

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- Definition Amount of increase (decrease) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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