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Dispositions Disposals (Freeport Cobalt and Kisanfu) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  | $ 66 | $ 762
Gain (Loss) on Disposition of Assets | $ 33 | $ 13 | $ 66 | $ 762
Freeport Cobalt [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership percentage | 56.00% |  | 56.00% |
Kisanfu Exploration Project |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership percentage | 100.00% |  | 100.00% |
Freeport Cobalt And Kisanfu Exploration Project [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain (Loss) on Disposition of Assets |  |  | $ 13 |

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