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Dispositions (TF Holdings Limited) (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 16, 2016 USD ($) $ / lb | Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Nov. 15, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Other assets |  | $ 1,790 | $ 1,790 |  | $ 1,956 |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  | $ 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% |  |  |
Discontinued Operations, Disposed of by Sale | TF Holdings Limited |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from divestiture, net | $ 2,650 |  |  |  |  |
Contingent receivable | 120 |  |  |  |  |
Other assets |  | $ 58 | $ 58 |  |  |
Discontinued Operation, Change in Contingent Receivable |  | $ 3 | $ 45 |  |  |
Copper | Discontinued Operations, Disposed of by Sale | TF Holdings Limited |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Contingent receivable | $ 60 |  |  |  |  |
Contingent consideration, reference threshold (in us dollars per pound) | $ / lb | 3.50 |  |  |  |  |
Cobalt | Discontinued Operations, Disposed of by Sale | TF Holdings Limited |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Contingent receivable | $ 60 |  |  |  |  |
Contingent consideration, reference threshold (in us dollars per pound) | $ / lb | 20 |  |  |  |  |
Tenke Fungurume [Member] | TF Holdings Limited |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 80.00%
TF Holdings Limited |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 70.00%

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