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General Information (Unaudited) Asset Dispositions (Details) - USD ($) | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2016 | Mar. 31, 2016
Morenci [Member] |  |  |  |
Percentage Of Undivided Interest Owned By Company |  |  |  | 85.00%
Morenci [Member] | Sumitomo Metal Mining Arizona Inc. [Member] |  |  |  |
Percent Of Undivided Interest Owned By Third Party |  |  |  | 15.00%
Morenci [Member] | Subsequent Event [Member] |  |  |  |
Disposal Date |  | Feb. 15, 2016 |  |
Proceeds from Sale of Productive Assets |  | $ 1,000,000,000 |  |
Change in Ownership, Percentage |  | 13.00% |  |
Gain (Loss) on Sale of Previously Unissued Stock by Subsidiary |  | $ 550,000,000 |  |
Percentage Of Undivided Interest Owned By Company |  | 72.00% |  |
Morenci [Member] | Subsequent Event [Member] | Sumitomo Metal Mining Arizona Inc. [Member] |  |  |  |
Percent Of Undivided Interest Owned By Third Party |  | 15.00% |  |
Morenci [Member] | Subsequent Event [Member] | Sumitomo Metal Mining Co., Ltd. [Member] |  |  |  |
Percent Of Undivided Interest Owned By Third Party |  | 13.00% |  |
Oil and Gas Royalty Interests [Member] | Subsequent Event [Member] |  |  |  |
Disposal Date | Apr. 21, 2016 |  |  |
Proceeds from Sale of Productive Assets | $ 102,000,000 |  |  |
Serbia [Member] | Subsequent Event [Member] |  |  |  |
Disposal Date |  | May 02, 2016 |  |
Proceeds from Sale of Productive Assets |  | $ 135,000,000 |  |
Contingent Consideration Arrangements, Range of Outcomes, Value, High |  | $ 128,000,000 |  |
Tenke Fungurume [Member] | Tenke Segments [Member] |  |  |  |
Percentage Of Undivided Interest Owned By Company |  |  |  | 56.00%
Tenke Fungurume [Member] | Lundin Mining Corporation [Member] |  |  |  |
Percent Of Undivided Interest Owned By Third Party |  |  |  | 30.00%
Tenke Fungurume [Member] | Subsequent Event [Member] |  |  |  |
Disposal Date |  |  | May 09, 2016 |
Proceeds from Divestiture of Businesses, Net of Cash Divested |  |  | $ 2,650,000,000 |
Percentage Of Undivided Interest Owned By Company |  |  | 70.00% |
Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  | $ 120,000,000 |
Tenke Fungurume [Member] | Copper [Member] | Subsequent Event [Member] |  |  |  |
Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  | 60,000,000 |
Contingent Consideration, Reference Price |  |  | 3.50 |
Tenke Fungurume [Member] | Cobalt [Member] | Subsequent Event [Member] |  |  |  |
Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  | 60,000,000 |
Contingent Consideration, Reference Price |  |  | 20 |
Freeport Cobalt [Member] |  |  |  |
Percentage Of Undivided Interest Owned By Company |  |  |  | 56.00%
Freeport Cobalt [Member] | Subsequent Event [Member] |  |  |  |
Proceeds from Divestiture of Businesses, Net of Cash Divested |  |  | 100,000,000 |
Kisanfu Exploration Project [Member] |  |  |  |
Percentage Of Undivided Interest Owned By Company |  |  |  | 100.00%
Kisanfu Exploration Project [Member] | Subsequent Event [Member] |  |  |  |
Proceeds from Divestiture of Businesses, Net of Cash Divested |  |  | $ 50,000,000 |

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