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Dispositions Dispositions (Morenci) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 31, 2016 | Jun. 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
Morenci [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from divestiture, net | $ 1,000 |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  | $ 576 |  |
Morenci [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership percentage |  |  | 72.00% |
SMM Morenci Inc. [Member] | Morenci [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership percentage | 13.00% |  |  |
Sumitomo Metal Mining Co., Ltd. [Member] | Morenci [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership percentage |  |  | 15.00% |
Wholly Owned Affiliate Of SMM [Member] | Morenci [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership percentage |  |  | 13.00% |

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- Definition Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=63488139&loc=d3e12121-115841 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.3) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column D.2) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010 + Details
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