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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%