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Income Taxes (Unaudited) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Schedule Of Income Taxes [Line Items]        
U.S. operationsa $ 2 $ 331 $ 24 $ 293
International operations 389 217 771 372
Total (387) 114 $ (747) (79)
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount       $ 1,600
Effective Income Tax Rate, Adjusted, Percent     39.00% 32.00%
Consolidated effective income tax rate (percent)     47.00% (2.00%)
Minimum Tax Credit Carryforwards [Member]        
Schedule Of Income Taxes [Line Items]        
U.S. operationsa 10   $ (21)  
Alternative minimum tax credits, changes to valuation allowances and net loss carryback [Member]        
Schedule Of Income Taxes [Line Items]        
U.S. operationsa   $ (332)   $ (290)
Cerro Verde [Member] | Cerro Verde Royalty Dispute [Member] | Royalty Assessments [Member]        
Schedule Of Income Taxes [Line Items]        
International operations 2   0  
Total (2)      
October 2011 to Tax Year 2013 [Member] | Cerro Verde [Member] | Cerro Verde Royalty Dispute [Member] | Royalty Assessments [Member]        
Schedule Of Income Taxes [Line Items]        
International operations 127   127  
Total (127)      
December 2006 to Tax Year 2013 [Member] | Cerro Verde [Member] | Cerro Verde Royalty Dispute [Member] | Royalty Assessments [Member]        
Schedule Of Income Taxes [Line Items]        
International operations (125)   $ (125)  
Total $ 125