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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 |  |  |

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