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General Information (Unaudited) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | --- | ---
Property, plant, equipment and mine development costs, net | $ 22,923 | $ 22,934 |
Deferred income taxes | 3,702 | 3,649 |
Assets held for sale | 625 | 508 | $ 373
Liabilities held for sale | $ 353 | 323 |
Restatement Adjustment [Member] | Kisanfu Exploration Project [Member] |  |  |
Property, plant, equipment and mine development costs, net |  | 90 |
Deferred income taxes |  | 27 |
Assets held for sale |  | (90) |
Liabilities held for sale |  | $ (27) |

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