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Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Components of Inventories [Line Items] |  |  |
Total materials and supplies, net | [1] | $ 1,714 | $ 1,869
Total mill and leach stockpiles |  | 1,644 | 1,724
Raw materials (primarily concentrate) |  | 247 | 220
Work-in-process |  | 118 | 108
Finished goods |  | 805 | 867
Total product inventories |  | 1,170 | 1,195
Total long-term mill and leach stockpiles |  | 2,324 | 2,271
Inventory obsolescence reserves |  | 28 | 29
Current [Member] |  |  |
Components of Inventories [Line Items] |  |  |
Mill stockpiles |  | 139 | 137
Leach stockpiles |  | 1,505 | 1,587
Total mill and leach stockpiles |  | 1,644 | 1,724
Long-Term [Member] |  |  |
Components of Inventories [Line Items] |  |  |
Mill stockpiles |  | 521 | 480
Leach stockpiles |  | 1,803 | 1,791
Total long-term mill and leach stockpiles | [2] | $ 2,324 | $ 2,271
[1] | Materials and supplies inventory was net of obsolescence reserves totaling $28 million at March 31, 2016, and $29 million at December 31, 2015.
[2] | Estimated metals in stockpiles not expected to be recovered within the next 12 months.

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