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Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Components of Inventories [Line Items] |  |  |  |  |  |
Total materials and supplies, net | [1] | $ 1,348 |  | $ 1,348 |  | $ 1,594
Total current mill and leach stockpiles |  | 1,312 |  | 1,312 |  | 1,539
Raw materials (primarily concentrate) |  | 209 |  | 209 |  | 220
Work-in-process |  | 94 |  | 94 |  | 108
Finished goods |  | 722 |  | 722 |  | 743
Total product inventories |  | 1,025 |  | 1,025 |  | 1,071
Total long-term mill and leach stockpiles |  | 1,723 |  | 1,723 |  | 1,663
Inventory obsolescence reserves |  | 31 |  | 31 |  | 26
Mining inventory adjustments |  | (20) | $ (91) | (27) | $ (154) |
Current [Member] |  |  |  |  |  |
Components of Inventories [Line Items] |  |  |  |  |  |
Mill stockpiles |  | 172 |  | 172 |  | 137
Leach stockpiles |  | 1,140 |  | 1,140 |  | 1,402
Total current mill and leach stockpiles |  | 1,312 |  | 1,312 |  | 1,539
Long-Term [Member] |  |  |  |  |  |
Components of Inventories [Line Items] |  |  |  |  |  |
Mill stockpiles |  | 580 |  | 580 |  | 480
Leach stockpiles |  | 1,143 |  | 1,143 |  | 1,183
Total long-term mill and leach stockpiles | [2] | $ 1,723 |  | $ 1,723 |  | $ 1,663
[1] | Materials and supplies inventory was net of obsolescence reserves totaling $31 million at September 30, 2016, and $26 million at December 31, 2015.
[2] | Estimated metals in stockpiles not expected to be recovered within the next 12 months.

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