Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Components of Inventories [Line Items]
Total current mill and leach stockpiles		$ 1,348		$ 1,348		$ 1,539
Total materials and supplies, net	[1]	1,338		1,338		1,594
Raw materials (primarily concentrate)		222		222		220
Work-in-process		93		93		108
Finished goods		743		743		743
Total product inventories		1,058		1,058		1,071
Total long-term mill and leach stockpiles		1,742		1,742		1,663
Inventory obsolescence reserves		29		29		26
Mining inventory adjustments		2	$ 59	7	$ 63
Current [Member]
Components of Inventories [Line Items]
Mill stockpiles		146		146		137
Leach stockpiles		1,202		1,202		1,402
Total current mill and leach stockpiles		1,348		1,348		1,539
Long-Term [Member]
Components of Inventories [Line Items]
Mill stockpiles		584		584		480
Leach stockpiles		1,158		1,158		1,183
Total long-term mill and leach stockpiles	[2]	$ 1,742		$ 1,742		$ 1,663

[1] Materials and supplies inventory was net of obsolescence reserves totaling $29 million at June 30, 2016, and $26 million at December 31, 2015.

[2] Estimated metals in stockpiles not expected to be recovered within the next 12 months.