Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) Mill and Leach Stockpiles (Details) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Mill and Leach Stockpiles Inventory [Line Items]
Mill Stockpiles	$ 21		$ 35
Leach stockpiles	1,146		821
Total current mill and leach stockpiles	1,167		856
Mill Stockpiles, Long-term	518	[1]	470	[1]
Leach stockpiles, Long-term	1,081	[1]	955	[1]
Total long-term mill and leach stockpiles	$ 1,599	[1]	$ 1,425	[1]

[1] Metals in stockpiles not expected to be recovered within the next 12 months.