Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) Mill and Leach Stockpiles (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Mill and Leach Stockpiles [Line Items]
Current mill and leach stockpiles	$ 1,698		$ 1,672
Total long-term mill and leach stockpiles	2,081		1,955
Current [Member]
Mill and Leach Stockpiles [Line Items]
Mill Stockpiles	112		104
Leach stockpiles	1,586		1,568
Current mill and leach stockpiles	1,698		1,672
Long-Term [Member]
Mill and Leach Stockpiles [Line Items]
Mill Stockpiles	627	[1]	615	[1]
Leach stockpiles	1,454	[1]	1,340	[1]
Total long-term mill and leach stockpiles	$ 2,081	[1]	$ 1,955	[1]

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