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Contingencies and Commitments (Unaudited) (Tables)
3 Months Ended
Mar. 31, 2012
Commitments and Contingencies Disclosure [Abstract]  
Summary of Income Tax Contingencies
The Indonesian tax authorities issued assessments for various audit exceptions on PT Freeport Indonesia's income tax returns as follows (in millions):
Date of assessment
 
Tax return year
 
Tax assessment
 
Interest assessment
 
Total
October 2010
 
2005
 
$
106

 
$
52

 
$
158

November 2011
 
2006
 
22

 
10

 
32

March 2012
 
2007
 
91

 
44

 
135

Total
 
 
 
$
219

 
$
106

 
$
325