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Fair Value Accounting (Tables)
9 Months Ended
Sep. 30, 2012
Fair Value Accounting (Tables) [Abstract]  
Fair Value Measurement of Assets and Liabilities
    Fair Value at September 30, 2012 
    Total Level 1 Level 2 Level 3 
 Assets:            
  Cash equivalents  $274 $274 $- $- 
  Marketable equity securities:              
   Extractive industries 1,364  1,364  -  - 
   Other 8  8  -  - 
  Marketable debt securities:            
   Asset backed commercial paper   20  -  -  20 
   Corporate 8  -  8  - 
   Auction rate securities   5  -  -  5 
  Trade receivable from provisional copper             
   and gold concentrate sales, net  237  237  -  - 
  Derivative instruments, net:              
   Foreign exchange forward contracts 256  -  256  - 
   Diesel forward contracts 5  -  5  - 
    $2,177 $1,883 $269 $25 
 Liabilities:            
  Boddington contingent consideration 44  -  -  44 
  Holt property royalty 274  -  -  274 
    $318 $- $- $318 
Changes in the Fair Value of the Company's Level 3 Financial Assets
    Auction Rate Securities Asset Backed Commercial Paper Total Assets Boddington Contingent Royalty Holt Property Royalty Total Liabilities 
 Balance at beginning of period   $5 $19 $24 $54 $176 $230 
  Settlements  -  -  -  (22)  (12)  (34) 
  Revaluation  -  1  1  12  110  122 
 Balance at end of period   $5 $20 $25 $44 $274 $318