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Fair Value Measurements
9 Months Ended
Sep. 30, 2011
Notes To Financial Statements [Abstract] 
Fair Value Measurements [Text Block]
12.      Fair Value Measurements

As more fully discussed in Note 12 to the Consolidated Financial Statements included in EOG's 2010 Annual Report, certain of EOG's financial and nonfinancial assets and liabilities are reported at fair value on the Consolidated Balance Sheets.  The following table provides fair value measurement information within the fair value hierarchy for certain of EOG's financial assets and liabilities carried at fair value on a recurring basis at September 30, 2011 and December 31, 2010 (in millions):

   
Fair Value Measurements Using:
   
Quoted Prices in Active Markets (Level 1)
 
Significant Other Observable Inputs (Level 2)
       
       
Significant Unobservable Inputs   (Level 3)
   
           
           
         
Total
At September 30, 2011
               
Financial Assets:
               
 
Crude Oil and Natural Gas Price Swaps
$
-
$
215
$
-
$
215
 
Natural Gas Swaptions
 
-
 
211
 
-
 
211
                 
Financial Liabilities:
               
 
Foreign Currency Rate Swap
$
-
$
46
$
-
$
46
 
Interest Rate Swap
 
-
 
5
 
-
 
5
                 
At December 31, 2010
               
Financial Assets:
               
 
Natural Gas Price Swaps
$
-
$
62
$
-
$
62
 
Natural Gas Swaptions
 
-
 
6
 
-
 
6
 
Interest Rate Swap
 
-
 
2
 
-
 
2
                   
Financial Liabilities:
               
 
Crude Oil Price Swaps and Natural Gas Basis Swaps
$
-
$
29
$
-
$
29
 
Foreign Currency Rate Swap
 
-
 
55
 
-
 
55


The estimated fair value of crude oil financial price swap contracts, natural gas financial price swap and basis swap contracts, natural gas swaption contracts and interest rate swap contracts was based upon forward commodity price and interest rate curves based on quoted market prices.  The estimated fair value of the foreign currency rate swap contract was based upon forward currency rates.

The initial measurement of asset retirement obligations at fair value is calculated using discounted cash flow techniques and based on estimates of future retirement costs associated with oil and gas properties and other property, plant and equipment.  Significant Level 3 inputs used in the calculation of asset retirement obligations include plugging costs, reserve lives and useful lives of other property, plant and equipment.  A reconciliation of EOG's asset retirement obligations is presented in Note 7.

Proved oil and gas properties with a carrying amount of $571 million were written down to their fair value of $180 million, resulting in a pretax impairment charge of $391 million for the nine months ended September 30, 2011.  Significant Level 3 assumptions associated with the calculation of discounted cash flows used in the impairment analysis include EOG's estimate of future crude oil and natural gas prices, production costs, development expenditures, anticipated production of proved reserves, appropriate risk-adjusted discount rates and other relevant data.  In connection with certain impairments of proved oil and gas properties and other property, plant and equipment, EOG utilized an accepted offer from a third-party buyer.