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Capitalized Exploratory Well Costs (Tables)
9 Months Ended
Sep. 30, 2011
Capitalized Exploratory Well Costs [Abstract] 
Changes in Capitalized Exploratory Well Costs
Changes in capitalized exploratory well costs are as follows and exclude amounts that were capitalized and subsequently expensed in the same period:
 
 Nine Months Ended
September 30,
 
(millions)
   
Capitalized Exploratory Well Costs, Beginning of Period
 $466 
Additions to Capitalized Exploratory Well Costs Pending Determination of Proved Reserves
  158 
Reclassified to Proved Oil and Gas Properties Based on Determination of Proved Reserves (1)
  (55)
Capitalized Exploratory Well Costs Charged to Expense
  (15)
Capitalized Exploratory Well Costs, End of Period
 $554 
 
(1)  Includes $13 million related to the Flyndre project in the North Sea.
Aging of Capitalized Well Costs
The following table provides an aging of capitalized exploratory well costs (suspended well costs) based on the date the drilling was completed and the number of projects for which exploratory well costs have been capitalized for a period greater than one year since the completion of drilling:
 
   
September 30,
  
December 31,
 
   
2011
   2010 
(millions)
       
Exploratory Well Costs Capitalized for a Period of One Year or Less
 $196  $166 
Exploratory Well Costs Capitalized for a Period Greater Than One Year After Completion of Drilling
  358   300 
Balance at End of Period
 $554  $466 
Number of Projects with Exploratory Well Costs That Have Been Capitalized for a Period Greater Than One Year After Completion of Drilling
  10   9 
Aging of Exploratory Well Costs
The following table provides a further aging of those exploratory well costs that have been capitalized for a period greater than one year since the completion of drilling as of September 30, 2011:
 
      
Suspended Since
 
   
Total
  
2010
  
2009
  
2008 & Prior
 
(millions)
            
Country/Project
            
Offshore Equatorial Guinea
            
Blocks O and I
 $113  $7  $19  $87 
Offshore Cameroon
                
YoYo
  39   1   2   36 
Offshore Israel
                
Dalit
  22   1   21   - 
Deepwater Gulf of Mexico
                
Deep Blue
  73   54   19   - 
Gunflint
  58   2   6   50 
Redrock
  21   1   2   18 
North Sea
                
Selkirk
  23   1   1   21 
Other
                
3 projects of $10 million or less each
  9   9   -   - 
Total
 $358  $76  $70  $212