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Capitalized Exploratory Well Costs (Tables)
 3 Months Ended
Mar. 31, 2012
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:
 
   Three Months Ended
March 31, 2012
 
(millions)
       
Capitalized Exploratory Well Costs, Beginning of Period
  $
696
 
Additions to Capitalized Exploratory Well Costs Pending Determination of Proved Reserves
   
        93
 
Reclassified to Proved Oil and Gas Properties Based on Determination of Proved Reserves
   
           -
 
Capitalized Exploratory Well Costs Charged to Expense
   
           -
 
Capitalized Exploratory Well Costs, End of Period
 
$
789
 
 
Aging of Capitalized Well Costs
The following table provides an aging of capitalized exploratory well costs based on the date that drilling commenced, and the number of projects that have been capitalized for a period greater than one year:
 
   
March 31,
  
December 31,
 
 
 
2012
  
2011
 
(millions)
 
 
    
Exploratory Well Costs Capitalized for a Period of One Year or Less
 $345  $318 
Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling
  444   378 
Balance at End of Period
 $789  $696 
Number of Projects with Exploratory Well Costs That Have Been Capitalized for a Period Greater Than One Year Since Commencement 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 commencement of drilling as of March 31, 2012:

 
 
 
  
Suspended Since
 
 
 
Total
  
2011
  
2010
  
2009 &
Prior
 
(millions)
 
 
  
 
  
 
  
 
 
Country/Project
 
 
  
 
  
 
  
 
 
Offshore Equatorial Guinea
 
 
  
 
  
 
  
 
 
Blocks O and I
 $114  $2  $6  $106 
Offshore Cameroon
                
YoYo
  41   1   2   38 
Offshore Israel
                
Leviathan
  86   45   41   - 
Dalit
  22   -   1   21 
Deepwater Gulf of Mexico
                
Gunflint
  70   11   3   56 
Deep Blue
  75   2   54   19 
North Sea
                
Selkirk
  22   -   1   21 
Other
                
3 projects of $10 million or less each
  14   6   8   - 
Total
 $444  $67  $116  $261