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Capitalized Exploratory Well Costs (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Capitalized Exploratory Well Costs [Abstract]  
Capitalized Exploratory Well Costs, Beginning of Period$ 466 
Additions to Capitalized Exploratory Well Costs Pending Determination of Proved Reserves158 
Reclassified to Proved Oil and Gas Properties Based on Determination of Proved Reserves(55)[1] 
Capitalized Exploratory Well Costs Charged to Expense(15) 
Capitalized Exploratory Well Costs, End of Period554 
Flynde project in the North Sea, reclassification to well, facilities, and equipment based on determination of proved reserves13 
Exploratory Well Costs Capitalized for a Period of One Year or Less196166
Exploratory Well Costs Capitalized for a Period Greater Than One Year After Completion of Drilling358300
Balance at End of Period554 
Number of Projects with Exploratory Well Costs That Have Been Capitalized for a Period Greater Than One Year After Completion of Drilling109
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]  
Suspended Since 201076 
Suspended Since 200970 
Suspended Since 2008 & Prior212 
Total358300
Blocks O And I Offshore Equatorial Guinea [Member]
  
Capitalized Exploratory Well Costs [Abstract]  
Exploratory Well Costs Capitalized for a Period Greater Than One Year After Completion of Drilling113 
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]  
Suspended Since 20107 
Suspended Since 200919 
Suspended Since 2008 & Prior87 
Total113 
YoYo Offshore Cameroon [Member]
  
Capitalized Exploratory Well Costs [Abstract]  
Exploratory Well Costs Capitalized for a Period Greater Than One Year After Completion of Drilling39 
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]  
Suspended Since 20101 
Suspended Since 20092 
Suspended Since 2008 & Prior36 
Total39 
Dalit Offshore Israel [Member]
  
Capitalized Exploratory Well Costs [Abstract]  
Exploratory Well Costs Capitalized for a Period Greater Than One Year After Completion of Drilling22 
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]  
Suspended Since 20101 
Suspended Since 200921 
Suspended Since 2008 & Prior0 
Total22 
Deep Blue Deepwater Gulf of Mexico [Member]
  
Capitalized Exploratory Well Costs [Abstract]  
Exploratory Well Costs Capitalized for a Period Greater Than One Year After Completion of Drilling73 
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]  
Suspended Since 201054 
Suspended Since 200919 
Suspended Since 2008 & Prior0 
Total73 
Gunflint Deepwater Gulf Of Mexico [Member]
  
Capitalized Exploratory Well Costs [Abstract]  
Exploratory Well Costs Capitalized for a Period Greater Than One Year After Completion of Drilling58 
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]  
Suspended Since 20102 
Suspended Since 20096 
Suspended Since 2008 & Prior50 
Total58 
Redrock Deepwater Gulf Of Mexico [Member]
  
Capitalized Exploratory Well Costs [Abstract]  
Exploratory Well Costs Capitalized for a Period Greater Than One Year After Completion of Drilling21 
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]  
Suspended Since 20101 
Suspended Since 20092 
Suspended Since 2008 & Prior18 
Total21 
Selkirk North Sea [Member]
  
Capitalized Exploratory Well Costs [Abstract]  
Exploratory Well Costs Capitalized for a Period Greater Than One Year After Completion of Drilling23 
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]  
Suspended Since 20101 
Suspended Since 20091 
Suspended Since 2008 & Prior21 
Total23 
Other Projects [Member]
  
Capitalized Exploratory Well Costs [Abstract]  
Exploratory Well Costs Capitalized for a Period Greater Than One Year After Completion of Drilling9 
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]  
Suspended Since 20109 
Suspended Since 20090 
Suspended Since 2008 & Prior0 
Total$ 9 
[1]Includes $13 million related to the Flyndre project in the North Sea.