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Capitalized Exploratory Well Costs (Details 2) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year $ 733 $ 545 $ 378
Suspended Since 2011 and 2012
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 498    
Suspended Since 2009 and 2010
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 115    
Suspended Since 2008 and Prior
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 120    
Diega Offshore Equatorial Guinea [Member]
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 108    
Diega Offshore Equatorial Guinea [Member] | Suspended Since 2011 and 2012
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 43    
Diega Offshore Equatorial Guinea [Member] | Suspended Since 2009 and 2010
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 23    
Diega Offshore Equatorial Guinea [Member] | Suspended Since 2008 and Prior
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 42    
Carla Offshore Equatorial Guinea [Member]
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 44    
Carla Offshore Equatorial Guinea [Member] | Suspended Since 2011 and 2012
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 44    
Carla Offshore Equatorial Guinea [Member] | Suspended Since 2009 and 2010
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 0    
Carla Offshore Equatorial Guinea [Member] | Suspended Since 2008 and Prior
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 0    
Felicita Offshore Equatorial Guinea [Member]
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 37    
Felicita Offshore Equatorial Guinea [Member] | Suspended Since 2011 and 2012
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 2    
Felicita Offshore Equatorial Guinea [Member] | Suspended Since 2009 and 2010
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 6    
Felicita Offshore Equatorial Guinea [Member] | Suspended Since 2008 and Prior
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 29    
Yolanda Offshore Equatorial Guinea [Member]
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 19    
Yolanda Offshore Equatorial Guinea [Member] | Suspended Since 2011 and 2012
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 1    
Yolanda Offshore Equatorial Guinea [Member] | Suspended Since 2009 and 2010
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 3    
Yolanda Offshore Equatorial Guinea [Member] | Suspended Since 2008 and Prior
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 15    
YoYo Offshore Cameron [Member]
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 47    
YoYo Offshore Cameron [Member] | Suspended Since 2011 and 2012
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 5    
YoYo Offshore Cameron [Member] | Suspended Since 2009 and 2010
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 8    
YoYo Offshore Cameron [Member] | Suspended Since 2008 and Prior
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 34    
Leviathan [Member]
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 144    
Leviathan [Member] | Suspended Since 2011 and 2012
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 97    
Leviathan [Member] | Suspended Since 2009 and 2010
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 47    
Leviathan [Member] | Suspended Since 2008 and Prior
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 0    
Leviathan-1 Deep Offshore Israel [Member]
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 73    
Leviathan-1 Deep Offshore Israel [Member] | Suspended Since 2011 and 2012
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 73    
Leviathan-1 Deep Offshore Israel [Member] | Suspended Since 2009 and 2010
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 0    
Leviathan-1 Deep Offshore Israel [Member] | Suspended Since 2008 and Prior
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 0    
Dalit Israel [Member]
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 24    
Dalit Israel [Member] | Suspended Since 2011 and 2012
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 1    
Dalit Israel [Member] | Suspended Since 2009 and 2010
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 23    
Dalit Israel [Member] | Suspended Since 2008 and Prior
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 0    
Tanin 1 Offshore Israel [Member]
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 34    
Tanin 1 Offshore Israel [Member] | Suspended Since 2011 and 2012
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 34    
Tanin 1 Offshore Israel [Member] | Suspended Since 2009 and 2010
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 0    
Tanin 1 Offshore Israel [Member] | Suspended Since 2008 and Prior
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 0    
Dolphin 1 Offshore Israel [Member]
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 23    
Dolphin 1 Offshore Israel [Member] | Suspended Since 2011 and 2012
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 23    
Dolphin 1 Offshore Israel [Member] | Suspended Since 2009 and 2010
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 0    
Dolphin 1 Offshore Israel [Member] | Suspended Since 2008 and Prior
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 0    
Cyprus A-1 Offshore Cyprus [Member]
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 74    
Cyprus A-1 Offshore Cyprus [Member] | Suspended Since 2011 and 2012
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 74    
Cyprus A-1 Offshore Cyprus [Member] | Suspended Since 2009 and 2010
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 0    
Cyprus A-1 Offshore Cyprus [Member] | Suspended Since 2008 and Prior
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 0    
Scotia Falkland Islands [Member]
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 72    
Scotia Falkland Islands [Member] | Suspended Since 2011 and 2012
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 72    
Scotia Falkland Islands [Member] | Suspended Since 2009 and 2010
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 0    
Scotia Falkland Islands [Member] | Suspended Since 2008 and Prior
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 0    
Other Projects [Member]
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 34    
Other Projects [Member] | Suspended Since 2011 and 2012
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 29    
Other Projects [Member] | Suspended Since 2009 and 2010
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year 5    
Other Projects [Member] | Suspended Since 2008 and Prior
      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year $ 0