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Operating Segments and Geographic Data (Details 1) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Segment Assets    
Goodwill $ 4,654 $ 4,617
Total Assets 201,717 184,769
Upstream [Member]
   
Segment Assets    
Goodwill 4,654 4,617
Total Assets 132,491 120,242
Upstream [Member] | United States [Member]
   
Segment Assets    
Total Assets 35,105 26,319
Upstream [Member] | International [Member]
   
Segment Assets    
Total Assets 92,732 89,306
Downstream [Member]
   
Segment Assets    
Total Assets 46,094 41,965
Downstream [Member] | United States [Member]
   
Segment Assets    
Total Assets 22,228 21,406
Downstream [Member] | International [Member]
   
Segment Assets    
Total Assets 23,866 20,559
Reportable Segment [Member]
   
Segment Assets    
Total Assets 178,585 162,207
All Other Segments [Member]
   
Segment Assets    
Total Assets 23,132 22,562
All Other Segments [Member] | United States [Member]
   
Segment Assets    
Total Assets 8,790 11,125
All Other Segments [Member] | International [Member]
   
Segment Assets    
Total Assets 14,342 11,437
United States [Member]
   
Segment Assets    
Total Assets 66,123 58,850
International [Member]
   
Segment Assets    
Total Assets $ 130,940 $ 121,302