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Derivative Instruments and Hedging Activities (Tables)
6 Months Ended
Jun. 30, 2011
Derivative Instruments and Hedging Activities [Abstract]  
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments
                     
Type of
      At June 30
  At December 31
Contract   Balance Sheet Classification   2011   2010
 
Commodity
  Accounts and notes receivable, net     $   68       $   58  
Commodity
  Long-term receivables, net     57       64  
                     
Total Assets at Fair Value     $ 125       $ 122  
                 
Commodity
  Accounts payable     $   70       $ 131  
Commodity
  Deferred credits and other noncurrent obligations     32       40  
                     
Total Liabilities at Fair Value     $ 102       $ 171  
                 
 
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments
                                     
        Gain/(Loss)
    Gain/(Loss)
 
        Three Months Ended
    Six Months Ended
 
Type of
      June 30     June 30  
Contract   Statement of Income Classification   2011     2010     2011     2010  
 
Commodity
  Sales and other operating revenues   $ 75     $ 146     $ (324 )   $ 152  
Commodity
  Purchased crude oil and products     27       5       31       (26 )
Commodity
  Other income           (9 )     (2 )     (9 )
                                     
        $ 102     $ 142     $ (295 )   $ 117