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Cash Flow Information
9 Months Ended
Sep. 30, 2012
Cash Flow Information [Abstract]  
Cash Flow Information
Note 17—Cash Flow Information     
      
 Millions of Dollars 
 Nine Months Ended 
September 30
  2012 2011 
Cash Payments     
Interest$ 596  739 
Income taxes  6,394  7,145 
      
Net Sales (Purchases) of Short-Term Investments     
Short-term investments purchased$ (497)  (6,642) 
Short-term investments sold  1,094  5,019 
 $ 597  (1,623)