v2.4.0.6
Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2011
Cash Flow Information [Abstract]  
Cash payments for interest and income taxes
     2011        2010        2009  
    (millions of dollars)  

Cash payments for interest

   $ 557         $ 703         $ 820   

Cash payments for income taxes

   $ 27,254         $ 18,941         $ 15,427