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Inventories
6 Months Ended
Jun. 30, 2013
Inventories [Abstract]  
Inventories
Note 5—Inventories    
     
Inventories consisted of the following:    
     
 Millions of Dollars
 June 30  December 31
  2013 2012
     
Crude oil and petroleum products$ 392  244
Materials, supplies and other  742  721
 $ 1,134  965

Inventories valued on the last-in, first-out (LIFO) basis totaled $252 million and $147 million at June 30, 2013, and December 31, 2012, respectively. The estimated excess of current replacement cost over LIFO cost of inventories was approximately $168 million at June 30, 2013, and $200 million at December 31, 2012.