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Inventories
9 Months Ended
Sep. 30, 2018
Inventories [Abstract]  
Inventories
Note 4—Inventories
Inventories consisted of the following:
Millions of Dollars
September 30 December 31
20182017
Crude oil and natural gas$673512
Materials and supplies566548
$1,2391,060

Inventories valued on the last-in, first-out (LIFO) basis totaled $283 million and $341 million at September 30, 2018 and December 31, 2017, respectively. The estimated excess of current replacement cost over LIFO cost of inventories was $100 million and $124 million at September 30, 2018 and December 31, 2017, respectively.

As of September 30, 2018, crude oil and natural gas inventory includes $139 million of inventory received as part of a settlement agreement reached with Petróleos de Venezuela, S.A. (PDVSA) under an International Chamber of Commerce arbitration award. As of the end of October 2018, substantially all of the inventory recognized during the third quarter related to this settlement has been sold. For information about the settlement, see Note 13Contingencies and Commitments.