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Inventories
6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Inventories
Inventories

Inventories consisted of the following:

 
Millions of Dollars
 
June 30
2016

 
December 31
2015

 
 
 
 
Crude oil and petroleum products
$
3,725

 
3,214

Materials and supplies
268

 
263

 
$
3,993

 
3,477




Inventories valued on the last-in, first-out (LIFO) basis totaled $3,600 million and $3,085 million at June 30, 2016, and December 31, 2015, respectively. The estimated excess of current replacement cost over LIFO cost of inventories amounted to approximately $3.0 billion and $1.3 billion at June 30, 2016, and December 31, 2015, respectively.

Certain planned year-to-date reductions in inventory caused liquidations of LIFO inventory values that are not expected to be replaced by the end of the year. These liquidations decreased net income by approximately $15 million and $58 million during the three- and six-month periods ending June 30, 2016, and $1 million and $37 million for the comparable periods of 2015.