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Inventories
12 Months Ended
Dec. 31, 2013
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories are carried at the lower of cost or market value. The LIFO method accounted for 4 percent and 6 percent of total inventory value at December 31, 2013 and 2012. Current acquisition costs were estimated to exceed the LIFO inventory value at December 31, 2013 and 2012 by $32 million and $29 million.
 
December 31,
(In millions)
2013
 
2012
Liquid hydrocarbons, natural gas and bitumen
$
55

 
$
73

Supplies and other items
309

 
288

Inventories at cost
$
364

 
$
361