|12 Months Ended|
Dec. 31, 2017
Inventories consisted of the following (dollars in millions):
For December 31, 2017 and 2016, approximately 12% and 13% of inventories were recorded using the LIFO cost method, respectively.
The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory.
Reference 1: http://www.xbrl.org/2003/role/presentationRef