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Inventories	12 Months Ended
Inventories	Dec. 31, 2018
Inventory Disclosure [Abstract]
Inventories	Inventories The cost of approximately 58% and 59% of inventories at December 31, 2018 and 2017, respectively, was determined using the LIFO method. The stated LIFO amounts of inventories were approximately $0.7 billion lower than the current cost of inventories at December 31, 2018 and 2017.