Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017
Inventory, Net [Abstract]
Finished products	$ 189	$ 180
Raw materials, supplies and work in process	30	31
Reserve for LIFO cost valuation	(40)	(33)
Excess and obsolete inventory reserves	(3)	(3)
Inventories	176	175
Lubricants
Inventory [Line Items]
Replacement cost	$ 89	$ 83

Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of valuation reserve for inventory.

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The aggregate carrying amount as of the balance sheet date of items held by the entity which are partially completed at the time of measurement and unprocessed items that will go through the production process and become part of the final product. Includes supplies used directly or indirectly in the manufacturing or production process. This element may be used when the reporting entity combines work in process and raw materials into an aggregate amount.

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The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

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