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Inventories, Net Inventories, Net (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017
Inventories, Net
Materials and supplies inventory	$ 725	$ 734
Fuel inventory	266	355
RECs/Emission allowance inventory, net	14	15
Allowance for inventory obsolescence	(44)	(39)
Inventories, net	$ 961	$ 1,065

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Carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies relating to a source of usable power held for future sale or future use in manufacturing or production process.

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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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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Amount of valuation reserve for inventory.

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