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Inventories, Net Inventories, Net (Details) - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2018
Inventories, Net
Materials and supplies inventory	$ 742	$ 725
Fuel inventory	294	266
RECs/Emission allowance inventory, net	16	14
Allowance for inventory obsolescence	(53)	(44)
Inventories, net	$ 999	$ 961

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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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