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Inventories, Net (Details) - USD ($) $ in Millions	Dec. 31, 2020	Sep. 30, 2020
Inventories, Net
Materials and supplies inventory	$ 781	$ 770
Fuel inventory	301	253
Renewable energy certificates/emission allowance inventory, net	17	15
Allowance for inventory obsolescence	(35)	(35)
Inventories, net	$ 1,064	$ 1,003

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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, after of valuation reserves and allowances, of inventory, classified as other, expected to be sold, or consumed within one year or operating cycle, if longer.

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