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Inventories, Net (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Inventories, Net
Materials and supplies inventory	$ 811	$ 808
Fuel inventory	414	303
Renewable energy certificates/emission allowance inventory, net	19	18
Allowance for inventory obsolescence	(64)	(57)
Inventories, net	$ 1,180	$ 1,072

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

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