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Inventories, Net (Details) - USD ($) $ in Millions	Jun. 30, 2022	Sep. 30, 2021
Inventories, Net
Materials and supplies inventory	$ 804	$ 775
Fuel inventory	246	198
Renewable energy certificates/emission allowance inventory, net	18	12
Allowance for inventory obsolescence	(55)	(35)
Inventories, net	$ 1,013	$ 950

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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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