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Inventories, Net (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021
Inventories, Net
Materials and supplies inventory	$ 792	$ 775
Fuel inventory	257	198
Renewable energy certificates/emission allowance inventory, net	16	12
Allowance for inventory obsolescence	(41)	(35)
Inventories, net	$ 1,024	$ 950

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