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Inventories, Net (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | ---
Inventories, Net |  |
Materials and supplies inventory | $ 824 | $ 808
Fuel inventory | 426 | 303
Renewable energy certificates/emission allowance inventory, net | 19 | 18
Allowance for inventory obsolescence | (62) | (57)
Inventories, net | $ 1,207 | $ 1,072

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