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Inventories, Net Inventories, Net (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Inventories, Net |  |
Materials and supplies inventory | $ 849 | $ 808
Fuel inventory | 313 | 303
Renewable energy certificates/emissions allowance inventory, net | 15 | 18
Allowance for inventory obsolescence | (69) | (57)
Inventories, net | $ 1,108 | $ 1,072

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