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Inventories, Net (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Inventories, Net |  |
Materials and supplies inventory | $ 926 | $ 849
Fuel inventory | 328 | 313
Renewable energy certificates/emission allowance inventory, net | 12 | 15
Allowance for inventory obsolescence | (75) | (69)
Inventories, net | $ 1,191 | $ 1,108

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