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Inventories, Net (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Inventories, Net |  |
Materials and supplies inventory | $ 970 | $ 931
Fuel inventory | 284 | 286
Renewable energy certificates/emission allowance inventory, net | 9 | 11
Allowance for inventory obsolescence | (81) | (73)
Inventories, net | $ 1,182 | $ 1,155

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