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Inventories, Net (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Inventories, Net |  |
Materials and supplies inventory | $ 776 | $ 775
Fuel inventory | 245 | 198
Renewable energy certificates/emission allowance inventory, net | 17 | 12
Allowance for inventory obsolescence | (50) | (35)
Inventories, net | $ 988 | $ 950

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