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Inventories, Net (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Sep. 30, 2019
--- | --- | ---
Inventories, Net |  |
Materials and supplies inventory | $ 773 | $ 742
Fuel inventory | 328 | 294
Renewable energy certificates/emission allowance inventory, net | 18 | 16
Allowance for inventory obsolescence | (48) | (53)
Inventories, net | $ 1,071 | $ 999

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