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Inventories, Net Inventories, Net (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Inventories, Net |  |
Materials and supplies inventory | $ 742 | $ 725
Fuel inventory | 294 | 266
RECs/Emission allowance inventory, net | 16 | 14
Allowance for inventory obsolescence | (53) | (44)
Inventories, net | $ 999 | $ 961

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