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Inventories, Net (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | ---
Inventories, Net |  |
Materials and supplies inventory | $ 781 | $ 770
Fuel inventory | 301 | 253
Renewable energy certificates/emission allowance inventory, net | 17 | 15
Allowance for inventory obsolescence | (35) | (35)
Inventories, net | $ 1,064 | $ 1,003

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