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Inventories, Net (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | ---
Inventories, Net |  |
Materials and supplies inventory | $ 758 | $ 734
Fuel inventory | 322 | 355
Renewable energy certificates/emission allowance inventory, net | 12 | 15
Allowance for inventory obsolescence | (45) | (39)
Inventories, net | $ 1,047 | $ 1,065

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