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Inventories, Net Inventories, Net (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
--- | --- | ---
Inventories, Net |  |
Materials and supplies inventory | $ 620 | $ 605
Fuel inventory | 494 | 508
Emission allowance inventory | 14 | 12
Allowance for inventory obsolescence | (37) | (28)
Inventories, net | $ 1,091 | $ 1,097

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