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Inventories, Net (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Sep. 30, 2012
Inventories, Net
Materials and supplies inventory	$ 621	$ 605
Fuel inventory	563	508
Emission allowance inventory	14	12
Allowance for inventory obsolescence	(34)	(28)
Inventories, net	$ 1,164	$ 1,097

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Carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies relating to a source of usable power held for future sale or future use in manufacturing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Amount of valuation reserve for inventory.

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