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Inventories, Net (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013
Inventories, Net
Materials and supplies inventory	$ 622	$ 620
Fuel inventory	553	494
Emission allowance inventory	16	14
Allowance for inventory obsolescence	(38)	(37)
Inventories, net	$ 1,153	$ 1,091

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

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