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Inventories, Net (Details) - USD ($) $ in Millions	Dec. 31, 2015	Sep. 30, 2015
Inventories, Net
Materials and supplies inventory	$ 685	$ 651
Fuel inventory	499	414
Emission allowance inventory, net	15	13
Allowance for inventory obsolescence	(53)	(47)
Inventories, net	$ 1,146	$ 1,031

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- Definition

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.

+ References

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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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Carrying amount, net of valuation reserves and allowances, as of the balance sheet date of inventories not otherwise specified in the taxonomy.

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