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Inventories, Net (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014
Inventories, Net
Materials and supplies inventory	$ 621us-gaap_InventoryRawMaterialsAndSupplies	$ 616us-gaap_InventoryRawMaterialsAndSupplies
Fuel inventory	536us-gaap_EnergyRelatedInventory	473us-gaap_EnergyRelatedInventory
Emission allowance inventory	15us-gaap_OtherInventory	13us-gaap_OtherInventory
Allowance for inventory obsolescence	(42)us-gaap_InventoryValuationReserves	(46)us-gaap_InventoryValuationReserves
Inventories, net	$ 1,130us-gaap_InventoryNet	$ 1,056us-gaap_InventoryNet

X

- 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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X

- Definition

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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X

- Definition

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

+ References

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X

- Definition

Amount of valuation reserve for inventory.

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

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