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Inventories (Narrative) (Details) (USD $) In Billions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Inventory, Net [Abstract]
Inventories provided by customers and suppliers	$ 0.6leu_InventoriesProvidedByCustomersAndSuppliers	$ 1.3leu_InventoriesProvidedByCustomersAndSuppliers
Decline in Uranium Quantities Provided by Customers and Suppliers	52.00%leu_DeclineInUraniumQuantitiesProvidedByCustomersAndSuppliers

X

- Definition

Decline in Uranium Quantities Provided by Customers and Suppliers

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No definition available.

+ Details

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- Definition

Uranium held by USEC to which title was held by customers and suppliers and for which no assets or liabilities were recorded on the balance sheet

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

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- Details

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