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v2.3.0.11

Inventories (Narrative) (Details) (USD $) In Billions, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2011 | Dec. 31, 2011
Inventories |  |
Inventories provided by customers and suppliers | $ 2.5 | $ 3.3
Decline in Uranium Spot Price Indicator | 16.00% |
Decline in Uranium Quantities Provided by Customers and Suppliers | 11.00% |

X
- Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Decline in Uranium Quantities Provided by Customers and Suppliers + Details
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Namespace Prefix: | usu
Data Type: | num:percentItemType
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- Definition Decline in Uranium Spot Price Indicator + Details
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Namespace Prefix: | usu
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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 + Details
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Namespace Prefix: | usu
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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