XML 24 R52.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Commitment and Contingencies (Details) (USD $) | 9 Months Ended
--- | ---
Sep. 30, 2012
Commitments and Contingencies |
Minimum Power Purchase Obligation | $ 500,000,000
Amount of application under DOE Loan Guarantee Program | 2,000,000,000
Potential financing from Japanese export credit agencies under discussion | 1,000,000,000
Upper range of potential ACP asset impairment expense | 1,100,000,000
Maximum royalty under commercial Centrifuge IP license | 665,000,000
Total estimated cost of RD&D Program | 350,000,000
DOE share of RD&D Program | 280,000,000
USEC share of RD&D Program | 70,000,000
DOE initial funding of RD&D Program | 87,700,000
Annual rate of RD&D Program funding approved by government | 100,000,000
RD&D Program funding expected in next six months | 45,720,000
Potential ERISA Section 4062(e) pension liabililty | $ 100,000,000

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

X
- Definition Amount of application under DOE Loan Guarantee Program + References No definition available. + Details
Name: | usu_AmountOfApplicationUnderDoeLoanGuaranteeProgram
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Annual rate of RD&D Program funding approved by government + References No definition available. + Details
Name: | usu_AnnualRateOfRdDProgramFundingApprovedByGovernment
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition DOE initial funding of RD&D Program + References No definition available. + Details
Name: | usu_DoeInitialFundingOfRdDProgram
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition DOE share of RD&D Program + References No definition available. + Details
Name: | usu_DoeShareOfRdDProgram
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Maximum royalty under commercial Centrifuge IP license + References No definition available. + Details
Name: | usu_MaximumRoyaltyUnderCommercialCentrifugeIpLicense
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Minimum Power Purchase Obligation + References No definition available. + Details
Name: | usu_MinimumPowerPurchaseObligation
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Potential ERISA Section 4062(e) pension liabililty for USEC and DOE + References No definition available. + Details
Name: | usu_PotentialErisaSection4062EPensionLiabililty
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Potential financing from Japanese export credit agencies under discussion + References No definition available. + Details
Name: | usu_PotentialFinancingFromExportCreditAgenciesUnderDiscussion
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition RD&D Program funding expected in next six months + References No definition available. + Details
Name: | usu_RdDProgramFundingExpectedInNextSixMonths
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total estimated cost of RD&D Program + References No definition available. + Details
Name: | usu_TotalEstimatedCostOfRdDProgram
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Upper range of potential ACP asset impairment expense + References No definition available. + Details
Name: | usu_UpperRangeOfPotentialAcpAssetImpairmentExpense
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition USEC share of RD&D Program + References No definition available. + Details
Name: | usu_UsecShareOfRdDProgram
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant