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Commitment and Contingencies (Details) (USD $) | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2011
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Commitments and Contingencies Disclosure [Abstract] |  |  |  |
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 |  |  |
Minimum additional financing needed for ACP beyond DOE and Japanese | 1,000,000,000 |  |  |
NYSE 30-day average minimum market capitalization | 50,000,000 |  |  |
NYSE Minimum 30 Day Average Closing Price | $ 1.00 |  |  |
NYSE 30-Day Market Capitalization Subject to Suspension | 15,000,000 |  |  |
Stockholders’ Equity (Deficit) | (419,200,000) | (472,900,000) | 642,600,000 | 752,400,000
PBGC estimate of potential Portsmouth pension liability | 130,000,000 |  |  |
Long-Term Debt | $ 530,000,000 | $ 530,000,000 |  |
Minimum Paducah SWU Production Under 2002 DOE-USEC Agreement | 3,500,000 |  |  |

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A3 -Appendix A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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