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Subsequent Events (Details) (Subsequent Event [Member], Employee Severance [Member], USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2013 employee | Mar. 31, 2013 Minimum [Member] Scenario, Forecast [Member] | Mar. 31, 2013 Maximum [Member] Scenario, Forecast [Member]
Subsequent Event [Line Items] |  |  |
Workforce reduction, number of employees | 135 |  |
Workforce reduction, number of employees eliminated as a percentage of total workforce (less than 3% as of January, 2013) | 3.00% |  |
Workforce reduction, expected office closure costs and severance related expense |  | $ 8 | $ 13

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- Definition Restructuring and Related Costs, Number of Positions Eliminated, Percentage of Total Workforce + References No definition available. + Details
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- Definition Amount expected to be charged against earnings in the current and future periods for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 146 -Paragraph 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 95-3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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- Definition The number of positions eliminated during the period as a result of restructuring activities. + References No definition available. + Details
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- Details
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