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Income Taxes (Narrative) (Details) (USD $)
9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Income Tax Contingency [Line Items]    
Deferred Tax Assets, Gross $ 2,300,000,000 $ 2,500,000,000
Deferred tax assets, net 2,108,756,000 0
Valuation allowance (231,000,000) (2,500,000,000)
Section 382 limitations on use of pre-ownership Centex losses per year 67,400,000  
Period in which to recognize Section 382 limitations on use of pre-ownership Centex losses, months 60 months  
Gross unrecognized tax benefits 165,900,000  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 31,000,000  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 32,900,000  
Possible decrease in unrecognized tax benefits $ 130,000,000  
Minimum [Member]
   
Income Tax Contingency [Line Items]    
Income Tax Examination, Year under Examination 2003  
Maximum [Member]
   
Income Tax Contingency [Line Items]    
Income Tax Examination, Year under Examination 2013