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Income Taxes (Narrative) (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Income Tax Contingency [Line Items]    
Income taxes receivable $ 26,300,000 $ 31,900,000
Net deferred tax assets 2,400,000,000 2,500,000,000
Valuation allowance (2,400,000,000) (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 167,700,000  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 31,700,000  
Possible decrease in unrecognized tax benefits $ 22,200,000  
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