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Commitments and Contingencies (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended 24 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Dec. 31, 2007
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]                
Total Mortgage Loans Originated     $ 39,500,000,000          
Percentage of loan origination repurchase requests in which Company is able to cure or refute the claim   60.00%            
Actual Loss Severities Percentage on Mortgage Repurchase Requests   50.00%            
Loss Contingencies [Line Items]                
Letters of Credit Outstanding, Amount 178,100,000 178,100,000     179,200,000      
Surety Bonds Outstanding 1,000,000,000 1,000,000,000     1,000,000,000      
Litigation Settlement, Expense 8,000,000 38,000,000            
Maximum product warranty in years   10 years            
Number of self-insurance claims managed at any one time 1,000 1,000            
Self-insurance liabilities 691,598,000 691,598,000   708,142,000 721,284,000 723,826,000 733,042,000 739,029,000
Incurred but not reported percentage of liability reserves 77.00% 77.00%            
Residential mortgage backed securities known [Member]
                
Loss Contingencies [Line Items]                
Residential mortgage-backed securities principal sold in previous period 162,000,000 162,000,000            
Residential mortgage backed securities other [Member]
                
Loss Contingencies [Line Items]                
Residential mortgage-backed securities principal sold in previous period $ 116,000,000 $ 116,000,000