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Concentrations of Credit Risk - SF Risk Characteristics (Details)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serious delinquency: days past due 90 days  
Single-family | Guaranty Book of Business    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30 days delinquent (percentage of book of business) 1.00% 0.98%
60 days delinquent (percentage of book of business) 0.28% 0.24%
Seriously delinquent (percentage of book of business) 0.60% 0.56%
30 days delinquent (percentage of conventional loans) 1.05% 1.06%
60 days delinquent (percentage of conventional loans) 0.29% 0.26%
Seriously delinquent (percentage of conventional loans) 0.56% 0.55%
Single-family | Guaranty Book of Business | California    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent (percentage of conventional loans) 0.41% 0.42%
Percentage of book of business 19.00% 19.00%
Single-family | Guaranty Book of Business | Florida    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent (percentage of conventional loans) 0.96% 0.73%
Percentage of book of business 6.00% 6.00%
Single-family | Guaranty Book of Business | Illinois    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent (percentage of conventional loans) 0.69% 0.70%
Percentage of book of business 3.00% 3.00%
Single-family | Guaranty Book of Business | New York    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent (percentage of conventional loans) 0.79% 0.92%
Percentage of book of business 4.00% 5.00%
Single-family | Guaranty Book of Business | Texas    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent (percentage of conventional loans) 0.73% 0.64%
Percentage of book of business 8.00% 7.00%
Single-family | Guaranty Book of Business | All other states    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent (percentage of conventional loans) 0.51% 0.52%
Percentage of book of business 60.00% 60.00%
Single-family | Guaranty Book of Business | 80.01% to 90%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent (percentage of conventional loans) 0.97% 0.81%
Percentage of book of business 6.00% 5.00%
Single-family | Guaranty Book of Business | 90.01% to 100%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent (percentage of conventional loans) 0.77% 0.59%
Percentage of book of business 3.00% 3.00%
Single-family | Guaranty Book of Business | Greater than 100% (less than)    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent (percentage of conventional loans) 2.82% 2.05%
Percentage of book of business 0.50% 0.50%
Single-family | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serious delinquency: days past due 90 days 90 days