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Financial Guarantees Risk Characteristics - Single-Family (Details) (Single-Family [Member])
Mar. 31, 2013
Dec. 31, 2012
Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of loans with detailed loan level information 99.00% 99.00%
Seriously delinquent, percentage (loan count) 3.02% [1],[2],[3] 3.29% [1],[2],[3]
Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 100% [Member] | Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 13.00% [1],[4] 13.00% [1],[4]
Seriously delinquent, percentage (loan count) 12.83% [1],[2],[5] 13.42% [1],[2],[5]
Arizona | Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 2.00% [1],[4] 2.00% [1],[4]
Seriously delinquent, percentage (loan count) 1.85% [1],[2],[5] 2.14% [1],[2],[5]
California | Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 19.00% [1],[4] 19.00% [1],[4]
Seriously delinquent, percentage (loan count) 1.46% [1],[2],[5] 1.69% [1],[2],[5]
Florida | Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 6.00% [1],[4] 6.00% [1],[4]
Seriously delinquent, percentage (loan count) 9.36% [1],[2],[5] 10.06% [1],[2],[5]
Nevada | Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 1.00% [1],[4] 1.00% [1],[4]
Seriously delinquent, percentage (loan count) 6.01% [1],[2],[5] 6.70% [1],[2],[5]
Select Midwest States [Member] | Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 10.00% [1],[4],[6] 10.00% [1],[4],[6]
Seriously delinquent, percentage (loan count) 3.17% [1],[2],[5],[6] 3.51% [1],[2],[5],[6]
All Other States [Member] | Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 62.00% [1],[4] 62.00% [1],[4]
Seriously delinquent, percentage (loan count) 2.65% [1],[2],[5] 2.85% [1],[2],[5]
Alt-A [Member] | Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 5.00% [1],[4] 6.00% [1],[4]
Seriously delinquent, percentage (loan count) 10.80% [1],[2],[5] 11.36% [1],[2],[5]
Subprime [Member] | Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent, percentage (loan count) 19.49% [1],[2],[5] 20.60% [1],[2],[5]
2005 [Member] | Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 5.00% [1],[4] 5.00% [1],[4]
Seriously delinquent, percentage (loan count) 7.71% [1],[2],[5] 7.79% [1],[2],[5]
2006 [Member] | Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 5.00% [1],[4] 5.00% [1],[4]
Seriously delinquent, percentage (loan count) 11.96% [1],[2],[5] 12.15% [1],[2],[5]
2007 [Member] | Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 6.00% [1],[4] 7.00% [1],[4]
Seriously delinquent, percentage (loan count) 12.71% [1],[2],[5] 12.99% [1],[2],[5]
2008 [Member] | Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 4.00% [1],[4] 5.00% [1],[4]
Seriously delinquent, percentage (loan count) 6.67% [1],[2],[5] 6.63% [1],[2],[5]
All Other Vintages [Member] | Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 80.00% [1],[4] 78.00% [1],[4]
Seriously delinquent, percentage (loan count) 1.25% [1],[2],[5] 1.36% [1],[2],[5]
Original LTV Ratio Greater Than Ninety Percent and FICO Score Less Than Six Hundred Twenty [Member] | Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 1.00% [1],[4] 1.00% [1],[4]
Seriously delinquent, percentage (loan count) 13.14% [1],[2],[5] 14.76% [1],[2],[5]
Maximum [Member] | Subprime [Member] | Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 0.50% 0.50%
Minimum [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serious delinquency, days past due 90 days 90 days
[1] Consists of the portion of our single-family conventional guaranty book of business for which we have detailed loan level information, which constituted approximately 99% of our total single-family conventional guaranty book of business as of March 31, 2013 and December 31, 2012.
[2] Consists of single-family conventional loans that were 90 days or more past due or in the foreclosure process, as of March 31, 2013 and December 31, 2012.
[3] Calculated based on the number of single-family conventional loans that were delinquent divided by the total number of loans in our single-family conventional guaranty book of business.
[4] Calculated based on the aggregate unpaid principal balance of single-family conventional loans for each category divided by the aggregate unpaid principal balance of loans in our single-family conventional guaranty book of business.
[5] Calculated based on the number of single-family conventional loans that were seriously delinquent divided by the total number of single-family conventional loans for each category included in our guaranty book of business.
[6] Consists of Illinois, Indiana, Michigan, and Ohio.