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Financial Guarantees Risk Characteristics - Single-Family (Details) (Single-Family [Member])
Sep. 30, 2012
Dec. 31, 2011
Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent, percentage (loan count) 3.41% [1],[2],[3] 3.91% [1],[2],[3]
Percentage of loans with detailed loan level information 99.00% 99.00%
Guaranty Book of Business [Member] | Conventional Loan [Member] | 2005 [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) 7.54% [1],[2],[5] 7.27% [1],[2],[5]
Guaranty Book of Business [Member] | Conventional Loan [Member] | 2006 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 5.00% [1],[4] 7.00% [1],[4]
Seriously delinquent, percentage (loan count) 11.87% [1],[2],[5] 11.81% [1],[2],[5]
Guaranty Book of Business [Member] | Conventional Loan [Member] | 2007 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 8.00% [1],[4] 10.00% [1],[4]
Seriously delinquent, percentage (loan count) 12.66% [1],[2],[5] 12.62% [1],[2],[5]
Guaranty Book of Business [Member] | Conventional Loan [Member] | 2008 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 5.00% [1],[4] 7.00% [1],[4]
Seriously delinquent, percentage (loan count) 6.26% [1],[2],[5] 5.64% [1],[2],[5]
Guaranty Book of Business [Member] | Conventional Loan [Member] | All Other Vintages [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 76.00% [1],[4] 69.00% [1],[4]
Seriously delinquent, percentage (loan count) 1.40% [1],[2],[5] 1.59% [1],[2],[5]
Guaranty Book of Business [Member] | Conventional Loan [Member] | Alt-A [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) 11.61% [1],[2],[5] 12.43% [1],[2],[5]
Guaranty Book of Business [Member] | Conventional Loan [Member] | Subprime [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent, percentage (loan count) 20.85% [1],[2],[5] 23.18% [1],[2],[5]
Guaranty Book of Business [Member] | Conventional Loan [Member] | Arizona
   
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) 2.35% [1],[2],[5] 3.65% [1],[2],[5]
Guaranty Book of Business [Member] | Conventional Loan [Member] | California
   
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) 1.89% [1],[2],[5] 2.46% [1],[2],[5]
Guaranty Book of Business [Member] | Conventional Loan [Member] | Florida
   
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) 10.49% [1],[2],[5] 11.80% [1],[2],[5]
Guaranty Book of Business [Member] | Conventional Loan [Member] | Nevada
   
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) 6.97% [1],[2],[5] 7.42% [1],[2],[5]
Guaranty Book of Business [Member] | Conventional Loan [Member] | Select Midwest States [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) 3.66% [1],[2],[5],[6] 4.39% [1],[2],[5],[6]
Guaranty Book of Business [Member] | Conventional Loan [Member] | All Other States [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) 2.89% [1],[2],[5] 3.18% [1],[2],[5]
Guaranty Book of Business [Member] | Conventional Loan [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 100% [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 14.00% [1],[4] 18.00% [1],[4]
Seriously delinquent, percentage (loan count) 13.53% [1],[2],[5] 13.76% [1],[2],[5]
Maximum [Member] | Guaranty Book of Business [Member] | Conventional Loan [Member] | Subprime [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 0.50% [1],[4],[7] 0.50% [1],[4],[7]
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 September 30, 2012 and December 31, 2011.
[2] Consists of single-family conventional loans that were 90 days or more past due or in the foreclosure process, as of September 30, 2012 and December 31, 2011.
[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.
[7] Represents less than 0.5% of the single-family conventional guaranty book of business.