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Financial Guarantees Risk Characteristics - Single-Family (Details) (Single-Family [Member])
Mar. 31, 2014
Dec. 31, 2013
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) 2.19% [1],[2],[3] 2.38% [1],[2],[3]
2005 [Member] | Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 3.00% [1],[4] 4.00% [1],[4]
Seriously delinquent, percentage (loan count) 6.81% [1],[2],[5] 7.26% [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 3.00% [1],[4] 3.00% [1],[4]
Seriously delinquent, percentage (loan count) 10.58% [1],[2],[5] 11.26% [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 5.00% [1],[4] 5.00% [1],[4]
Seriously delinquent, percentage (loan count) 11.53% [1],[2],[5] 12.18% [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 3.00% [1],[4] 3.00% [1],[4]
Seriously delinquent, percentage (loan count) 6.40% [1],[2],[5] 6.69% [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 86.00% [1],[4] 85.00% [1],[4]
Seriously delinquent, percentage (loan count) 0.96% [1],[2],[5] 1.02% [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] 5.00% [1],[4]
Seriously delinquent, percentage (loan count) 8.72% [1],[2],[5] 9.23% [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) 16.17% [1],[2],[5] 16.93% [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 20.00% [1],[4] 20.00% [1],[4]
Seriously delinquent, percentage (loan count) 0.86% [1],[2],[5] 0.98% [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) 6.12% [1],[2],[5] 6.89% [1],[2],[5]
Illinois | 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] 4.00% [1],[4]
Seriously delinquent, percentage (loan count) 2.79% [1],[2],[5] 3.12% [1],[2],[5]
New Jersey | 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] 4.00% [1],[4]
Seriously delinquent, percentage (loan count) 6.08% [1],[2],[5] 6.25% [1],[2],[5]
New York | 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) 4.31% [1],[2],[5] 4.42% [1],[2],[5]
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 61.00% [1],[4] 61.00% [1],[4]
Seriously delinquent, percentage (loan count) 1.70% [1],[2],[5] 1.85% [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) 9.84% [1],[2],[5] 10.90% [1],[2],[5]
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 7.00% [1],[4] 7.00% [1],[4]
Seriously delinquent, percentage (loan count) 11.27% [1],[2],[5] 12.22% [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% [1],[4],[6] 0.50% [1],[4],[6]
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, 2014 and December 31, 2013.
[2] Consists of single-family conventional loans that were 90 days or more past due or in the foreclosure process as of March 31, 2014 and December 31, 2013.
[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] Represents less than 0.5% of the single-family conventional guaranty book of business.