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Concentrations of Credit Risk (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Single-Family [Member]
Dec. 31, 2011
Single-Family [Member]
Dec. 31, 2012
Single-Family [Member]
Guaranty Book of Business [Member]
insurers
servicers
Dec. 31, 2011
Single-Family [Member]
Guaranty Book of Business [Member]
servicers
insurers
Dec. 31, 2012
Multifamily [Member]
Dec. 31, 2011
Multifamily [Member]
Dec. 31, 2012
Multifamily [Member]
Guaranty Book of Business [Member]
servicers
Dec. 31, 2011
Multifamily [Member]
Guaranty Book of Business [Member]
servicers
Dec. 31, 2012
RMIC and Affiliate [Member]
Dec. 31, 2012
PMI [Member]
Dec. 31, 2012
Triad [Member]
Aug. 31, 2012
Ambac [Member]
Dec. 31, 2012
Lender Concentration Risk [Member]
Single-Family [Member]
counterparties
Apr. 02, 2013
Insurance Service Provider Concentration Risk [Member]
Single-Family [Member]
Guaranty Book of Business [Member]
insurers
Dec. 31, 2012
Insurance Service Provider Concentration Risk [Member]
Single-Family [Member]
Guaranty Book of Business [Member]
insurers
Dec. 31, 2012
Insurance Service Provider Concentration Risk [Member]
Ambac [Member]
Dec. 31, 2012
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Largest Mortgage Servicers, Including Their Affiliates [Member]
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2011
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Largest Mortgage Servicers, Including Their Affiliates [Member]
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2012
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Largest Mortgage Servicers, Including Their Affiliates [Member]
Multifamily [Member]
Guaranty Book of Business [Member]
Dec. 31, 2011
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Largest Mortgage Servicers, Including Their Affiliates [Member]
Multifamily [Member]
Guaranty Book of Business [Member]
Dec. 31, 2012
Mortgage Insurance Coverage [Member]
Insurance Service Provider Concentration Risk [Member]
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2012
Mortgage Insurance Coverage [Member]
Insurance Service Provider Concentration Risk [Member]
Mortgage Insurance Companies [Member]
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2011
Mortgage Insurance Coverage [Member]
Insurance Service Provider Concentration Risk [Member]
Mortgage Insurance Companies [Member]
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2012
Non-Government Guarantee [Member]
Insurance Service Provider Concentration Risk [Member]
Ambac [Member]
Dec. 31, 2012
Mortgage Sellers and Servicers [Member]
Dec. 31, 2011
Mortgage Sellers and Servicers [Member]
Dec. 31, 2012
Three Major Lenders [Member]
Lenders With Risk Sharing [Member]
Lender Concentration Risk [Member]
Single-Family [Member]
Dec. 31, 2011
Three Major Lenders [Member]
Lenders With Risk Sharing [Member]
Lender Concentration Risk [Member]
Single-Family [Member]
Dec. 31, 2012
Three Major Lenders [Member]
Lenders With Risk Sharing [Member]
Lender Concentration Risk [Member]
Multifamily [Member]
Dec. 31, 2011
Three Major Lenders [Member]
Lenders With Risk Sharing [Member]
Lender Concentration Risk [Member]
Multifamily [Member]
Dec. 31, 2012
West [Member]
Multifamily [Member]
Guaranty Book of Business [Member]
Dec. 31, 2011
West [Member]
Multifamily [Member]
Guaranty Book of Business [Member]
Dec. 31, 2012
California
Multifamily [Member]
Guaranty Book of Business [Member]
Dec. 31, 2011
California
Multifamily [Member]
Guaranty Book of Business [Member]
Dec. 31, 2012
New York
Multifamily [Member]
Guaranty Book of Business [Member]
Dec. 31, 2011
New York
Multifamily [Member]
Guaranty Book of Business [Member]
Dec. 31, 2012
Conventional Loan [Member]
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2011
Conventional Loan [Member]
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2012
Conventional Loan [Member]
West [Member]
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2011
Conventional Loan [Member]
West [Member]
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2012
Conventional Loan [Member]
California
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2011
Conventional Loan [Member]
California
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2012
Estimated Mark to Market LTV Ratio Greater Than 80% [Member]
Conventional Loan [Member]
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2011
Estimated Mark to Market LTV Ratio Greater Than 80% [Member]
Conventional Loan [Member]
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2012
Agency [Member]
Dec. 31, 2011
Agency [Member]
Dec. 31, 2012
Alt-A [Member]
Credit Concentration Risk [Member]
Single-Family [Member]
Credit Book of Business [Member]
Dec. 31, 2011
Alt-A [Member]
Credit Concentration Risk [Member]
Single-Family [Member]
Credit Book of Business [Member]
Dec. 31, 2012
Alt-A [Member]
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Single-Family [Member]
Credit Book of Business [Member]
Dec. 31, 2011
Alt-A [Member]
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Single-Family [Member]
Credit Book of Business [Member]
Dec. 31, 2012
Subprime [Member]
Maximum [Member]
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Single-Family [Member]
Credit Book of Business [Member]
Dec. 31, 2011
Subprime [Member]
Maximum [Member]
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Single-Family [Member]
Credit Book of Business [Member]
Dec. 31, 2012
Alt-A private-label securities [Member]
Maximum [Member]
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Single-Family [Member]
Credit Book of Business [Member]
Dec. 31, 2011
Alt-A private-label securities [Member]
Maximum [Member]
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Single-Family [Member]
Credit Book of Business [Member]
Dec. 31, 2012
Subprime private-label securities [Member]
Maximum [Member]
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Single-Family [Member]
Credit Book of Business [Member]
Dec. 31, 2011
Subprime private-label securities [Member]
Maximum [Member]
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Single-Family [Member]
Credit Book of Business [Member]
Concentration Risk [Line Items]                                                                                                                    
Percentage of book of business                 100.00% [1],[2] 100.00% [1],[2]                                             32.00% [1],[2] 34.00% [1],[2] 25.00% 26.00% 13.00% 13.00% 100.00% [1],[3] 100.00% [1],[3] 27.00% [1],[3] 27.00% [1],[3] 19.00% [4],[5] 19.00% [4],[5] 36.00% 44.00%                        
Number of mortgage servicers, including their affiliates, which serviced the majority of our guaranty book of business         5 5     10 10                                                                                                
Unpaid principal balance of mortgage loans                                                                                                 $ 157,000,000,000 $ 183,800,000,000                
Percentage of concentration risk                                     57.00% 63.00% 67.00% 67.00% 77.00% 93.00% 94.00% 44.00%     55.00% 58.00% 35.00% 40.00%                                     5.00% 6.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Number of mortgage insurers publicly disclosed that are in run-off                               3                                                                                    
Mortgage insurance coverage risk in force         91,700,000,000 91,200,000,000                                                                                                        
Mortgage insurance coverage risk in force as percentage         3.00% 3.00%                                                                                                        
Primary mortgage insurance coverage risk in force         90,500,000,000 87,300,000,000                                                                                                        
Pool mortgage insurance coverage risk in force         1,200,000,000 3,900,000,000                                                                                                        
Number of mortgage insurance companies provided majority of our mortgage insurance         6 6                                                                                                        
Number of mortgage insurers with credit quality deterioration                                 6                                                                                  
Mortgage insurance coverage risk in force, insurers with credit quality deterioration                                 70,300,000,000                                                                                  
Percentage of mortgage guaranty insurance policy claims to be paid by insurer                     60.00% 50.00% 60.00% 25.00%                                                                                        
Prior percentage of mortgage guaranty insurance policy claims to be paid by insurer                     50.00%                                                                                              
Percentage of mortgage guaranty insurance policy claims to be deferred by insurer                     40.00% 50.00% 40.00%                                                                                          
Receivable from claims on insured defaulted loans 3,700,000,000 3,600,000,000                                                 1,100,000,000 639,000,000                                                            
Allowance for mortgage insurance receivable 551,000,000 570,000,000                                                                                                                
Proceeds received from primary and pool mortgage insurance policies     5,100,000,000 5,800,000,000                                                                                                            
Unpaid principal balance of guaranteed non-agency securities in our portfolio 6,858,000,000 7,971,000,000                               3,000,000,000                                                                                
Guaranteed securities issued by Freddie Mac, the federal government and its agencies                                                                                             27,300,000,000 31,400,000,000                    
Maximum potential loss recovery from lenders under these risk sharing agreements     11,900,000,000 12,800,000,000     36,400,000,000 32,100,000,000                                                                                                    
Number of major lenders in our risk sharing agreements                             3                                                                                      
Maximum potential exposure under guarantees not recognized in our consolidated balance sheets 8,300,000,000 9,300,000,000                                                                                                                
Maximum amount recoverable for off-balance sheet guarantees through available credit enhancements and recourse with third parties $ 3,600,000,000 $ 4,000,000,000                                                                                                                
[1] Midwest includes IL, IN, IA, MI, MN, NE, ND, OH, SD, WI; Northeast includes CT, DE, ME, MA, NH, NJ, NY, PA, PR, RI, VT, VI; Southeast includes AL, DC, FL, GA, KY, MD, MS, NC, SC, TN, VA, WV; Southwest includes AZ, AR, CO, KS, LA, MO, NM, OK, TX, UT; West includes AK, CA, GU, HI, ID, MT, NV, OR, WA and WY.
[2] Consists of the portion of our multifamily guaranty book of business for which we have detailed loan level information, which constituted 99% of our total multifamily guaranty book of business as of December 31, 2012 and 2011.
[3] Consists of the portion of our single-family conventional guaranty book of business for which we have detailed loan level information, which constituted over 99% of our total single-family conventional guaranty book of business as of December 31, 2012 and 2011.
[4] 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 December 31, 2012 and 2011.
[5] 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.