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Concentrations of Credit Risk (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Single-Family [Member]
Dec. 31, 2012
Single-Family [Member]
Dec. 31, 2013
Single-Family [Member]
Guaranty Book of Business [Member]
servicers
insurers
Dec. 31, 2012
Single-Family [Member]
Guaranty Book of Business [Member]
insurers
servicers
Dec. 31, 2013
Multifamily [Member]
Dec. 31, 2012
Multifamily [Member]
Dec. 31, 2013
Multifamily [Member]
Guaranty Book of Business [Member]
servicers
Dec. 31, 2012
Multifamily [Member]
Guaranty Book of Business [Member]
servicers
Dec. 31, 2013
RMIC and Affiliate [Member]
Dec. 31, 2013
PMI [Member]
Dec. 31, 2013
Triad [Member]
Dec. 01, 2013
Triad [Member]
Sep. 30, 2013
Triad [Member]
Dec. 31, 2013
Ambac [Member]
Dec. 31, 2013
Lender Concentration Risk [Member]
Single-Family [Member]
counterparties
Dec. 31, 2012
Lender Concentration Risk [Member]
Single-Family [Member]
counterparties
Dec. 31, 2013
Lender Concentration Risk [Member]
Multifamily [Member]
counterparties
Dec. 31, 2012
Lender Concentration Risk [Member]
Multifamily [Member]
counterparties
Dec. 31, 2013
Insurance Service Provider Concentration Risk [Member]
Single-Family [Member]
Guaranty Book of Business [Member]
insurers
Dec. 31, 2013
Insurance Service Provider Concentration Risk [Member]
Ambac [Member]
Dec. 31, 2013
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]
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2013
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
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Largest Mortgage Servicers, Including Their Affiliates [Member]
Multifamily [Member]
Guaranty Book of Business [Member]
Dec. 31, 2013
Mortgage Insurance Coverage [Member]
Insurance Service Provider Concentration Risk [Member]
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2013
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
Mortgage Insurance Coverage [Member]
Insurance Service Provider Concentration Risk [Member]
Mortgage Insurance Companies [Member]
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2013
Non-Government Guarantee [Member]
Insurance Service Provider Concentration Risk [Member]
Ambac [Member]
Dec. 31, 2013
Mortgage Sellers and Servicers [Member]
Dec. 31, 2012
Mortgage Sellers and Servicers [Member]
Dec. 31, 2013
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]
Single-Family [Member]
Dec. 31, 2013
Three Major Lenders [Member]
Lenders With Risk Sharing [Member]
Lender Concentration Risk [Member]
Multifamily [Member]
Dec. 31, 2012
Three Major Lenders [Member]
Lenders With Risk Sharing [Member]
Lender Concentration Risk [Member]
Multifamily [Member]
Dec. 31, 2013
West [Member]
Multifamily [Member]
Guaranty Book of Business [Member]
Dec. 31, 2012
West [Member]
Multifamily [Member]
Guaranty Book of Business [Member]
Dec. 31, 2013
California
Multifamily [Member]
Guaranty Book of Business [Member]
Dec. 31, 2012
California
Multifamily [Member]
Guaranty Book of Business [Member]
Dec. 31, 2013
New York
Multifamily [Member]
Guaranty Book of Business [Member]
Dec. 31, 2012
New York
Multifamily [Member]
Guaranty Book of Business [Member]
Dec. 31, 2013
Conventional Loan [Member]
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2012
Conventional Loan [Member]
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2013
Conventional Loan [Member]
West [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, 2013
Conventional Loan [Member]
California
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, 2013
Conventional Loan [Member]
New York
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2012
Conventional Loan [Member]
New York
Single-Family [Member]
Guaranty Book of Business [Member]
Dec. 31, 2013
Agency [Member]
Dec. 31, 2012
Agency [Member]
Dec. 31, 2013
Alt-A [Member]
Credit Concentration Risk [Member]
Single-Family [Member]
Credit Book of Business [Member]
Dec. 31, 2012
Alt-A [Member]
Credit Concentration Risk [Member]
Single-Family [Member]
Credit Book of Business [Member]
Dec. 31, 2013
Alt-A [Member]
Unpaid Principal Balance [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, 2013
Subprime [Member]
Maximum [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, 2013
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
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, 2013
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, 2012
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]                                                     31.00% [1],[2] 32.00% [1],[2] 24.00% 25.00% 12.00% 13.00% 100.00% [2],[3] 100.00% [2],[3] 28.00% [2],[3] 27.00% [2],[3] 20.00% [4],[5] 19.00% [4],[5] 5.00% [4],[5] 6.00% [4],[5]                        
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                                                                                                         $ 132,500,000,000 $ 157,000,000,000                
Percentage of concentration risk                                             49.00% 57.00% 65.00% 67.00% 14.00% 91.00% 93.00% 46.00%     52.00% 55.00% 32.00% 35.00%                                     5.00% 5.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Mortgage insurance coverage risk in force         102,500,000,000 91,700,000,000                                                                                                                
Mortgage insurance coverage risk in force as percentage         4.00% 3.00%                                                                                                                
Primary mortgage insurance coverage risk in force         101,400,000,000 90,500,000,000                                                                                                                
Pool mortgage insurance coverage risk in force         1,100,000,000 1,200,000,000                                                                                                                
Number of mortgage insurance companies provided majority of our mortgage insurance         6 6                                                                                                                
Number of mortgage insurers with credit quality deterioration                                         3                                                                                  
Mortgage insurance coverage risk in force, insurers with credit quality deterioration                                         14,800,000,000                                                                                  
Percentage of mortgage guaranty insurance policy claims to be paid by insurer                     60.00% 55.00% 75.00% 75.00% 60.00% 25.00%                                                                                            
Percentage of mortgage guaranty insurance policy claims to be deferred by insurer                     40.00% 45.00%                                                                                                    
Receivable from claims on insured defaulted loans 2,100,000,000 3,700,000,000                                                         402,000,000 1,100,000,000                                                            
Allowance for mortgage insurance receivable 655,000,000 551,000,000                                                                                                                        
Proceeds received from primary and pool mortgage insurance policies     5,700,000,000 5,100,000,000                                                                                                                    
Unpaid principal balance of guaranteed non-agency securities in our portfolio 5,554,000,000 6,858,000,000                                       2,500,000,000                                                                                
Guaranteed securities issued by Freddie Mac, the federal government and its agencies                                                                                                     22,500,000,000 27,300,000,000                    
Maximum potential loss recovery from lenders under these risk sharing agreements     10,700,000,000 11,900,000,000     39,400,000,000 36,400,000,000                                                                                                            
Number of major lenders in our risk sharing agreements                                 3 3 3 3                                                                                    
Maximum potential exposure under guarantees not recognized in our consolidated balance sheets 7,300,000,000 8,300,000,000                                                                                                                        
Maximum amount recoverable for off-balance sheet guarantees through available credit enhancements and recourse with third parties $ 3,100,000,000 $ 3,600,000,000                                                                                                                        
[1] 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, 2013 and 2012.
[2] Midwest consists of IL, IN, IA, MI, MN, NE, ND, OH, SD, WI; Northeast consists of CT, DE, ME, MA, NH, NJ, NY, PA, PR, RI, VT, VI; Southeast consists of AL, DC, FL, GA, KY, MD, MS, NC, SC, TN, VA, WV; Southwest consists of AZ, AR, CO, KS, LA, MO, NM, OK, TX, UT; West consists of AK, CA, GU, HI, ID, MT, NV, OR, WA and WY.
[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, 2013 and 2012.
[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] 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, 2013 and 2012.