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Concentrations of Credit Risk Concentration of Credit Risk (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2014
insurers
Dec. 31, 2013
Mar. 07, 2014
PMI Mortgage Insurance Co. [Member]
Dec. 31, 2013
PMI Mortgage Insurance Co. [Member]
Mar. 31, 2014
Single-Family [Member]
Mar. 31, 2013
Single-Family [Member]
Mar. 31, 2014
Mortgage Sellers and Servicers [Member]
Dec. 31, 2013
Mortgage Sellers and Servicers [Member]
Mar. 31, 2014
Guaranty Book of Business [Member]
Single-Family [Member]
insurers
servicers
Dec. 31, 2013
Guaranty Book of Business [Member]
Single-Family [Member]
insurers
servicers
Mar. 31, 2014
Guaranty Book of Business [Member]
Single-Family [Member]
Insurance Service Provider Concentration Risk [Member]
Mar. 31, 2014
Guaranty Book of Business [Member]
Single-Family [Member]
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Largest Mortgage Servicers, Including Their Affiliates [Member]
Dec. 31, 2013
Guaranty Book of Business [Member]
Single-Family [Member]
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Largest Mortgage Servicers, Including Their Affiliates [Member]
Mar. 31, 2014
Guaranty Book of Business [Member]
Single-Family [Member]
Mortgage Insurance Coverage [Member]
Insurance Service Provider Concentration Risk [Member]
Mar. 31, 2014
Guaranty Book of Business [Member]
Single-Family [Member]
Mortgage Insurance Coverage [Member]
Insurance Service Provider Concentration Risk [Member]
Mortgage Insurance Companies [Member]
Dec. 31, 2013
Guaranty Book of Business [Member]
Single-Family [Member]
Mortgage Insurance Coverage [Member]
Insurance Service Provider Concentration Risk [Member]
Mortgage Insurance Companies [Member]
Mar. 31, 2014
Guaranty Book of Business [Member]
Multifamily [Member]
servicers
Dec. 31, 2013
Guaranty Book of Business [Member]
Multifamily [Member]
servicers
Mar. 31, 2014
Guaranty Book of Business [Member]
Multifamily [Member]
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Largest Mortgage Servicers, Including Their Affiliates [Member]
Dec. 31, 2013
Guaranty Book of Business [Member]
Multifamily [Member]
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Largest Mortgage Servicers, Including Their Affiliates [Member]
Concentration of Credit Risk [Line Items]                                        
Number of mortgage servicers, including their affiliates, which serviced the majority of our guaranty book of business                 5 5             10 10    
Percentage of concentration risk                       48.00% 49.00% 14.00% 79.00% 78.00%     66.00% 65.00%
Mortgage Insurance Coverage Risk In Force                 $ 103,300,000,000 $ 102,500,000,000                    
Mortgage insurance coverage risk in force as percentage                 4.00% 4.00%                    
Primary Mortgage Insurance Coverage Risk in Force                 102,200,000,000 101,400,000,000                    
Pool Mortgage Insurance Coverage Risk in Force                 1,000,000,000 1,100,000,000                    
Number of mortgage insurance companies provided majority of our mortgage insurance                 4 4                    
Number of Mortgage Insurers publicly disclosed credit quality deterioration 3                                      
Mortgage insurance coverage risk in force, insurers with credit quality deterioration                     14,200,000,000                  
Mortgage Insurance Coverage Risk in Force, Insurance Claim, Percentage To be Paid in Cash by Mortgage Insurer     67.00% 55.00%                                
Receivable from claims on insured defaulted loans 2,000,000,000 2,100,000,000         310,000,000 402,000,000                        
Allowance for mortgage insurance receivable 621,000,000 655,000,000                                    
Proceeds received from primary and pool mortgage insurance policies         $ 1,400,000,000 $ 2,100,000,000