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Concentrations of Credit Risk Concentration of Credit Risk (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Aug. 08, 2012
insurers
Jun. 30, 2012
insurers
Dec. 31, 2011
Jun. 30, 2012
Single-Family [Member]
Jun. 30, 2011
Single-Family [Member]
Jun. 30, 2012
Single-Family [Member]
Jun. 30, 2011
Single-Family [Member]
Jun. 30, 2012
Mortgage Sellers and Servicers [Member]
Dec. 31, 2011
Mortgage Sellers and Servicers [Member]
Jun. 30, 2012
Guaranty Book of Business [Member]
Single-Family [Member]
servicers
insurers
Dec. 31, 2011
Guaranty Book of Business [Member]
Single-Family [Member]
servicers
insurers
Jun. 30, 2012
Guaranty Book of Business [Member]
Single-Family [Member]
Insurance Service Provider Concentration Risk [Member]
Jun. 30, 2012
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, 2011
Guaranty Book of Business [Member]
Single-Family [Member]
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Largest Mortgage Servicers, Including Their Affiliates [Member]
Jun. 30, 2012
Guaranty Book of Business [Member]
Single-Family [Member]
Mortgage Insurance Coverage [Member]
Insurance Service Provider Concentration Risk [Member]
Jun. 30, 2012
Guaranty Book of Business [Member]
Single-Family [Member]
Mortgage Insurance Coverage [Member]
Insurance Service Provider Concentration Risk [Member]
Mortgage Insurance Companies [Member]
Dec. 31, 2011
Guaranty Book of Business [Member]
Single-Family [Member]
Mortgage Insurance Coverage [Member]
Insurance Service Provider Concentration Risk [Member]
Mortgage Insurance Companies [Member]
Jun. 30, 2012
Guaranty Book of Business [Member]
Multifamily [Member]
servicers
Dec. 31, 2011
Guaranty Book of Business [Member]
Multifamily [Member]
servicers
Jun. 30, 2012
Guaranty Book of Business [Member]
Multifamily [Member]
Unpaid Principal Balance [Member]
Credit Concentration Risk [Member]
Largest Mortgage Servicers, Including Their Affiliates [Member]
Dec. 31, 2011
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                         61.00% 63.00% 79.00% 93.00% 94.00%     65.00% 67.00%
Mortgage insurance coverage risk in force                   $ 90,700,000,000 $ 91,200,000,000                    
Mortgage insurance coverage risk in force as percentage                   3.00%                      
Primary mortgage insurance coverage risk in force                   86,900,000,000 87,300,000,000                    
Pool mortgage insurance coverage risk in force                   3,700,000,000 3,900,000,000                    
Number of mortgage insurance companies provided majority of our mortgage insurance                   6 6                    
Number of mortgage insurers in receivership 1                                        
Number of Mortgage Insurers Publicly Disclosed That Are in Run-off 2                                        
Number of mortgage insurers operating pursuant to a waiver from its regulator 1                                        
Number of mortgage insurers with possible future noncompliance with state regulatory capital requirements 1                                        
Number of mortgage insurers with credit quality deterioration   6                                      
Mortgage insurance coverage risk in force, insurers with credit quality deterioration                       72,000,000,000                  
Receivable from claims on insured defaulted loans   3,800,000,000 3,600,000,000         1,100,000,000 639,000,000                        
Allowance for mortgage insurance receivable   848,000,000 570,000,000                                    
Average duration of mortgage insurance receivable   6 months 6 months                                    
Proceeds received from primary and pool mortgage insurance policies       $ 1,200,000,000 $ 1,500,000,000 $ 2,500,000,000 $ 3,100,000,000