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Concentrations of Credit Risk Other Concentrations (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
insurers
Dec. 31, 2017
USD ($)
counterparties
Dec. 31, 2016
USD ($)
servicers
counterparties
insurers
Concentration Risk [Line Items]      
Estimated benefit included in combined loss reserves $ 691 $ 989  
Receivable from claims on insured, defaulted loans excluding government insured loans 745 858  
Allowance for mortgage insurance receivable 564 593  
Unpaid principal balance of guaranteed non-agency securities in our portfolio $ 538 849  
PMI [Member]      
Concentration Risk [Line Items]      
Mortgage insurance coverage risk in force percentage to be paid in cash 72.50%    
Mortgage insurance coverage risk in force percentage to be deferred 27.50%    
Triad [Member]      
Concentration Risk [Line Items]      
Mortgage insurance coverage risk in force percentage to be paid in cash 75.00%    
Mortgage insurance coverage risk in force percentage to be deferred 25.00%    
Other agency [Member]      
Concentration Risk [Line Items]      
Guaranteed securities issued by Freddie Mac, the federal government and its agencies   10,700 $ 9,500
Single-Family [Member]      
Concentration Risk [Line Items]      
Number of mortgage insurance companies who provided majority of mortgage insurance coverage risk in force | insurers     3
Number of mortgage insurers publicly disclosed credit quality deterioration | insurers 3    
Single-Family [Member] | Guaranty Book of Business [Member]      
Concentration Risk [Line Items]      
Mortgage insurance coverage risk in force $ 152,788 $ 138,460  
Mortgage insurance coverage risk in force as a percentage of book of business 5.00% 5.00% 4.00%
Primary mortgage insurance coverage risk in force $ 152,379 $ 137,941  
Pool mortgage insurance coverage risk in force $ 409 $ 519  
Single-Family [Member] | Guaranty Book of Business [Member] | Conventional Mortgage [Member]      
Concentration Risk [Line Items]      
Percentage of book of business 100.00% 100.00%  
Single-Family [Member] | Guaranty Book of Business [Member] | Credit Concentration Risk [Member] | Group of Largest Mortgage Servicers including Affiliates [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 56.00% 55.00%  
Single-Family [Member] | Guaranty Book of Business [Member] | Insurance Service Provider Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 100.00% 100.00%  
Mortgage insurance coverage risk in force for insurers with credit quality deterioration $ 4,600    
Percentage of concentration risk 3.00%    
Single-Family [Member] | Guaranty Book of Business [Member] | Insurance Service Provider Concentration Risk [Member] | Arch Capital Group Ltd. [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 25.00% 25.00%  
Single-Family [Member] | Guaranty Book of Business [Member] | Insurance Service Provider Concentration Risk [Member] | Radian Guaranty, Inc [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 21.00% 21.00%  
Single-Family [Member] | Guaranty Book of Business [Member] | Insurance Service Provider Concentration Risk [Member] | Mortgage Guaranty Insurance Corp. [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 18.00% 19.00%  
Single-Family [Member] | Guaranty Book of Business [Member] | Insurance Service Provider Concentration Risk [Member] | Genworth Mortgage Insurance Corp. [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 15.00% 15.00%  
Single-Family [Member] | Guaranty Book of Business [Member] | Insurance Service Provider Concentration Risk [Member] | Essent Guaranty, Inc [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 12.00% 11.00%  
Single-Family [Member] | Guaranty Book of Business [Member] | Insurance Service Provider Concentration Risk [Member] | Other counterparties [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 9.00% 9.00%  
Single-Family [Member] | Depository Servicer [Member]      
Concentration Risk [Line Items]      
Number of mortgage servicers, including their affiliates, which serviced the majority of our guaranty book of business | servicers     5
Single-Family [Member] | Depository Servicer [Member] | Guaranty Book of Business [Member] | Credit Concentration Risk [Member] | Wells Fargo Bank N.A. [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 18.00% 18.00%  
Single-Family [Member] | Depository Servicer [Member] | Guaranty Book of Business [Member] | Credit Concentration Risk [Member] | Other Top Servicers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 16.00% 17.00%  
Single-Family [Member] | Non-Depository Servicer [Member]      
Concentration Risk [Line Items]      
Number of mortgage servicers, including their affiliates, which serviced the majority of our guaranty book of business | servicers     5
Single-Family [Member] | Non-Depository Servicer [Member] | Guaranty Book of Business [Member] | Credit Concentration Risk [Member] | Group of Largest Mortgage Servicers including Affiliates [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 22.00% 20.00%  
Multifamily [Member]      
Concentration Risk [Line Items]      
Number of mortgage servicers, including their affiliates, which serviced the majority of our guaranty book of business | servicers     5
Maximum potential loss recovery from lenders under risk sharing agreements   $ 71,800 $ 63,400
Multifamily [Member] | Lender Concentration Risk [Member]      
Concentration Risk [Line Items]      
Number of DUS lenders | counterparties   4 4
Multifamily [Member] | Lender Concentration Risk [Member] | Four Major Lenders [Member]      
Concentration Risk [Line Items]      
Percentage of concentration risk 44.00% 43.00% 43.00%
Multifamily [Member] | Guaranty Book of Business [Member]      
Concentration Risk [Line Items]      
Percentage of book of business 100.00% 100.00%  
Multifamily [Member] | Guaranty Book of Business [Member] | Credit Concentration Risk [Member] | Wells Fargo Bank N.A. [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 14.00% 14.00%  
Multifamily [Member] | Guaranty Book of Business [Member] | Credit Concentration Risk [Member] | Group of Largest Mortgage Servicers including Affiliates [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 48.00% 48.00%  
Multifamily [Member] | Guaranty Book of Business [Member] | Credit Concentration Risk [Member] | Other Top Servicers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 22.00% 22.00%  
Multifamily [Member] | Guaranty Book of Business [Member] | Credit Concentration Risk [Member] | Walker & Dunlop, LLC [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 12.00% 12.00%