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Concentrations of Credit Risk Other Concentrations (Details)
$ in Millions
Dec. 31, 2016
USD ($)
servicers
counterparties
insurers
Dec. 31, 2015
USD ($)
servicers
counterparties
insurers
Concentration Risk [Line Items]    
Estimated benefit included in total loss reserves $ 1,400 $ 2,300
Receivable from claims on insured, defaulted loans excluding government insured loans 1,000 1,200
Allowance for mortgage insurance receivable 638 770
Unpaid principal balance of guaranteed non-agency securities in our portfolio 1,400 3,200
Maximum potential exposure under guarantees not recognized in our consolidated balance sheets 4,700 5,600
Unconsolidated Fannie Mae MBS [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]    
Concentration Risk [Line Items]    
Maximum coverage provided by our right to collateral backing underlying loans, available credit enhancements and recourse with third parties $ 2,000 2,400
PMI [Member]    
Concentration Risk [Line Items]    
Mortgage insurance coverage risk in force percentage to be paid in cash 71.50%  
Mortgage insurance coverage risk in force percentage to be deferred 28.50%  
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%  
RMIC [Member]    
Concentration Risk [Line Items]    
Mortgage insurance coverage risk in force percentage to be paid in cash 100.00%  
Mortgage Sellers and Servicers [Member]    
Concentration Risk [Line Items]    
Receivable from claims on insured, defaulted loans excluding government insured loans $ 141 241
Ambac Assurance Corporation [Member]    
Concentration Risk [Line Items]    
Mortgage insurance coverage risk in force percentage to be paid in cash 45.00%  
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Concentration Risk [Line Items]    
Guaranteed securities issued by Freddie Mac, the federal government and its agencies $ 11,600 $ 16,700
Non-Government Guarantee [Member] | Insurance Service Provider Concentration Risk [Member] | Ambac Assurance Corporation [Member]    
Concentration Risk [Line Items]    
Percentage of concentration risk 50.00%  
Unpaid principal balance of guaranteed non-agency securities in our portfolio $ 707  
Single-Family [Member]    
Concentration Risk [Line Items]    
Number of mortgage servicers, including their affiliates, which serviced the majority of our guaranty book of business | servicers 5 5
Number of mortgage insurance companies who provided majority of mortgage insurance coverage risk in force | insurers 3 3
Number of mortgage insurers publicly disclosed credit quality deterioration | insurers 3  
Single-Family [Member] | Mortgage Credit Book of Business [Member] | Credit Concentration Risk [Member] | Alt-A [Member]    
Concentration Risk [Line Items]    
Unpaid principal balance of mortgage loans $ 87,400 $ 103,100
Single-Family [Member] | Unpaid Principal Balance [Member] | Credit Concentration Risk [Member] | Alt-A [Member]    
Concentration Risk [Line Items]    
Percentage of book of business 3.00% 4.00%
Single-Family [Member] | Guaranty Book of Business [Member]    
Concentration Risk [Line Items]    
Mortgage insurance coverage risk in force $ 126,200 $ 117,900
Mortgage insurance coverage risk in force as a percentage of book of business 4.00% 4.00%
Primary mortgage insurance coverage risk in force $ 125,600 $ 117,200
Pool mortgage insurance coverage risk in force $ 617 $ 736
Single-Family [Member] | Guaranty Book of Business [Member] | Conventional Mortgage [Member]    
Concentration Risk [Line Items]    
Percentage of book of business 100.00% 100.00%
Percentage of loans with detailed loan level information 99.00% 99.00%
Single-Family [Member] | Guaranty Book of Business [Member] | Conventional Mortgage [Member] | Minimum [Member]    
Concentration Risk [Line Items]    
Percentage of loans with detailed loan level information 99.00% 99.00%
Single-Family [Member] | Guaranty Book of Business [Member] | Credit Concentration Risk [Member] | Group of Largest Mortgage Servicers including Affiliates [Member]    
Concentration Risk [Line Items]    
Percentage of concentration risk 39.00% 44.00%
Single-Family [Member] | Guaranty Book of Business [Member] | Insurance Service Provider Concentration Risk [Member]    
Concentration Risk [Line Items]    
Percentage of concentration risk 6.00%  
Mortgage insurance coverage risk in force for insurers with credit quality deterioration $ 8,000  
Single-Family [Member] | Guaranty Book of Business [Member] | Insurance Service Provider Concentration Risk [Member] | Group of Top Mortgage Insurance Companies [Member]    
Concentration Risk [Line Items]    
Percentage of concentration risk 66.00% 68.00%
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 5
Maximum potential loss recovery from lenders under risk sharing agreements $ 54,800 $ 46,200
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 43.00% 40.00%
Multifamily [Member] | Guaranty Book of Business [Member]    
Concentration Risk [Line Items]    
Percentage of book of business 100.00% 100.00%
Percentage of loans with detailed loan level information 99.00% 99.00%
Multifamily [Member] | Guaranty Book of Business [Member] | Credit Concentration Risk [Member] | Group of Largest Mortgage Servicers including Affiliates [Member]    
Concentration Risk [Line Items]    
Percentage of concentration risk 47.00% 45.00%