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Mortgage Loans Individually Impaired Loans (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Financing Receivable, Impaired [Line Items]  
Individually impaired loans with related allowance recorded: unpaid principal balance $ 79,696
Individually impaired loans with related allowance recorded: total recorded investment 76,543
Related allowance for loan losses (8,220)
Individually impaired loans with no related allowance recorded: unpaid principal balance 22,424
Total individually impaired loans: total recorded investment 97,876
Individually impaired loans with no related allowance recorded: total recorded investment 21,333
Impaired Financing Receivable, Unpaid Principal Balance 102,120
Single-family [Member]  
Financing Receivable, Impaired [Line Items]  
Recorded investment 96,900
Individually impaired loans with related allowance recorded: unpaid principal balance 79,382
Individually impaired loans with related allowance recorded: total recorded investment 76,228
Related allowance for loan losses (8,175)
Individually impaired loans with no related allowance recorded: unpaid principal balance 22,061
Individually impaired loans with no related allowance recorded: total recorded investment 20,968
Single-family [Member] | FixedRateResidentialMortgage15yearMember  
Financing Receivable, Impaired [Line Items]  
Individually impaired loans with related allowance recorded: unpaid principal balance 954
Individually impaired loans with related allowance recorded: total recorded investment 960
Related allowance for loan losses (24)
Individually impaired loans with no related allowance recorded: unpaid principal balance 410
Individually impaired loans with no related allowance recorded: total recorded investment 407
Single-family [Member] | Fixed Rate Residential Mortgage 30 and 20 year Member  
Financing Receivable, Impaired [Line Items]  
Individually impaired loans with related allowance recorded: unpaid principal balance 63,091
Individually impaired loans with related allowance recorded: total recorded investment 61,033
Related allowance for loan losses (5,851)
Individually impaired loans with no related allowance recorded: unpaid principal balance 18,372
Individually impaired loans with no related allowance recorded: total recorded investment 17,578
Single-family [Member] | Other [Member]  
Financing Receivable, Impaired [Line Items]  
Individually impaired loans with related allowance recorded: unpaid principal balance 15,181
Individually impaired loans with related allowance recorded: total recorded investment 14,078
Related allowance for loan losses (2,291)
Individually impaired loans with no related allowance recorded: unpaid principal balance 3,014
Individually impaired loans with no related allowance recorded: total recorded investment 2,718
Single-family [Member] | Adjustable Rate Residential Mortgage  
Financing Receivable, Impaired [Line Items]  
Individually impaired loans with related allowance recorded: unpaid principal balance 156
Individually impaired loans with related allowance recorded: total recorded investment 157
Related allowance for loan losses (9)
Individually impaired loans with no related allowance recorded: unpaid principal balance 265
Individually impaired loans with no related allowance recorded: total recorded investment 265
Multifamily [Member]  
Financing Receivable, Impaired [Line Items]  
Recorded investment 102
Individually impaired loans with related allowance recorded: unpaid principal balance 314
Individually impaired loans with related allowance recorded: total recorded investment 315
Related allowance for loan losses (45)
Individually impaired loans with no related allowance recorded: unpaid principal balance 363
Individually impaired loans with no related allowance recorded: total recorded investment $ 365