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Mortgage Loans Individually Impaired Loans (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance $ 139,856 $ 145,421
Individually impaired loans with related allowance recorded: total recorded investment 131,704 136,977
Related allowance for loan losses 20,768 21,953
Individually impaired loans with no related allowance recorded: unpaid principal balance 20,904 20,732
Individually impaired loans with no related allowance recorded: total recorded investment 19,501 19,210
Total individually impaired loans: unpaid principal balance 160,760 166,153
Total individually impaired loans: total recorded investment 151,205 156,187
Single-family [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 139,558 145,101
Individually impaired loans with related allowance recorded: total recorded investment 131,404 136,654
Related allowance for loan losses 20,731 21,920
Individually impaired loans with no related allowance recorded: unpaid principal balance 20,606 20,466
Individually impaired loans with no related allowance recorded: total recorded investment 19,202 18,944
Single-family [Member] | Primary [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 101,570 105,113
Individually impaired loans with related allowance recorded: total recorded investment 96,469 99,825
Related allowance for loan losses 13,746 14,462
Individually impaired loans with no related allowance recorded: unpaid principal balance 15,917 15,733
Individually impaired loans with no related allowance recorded: total recorded investment 15,023 14,758
Single-family [Member] | Government [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 296 302
Individually impaired loans with related allowance recorded: total recorded investment 299 305
Related allowance for loan losses 58 59
Individually impaired loans with no related allowance recorded: unpaid principal balance 65 63
Individually impaired loans with no related allowance recorded: total recorded investment 60 59
Single-family [Member] | Alt-A [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 27,380 28,599
Individually impaired loans with related allowance recorded: total recorded investment 24,912 26,059
Related allowance for loan losses 5,053 5,365
Individually impaired loans with no related allowance recorded: unpaid principal balance 3,494 3,511
Individually impaired loans with no related allowance recorded: total recorded investment 3,075 3,062
Single-family [Member] | Other [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 10,312 11,087
Individually impaired loans with related allowance recorded: total recorded investment 9,724 10,465
Related allowance for loan losses 1,874 2,034
Individually impaired loans with no related allowance recorded: unpaid principal balance 1,130 1,159
Individually impaired loans with no related allowance recorded: total recorded investment 1,044 1,065
Multifamily [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 298 320
Individually impaired loans with related allowance recorded: total recorded investment 300 323
Related allowance for loan losses 37 33
Individually impaired loans with no related allowance recorded: unpaid principal balance 298 266
Individually impaired loans with no related allowance recorded: total recorded investment $ 299 $ 266