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Mortgage Loans Individually Impaired Loans (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance $ 123,314 $ 145,421
Individually impaired loans with related allowance recorded: total recorded investment 116,474 136,977
Related allowance for loan losses (17,289) (21,953)
Individually impaired loans with no related allowance recorded: unpaid principal balance 20,642 20,732
Individually impaired loans with no related allowance recorded: total recorded investment 19,307 19,210
Total individually impaired loans: unpaid principal balance 143,956 166,153
Total individually impaired loans: total recorded investment 135,781 156,187
Single-Family [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 123,035 145,101
Individually impaired loans with related allowance recorded: total recorded investment 116,194 136,654
Related allowance for loan losses (17,247) (21,920)
Individually impaired loans with no related allowance recorded: unpaid principal balance 20,334 20,466
Individually impaired loans with no related allowance recorded: total recorded investment 18,997 18,944
Single-Family [Member] | Primary [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 91,194 105,113
Individually impaired loans with related allowance recorded: total recorded investment 86,864 99,825
Related allowance for loan losses (11,652) (14,462)
Individually impaired loans with no related allowance recorded: unpaid principal balance 16,027 15,733
Individually impaired loans with no related allowance recorded: total recorded investment 15,158 14,758
Single-Family [Member] | Government [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 276 302
Individually impaired loans with related allowance recorded: total recorded investment 279 305
Related allowance for loan losses (56) (59)
Individually impaired loans with no related allowance recorded: unpaid principal balance 66 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 23,077 28,599
Individually impaired loans with related allowance recorded: total recorded investment 21,045 26,059
Related allowance for loan losses (4,046) (5,365)
Individually impaired loans with no related allowance recorded: unpaid principal balance 3,253 3,511
Individually impaired loans with no related allowance recorded: total recorded investment 2,870 3,062
Single-Family [Member] | Other [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 8,488 11,087
Individually impaired loans with related allowance recorded: total recorded investment 8,006 10,465
Related allowance for loan losses (1,493) (2,034)
Individually impaired loans with no related allowance recorded: unpaid principal balance 988 1,159
Individually impaired loans with no related allowance recorded: total recorded investment 909 1,065
Multifamily [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 279 320
Individually impaired loans with related allowance recorded: total recorded investment 280 323
Related allowance for loan losses (42) (33)
Individually impaired loans with no related allowance recorded: unpaid principal balance 308 266
Individually impaired loans with no related allowance recorded: total recorded investment $ 310 $ 266