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Mortgage Loans Individually Impaired Loans (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance $ 145,421 $ 162,230
Individually impaired loans with related allowance recorded: total recorded investment 136,977 152,765
Related allowance for loan losses 21,953 25,517
Individually impaired loans with no related allowance recorded: unpaid principal balance 20,732 21,245
Individually impaired loans with no related allowance recorded: total recorded investment 19,210 19,404
Total individually impaired loans: unpaid principal balance 166,153 183,475
Total individually impaired loans: total recorded investment 156,187 172,169
Single-Family [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 145,101 161,580
Individually impaired loans with related allowance recorded: total recorded investment 136,654 152,111
Related allowance for loan losses 21,920 25,437
Individually impaired loans with no related allowance recorded: unpaid principal balance 20,466 20,892
Individually impaired loans with no related allowance recorded: total recorded investment 18,944 19,050
Single-Family [Member] | Primary [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 105,113 116,477
Individually impaired loans with related allowance recorded: total recorded investment 99,825 110,502
Related allowance for loan losses 14,462 16,745
Individually impaired loans with no related allowance recorded: unpaid principal balance 15,733 15,891
Individually impaired loans with no related allowance recorded: total recorded investment 14,758 14,725
Single-Family [Member] | Government [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 302 322
Individually impaired loans with related allowance recorded: total recorded investment 305 327
Related allowance for loan losses 59 59
Individually impaired loans with no related allowance recorded: unpaid principal balance 63 58
Individually impaired loans with no related allowance recorded: total recorded investment 59 54
Single-Family [Member] | Alt-A [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 28,599 31,888
Individually impaired loans with related allowance recorded: total recorded investment 26,059 29,103
Related allowance for loan losses 5,365 6,217
Individually impaired loans with no related allowance recorded: unpaid principal balance 3,511 3,721
Individually impaired loans with no related allowance recorded: total recorded investment 3,062 3,169
Single-Family [Member] | Other [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 11,087 12,893
Individually impaired loans with related allowance recorded: total recorded investment 10,465 12,179
Related allowance for loan losses 2,034 2,416
Individually impaired loans with no related allowance recorded: unpaid principal balance 1,159 1,222
Individually impaired loans with no related allowance recorded: total recorded investment 1,065 1,102
Multifamily [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 320 650
Individually impaired loans with related allowance recorded: total recorded investment 323 654
Related allowance for loan losses 33 80
Individually impaired loans with no related allowance recorded: unpaid principal balance 266 353
Individually impaired loans with no related allowance recorded: total recorded investment $ 266 $ 354