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Mortgage Loans Individually Impaired Loans (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance $ 158,226 $ 162,230
Individually impaired loans with related allowance recorded: total recorded investment 149,087 152,765
Related allowance for loan losses 23,794 25,517
Individually impaired loans with no related allowance recorded: unpaid principal balance 22,008 21,245
Individually impaired loans with no related allowance recorded: total recorded investment 20,119 19,404
Total individually impaired loans: unpaid principal balance 180,234 183,475
Total individually impaired loans: total recorded investment 169,206 172,169
Single-family [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 157,651 161,580
Individually impaired loans with related allowance recorded: total recorded investment 148,510 152,111
Related allowance for loan losses 23,723 25,437
Individually impaired loans with no related allowance recorded: unpaid principal balance 21,664 20,892
Individually impaired loans with no related allowance recorded: total recorded investment 19,774 19,050
Single-family [Member] | Primary [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 113,863 116,477
Individually impaired loans with related allowance recorded: total recorded investment 108,108 110,502
Related allowance for loan losses 15,657 16,745
Individually impaired loans with no related allowance recorded: unpaid principal balance 16,410 15,891
Individually impaired loans with no related allowance recorded: total recorded investment 15,214 14,725
Single-family [Member] | Government [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 316 322
Individually impaired loans with related allowance recorded: total recorded investment 320 327
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 30,969 31,888
Individually impaired loans with related allowance recorded: total recorded investment 28,261 29,103
Related allowance for loan losses 5,768 6,217
Individually impaired loans with no related allowance recorded: unpaid principal balance 3,939 3,721
Individually impaired loans with no related allowance recorded: total recorded investment 3,376 3,169
Single-family [Member] | Other [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 12,503 12,893
Individually impaired loans with related allowance recorded: total recorded investment 11,821 12,179
Related allowance for loan losses 2,239 2,416
Individually impaired loans with no related allowance recorded: unpaid principal balance 1,252 1,222
Individually impaired loans with no related allowance recorded: total recorded investment 1,125 1,102
Multifamily [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 575 650
Individually impaired loans with related allowance recorded: total recorded investment 577 654
Related allowance for loan losses 71 80
Individually impaired loans with no related allowance recorded: unpaid principal balance 344 353
Individually impaired loans with no related allowance recorded: total recorded investment $ 345 $ 354