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Mortgage Loans Individually Impaired Loans (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance $ 149,125 $ 162,230
Individually impaired loans with related allowance recorded: total recorded investment 140,677 152,765
Related allowance for loan losses 21,326 25,517
Individually impaired loans with no related allowance recorded: unpaid principal balance 22,327 21,245
Individually impaired loans with no related allowance recorded: total recorded investment 20,396 19,404
Total individually impaired loans: unpaid principal balance 171,452 183,475
Total individually impaired loans: total recorded investment 161,073 172,169
Single-family [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 148,678 161,580
Individually impaired loans with related allowance recorded: total recorded investment 140,227 152,111
Related allowance for loan losses 21,285 25,437
Individually impaired loans with no related allowance recorded: unpaid principal balance 22,012 20,892
Individually impaired loans with no related allowance recorded: total recorded investment 20,080 19,050
Single-family [Member] | Primary [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 107,455 116,477
Individually impaired loans with related allowance recorded: total recorded investment 102,148 110,502
Related allowance for loan losses 14,034 16,745
Individually impaired loans with no related allowance recorded: unpaid principal balance 16,798 15,891
Individually impaired loans with no related allowance recorded: total recorded investment 15,574 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 306 327
Related allowance for loan losses 58 59
Individually impaired loans with no related allowance recorded: unpaid principal balance 66 58
Individually impaired loans with no related allowance recorded: total recorded investment 62 54
Single-family [Member] | Alt-A [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 29,294 31,888
Individually impaired loans with related allowance recorded: total recorded investment 26,763 29,103
Related allowance for loan losses 5,204 6,217
Individually impaired loans with no related allowance recorded: unpaid principal balance 3,892 3,721
Individually impaired loans with no related allowance recorded: total recorded investment 3,325 3,169
Single-family [Member] | Other [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 11,627 12,893
Individually impaired loans with related allowance recorded: total recorded investment 11,010 12,179
Related allowance for loan losses 1,989 2,416
Individually impaired loans with no related allowance recorded: unpaid principal balance 1,256 1,222
Individually impaired loans with no related allowance recorded: total recorded investment 1,119 1,102
Multifamily [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 447 650
Individually impaired loans with related allowance recorded: total recorded investment 450 654
Related allowance for loan losses 41 80
Individually impaired loans with no related allowance recorded: unpaid principal balance 315 353
Individually impaired loans with no related allowance recorded: total recorded investment $ 316 $ 354