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Mortgage Loans Individually Impaired Loans (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance $ 162,230 $ 177,630
Individually impaired loans with related allowance recorded: total recorded investment 152,765 168,510
Related Allowance for loan losses 25,517 31,375
Individually impaired loans with no related allowance recorded: unpaid principal balance 21,245 22,563
Individually impaired loans with no related allowance recorded: total recorded investment 19,404 19,676
Total individually impaired loans: unpaid principal balance 183,475 200,193
Total individually impaired loans: total recorded investment 172,169 188,186
Interest Receivable [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance for loan losses   501
Single-Family [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 161,580 176,400
Individually impaired loans with related allowance recorded: total recorded investment 152,111 167,269
Related Allowance for loan losses 25,437 31,200
Individually impaired loans with no related allowance recorded: unpaid principal balance 20,892 21,998
Individually impaired loans with no related allowance recorded: total recorded investment 19,050 19,108
Single-Family [Member] | Interest Receivable [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance for loan losses   495
Single-Family [Member] | Primary [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 116,477 125,960
Individually impaired loans with related allowance recorded: total recorded investment 110,502 120,221
Related Allowance for loan losses 16,745 20,327
Individually impaired loans with no related allowance recorded: unpaid principal balance 15,891 16,704
Individually impaired loans with no related allowance recorded: total recorded investment 14,725 14,876
Single-Family [Member] | Primary [Member] | Interest Receivable [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance for loan losses   309
Single-Family [Member] | Government [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 322 281
Individually impaired loans with related allowance recorded: total recorded investment 327 285
Related Allowance for loan losses 59 46
Individually impaired loans with no related allowance recorded: unpaid principal balance 58 61
Individually impaired loans with no related allowance recorded: total recorded investment 54 57
Single-Family [Member] | Government [Member] | Interest Receivable [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance for loan losses   12
Single-Family [Member] | Alt-A [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 31,888 35,492
Individually impaired loans with related allowance recorded: total recorded investment 29,103 32,816
Related Allowance for loan losses 6,217 7,778
Individually impaired loans with no related allowance recorded: unpaid principal balance 3,721 3,993
Individually impaired loans with no related allowance recorded: total recorded investment 3,169 3,119
Single-Family [Member] | Alt-A [Member] | Interest Receivable [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance for loan losses   136
Single-Family [Member] | Other [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 12,893 14,667
Individually impaired loans with related allowance recorded: total recorded investment 12,179 13,947
Related Allowance for loan losses 2,416 3,049
Individually impaired loans with no related allowance recorded: unpaid principal balance 1,222 1,240
Individually impaired loans with no related allowance recorded: total recorded investment 1,102 1,056
Single-Family [Member] | Other [Member] | Interest Receivable [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance for loan losses   38
Multifamily [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 650 1,230
Individually impaired loans with related allowance recorded: total recorded investment 654 1,241
Related Allowance for loan losses 80 175
Individually impaired loans with no related allowance recorded: unpaid principal balance 353 565
Individually impaired loans with no related allowance recorded: total recorded investment $ 354 568
Multifamily [Member] | Interest Receivable [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance for loan losses   $ 6