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Mortgage Loans Individually Impaired Loans (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance $ 127,986 $ 145,421
Individually impaired loans with related allowance recorded: total recorded investment 120,792 136,977
Related allowance for loan losses 18,124 21,953
Individually impaired loans with no related allowance recorded: unpaid principal balance 21,217 20,732
Individually impaired loans with no related allowance recorded: total recorded investment 19,800 19,210
Total individually impaired loans: unpaid principal balance 149,203 166,153
Total individually impaired loans: total recorded investment 140,592 156,187
Single-family [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 127,744 145,101
Individually impaired loans with related allowance recorded: total recorded investment 120,547 136,654
Related allowance for loan losses 18,089 21,920
Individually impaired loans with no related allowance recorded: unpaid principal balance 20,879 20,466
Individually impaired loans with no related allowance recorded: total recorded investment 19,460 18,944
Single-family [Member] | Primary [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 93,983 105,113
Individually impaired loans with related allowance recorded: total recorded investment 89,453 99,825
Related allowance for loan losses 12,102 14,462
Individually impaired loans with no related allowance recorded: unpaid principal balance 16,356 15,733
Individually impaired loans with no related allowance recorded: total recorded investment 15,438 14,758
Single-family [Member] | Government [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 283 302
Individually impaired loans with related allowance recorded: total recorded investment 286 305
Related allowance for loan losses 58 59
Individually impaired loans with no related allowance recorded: unpaid principal balance 67 63
Individually impaired loans with no related allowance recorded: total recorded investment 62 59
Single-family [Member] | Alt-A [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 24,426 28,599
Individually impaired loans with related allowance recorded: total recorded investment 22,269 26,059
Related allowance for loan losses 4,327 5,365
Individually impaired loans with no related allowance recorded: unpaid principal balance 3,402 3,511
Individually impaired loans with no related allowance recorded: total recorded investment 2,992 3,062
Single-family [Member] | Other [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 9,052 11,087
Individually impaired loans with related allowance recorded: total recorded investment 8,539 10,465
Related allowance for loan losses 1,602 2,034
Individually impaired loans with no related allowance recorded: unpaid principal balance 1,054 1,159
Individually impaired loans with no related allowance recorded: total recorded investment 968 1,065
Multifamily [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 242 320
Individually impaired loans with related allowance recorded: total recorded investment 245 323
Related allowance for loan losses 35 33
Individually impaired loans with no related allowance recorded: unpaid principal balance 338 266
Individually impaired loans with no related allowance recorded: total recorded investment $ 340 $ 266