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Mortgage Loans Individually Impaired Loans (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance $ 123,981 $ 123,314
Individually impaired loans with related allowance recorded: total recorded investment 117,537 116,474
Related allowance for loan losses (17,467) (17,289)
Individually impaired loans with no related allowance recorded: unpaid principal balance 20,181 20,642
Individually impaired loans with no related allowance recorded: total recorded investment 18,969 19,307
Total individually impaired loans: unpaid principal balance 144,162 143,956
Total individually impaired loans: total recorded investment 136,506 135,781
Single-family [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 123,746 123,035
Individually impaired loans with related allowance recorded: total recorded investment 117,301 116,194
Related allowance for loan losses (17,426) (17,247)
Individually impaired loans with no related allowance recorded: unpaid principal balance 19,830 20,334
Individually impaired loans with no related allowance recorded: total recorded investment 18,616 18,997
Single-family [Member] | Primary [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 93,426 91,194
Individually impaired loans with related allowance recorded: total recorded investment 89,354 86,864
Related allowance for loan losses (12,026) (11,652)
Individually impaired loans with no related allowance recorded: unpaid principal balance 15,672 16,027
Individually impaired loans with no related allowance recorded: total recorded investment 14,878 15,158
Single-family [Member] | Government [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 271 276
Individually impaired loans with related allowance recorded: total recorded investment 273 279
Related allowance for loan losses (55) (56)
Individually impaired loans with no related allowance recorded: unpaid principal balance 66 66
Individually impaired loans with no related allowance recorded: total recorded investment 60 60
Single-family [Member] | Alt-A [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 22,005 23,077
Individually impaired loans with related allowance recorded: total recorded investment 20,086 21,045
Related allowance for loan losses (3,907) (4,046)
Individually impaired loans with no related allowance recorded: unpaid principal balance 3,141 3,253
Individually impaired loans with no related allowance recorded: total recorded investment 2,796 2,870
Single-family [Member] | Other [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 8,044 8,488
Individually impaired loans with related allowance recorded: total recorded investment 7,588 8,006
Related allowance for loan losses (1,438) (1,493)
Individually impaired loans with no related allowance recorded: unpaid principal balance 951 988
Individually impaired loans with no related allowance recorded: total recorded investment 882 909
Multifamily [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 235 279
Individually impaired loans with related allowance recorded: total recorded investment 236 280
Related allowance for loan losses (41) (42)
Individually impaired loans with no related allowance recorded: unpaid principal balance 351 308
Individually impaired loans with no related allowance recorded: total recorded investment $ 353 $ 310