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Mortgage Loans Individually Impaired Loans - 2 (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment $ 117,507 $ 134,556  
Individually impaired loans with related allowance recorded: total interest income recognized 1,197 1,327  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 128 108  
Individually impaired loans with no related allowance recorded: average recorded investment 19,140 19,486  
Individually impaired loans with no related allowance recorded: total interest income recognized 319 389  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 31 27  
Individually impaired loans: average recorded investment 136,647 154,042  
Individually impaired loans: total interest income recognized 1,516 1,716  
Individually impaired loans: interest income recognized on a cash basis 159 135  
Table Footnote [Abstract]      
Individually impaired loans: total interest income recognized 1,516 1,716  
Single-family [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 117,249 134,245  
Individually impaired loans with related allowance recorded: total interest income recognized 1,197 1,325  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 128 108  
Individually impaired loans with no related allowance recorded: average recorded investment 18,809 19,203  
Individually impaired loans with no related allowance recorded: total interest income recognized 317 386  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 31 27  
Individually impaired loans: total interest income recognized 1,500 1,700  
Table Footnote [Abstract]      
Troubled debt restructuring recorded investment 135,500   $ 134,700
Individually impaired loans: total interest income recognized 1,500 1,700  
Individually impaired loans: contractual interest income 1,300 1,400  
Individually impaired loans: effective yield adjustments 166 268  
Single-family [Member] | Primary [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 88,411 98,223  
Individually impaired loans with related allowance recorded: total interest income recognized 911 986  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 107 88  
Individually impaired loans with no related allowance recorded: average recorded investment 15,007 14,988  
Individually impaired loans with no related allowance recorded: total interest income recognized 243 289  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 26 23  
Single-family [Member] | Government [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 276 301  
Individually impaired loans with related allowance recorded: total interest income recognized 3 3  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 0 0  
Individually impaired loans with no related allowance recorded: average recorded investment 60 61  
Individually impaired loans with no related allowance recorded: total interest income recognized 0 1  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 0 0  
Single-family [Member] | Alt-A [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 20,708 25,550  
Individually impaired loans with related allowance recorded: total interest income recognized 212 249  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 16 15  
Individually impaired loans with no related allowance recorded: average recorded investment 2,842 3,087  
Individually impaired loans with no related allowance recorded: total interest income recognized 58 73  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 4 3  
Single-family [Member] | Other [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 7,854 10,171  
Individually impaired loans with related allowance recorded: total interest income recognized 71 87  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 5 5  
Individually impaired loans with no related allowance recorded: average recorded investment 900 1,067  
Individually impaired loans with no related allowance recorded: total interest income recognized 16 23  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 1 1  
Multifamily [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 258 311  
Individually impaired loans with related allowance recorded: total interest income recognized 0 2  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 0 0  
Individually impaired loans with no related allowance recorded: average recorded investment 331 283  
Individually impaired loans with no related allowance recorded: total interest income recognized 2 3  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 0 $ 0  
Table Footnote [Abstract]      
Troubled debt restructuring recorded investment $ 212   $ 185