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Mortgage Loans Individually Impaired Loans - 2 (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment $ 134,556 $ 150,935  
Individually impaired loans with related allowance recorded: total interest income recognized 1,327 1,374  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 108 131  
Individually impaired loans with no related allowance recorded: average recorded investment 19,486 20,150  
Individually impaired loans with no related allowance recorded: total interest income recognized 389 356  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 27 24  
Individually impaired loans: average recorded investment 154,042 171,085  
Individually impaired loans: total interest income recognized 1,716 1,730  
Individually impaired loans: interest income recognized on a cash basis 135 155  
Table Footnote [Abstract]      
Individually impaired loans: total interest income recognized 1,716 1,730  
Single-family [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 134,245 150,319  
Individually impaired loans with related allowance recorded: total interest income recognized 1,325 1,369  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 108 131  
Individually impaired loans with no related allowance recorded: average recorded investment 19,203 19,800  
Individually impaired loans with no related allowance recorded: total interest income recognized 386 353  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 27 24  
Individually impaired loans: total interest income recognized 1,700 1,700  
Table Footnote [Abstract]      
Troubled debt restructuring recorded investment 150,000   $ 155,000
Individually impaired loans: total interest income recognized 1,700 1,700  
Individually impaired loans: contractual interest income 1,400 1,400  
Individually impaired loans: effective yield adjustments 268 310  
Single-family [Member] | Primary [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 98,223 109,318  
Individually impaired loans with related allowance recorded: total interest income recognized 986 1,021  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 88 104  
Individually impaired loans with no related allowance recorded: average recorded investment 14,988 15,241  
Individually impaired loans with no related allowance recorded: total interest income recognized 289 268  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 23 20  
Single-family [Member] | Government [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 301 323  
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 61 57  
Individually impaired loans with no related allowance recorded: total interest income recognized 1 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 25,550 28,665  
Individually impaired loans with related allowance recorded: total interest income recognized 249 253  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 15 19  
Individually impaired loans with no related allowance recorded: average recorded investment 3,087 3,367  
Individually impaired loans with no related allowance recorded: total interest income recognized 73 62  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 3 3  
Single-family [Member] | Other [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 10,171 12,013  
Individually impaired loans with related allowance recorded: total interest income recognized 87 92  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 5 8  
Individually impaired loans with no related allowance recorded: average recorded investment 1,067 1,135  
Individually impaired loans with no related allowance recorded: total interest income recognized 23 22  
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 311 616  
Individually impaired loans with related allowance recorded: total interest income recognized 2 5  
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 283 350  
Individually impaired loans with no related allowance recorded: total interest income recognized 3 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 $ 244   $ 248