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Mortgage Loans Individually Impaired Loans - 2 (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment $ 150,935 $ 164,139  
Individually impaired loans with related allowance recorded: total interest income recognized 1,374 1,385  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 131 128  
Individually impaired loans with no related allowance recorded: average recorded investment 20,150 21,886  
Individually impaired loans with no related allowance recorded: total interest income recognized 356 311  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 24 50  
Individually impaired loans: average recorded investment 171,085 186,025  
Individually impaired loans: total interest income recognized 1,730 1,696  
Individually impaired loans: interest income recognized on a cash basis 155 178  
Table Footnote [Abstract]      
Individually impaired loans: total interest income recognized 1,730 1,696  
Single-family [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 150,319 162,910  
Individually impaired loans with related allowance recorded: total interest income recognized 1,369 1,382  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 131 128  
Individually impaired loans with no related allowance recorded: average recorded investment 19,800 21,345  
Individually impaired loans with no related allowance recorded: total interest income recognized 353 310  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 24 50  
Individually impaired loans: total interest income recognized 1,700 1,700  
Table Footnote [Abstract]      
Troubled debt restructuring recorded investment 167,500   $ 170,300
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 310 276  
Single-family [Member] | Primary [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 109,318 117,721  
Individually impaired loans with related allowance recorded: total interest income recognized 1,021 1,034  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 104 104  
Individually impaired loans with no related allowance recorded: average recorded investment 15,241 16,249  
Individually impaired loans with no related allowance recorded: total interest income recognized 268 247  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 20 41  
Single-family [Member] | Government [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 323 282  
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 57 59  
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 28,665 31,491  
Individually impaired loans with related allowance recorded: total interest income recognized 253 251  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 19 17  
Individually impaired loans with no related allowance recorded: average recorded investment 3,367 3,736  
Individually impaired loans with no related allowance recorded: total interest income recognized 62 44  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 3 7  
Single-family [Member] | Other [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 12,013 13,416  
Individually impaired loans with related allowance recorded: total interest income recognized 92 94  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 8 7  
Individually impaired loans with no related allowance recorded: average recorded investment 1,135 1,301  
Individually impaired loans with no related allowance recorded: total interest income recognized 22 18  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 1 2  
Multifamily [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 616 1,229  
Individually impaired loans with related allowance recorded: total interest income recognized 5 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 350 541  
Individually impaired loans with no related allowance recorded: total interest income recognized 3 1  
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 $ 411   $ 451