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Mortgage Loans Individually Impaired Loans - 2 (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment $ 147,087 $ 160,870 $ 149,007 $ 162,546  
Individually impaired loans with related allowance recorded: total interest income recognized 1,380 1,378 2,754 2,763  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 85 85 216 213  
Individually impaired loans with no related allowance recorded: average recorded investment 20,249 22,355 20,209 21,816  
Individually impaired loans with no related allowance recorded: total interest income recognized 442 323 798 634  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 37 19 61 69  
Individually impaired loans: average recorded investment 167,336 183,225 169,216 184,362  
Individually impaired loans: total interest income recognized 1,822 1,701 3,552 3,397  
Individually impaired loans: interest income recognized on a cash basis 122 104 277 282  
Table Footnote [Abstract]          
Individually impaired loans: total interest income recognized 1,822 1,701 3,552 3,397  
Single-family [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 146,531 159,780 148,418 161,406  
Individually impaired loans with related allowance recorded: total interest income recognized 1,367 1,375 2,736 2,757  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 85 85 216 213  
Individually impaired loans with no related allowance recorded: average recorded investment 19,923 21,895 19,874 21,320  
Individually impaired loans with no related allowance recorded: total interest income recognized 439 321 792 631  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 37 19 61 69  
Individually impaired loans: total interest income recognized 1,800 1,700 3,500 3,400  
Table Footnote [Abstract]          
Troubled debt restructuring recorded investment 163,400   163,400   $ 170,300
Individually impaired loans: total interest income recognized 1,800 1,700 3,500 3,400  
Individually impaired loans: contractual interest income 1,500 1,400 2,900 2,800  
Individually impaired loans: effective yield adjustments 331 304 641 580  
Single-family [Member] | Primary [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 106,674 115,856 107,984 116,811  
Individually impaired loans with related allowance recorded: total interest income recognized 1,015 1,028 2,036 2,062  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 71 73 175 177  
Individually impaired loans with no related allowance recorded: average recorded investment 15,377 16,453 15,323 16,178  
Individually impaired loans with no related allowance recorded: total interest income recognized 327 253 595 500  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 30 19 50 60  
Single-family [Member] | Government [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 317 288 320 285  
Individually impaired loans with related allowance recorded: total interest income recognized 3 3 6 6  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 0 0 0 0  
Individually impaired loans with no related allowance recorded: average recorded investment 59 54 58 56  
Individually impaired loans with no related allowance recorded: total interest income recognized 1 1 2 2  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 0 0 0 0  
Single-family [Member] | Alt-A [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 27,901 30,642 28,287 31,094  
Individually impaired loans with related allowance recorded: total interest income recognized 256 251 509 502  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 11 10 30 27  
Individually impaired loans with no related allowance recorded: average recorded investment 3,361 4,010 3,362 3,775  
Individually impaired loans with no related allowance recorded: total interest income recognized 81 50 143 94  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 5 0 8 7  
Single-family [Member] | Other [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 11,639 12,994 11,827 13,216  
Individually impaired loans with related allowance recorded: total interest income recognized 93 93 185 187  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 3 2 11 9  
Individually impaired loans with no related allowance recorded: average recorded investment 1,126 1,378 1,131 1,311  
Individually impaired loans with no related allowance recorded: total interest income recognized 30 17 52 35  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 2 0 3 2  
Multifamily [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 556 1,090 589 1,140  
Individually impaired loans with related allowance recorded: total interest income recognized 13 3 18 6  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 0 0 0 0  
Individually impaired loans with no related allowance recorded: average recorded investment 326 460 335 496  
Individually impaired loans with no related allowance recorded: total interest income recognized 3 2 6 3  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 0 $ 0 0 $ 0  
Table Footnote [Abstract]          
Troubled debt restructuring recorded investment $ 415   $ 415   $ 451