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Mortgage Loans Individually Impaired Loans - 2 (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment $ 142,660 $ 157,504 $ 146,891 $ 160,895  
Individually impaired loans with related allowance recorded: total interest income recognized 1,339 1,469 4,093 4,232  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 82 91 298 304  
Individually impaired loans with no related allowance recorded: average recorded investment 20,333 20,999 20,265 21,492  
Individually impaired loans with no related allowance recorded: total interest income recognized 432 370 1,230 1,004  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 19 17 80 86  
Individually impaired loans: average recorded investment 162,993 178,503 167,156 182,387  
Individually impaired loans: total interest income recognized 1,771 1,839 5,323 5,236  
Individually impaired loans: interest income recognized on a cash basis 101 108 378 390  
Table Footnote [Abstract]          
Individually impaired loans: total interest income recognized 1,771 1,839 5,323 5,236  
Single-family [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 142,168 156,626 146,336 159,842  
Individually impaired loans with related allowance recorded: total interest income recognized 1,336 1,460 4,072 4,217  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 82 91 298 304  
Individually impaired loans with no related allowance recorded: average recorded investment 20,022 20,613 19,935 21,029  
Individually impaired loans with no related allowance recorded: total interest income recognized 429 365 1,221 996  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 19 17 80 86  
Individually impaired loans: total interest income recognized 1,800 1,800 5,300 5,200  
Table Footnote [Abstract]          
Troubled debt restructuring recorded investment 159,600   159,600   $ 170,300
Individually impaired loans: total interest income recognized 1,800 1,800 5,300 5,200  
Individually impaired loans: contractual interest income 1,400 1,500 4,300 4,300  
Individually impaired loans: effective yield adjustments 320 327 961 907  
Single-family [Member] | Primary [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 103,523 113,634 106,498 115,762  
Individually impaired loans with related allowance recorded: total interest income recognized 992 1,090 3,028 3,152  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 68 71 243 248  
Individually impaired loans with no related allowance recorded: average recorded investment 15,534 15,627 15,398 15,967  
Individually impaired loans with no related allowance recorded: total interest income recognized 320 279 915 779  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 19 16 69 76  
Single-family [Member] | Government [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 310 299 317 290  
Individually impaired loans with related allowance recorded: total interest income recognized 3 3 9 9  
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 61 53 59 55  
Individually impaired loans with no related allowance recorded: total interest income recognized 1 1 3 3  
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 27,115 30,041 27,899 30,760  
Individually impaired loans with related allowance recorded: total interest income recognized 250 272 759 774  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 10 14 40 41  
Individually impaired loans with no related allowance recorded: average recorded investment 3,312 3,674 3,350 3,720  
Individually impaired loans with no related allowance recorded: total interest income recognized 81 64 224 158  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 0 1 8 8  
Single-family [Member] | Other [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 11,220 12,652 11,622 13,030  
Individually impaired loans with related allowance recorded: total interest income recognized 91 95 276 282  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 4 6 15 15  
Individually impaired loans with no related allowance recorded: average recorded investment 1,115 1,259 1,128 1,287  
Individually impaired loans with no related allowance recorded: total interest income recognized 27 21 79 56  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 0 0 3 2  
Multifamily [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 492 878 555 1,053  
Individually impaired loans with related allowance recorded: total interest income recognized 3 9 21 15  
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 311 386 330 463  
Individually impaired loans with no related allowance recorded: total interest income recognized 3 5 9 8  
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 $ 324   $ 324   $ 451