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Mortgage Loans Individually Impaired Loans - 2 (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment $ 126,152 $ 144,792 $ 159,325
Individually impaired loans with related allowance recorded: total interest income recognized 4,987 5,420 5,628
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 394 399 393
Individually impaired loans with no related allowance recorded: average recorded investment 19,521 20,078 21,199
Individually impaired loans with no related allowance recorded: total interest income recognized 1,483 1,670 1,346
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 113 103 105
Individually impaired loans: average recorded investment 145,673 164,870 180,524
Individually impaired loans: total interest income recognized 6,470 7,090 6,974
Individually impaired loans: interest income recognized on a cash basis 507 502 498
Table Footnote [Abstract]      
Individually impaired loans: total interest income recognized 6,470 7,090 6,974
Single Family [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 125,879 144,284 158,352
Individually impaired loans with related allowance recorded: total interest income recognized 4,978 5,391 5,612
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 394 399 393
Individually impaired loans with no related allowance recorded: average recorded investment 19,224 19,761 20,757
Individually impaired loans with no related allowance recorded: total interest income recognized 1,464 1,657 1,336
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 113 103 105
Individually impaired loans: total interest income recognized 6,400 7,000 6,900
Table Footnote [Abstract]      
Troubled debt restructuring recorded investment 134,700 155,000  
Individually impaired loans: total interest income recognized 6,400 7,000 6,900
Individually impaired loans: contractual interest income 5,500 5,700 5,700
Individually impaired loans: effective yield adjustments 925 1,300 1,200
Single Family [Member] | Primary [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 92,893 105,076 114,737
Individually impaired loans with related allowance recorded: total interest income recognized 3,721 4,004 4,190
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 319 325 318
Individually impaired loans with no related allowance recorded: average recorded investment 15,166 15,293 15,796
Individually impaired loans with no related allowance recorded: total interest income recognized 1,107 1,236 1,039
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 96 91 91
Single Family [Member] | Government [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 292 314 299
Individually impaired loans with related allowance recorded: total interest income recognized 10 12 12
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 0 0 0
Individually impaired loans with no related allowance recorded: average recorded investment 61 59 55
Individually impaired loans with no related allowance recorded: total interest income recognized 3 4 4
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 0 0 0
Single Family [Member] | Alt-A [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 23,536 27,512 30,453
Individually impaired loans with related allowance recorded: total interest income recognized 929 1,010 1,034
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 56 54 54
Individually impaired loans with no related allowance recorded: average recorded investment 3,000 3,293 3,647
Individually impaired loans with no related allowance recorded: total interest income recognized 270 309 218
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 13 9 11
Single Family [Member] | Other [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 9,158 11,382 12,863
Individually impaired loans with related allowance recorded: total interest income recognized 318 365 376
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 19 20 21
Individually impaired loans with no related allowance recorded: average recorded investment 997 1,116 1,259
Individually impaired loans with no related allowance recorded: total interest income recognized 84 108 75
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 4 3 3
Multifamily [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 273 508 973
Individually impaired loans with related allowance recorded: total interest income recognized 9 29 16
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 0 0 0
Individually impaired loans with no related allowance recorded: average recorded investment 297 317 442
Individually impaired loans with no related allowance recorded: total interest income recognized 19 13 10
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 0 0 $ 0
Table Footnote [Abstract]      
Troubled debt restructuring recorded investment $ 185 $ 248