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Mortgage Loans Individually Impaired Loans - 2 (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment $ 110,467 $ 126,152 $ 144,792
Individually impaired loans with related allowance recorded: total interest income recognized 4,564 4,987 5,420
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 457 394 399
Individually impaired loans with no related allowance recorded: average recorded investment 18,830 19,521 20,078
Individually impaired loans with no related allowance recorded: total interest income recognized 1,259 1,483 1,670
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 141 113 103
Individually impaired loans: average recorded investment 129,297 145,673 164,870
Individually impaired loans: total interest income recognized 5,823 6,470 7,090
Individually impaired loans: interest income recognized on a cash basis 598 507 502
Single Family [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 110,232 125,879 144,284
Individually impaired loans with related allowance recorded: total interest income recognized 4,561 4,978 5,391
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 457 394 399
Individually impaired loans with no related allowance recorded: average recorded investment 18,494 19,224 19,761
Individually impaired loans with no related allowance recorded: total interest income recognized 1,245 1,464 1,657
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 141 113 103
Single Family [Member] | Primary [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 85,063 92,893 105,076
Individually impaired loans with related allowance recorded: total interest income recognized 3,522 3,721 4,004
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 381 319 325
Individually impaired loans with no related allowance recorded: average recorded investment 15,005 15,166 15,293
Individually impaired loans with no related allowance recorded: total interest income recognized 967 1,107 1,236
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 119 96 91
Single Family [Member] | Government [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 276 292 314
Individually impaired loans with related allowance recorded: total interest income recognized 17 10 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 57 61 59
Individually impaired loans with no related allowance recorded: total interest income recognized 4 3 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 18,202 23,536 27,512
Individually impaired loans with related allowance recorded: total interest income recognized 772 929 1,010
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 57 56 54
Individually impaired loans with no related allowance recorded: average recorded investment 2,625 3,000 3,293
Individually impaired loans with no related allowance recorded: total interest income recognized 218 270 309
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 17 13 9
Single Family [Member] | Other [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 6,691 9,158 11,382
Individually impaired loans with related allowance recorded: total interest income recognized 250 318 365
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 19 19 20
Individually impaired loans with no related allowance recorded: average recorded investment 807 997 1,116
Individually impaired loans with no related allowance recorded: total interest income recognized 56 84 108
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 5 4 3
Multifamily [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 235 273 508
Individually impaired loans with related allowance recorded: total interest income recognized 3 9 29
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 336 297 317
Individually impaired loans with no related allowance recorded: total interest income recognized 14 19 13
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis $ 0 $ 0 $ 0