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Mortgage Loans Individually Impaired Loans - 2 (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment $ 88,460 $ 110,467 $ 126,152
Individually impaired loans with related allowance recorded: total interest income recognized 3,666 4,564 4,987
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 315 457 394
Individually impaired loans with no related allowance recorded: average recorded investment 19,450 18,830 19,521
Individually impaired loans with no related allowance recorded: total interest income recognized 1,250 1,259 1,483
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 169 141 113
Individually impaired loans: average recorded investment 107,910 129,297 145,673
Individually impaired loans: total interest income recognized 4,916 5,823 6,470
Individually impaired loans: interest income recognized on a cash basis 484 598 507
Single Family [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 88,173 110,232 125,879
Individually impaired loans with related allowance recorded: total interest income recognized 3,659 4,561 4,978
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 315 457 394
Individually impaired loans with no related allowance recorded: average recorded investment 19,075 18,494 19,224
Individually impaired loans with no related allowance recorded: total interest income recognized 1,219 1,245 1,464
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 169 141 113
Single Family [Member] | Primary [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 71,048 85,063 92,893
Individually impaired loans with related allowance recorded: total interest income recognized 2,954 3,522 3,721
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 264 381 319
Individually impaired loans with no related allowance recorded: average recorded investment 16,243 15,005 15,166
Individually impaired loans with no related allowance recorded: total interest income recognized 1,008 967 1,107
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 150 119 96
Single Family [Member] | Government [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 263 276 292
Individually impaired loans with related allowance recorded: total interest income recognized 11 17 10
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 57 61
Individually impaired loans with no related allowance recorded: total interest income recognized 4 4 3
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 12,685 18,202 23,536
Individually impaired loans with related allowance recorded: total interest income recognized 540 772 929
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 38 57 56
Individually impaired loans with no related allowance recorded: average recorded investment 2,176 2,625 3,000
Individually impaired loans with no related allowance recorded: total interest income recognized 169 218 270
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 15 17 13
Single Family [Member] | Other [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 4,177 6,691 9,158
Individually impaired loans with related allowance recorded: total interest income recognized 154 250 318
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 13 19 19
Individually impaired loans with no related allowance recorded: average recorded investment 599 807 997
Individually impaired loans with no related allowance recorded: total interest income recognized 38 56 84
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 4 5 4
Multifamily [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 287 235 273
Individually impaired loans with related allowance recorded: total interest income recognized 7 3 9
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 375 336 297
Individually impaired loans with no related allowance recorded: total interest income recognized 31 14 19
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis $ 0 $ 0 $ 0