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Mortgage Loans Individually Impaired Loans - 2 (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment $ 144,792 $ 159,325 $ 172,061
Individually impaired loans with related allowance recorded: total interest income recognized 5,420 5,628 5,882
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 399 393 631
Individually impaired loans with no related allowance recorded: average recorded investment 20,078 21,199 19,164
Individually impaired loans with no related allowance recorded: total interest income recognized 1,670 1,346 1,178
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 103 105 274
Individually impaired loans: average recorded investment 164,870 180,524 191,225
Individually impaired loans: total interest income recognized 7,090 6,974 7,060
Individually impaired loans: interest income recognized on a cash basis 502 498 905
Table Footnote [Abstract]      
Individually impaired loans: total interest income recognized 7,090 6,974 7,060
Single Family [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 144,284 158,352 170,362
Individually impaired loans with related allowance recorded: total interest income recognized 5,391 5,612 5,802
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 399 393 630
Individually impaired loans with no related allowance recorded: average recorded investment 19,761 20,757 17,692
Individually impaired loans with no related allowance recorded: total interest income recognized 1,657 1,336 1,114
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 103 105 274
Individually impaired loans: total interest income recognized 7,000 6,900 6,900
Table Footnote [Abstract]      
Troubled debt restructuring recorded investment 155,000 170,300  
Individually impaired loans: total interest income recognized 7,000 6,900 6,900
Individually impaired loans: contractual interest income 5,700 5,700 5,800
Individually impaired loans: effective yield adjustments 1,300 1,200 1,100
Single Family [Member] | Primary [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 105,076 114,737 121,926
Individually impaired loans with related allowance recorded: total interest income recognized 4,004 4,190 4,321
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 325 318 494
Individually impaired loans with no related allowance recorded: average recorded investment 15,293 15,796 13,852
Individually impaired loans with no related allowance recorded: total interest income recognized 1,236 1,039 864
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 91 91 215
Single Family [Member] | Government [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 314 299 270
Individually impaired loans with related allowance recorded: total interest income recognized 12 12 13
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 59 55 67
Individually impaired loans with no related allowance recorded: total interest income recognized 4 4 5
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 27,512 30,453 33,676
Individually impaired loans with related allowance recorded: total interest income recognized 1,010 1,034 1,066
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 54 54 100
Individually impaired loans with no related allowance recorded: average recorded investment 3,293 3,647 2,799
Individually impaired loans with no related allowance recorded: total interest income recognized 309 218 189
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 9 11 47
Single Family [Member] | Other [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 11,382 12,863 14,490
Individually impaired loans with related allowance recorded: total interest income recognized 365 376 402
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 20 21 36
Individually impaired loans with no related allowance recorded: average recorded investment 1,116 1,259 974
Individually impaired loans with no related allowance recorded: total interest income recognized 108 75 56
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 3 3 12
Multifamily [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 508 973 1,699
Individually impaired loans with related allowance recorded: total interest income recognized 29 16 80
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 0 0 1
Individually impaired loans with no related allowance recorded: average recorded investment 317 442 1,472
Individually impaired loans with no related allowance recorded: total interest income recognized 13 10 64
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 $ 248 $ 451