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Mortgage Loans Individually Impaired Loans - 2 (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment $ 159,325 $ 172,061 $ 178,036
Individually impaired loans with related allowance recorded: total interest income recognized 5,628 5,882 6,011
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 393 631 791
Individually impaired loans with no related allowance recorded: average recorded investment 21,199 19,164 16,376
Individually impaired loans with no related allowance recorded: total interest income recognized 1,346 1,178 1,920
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 105 274 292
Individually impaired loans: average recorded investment 180,524 191,225 194,412
Individually impaired loans: total interest income recognized 6,974 7,060 7,931
Individually impaired loans: interest income recognized on a cash basis 498 905 1,083
Table Footnote [Abstract]      
Individually impaired loans: total interest income recognized 6,974 7,060 7,931
Single Family [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 158,352 170,362 175,484
Individually impaired loans with related allowance recorded: total interest income recognized 5,612 5,802 5,883
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 393 630 790
Individually impaired loans with no related allowance recorded: average recorded investment 20,757 17,692 14,513
Individually impaired loans with no related allowance recorded: total interest income recognized 1,336 1,114 1,823
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 105 274 289
Individually impaired loans: total interest income recognized 6,900 6,900 7,700
Table Footnote [Abstract]      
Troubled debt restructuring recorded investment 170,300 185,200 187,600
Individually impaired loans: total interest income recognized 6,900 6,900 7,700
Individually impaired loans: contractual interest income 5,700 5,800 5,700
Individually impaired loans: effective yield adjustments 1,200 1,100 2,000
Single Family [Member] | Primary [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 114,737 121,926 124,659
Individually impaired loans with related allowance recorded: total interest income recognized 4,190 4,321 4,351
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 318 494 603
Individually impaired loans with no related allowance recorded: average recorded investment 15,796 13,852 11,442
Individually impaired loans with no related allowance recorded: total interest income recognized 1,039 864 1,369
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 91 215 227
Single Family [Member] | Government [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 299 270 213
Individually impaired loans with related allowance recorded: total interest income recognized 12 13 11
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 55 67 112
Individually impaired loans with no related allowance recorded: total interest income recognized 4 5 8
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 30,453 33,676 35,075
Individually impaired loans with related allowance recorded: total interest income recognized 1,034 1,066 1,096
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 54 100 135
Individually impaired loans with no related allowance recorded: average recorded investment 3,647 2,799 2,207
Individually impaired loans with no related allowance recorded: total interest income recognized 218 189 329
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 11 47 45
Single Family [Member] | Other [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 12,863 14,490 15,537
Individually impaired loans with related allowance recorded: total interest income recognized 376 402 425
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 21 36 52
Individually impaired loans with no related allowance recorded: average recorded investment 1,259 974 752
Individually impaired loans with no related allowance recorded: total interest income recognized 75 56 117
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 3 12 17
Multifamily [Member]      
Financing Receivable, Impaired [Line Items]      
Individually impaired loans with related allowance recorded: average recorded investment 973 1,699 2,552
Individually impaired loans with related allowance recorded: total interest income recognized 16 80 128
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 0 1 1
Individually impaired loans with no related allowance recorded: average recorded investment 442 1,472 1,863
Individually impaired loans with no related allowance recorded: total interest income recognized 10 64 97
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 0 0 3
Table Footnote [Abstract]      
Troubled debt restructuring recorded investment $ 451 $ 716 $ 911