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Mortgage Loans Individually Impaired Loans - 2 (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment $ 115,651 $ 128,821 $ 116,444 $ 131,674  
Individually impaired loans with related allowance recorded: total interest income recognized 1,217 1,283 2,414 2,610  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 131 96 259 204  
Individually impaired loans with no related allowance recorded: average recorded investment 18,934 19,478 19,045 19,486  
Individually impaired loans with no related allowance recorded: total interest income recognized 322 369 641 758  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 38 27 69 54  
Individually impaired loans: average recorded investment 134,585 148,299 135,489 151,160  
Individually impaired loans: total interest income recognized 1,539 1,652 3,055 3,368  
Individually impaired loans: interest income recognized on a cash basis 169 123 328 258  
Table Footnote [Abstract]          
Individually impaired loans: total interest income recognized 1,539 1,652 3,055 3,368  
Single-family [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 115,419 128,562 116,196 131,394  
Individually impaired loans with related allowance recorded: total interest income recognized 1,216 1,279 2,413 2,604  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 131 96 259 204  
Individually impaired loans with no related allowance recorded: average recorded investment 18,579 19,194 18,705 19,208  
Individually impaired loans with no related allowance recorded: total interest income recognized 321 362 638 748  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 38 27 69 54  
Individually impaired loans: total interest income recognized 1,500 1,700 3,100 3,400  
Table Footnote [Abstract]          
Troubled debt restructuring recorded investment 128,500   128,500   $ 134,700
Individually impaired loans: total interest income recognized 1,500 1,700 3,100 3,400  
Individually impaired loans: contractual interest income 1,400 1,500 2,700 2,900  
Individually impaired loans: effective yield adjustments 186 229 352 497  
Single-family [Member] | Primary [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 88,526 94,599 88,342 96,395  
Individually impaired loans with related allowance recorded: total interest income recognized 915 955 1,826 1,941  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 109 77 216 165  
Individually impaired loans with no related allowance recorded: average recorded investment 14,942 15,091 14,988 15,050  
Individually impaired loans with no related allowance recorded: total interest income recognized 243 273 486 562  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 32 24 58 47  
Single-family [Member] | Government [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 279 295 278 298  
Individually impaired loans with related allowance recorded: total interest income recognized 9 2 12 5  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 0 0 0 0  
Individually impaired loans with no related allowance recorded: average recorded investment 57 61 58 61  
Individually impaired loans with no related allowance recorded: total interest income recognized 2 1 2 2  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 0 0 0 0  
Single-family [Member] | Alt-A [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 19,349 24,249 20,020 24,896  
Individually impaired loans with related allowance recorded: total interest income recognized 219 240 431 489  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 16 14 32 29  
Individually impaired loans with no related allowance recorded: average recorded investment 2,723 3,026 2,781 3,056  
Individually impaired loans with no related allowance recorded: total interest income recognized 61 67 119 140  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 5 2 9 5  
Single-family [Member] | Other [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 7,265 9,419 7,556 9,805  
Individually impaired loans with related allowance recorded: total interest income recognized 73 82 144 169  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 6 5 11 10  
Individually impaired loans with no related allowance recorded: average recorded investment 857 1,016 878 1,041  
Individually impaired loans with no related allowance recorded: total interest income recognized 15 21 31 44  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 1 1 2 2  
Multifamily [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 232 259 248 280  
Individually impaired loans with related allowance recorded: total interest income recognized 1 4 1 6  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 0 0 0 0  
Individually impaired loans with no related allowance recorded: average recorded investment 355 284 340 278  
Individually impaired loans with no related allowance recorded: total interest income recognized 1 7 3 10  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 0 $ 0 0 $ 0  
Table Footnote [Abstract]          
Troubled debt restructuring recorded investment $ 211   $ 211   $ 185