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Mortgage Loans Individually Impaired Loans - 2 (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment $ 128,821 $ 147,087 $ 131,674 $ 149,007  
Individually impaired loans with related allowance recorded: total interest income recognized 1,283 1,380 2,610 2,754  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 96 85 204 216  
Individually impaired loans with no related allowance recorded: average recorded investment 19,478 20,249 19,486 20,209  
Individually impaired loans with no related allowance recorded: total interest income recognized 369 442 758 798  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 27 37 54 61  
Individually impaired loans: average recorded investment 148,299 167,336 151,160 169,216  
Individually impaired loans: total interest income recognized 1,652 1,822 3,368 3,552  
Individually impaired loans: interest income recognized on a cash basis 123 122 258 277  
Table Footnote [Abstract]          
Individually impaired loans: total interest income recognized 1,652 1,822 3,368 3,552  
Single-family [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 128,562 146,531 131,394 148,418  
Individually impaired loans with related allowance recorded: total interest income recognized 1,279 1,367 2,604 2,736  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 96 85 204 216  
Individually impaired loans with no related allowance recorded: average recorded investment 19,194 19,923 19,208 19,874  
Individually impaired loans with no related allowance recorded: total interest income recognized 362 439 748 792  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 27 37 54 61  
Individually impaired loans: total interest income recognized 1,700 1,800 3,400 3,500  
Table Footnote [Abstract]          
Troubled debt restructuring recorded investment 144,300   144,300   $ 155,000
Individually impaired loans: total interest income recognized 1,700 1,800 3,400 3,500  
Individually impaired loans: contractual interest income 1,500 1,500 2,900 2,900  
Individually impaired loans: effective yield adjustments 229 331 497 641  
Single-family [Member] | Primary [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 94,599 106,674 96,395 107,984  
Individually impaired loans with related allowance recorded: total interest income recognized 955 1,015 1,941 2,036  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 77 71 165 175  
Individually impaired loans with no related allowance recorded: average recorded investment 15,091 15,377 15,050 15,323  
Individually impaired loans with no related allowance recorded: total interest income recognized 273 327 562 595  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 24 30 47 50  
Single-family [Member] | Government [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 295 317 298 320  
Individually impaired loans with related allowance recorded: total interest income recognized 2 3 5 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 61 59 61 58  
Individually impaired loans with no related allowance recorded: total interest income recognized 1 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 24,249 27,901 24,896 28,287  
Individually impaired loans with related allowance recorded: total interest income recognized 240 256 489 509  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 14 11 29 30  
Individually impaired loans with no related allowance recorded: average recorded investment 3,026 3,361 3,056 3,362  
Individually impaired loans with no related allowance recorded: total interest income recognized 67 81 140 143  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 2 5 5 8  
Single-family [Member] | Other [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 9,419 11,639 9,805 11,827  
Individually impaired loans with related allowance recorded: total interest income recognized 82 93 169 185  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 5 3 10 11  
Individually impaired loans with no related allowance recorded: average recorded investment 1,016 1,126 1,041 1,131  
Individually impaired loans with no related allowance recorded: total interest income recognized 21 30 44 52  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 1 2 2 3  
Multifamily [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 259 556 280 589  
Individually impaired loans with related allowance recorded: total interest income recognized 4 13 6 18  
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 284 326 278 335  
Individually impaired loans with no related allowance recorded: total interest income recognized 7 3 10 6  
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 $ 198   $ 198   $ 248