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Mortgage Loans Individually Impaired Loans - 2 (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment $ 157,504 $ 170,875 $ 160,895 $ 173,083  
Individually impaired loans with no related allowance recorded: average recorded investment 20,999 19,964 21,492 18,914  
Individually impaired loans with related allowance recorded: total interest income recognized 1,469 1,465 4,232 4,446  
Individually impaired loans with no related allowance recorded: total interest income recognized 370 312 1,004 853  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 91 143 304 474  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 17 73 86 199  
Individually impaired loans: average recorded investment 178,503 190,839 182,387 191,997  
Individually impaired loans: total interest income recognized 1,839 1,777 5,236 5,299  
Individually impaired loans: interest income recognized on a cash basis 108 216 390 673  
Table Footnote [Abstract]          
Individually impaired loans: total interest income recognized 1,839 1,777 5,236 5,299  
Single-family [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans: total interest income recognized 1,800 1,800      
Table Footnote [Abstract]          
Individually impaired loans: total interest income recognized 1,800 1,800      
Individually impaired loans: contractual interest income 1,500 1,400      
Single-family [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 156,626 169,335 159,842 171,270  
Individually impaired loans with no related allowance recorded: average recorded investment 20,613 18,392 21,029 17,216  
Individually impaired loans with related allowance recorded: total interest income recognized 1,460 1,448 4,217 4,383  
Individually impaired loans with no related allowance recorded: total interest income recognized 365 294 996 795  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 91 143 304 474  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 17 73 86 199  
Individually impaired loans: total interest income recognized     5,200 5,200  
Table Footnote [Abstract]          
Troubled debt restructuring recorded investment 174,600   174,600   $ 185,200
Individually impaired loans: total interest income recognized     5,200 5,200  
Individually impaired loans: contractual interest income     4,300 4,300  
Individually impaired loans: effective yield adjustments 327 297 907 857  
Single-family [Member] | Primary [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 113,634 121,246 115,762 122,443  
Individually impaired loans with no related allowance recorded: average recorded investment 15,627 14,442 15,967 13,514  
Individually impaired loans with related allowance recorded: total interest income recognized 1,090 1,077 3,152 3,264  
Individually impaired loans with no related allowance recorded: total interest income recognized 279 226 779 616  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 71 111 248 372  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 16 56 76 157  
Single-family [Member] | Government [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 299 285 290 266  
Individually impaired loans with no related allowance recorded: average recorded investment 53 55 55 70  
Individually impaired loans with related allowance recorded: total interest income recognized 3 3 9 9  
Individually impaired loans with no related allowance recorded: total interest income recognized 1 1 3 4  
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: interest income recognized on a cash basis 0 0 0 0  
Single-family [Member] | Alt-A          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 30,041 33,458 30,760 33,926  
Individually impaired loans with no related allowance recorded: average recorded investment 3,674 2,887 3,720 2,687  
Individually impaired loans with related allowance recorded: total interest income recognized 272 268 774 805  
Individually impaired loans with no related allowance recorded: total interest income recognized 64 51 158 135  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 14 24 41 74  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 1 14 8 34  
Single-family [Member] | Other [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 12,652 14,346 13,030 14,635  
Individually impaired loans with no related allowance recorded: average recorded investment 1,259 1,008 1,287 945  
Individually impaired loans with related allowance recorded: total interest income recognized 95 100 282 305  
Individually impaired loans with no related allowance recorded: total interest income recognized 21 16 56 40  
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 6 8 15 28  
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 0 3 2 8  
Multifamily [Member]          
Financing Receivable, Impaired [Line Items]          
Individually impaired loans with related allowance recorded: average recorded investment 878 1,540 1,053 1,813  
Individually impaired loans with no related allowance recorded: average recorded investment 386 1,572 463 1,698  
Individually impaired loans with related allowance recorded: total interest income recognized 9 17 15 63  
Individually impaired loans with no related allowance recorded: total interest income recognized 5 18 8 58  
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: interest income recognized on a cash basis 0 $ 0 0 $ 0  
Table Footnote [Abstract]          
Troubled debt restructuring recorded investment $ 490   $ 490   $ 716