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Mortgage Loans Loans in Mortgage Portfolio (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Loans in Mortgage Portfolio [Line Items]                
Unpaid principal balance of mortgage loans $ 3,013,485,000,000   $ 3,013,485,000,000     $ 3,039,559,000,000    
Cost basis and fair value adjustments, net 33,649,000,000   33,649,000,000     30,527,000,000    
Allowance for loan losses for loans held for investment (36,931,000,000) (45,169,000,000) (36,931,000,000) (45,169,000,000) (39,067,000,000) (43,846,000,000) (49,643,000,000) (58,795,000,000)
Total mortgage loans 3,010,203,000,000   3,010,203,000,000     3,026,240,000,000    
Financing Receivable, Reclassification to Held-for-investment 240,000,000   241,000,000          
Carrying value of loans redesignated from HFI to HFS   1,300,000,000 2,200,000,000 1,300,000,000        
Sale of loans, unpaid principal balance   731,000,000 1,900,000,000 731,000,000        
Single-Family [Member]
               
Loans in Mortgage Portfolio [Line Items]                
Unpaid principal balance of mortgage loans 2,829,218,000,000   2,829,218,000,000     2,855,668,000,000    
Multifamily [Member]
               
Loans in Mortgage Portfolio [Line Items]                
Unpaid principal balance of mortgage loans 184,267,000,000   184,267,000,000     183,891,000,000    
Fannie Mae [Member]
               
Loans in Mortgage Portfolio [Line Items]                
Unpaid principal balance of mortgage loans 292,263,000,000   292,263,000,000     314,286,000,000    
Cost basis and fair value adjustments, net (12,958,000,000)   (12,958,000,000)     (13,778,000,000)    
Allowance for loan losses for loans held for investment (34,562,000,000) (41,345,000,000) (34,562,000,000) (41,345,000,000) (36,643,000,000) (40,521,000,000) (44,825,000,000) (50,519,000,000)
Total mortgage loans 244,743,000,000   244,743,000,000     259,987,000,000    
Fannie Mae [Member] | Single-Family [Member]
               
Loans in Mortgage Portfolio [Line Items]                
Unpaid principal balance of mortgage loans 265,450,000,000   265,450,000,000     276,644,000,000    
Fannie Mae [Member] | Multifamily [Member]
               
Loans in Mortgage Portfolio [Line Items]                
Unpaid principal balance of mortgage loans 26,813,000,000   26,813,000,000     37,642,000,000    
Consolidated Trusts [Member]
               
Loans in Mortgage Portfolio [Line Items]                
Unpaid principal balance of mortgage loans 2,721,222,000,000   2,721,222,000,000     2,725,273,000,000    
Cost basis and fair value adjustments, net 46,607,000,000   46,607,000,000     44,305,000,000    
Allowance for loan losses for loans held for investment (2,369,000,000) (3,824,000,000) (2,369,000,000) (3,824,000,000) (2,424,000,000) (3,325,000,000) (4,818,000,000) (8,276,000,000)
Total mortgage loans 2,765,460,000,000   2,765,460,000,000     2,766,253,000,000    
Consolidated Trusts [Member] | Single-Family [Member]
               
Loans in Mortgage Portfolio [Line Items]                
Unpaid principal balance of mortgage loans 2,563,768,000,000   2,563,768,000,000     2,579,024,000,000    
Consolidated Trusts [Member] | Multifamily [Member]
               
Loans in Mortgage Portfolio [Line Items]                
Unpaid principal balance of mortgage loans $ 157,454,000,000   $ 157,454,000,000     $ 146,249,000,000