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Loans in Mortgage Portfolio (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans $ 3,010,753 $ 3,019,300    
Cost basis and fair value adjustments, net 36,842 35,735    
Allowance for loan losses for loans held for investment (27,951) (35,541) $ (43,846) $ (58,795)
Total mortgage loans 3,019,644 3,019,494    
Carrying value of loans redesignated from HFI to HFS 8,600 2,200 1,300  
Carrying value of loans redesignated from HFS to HFI   285    
Sale of loans, unpaid principal balance 3,600 1,900 1,200  
Single-Family [Member]        
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans 2,812,411 2,832,000    
Recorded investment of single-family mortgage loans referred to foreclosure 25,600      
Multifamily [Member]        
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans 198,342 187,300    
Fannie Mae [Member]        
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans 251,336 285,371    
Cost basis and fair value adjustments, net (12,939) (12,705)    
Allowance for loan losses for loans held for investment (26,510) (33,117) (40,521) (50,519)
Total mortgage loans 211,887 239,549    
Fannie Mae [Member] | Single-Family [Member]        
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans 238,237 262,116    
Fannie Mae [Member] | Multifamily [Member]        
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans 13,099 23,255    
Consolidated Trusts [Member]        
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans 2,759,417 2,733,929    
Cost basis and fair value adjustments, net 49,781 48,440    
Allowance for loan losses for loans held for investment (1,441) (2,424) $ (3,325) $ (8,276)
Total mortgage loans 2,807,757 2,779,945    
Consolidated Trusts [Member] | Single-Family [Member]        
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans 2,574,174 2,569,884    
Consolidated Trusts [Member] | Multifamily [Member]        
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans $ 185,243 $ 164,045