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Mortgage Loans Loans in Mortgage Portfolio (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans $ 3,028,727 $ 3,039,559    
Cost basis and fair value adjustments, net 31,200 30,527    
Allowance for loan losses for loans held for investment (41,911) (43,846) (56,461) (58,795)
Total mortgage loans 3,018,016 3,026,240    
Single-Family [Member]
       
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans 2,846,225 2,855,668    
Multifamily [Member]
       
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans 182,502 183,891    
Fannie Mae [Member]
       
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans 305,627 314,286    
Cost basis and fair value adjustments, net (13,431) (13,778)    
Allowance for loan losses for loans held for investment (39,004) (40,521) (49,553) (50,519)
Total mortgage loans 253,192 259,987    
Fannie Mae [Member] | Single-Family [Member]
       
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans 271,947 276,644    
Fannie Mae [Member] | Multifamily [Member]
       
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans 33,680 37,642    
Consolidated Trusts [Member]
       
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans 2,723,100 2,725,273    
Cost basis and fair value adjustments, net 44,631 44,305    
Allowance for loan losses for loans held for investment (2,907) (3,325) (6,908) (8,276)
Total mortgage loans 2,764,824 2,766,253    
Consolidated Trusts [Member] | Single-Family [Member]
       
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans 2,574,278 2,579,024    
Consolidated Trusts [Member] | Multifamily [Member]
       
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans $ 148,822 $ 146,249