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Mortgage Loans Loans in Mortgage Portfolio (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Loans in Mortgage Portfolio [Line Items]            
Unpaid principal balance of mortgage loans $ 2,971,942   $ 2,966,927      
Cost basis and fair value adjustments, net 14,675   3,850      
Allowance for loan losses for loans held for investment (63,375) [1] (70,109) (72,156) (69,506) [1] (67,557) (61,556)
Total mortgage loans 2,923,242   2,898,621      
Single-Family [Member]
           
Loans in Mortgage Portfolio [Line Items]            
Unpaid principal balance of mortgage loans 2,791,133   2,790,029      
Multifamily [Member]
           
Loans in Mortgage Portfolio [Line Items]            
Unpaid principal balance of mortgage loans 180,809   176,898      
Fannie Mae [Member]
           
Loans in Mortgage Portfolio [Line Items]            
Unpaid principal balance of mortgage loans 385,553   396,522      
Cost basis and fair value adjustments, net (15,510)   (16,143)      
Allowance for loan losses for loans held for investment (52,082) (57,001) (57,309) (55,966) (53,708) (48,530)
Total mortgage loans 317,961   323,070      
Fannie Mae [Member] | Single-Family [Member]
           
Loans in Mortgage Portfolio [Line Items]            
Unpaid principal balance of mortgage loans 316,090   319,496      
Fannie Mae [Member] | Multifamily [Member]
           
Loans in Mortgage Portfolio [Line Items]            
Unpaid principal balance of mortgage loans 69,463   77,026      
Consolidated Trusts [Member]
           
Loans in Mortgage Portfolio [Line Items]            
Unpaid principal balance of mortgage loans 2,586,389   2,570,405      
Cost basis and fair value adjustments, net 30,185   19,993      
Allowance for loan losses for loans held for investment (11,293) (13,108) (14,847) (13,540) (13,849) (13,026)
Total mortgage loans 2,605,281   2,575,551      
Consolidated Trusts [Member] | Single-Family [Member]
           
Loans in Mortgage Portfolio [Line Items]            
Unpaid principal balance of mortgage loans 2,475,043   2,470,533      
Consolidated Trusts [Member] | Multifamily [Member]
           
Loans in Mortgage Portfolio [Line Items]            
Unpaid principal balance of mortgage loans $ 111,346   $ 99,872      
[1] Total allowance for loan losses includes $293 million and $414 million as of June 30, 2012 and 2011, respectively, for acquired credit-impaired loans.