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Consolidations and Transfers of Financial Assets Managed Loans (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]    
Loans held for sale, unpaid principal balance $ 540 $ 459
Securitized loans, unpaid principal balance 2,177 2,272
Total loans managed, unpaid principal balance 2,995,089 2,980,965
Fannie Mae [Member]
   
Mortgage Loans on Real Estate [Line Items]    
Loans held for investment, unpaid principal balance 342,853 370,354
Consolidated Trusts [Member]
   
Mortgage Loans on Real Estate [Line Items]    
Loans held for investment, unpaid principal balance 2,649,519 2,607,880
Principal Amount of Delinquent Loans [Member]
   
Mortgage Loans on Real Estate [Line Items]    
Loans held for sale, unpaid principal balance 140 [1] 135 [1]
Securitized loans, unpaid principal balance 1 [1] 4 [1]
Total loans managed, unpaid principal balance 99,244 [1] 120,472 [1]
Principal Amount of Delinquent Loans [Member] | Fannie Mae [Member]
   
Mortgage Loans on Real Estate [Line Items]    
Loans held for investment, unpaid principal balance 86,459 [1] 102,504 [1]
Principal Amount of Delinquent Loans [Member] | Consolidated Trusts [Member]
   
Mortgage Loans on Real Estate [Line Items]    
Loans held for investment, unpaid principal balance $ 12,644 [1] $ 17,829 [1]
Minimum [Member]
   
Mortgage Loans on Real Estate [Line Items]    
Serious delinquency and accruing, days past due 90 days 90 days
[1] Represents the unpaid principal balance of loans held for investment (“HFI”), loans held for sale (“HFS”) and securitized loans for which we are no longer accruing interest and loans 90 days or more delinquent which are continuing to accrue interest.