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Concentrations of Credit Risk Financial Guarantor (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Concentration Risk [Line Items]    
Unpaid principal balance of guaranteed non-agency securities in our portfolio $ 5,554 $ 6,858
Alt-A private-label securities [Member]
   
Concentration Risk [Line Items]    
Unpaid principal balance of guaranteed non-agency securities in our portfolio 511 928
Subprime private-label securities [Member]
   
Concentration Risk [Line Items]    
Unpaid principal balance of guaranteed non-agency securities in our portfolio 868 1,264
Mortgage revenue bonds [Member]
   
Concentration Risk [Line Items]    
Unpaid principal balance of guaranteed non-agency securities in our portfolio 3,911 4,374
Other mortgage-related securities [Member]
   
Concentration Risk [Line Items]    
Unpaid principal balance of guaranteed non-agency securities in our portfolio $ 264 $ 292