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Investments in Securities Trading 1 (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 31,795 $ 30,768
Mortgage-related securities [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 14,208 14,462
Freddie Mac [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 1,657 1,839
Ginnie Mae [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 248 407
Alt-A private-label securities [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 1,488 1,516
Subprime private-label securities [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 1,453 1,448
CMBS [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 2,676 2,718
Mortgage revenue bonds [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 601 565
Other mortgage-related securities [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 102 99
U.S. Treasury securities [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 17,587 16,306
Fannie Mae [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 5,983 $ 5,870