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Investments in Securities Trading 1 (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 52,391 $ 40,695
Mortgage-related securities [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 23,985 22,745
Fannie Mae [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 6,432 6,248
Freddie Mac [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 3,375 2,793
Ginnie Mae [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 679 437
Alt-A private-label securities [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 1,457 1,330
Subprime private-label securities [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 1,446 1,319
CMBS [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 9,817 9,826
Mortgage revenue bonds [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 661 675
Other mortgage-related securities [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 118 117
U.S. Treasury Securities [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 28,406 $ 17,950