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Investments in Securities Trading 1 (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 50,935 $ 74,198
Mortgage-related securities [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 23,334 24,350
Fannie Mae [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 6,819 7,424
Freddie Mac [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 2,974 2,732
Ginnie Mae [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 282 287
Alt-A private-label securities [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 1,296 1,349
Subprime private-label securities [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 1,226 1,280
CMBS [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 9,930 10,411
Mortgage revenue bonds [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 689 724
Other mortgage-related securities [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 118 143
Non-mortgage-related Securities [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 27,601 49,848
U.S. Treasury Securities [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 27,064 47,737
Asset-backed securities [Member]
   
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 537 $ 2,111