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Investments in Securities Trading 1 (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 40,000 $ 39,908
Mortgage-related securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 9,254 10,423
Fannie Mae [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 5,426 4,813
Freddie Mac [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 867 1,314
Ginnie Mae [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 434 426
Alt-A private-label securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 307 436
Subprime private-label securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 406 644
CMBS [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 1,451 2,341
Mortgage revenue bonds [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 363 449
U.S. Treasury securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 30,746 $ 29,485