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Investments in Securities Trading 1 (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 40,547 $ 39,908
Mortgage-related securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 9,270 10,423
Fannie Mae [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 4,931 4,813
Freddie Mac [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 808 1,314
Ginnie Mae [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 1,393 426
Alt-A private-label securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 313 436
Subprime private-label securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 353 644
CMBS [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 1,281 2,341
Mortgage revenue bonds [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 191 449
U.S. Treasury securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 31,277 $ 29,485