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Investments in Securities Trading 1 (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 40,562 $ 39,908
Mortgage-related securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 8,245 10,423
Fannie Mae [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 4,769 4,813
Freddie Mac [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 936 1,314
Ginnie Mae [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 1,122 426
Alt-A private-label securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 317 436
Subprime private-label securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 319 644
Commerical mortgage-backed securities (CMBS) [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 761 2,341
Mortgage revenue bonds [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 21 449
U.S. Treasury Securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 32,317 $ 29,485