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Investments in Securities Trading 1 (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 34,679 $ 40,562
Mortgage-related securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 5,457 8,245
Fannie Mae [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 3,876 4,769
Other agency [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 1,118 2,058
Alt-A and subprime private-label securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 453 636
Commerical mortgage-backed securities (CMBS) [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 9 761
Mortgage revenue bonds [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 1 21
U.S. Treasury Securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 29,222 $ 32,317