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Investments in Securities Trading 1 (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 41,867 $ 34,679
Mortgage-related securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 6,276 5,457
Fannie Mae [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 1,467 3,876
Other agency [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 3,503 1,118
Alt-A and subprime private-label securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 1,306 463
U.S. Treasury Securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 35,502 29,222
Debt Security, Corporate, US [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 89 0
Non-mortgage-related securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 35,591 $ 29,222