XML 92 R58.htm IDEA: XBRL DOCUMENT v3.10.0.1
Investments in Securities Trading 1 (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 42,381 $ 34,679
Mortgage-related securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 6,621 5,457
Fannie Mae [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 1,696 3,876
Other agency [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 3,494 1,118
Alt-A and subprime private-label securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 1,430 453
CMBS [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 0 9
Mortgage revenue bonds [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 1 1
Non-mortgage-related securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 35,760 29,222
U.S. Treasury securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 35,663 29,222
Other securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 97 $ 0