Quarterly report pursuant to Section 13 or 15(d)

Securities - U.S. GSE, Agency, and Treasury Securities (Details)

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Securities - U.S. GSE, Agency, and Treasury Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Fannie Mae    
Marketable Securities [Line Items]    
Amortized Cost $ 144,527 $ 130,725
Fair Value 145,423 131,418
Government National Mortgage Association    
Marketable Securities [Line Items]    
Amortized Cost 102,427 98,278
Fair Value 102,622 98,633
U.S. Treasury    
Marketable Securities [Line Items]    
Amortized Cost 52,093 28,288
Fair Value 52,485 28,556
Freddie Mac    
Marketable Securities [Line Items]    
Amortized Cost 37,424 68,481
Fair Value $ 38,061 $ 68,801