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
Jun. 30, 2015
Dec. 31, 2014
Marketable Securities [Line Items]    
Amortized Cost $ 392,512 $ 378,398
Fair Value 391,470 380,336
Fannie Mae    
Marketable Securities [Line Items]    
Amortized Cost 145,370 130,725
Fair Value 144,395 131,418
Government National Mortgage Association    
Marketable Securities [Line Items]    
Amortized Cost 90,844 98,278
Fair Value 90,049 98,633
U.S. Treasury    
Marketable Securities [Line Items]    
Amortized Cost 55,590 68,481
Fair Value 56,174 68,801
Freddie Mac    
Marketable Securities [Line Items]    
Amortized Cost 46,282 28,288
Fair Value $ 46,059 $ 28,556