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, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Marketable Securities [Line Items]    
Amortized Cost $ 369,668 $ 330,440
Fair Value 366,939 321,225
Fannie Mae
   
Marketable Securities [Line Items]    
Amortized Cost 127,610 123,813
Fair Value 126,061 118,708
Government National Mortgage Association
   
Marketable Securities [Line Items]    
Amortized Cost 101,052 118,700
Fair Value 99,757 115,314
U.S. Treasury
   
Marketable Securities [Line Items]    
Amortized Cost 58,263 10,533
Fair Value 58,208 10,428
Freddie Mac
   
Marketable Securities [Line Items]    
Amortized Cost 25,717 24,908
Fair Value $ 25,553 $ 24,075