Annual report pursuant to Section 13 and 15(d)

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

v2.4.0.8
Securities - U.S. GSE, Agency, and Treasury Securities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 330,440 $ 353,268
Fair Value 321,225 361,120
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 123,813 121,522
Fair Value 118,708 123,933
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 118,700 124,348
Fair Value 115,314 127,541
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 24,908 22,995
Fair Value $ 24,075 $ 23,502