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
Jun. 30, 2014
Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 352,771 $ 330,440
Fair Value 352,042 321,225
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 121,088 123,813
Fair Value 120,142 118,708
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 108,968 118,700
Fair Value 108,633 115,314
US Treasury Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 40,236 10,533
Fair Value 40,520 10,428
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 23,411 24,908
Fair Value $ 23,374 $ 24,075