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
Mar. 31, 2014
Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 344,735 $ 330,440
Fair Value 338,682 321,225
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 123,366 123,813
Fair Value 119,649 118,708
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 114,050 118,700
Fair Value 111,994 115,314
US Treasury Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 31,291 10,533
Fair Value 31,264 10,428
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 24,468 24,908
Fair Value $ 23,959 $ 24,075