Quarterly report pursuant to Section 13 or 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
Sep. 30, 2013
Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities Amortized Cost $ 323,298 $ 353,268
Debt Securities, Fair Value 319,200 361,120
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities Amortized Cost 134,317 121,522
Debt Securities, Fair Value 131,689 123,933
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities Amortized Cost 114,509 124,348
Debt Securities, Fair Value 113,138 127,541
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities Amortized Cost 26,096 22,995
Debt Securities, Fair Value $ 25,724 $ 23,502