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
Jun. 30, 2013
Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities Amortized Cost $ 338,805 $ 353,268
Debt Securities, Fair Value 334,337 361,120
Held-to-maturity debt securities, Amortized Cost 54,922 [1] 49,481
Held-to-maturity Securities, Fair Value 52,856 [1] 50,270
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities Amortized Cost 138,517 121,522
Debt Securities, Fair Value 135,163 123,933
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities Amortized Cost 118,459 124,348
Debt Securities, Fair Value 119,414 127,541
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities Amortized Cost 30,905 22,995
Debt Securities, Fair Value $ 30,347 $ 23,502
[1] Substantially all U.S. agency MBS.