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
Sep. 30, 2012
Dec. 31, 2011
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity debt securities, Amortized Cost $ 39,898 $ 35,265
Held-to-maturity Securities, Fair Value 41,128 35,442
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity debt securities, Amortized Cost 131,755 87,898
Held-to-maturity Securities, Fair Value 135,416 89,243
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity debt securities, Amortized Cost 118,851 102,960
Held-to-maturity Securities, Fair Value 122,753 106,200
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity debt securities, Amortized Cost 24,936 26,617
Held-to-maturity Securities, Fair Value 25,724 27,129
United States Treasury Securities Exceeding Ten Percent Of Consolidated Shareholders Equity [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity debt securities, Amortized Cost 24,387 39,946
Held-to-maturity Securities, Fair Value $ 24,388 $ 39,164