Annual report pursuant to Section 13 and 15(d)

Securities Securities - U.S. GSE, Agency, and Treasury Securities (Details)

v2.4.0.6
Securities Securities - U.S. GSE, Agency, and Treasury Securities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity debt securities, Amortized Cost $ 35,265 $ 427
Held-to-maturity Securities, Fair Value 35,442 427
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity debt securities, Amortized Cost 87,898 123,662
Held-to-maturity Securities, Fair Value 89,243 123,107
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity debt securities, Amortized Cost 102,960 72,863
Held-to-maturity Securities, Fair Value 106,200 74,305
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 26,617 30,523
Held-to-maturity Securities, Fair Value 27,129 30,822
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 39,946 46,576
Held-to-maturity Securities, Fair Value $ 39,164 $ 46,081