v2.4.0.6
Preferred Stock Textuals (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Preferred Stock (Textual) [Abstract]    
Par value $ 14,282,000,000 $ 12,830,000,000
Shares issued and outstanding 10,558,865 10,450,690
Voting Rights If issued, preference shares would be limited to one vote per share  
Additional paid-in capital included related to preferred stock 75,000,000 67,000,000
Preferred Stock, No Voting Rights [Member]
   
Preferred Stock (Textual) [Abstract]    
Preferred Stock, Shares Authorized 20,000,000  
Par value 0  
Preferred Stock, Voting Rights [Member]
   
Preferred Stock (Textual) [Abstract]    
Preferred Stock, Shares Authorized 4,000,000  
Par value 0  
Shares issued and outstanding 0  
Employee Stock Ownership Plan Preferred Stock [Member]
   
Preferred Stock (Textual) [Abstract]    
Redemption terms We have the option to redeem the ESOP Preferred Stock at any time, in whole or in part, at a redemption price per share equal to the higher of (a) $1,000 per share plus accrued and unpaid dividends or (b) the fair market value  
Series N - 5.20% Non-Cumulative Perpetual Class A Preferred Stock [Member]
   
Preferred Stock (Textual) [Abstract]    
Par value 750,000,000 0
Shares issued and outstanding 30,000 0
Depositary shares issued and outstanding 30,000,000  
Percentage Interest in a share of issued preferred stock 0.10%  
Series O - 5.125% Non-Cumulative Perpetual Class A Preferred Stock [Member]
   
Preferred Stock (Textual) [Abstract]    
Par value 650,000,000 0
Shares issued and outstanding 26,000 0
Depositary shares issued and outstanding 26,000,000  
Percentage Interest in a share of issued preferred stock 0.10%  
Series G - 7.25% Class A Preferred Stock [Member]
   
Preferred Stock (Textual) [Abstract]    
Preferred stock, commitment to issue 0  
Series H - Floating Class A Preferred Stock [Member]
   
Preferred Stock (Textual) [Abstract]    
Preferred stock, commitment to issue $ 0