Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Details)

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Shareholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended
Apr. 11, 2012
Jan. 11, 2012
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Stock Options [Member]
Jun. 30, 2012
Exchange Agreements [Member]
Non-Convertible Preferred Stock and Trust Preferred Securities [Member]
Jun. 30, 2012
Exchange Agreements [Member]
Common Stock [Member]
Jun. 30, 2012
Exchange Agreement Non-Convertible Preferred Stock for Common Stock [Member]
Non-Convertible Preferred Stock [Member]
Jun. 30, 2012
Exchange Agreement Trust Preferred Securities for Common Stock [Member]
Trust Preferred Securities [Member]
Jul. 11, 2012
Dividend Declared [Member]
Jun. 30, 2012
Retained Earnings [Member]
Mar. 31, 2012
Retained Earnings [Member]
Jun. 30, 2012
Retained Earnings [Member]
Jun. 30, 2011
Retained Earnings [Member]
Class of Stock [Line Items]                                
Cash dividends declared per common share $ 0.01 $ 0.01                   $ 0.01        
Preferred Stock, Including Additional Paid in Capital                   $ 296            
Trust Preferred Securities, Carrying Amount                     760          
Stock Issued During Period, Shares, New Issues                 50,000,000              
Stock Issued During Period, Value, New Issues                 412              
Payments Included in Exchange of Preferred Stock and Trust Preferred Securities for Common Stock                 398              
Increase In Retained Earnings And Net Income Applicable To Common Shareholders               246                
Non Cash Reduction to Preferred Stock Dividends               44                
Noninterest Income, Other Operating Income     603 1,957 (531) 2,218   202                
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures             294,000,000                  
Shares Paid for Tax Withholding for Share Based Compensation         103,000,000                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     1,900,000,000   1,900,000,000                      
Dividends, Preferred Stock, Cash         $ 734 $ 611             $ 365 $ 369 $ 734 $ 611