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
3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Stock Options [Member]
Sep. 30, 2012
Exchange Agreements [Member]
Non-Convertible Preferred Stock and Trust Preferred Securities [Member]
Sep. 30, 2012
Exchange Agreements [Member]
Common Stock [Member]
Sep. 30, 2012
Exchange Agreement Non-Convertible Preferred Stock for Common Stock [Member]
Non-Convertible Preferred Stock [Member]
Sep. 30, 2012
Exchange Agreement Trust Preferred Securities for Common Stock [Member]
Trust Preferred Securities [Member]
Oct. 24, 2012
Dividend Declared [Member]
Jul. 11, 2012
Dividend Declared [Member]
Apr. 11, 2012
Dividend Declared [Member]
Jan. 11, 2012
Dividend Declared [Member]
Sep. 30, 2012
Retained Earnings [Member]
Jun. 30, 2012
Retained Earnings [Member]
Mar. 31, 2012
Retained Earnings [Member]
Sep. 30, 2012
Retained Earnings [Member]
Sep. 30, 2011
Retained Earnings [Member]
Class of Stock [Line Items]                                    
Cash dividends declared per common share                   $ 0.01 $ 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 (790) 4,511 (1,321) 6,729   202                        
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures         295,000,000                          
Shares Paid for Tax Withholding for Share Based Compensation     104,000,000                              
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     $ (1,107) $ 954                   $ 373 $ 365 $ 369 $ 1,107 $ 954