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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 | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
Stock Options [Member]
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Sep. 30, 2012
Exchange Agreements [Member]
Non-Convertible Preferred Stock and Trust Preferred Securities [Member]
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Sep. 30, 2012
Exchange Agreements [Member]
Common Stock [Member]
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Sep. 30, 2012
Exchange Agreement Non-Convertible Preferred Stock for Common Stock [Member]
Non-Convertible Preferred Stock [Member]
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Sep. 30, 2012
Exchange Agreement Trust Preferred Securities for Common Stock [Member]
Trust Preferred Securities [Member]
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Oct. 24, 2012
Dividend Declared [Member]
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Jul. 11, 2012
Dividend Declared [Member]
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Apr. 11, 2012
Dividend Declared [Member]
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Jan. 11, 2012
Dividend Declared [Member]
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Sep. 30, 2012
Retained Earnings [Member]
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Jun. 30, 2012
Retained Earnings [Member]
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Mar. 31, 2012
Retained Earnings [Member]
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Sep. 30, 2012
Retained Earnings [Member]
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Sep. 30, 2011
Retained Earnings [Member]
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| 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 | |||||||||||