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Shareholders' Equity (Details) (USD $)
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3 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | |||||||||
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Jun. 30, 2013
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Mar. 31, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
Employee Stock Option [Member]
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Mar. 14, 2013
Common Stock [Member]
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Jun. 30, 2013
Common Stock [Member]
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Sep. 30, 2013
Dividend Declared [Member]
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Jun. 30, 2013
Dividend Declared [Member]
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Mar. 31, 2013
Dividend Declared [Member]
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Jun. 30, 2013
Retained Earnings [Member]
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Jun. 30, 2012
Retained Earnings [Member]
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Jun. 30, 2013
Retained Earnings [Member]
8.20% Non-Cumulative Preferred Stock, Series H [Member]
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Jun. 30, 2013
Retained Earnings [Member]
8.20% Non-Cumulative Preferred Stock, Series H [Member]
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Jun. 30, 2013
Preferred Stock [Member]
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Jun. 30, 2013
Preferred Stock [Member]
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Jun. 30, 2012
Preferred Stock [Member]
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Aug. 02, 2013
Preferred Stock [Member]
Subsequent Event [Member]
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| Class of Stock [Line Items] | |||||||||||||||||||
| Cash dividends declared per common share | $ 0.01 | $ 0.01 | $ 0.01 | ||||||||||||||||
| Stock repurchase program, authorized amount | $ 5,000,000,000.0 | ||||||||||||||||||
| Redempmtion of stock (shares) | 79,600,000 | ||||||||||||||||||
| Redempmtion of stock | 5,611,000,000 | 1,000,000,000 | (5,500,000,000) | 76,000,000 | 5,535,000,000 | 951,000,000 | |||||||||||||
| Stock issued (shares) | 72,000,000 | ||||||||||||||||||
| Shares paid for tax withholding for share based compensation | 28,000,000 | ||||||||||||||||||
| Share-based compensation, number of shares authorized | 1,800,000,000 | 1,800,000,000 | |||||||||||||||||
| Preferred stock dividends | 441,000,000 | 373,000,000 | 365,000,000 | 814,000,000 | 690,000,000 | ||||||||||||||
| Preferred stock dividends | 365,000,000 | 738,000,000 | 734,000,000 | 738,000,000 | 734,000,000 | ||||||||||||||
| Issuance of preferred stock | $ 1,008,000,000 | $ 659,000,000 | $ (2,000,000) | $ 1,008,000,000 | $ 661,000,000 | ||||||||||||||
| Preferred Stock, Dividend Rate, Percentage | 7.25% | ||||||||||||||||||