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Shareholders' Equity (Details) (USD $)
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3 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
Employee Stock Option [Member]
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Mar. 14, 2013
Common Stock [Member]
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Sep. 30, 2013
Common Stock [Member]
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Sep. 30, 2013
Common Stock [Member]
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Sep. 30, 2013
8.20% Non-Cumulative Preferred Stock, Series H [Member]
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Dec. 31, 2013
Dividend Declared [Member]
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Sep. 30, 2013
Retained Earnings [Member]
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Sep. 30, 2012
Retained Earnings [Member]
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Sep. 30, 2013
Preferred Stock [Member]
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Sep. 30, 2012
Preferred Stock [Member]
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Sep. 30, 2013
Preferred Stock [Member]
8.20% Non-Cumulative Preferred Stock, Series H [Member]
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Sep. 30, 2013
Preferred Stock [Member]
Fixed-to-Floating Rate Semi-annual Non-Cumulative Preferred Stock, Series U [Member]
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| Class of Stock [Line Items] | |||||||||||||||||
| Cash dividends declared per common share (dollars per share) | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 | |||||||||||||
| Stock repurchase program, authorized amount | $ 5,000,000,000.0 | ||||||||||||||||
| Redempmtion of stock (shares) | 60,000,000 | 139,600,000 | |||||||||||||||
| Redempmtion of stock | 6,561,000,000 | 866,000,000 | 1,900,000,000 | (6,600,000,000) | 100,000,000 | 6,461,000,000 | 6,500,000,000 | ||||||||||
| Stock issued (shares) | 73,000,000 | ||||||||||||||||
| Shares paid for tax withholding for share based compensation (shares) | 28,000,000 | ||||||||||||||||
| Share-based compensation, number of shares authorized (shares) | 1,800,000,000 | 1,800,000,000 | |||||||||||||||
| Preferred stock dividends | (255,000,000) | (365,000,000) | (373,000,000) | (993,000,000) | (1,107,000,000) | (993,000,000) | (1,107,000,000) | ||||||||||
| Issuance of preferred stock | $ 1,008,000,000 | $ 667,000,000 | $ 1,008,000,000 | $ 667,000,000 | $ 1,000,000,000 | ||||||||||||