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Preferred Stock Textuals (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | ||||||||
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Jun. 30, 2013
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Dec. 31, 2012
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Jun. 30, 2013
Preferred Stock, No Voting Rights [Member]
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Jun. 30, 2013
Preferred Stock, Voting Rights [Member]
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Jun. 30, 2013
Preferred Stock, Voting Rights [Member]
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Jun. 30, 2013
Employee Stock Ownership Plan Preferred Stock [Member]
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Mar. 31, 2013
Series P - 5.25% Non-Cumulative Perpetual Class A Preferred Stock [Member]
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Jun. 30, 2013
Series P - 5.25% Non-Cumulative Perpetual Class A Preferred Stock [Member]
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Dec. 31, 2012
Series P - 5.25% Non-Cumulative Perpetual Class A Preferred Stock [Member]
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Jun. 30, 2013
Series G - 7.25% Class A Preferred Stock [Member]
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Jun. 30, 2013
Series H - Floating Class A Preferred Stock [Member]
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| Preferred Stock (Textual) [Abstract] | |||||||||||
| Preferred Stock, Shares Authorized | 20,000,000 | 4,000,000 | 4,000,000 | ||||||||
| Par value | $ 15,387,000,000 | $ 14,282,000,000 | $ 0 | $ 0 | $ 0 | $ 625,000,000 | $ 0 | ||||
| Shares issued and outstanding | 11,064,275 | 10,558,865 | 0 | 0 | 25,000 | 0 | |||||
| Voting Rights | If issued, preference shares would be limited to one vote per share | ||||||||||
| Depositary shares issued and outstanding | 25,000,000 | ||||||||||
| Percentage Interest in a share of issued preferred stock | 0.10% | ||||||||||
| Preferred stock, commitment to issue | 0 | 0 | |||||||||
| Redemption terms | We have the option to redeem the ESOP Preferred Stock at any time, in whole or in part, at a redemption price per share equal to the higher of (a) $1,000 per share plus accrued and unpaid dividends or (b) the fair market value | ||||||||||
| Additional paid-in capital included related to preferred stock | $ 119,000,000 | $ 75,000,000 | |||||||||