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Preferred Stock (Details) (USD $)
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Mar. 31, 2013
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Dec. 31, 2012
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| Detail of Preferred Stock [Abstract] |
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| Preferred Stock Shares Authorized And Designated |
10,131,010 |
10,104,610 |
| Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |
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| Shares issued and outstanding |
11,487,986 |
10,558,865 |
| Par value |
$ 15,811,000,000 |
$ 14,282,000,000 |
| Carrying value |
14,412,000,000 |
12,883,000,000 |
| Discount |
1,399,000,000 |
1,399,000,000 |
| ESOP Shares issued and outstanding |
1,815,055 |
910,934 |
| ESOP Par value |
1,815,000,000 |
911,000,000 |
| ESOP Carrying value |
1,815,000,000 |
911,000,000 |
| ESOP Discount |
0 |
0 |
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Series G - 7.25% Class A Preferred Stock [Member]
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| Detail of Preferred Stock [Abstract] |
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| Preferred Stock, Liquidation Preference Per Share |
$ 15,000 |
$ 15,000 |
| Preferred Stock Shares Authorized And Designated |
50,000 |
50,000 |
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Series H - Floating Class A Preferred Stock [Member]
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| Detail of Preferred Stock [Abstract] |
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| Preferred Stock, Liquidation Preference Per Share |
$ 20,000 |
$ 20,000 |
| Preferred Stock Shares Authorized And Designated |
50,000 |
50,000 |
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Series I - Floating Class A Preferred Stock [Member]
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| Detail of Preferred Stock [Abstract] |
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| Preferred Stock, Liquidation Preference Per Share |
$ 100,000 |
$ 100,000 |
| Preferred Stock Shares Authorized And Designated |
25,010 |
25,010 |
| Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |
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| Shares issued and outstanding |
25,010 |
25,010 |
| Par value |
2,501,000,000 |
2,501,000,000 |
| Carrying value |
2,501,000,000 |
2,501,000,000 |
| Discount |
0 |
0 |
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Series J - 8.00% Non-Cumulative Perpetual Class A Preferred Stock [Member]
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| Detail of Preferred Stock [Abstract] |
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| Preferred Stock, Liquidation Preference Per Share |
$ 1,000 |
$ 1,000 |
| Preferred Stock Shares Authorized And Designated |
2,300,000 |
2,300,000 |
| Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |
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| Shares issued and outstanding |
2,150,375 |
2,150,375 |
| Par value |
2,150,000,000 |
2,150,000,000 |
| Carrying value |
1,995,000,000 |
1,995,000,000 |
| Discount |
155,000,000 |
155,000,000 |
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Series K - 7.98% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock [Member]
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| Detail of Preferred Stock [Abstract] |
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| Preferred Stock, Liquidation Preference Per Share |
$ 1,000 |
$ 1,000 |
| Preferred Stock Shares Authorized And Designated |
3,500,000 |
3,500,000 |
| Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |
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| Shares issued and outstanding |
3,352,000 |
3,352,000 |
| Par value |
3,352,000,000 |
3,352,000,000 |
| Carrying value |
2,876,000,000 |
2,876,000,000 |
| Discount |
476,000,000 |
476,000,000 |
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Series L - 7.50% Non-Cumulative Perpetual Convertible Class A Preferred Stock [Member]
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| Detail of Preferred Stock [Abstract] |
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| Preferred Stock, Liquidation Preference Per Share |
$ 1,000 |
$ 1,000 |
| Preferred Stock Shares Authorized And Designated |
4,025,000 |
4,025,000 |
| Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |
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| Shares issued and outstanding |
3,968,000 |
3,968,000 |
| Par value |
3,968,000,000 |
3,968,000,000 |
| Carrying value |
3,200,000,000 |
3,200,000,000 |
| Discount |
768,000,000 |
768,000,000 |
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Series N - 5.20% Non-Cumulative Perpetual Class A Preferred Stock [Member]
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| Detail of Preferred Stock [Abstract] |
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| Preferred Stock, Liquidation Preference Per Share |
$ 25,000 |
$ 25,000 |
| Preferred Stock Shares Authorized And Designated |
30,000 |
30,000 |
| Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |
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| Shares issued and outstanding |
30,000 |
30,000 |
| Par value |
750,000,000 |
750,000,000 |
| Carrying value |
750,000,000 |
750,000,000 |
| Discount |
0 |
0 |
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Series O - 5.125% Non-Cumulative Perpetual Class A Preferred Stock [Member]
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| Detail of Preferred Stock [Abstract] |
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| Preferred Stock, Liquidation Preference Per Share |
$ 25,000 |
$ 25,000 |
| Preferred Stock Shares Authorized And Designated |
27,600 |
27,600 |
| Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |
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| Shares issued and outstanding |
26,000 |
26,000 |
| Par value |
650,000,000 |
650,000,000 |
| Carrying value |
650,000,000 |
650,000,000 |
| Discount |
0 |
0 |
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Series P - 5.25% Non-Cumulative Perpetual Class A Preferred Stock [Member]
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| Detail of Preferred Stock [Abstract] |
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| Preferred Stock, Liquidation Preference Per Share |
$ 25,000 |
$ 0 |
| Preferred Stock Shares Authorized And Designated |
26,400 |
0 |
| Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |
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| Shares issued and outstanding |
25,000 |
0 |
| Par value |
625,000,000 |
0 |
| Carrying value |
625,000,000 |
0 |
| Discount |
0 |
0 |
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Dividend Equalization Preferred [Member]
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| Detail of Preferred Stock [Abstract] |
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| Preferred Stock, Liquidation Preference Per Share |
$ 10 |
$ 10 |
| Preferred Stock Shares Authorized And Designated |
97,000 |
97,000 |
| Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |
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| Shares issued and outstanding |
96,546 |
96,546 |
| Par value |
0 |
0 |
| Carrying value |
0 |
0 |
| Discount |
$ 0 |
$ 0 |