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Shareholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified |
12 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2011
Series B Preferred Stock [Member]
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Dec. 31, 2011
Series D Preferred Stock [Member]
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Dec. 31, 2011
Series E Preferred Stock [Member]
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Dec. 31, 2011
Series H Preferred Stock [Member]
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Dec. 31, 2011
Series I Preferred Stock [Member]
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Dec. 31, 2011
Series J Preferred Stock [Member]
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Dec. 31, 2011
Series K Preferred Stock [Member]
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Dec. 31, 2011
Series L Preferred Stock [Member]
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Dec. 31, 2011
Series M Preferred Stock [Member]
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Dec. 31, 2011
Series T Preferred Stock [Member]
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Dec. 31, 2011
Series 1 Preferred Stock [Member]
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Dec. 31, 2011
Series 2 Preferred Stock [Member]
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Dec. 31, 2011
Series 3 Preferred Stock [Member]
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Dec. 31, 2011
Series 4 Preferred Stock [Member]
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Dec. 31, 2011
Series 5 Preferred Stock [Member]
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Dec. 31, 2011
Series 6 Preferred Stock [Member]
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Dec. 31, 2011
Series 7 Preferred Stock [Member]
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Dec. 31, 2011
Series 8 Preferred Stock [Member]
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Dec. 31, 2011
Option One [Member]
Series E Preferred Stock [Member]
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Dec. 31, 2011
Option Two [Member]
Series E Preferred Stock [Member]
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Dec. 31, 2011
Through January 29, 2018 [Member]
Series K Preferred Stock [Member]
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Dec. 31, 2011
Through May 14, 2018 [Member]
Series M Preferred Stock [Member]
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| Class of Stock [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Total Shares Outstanding | 3,689,084 | 3,943,660 | 7,571 | [1] | 26,174 | [2],[3] | 13,576 | [2],[3] | 114,483 | [2],[3] | 14,584 | [2],[3] | 38,053 | [2],[3] | 61,773 | [2],[4] | 3,080,182 | 52,399 | [2],[4] | 50,000 | 3,646 | [2],[5] | 12,111 | [2],[5] | 21,773 | [2],[5] | 10,773 | [2],[5] | 16,902 | [2],[5] | 59,388 | [2],[6] | 16,596 | [2],[6] | 89,100 | [2],[5] | ||||||||||||||||||||
| Liquidation Preference Per Share (in dollars) | $ 100 | [1] | $ 25,000 | [1] | $ 25,000 | [1] | $ 25,000 | [1] | $ 25,000 | [1] | $ 25,000 | [1] | $ 25,000 | [1] | $ 1,000 | [1] | $ 25,000 | [1] | $ 100,000 | [1] | $ 30,000 | [1] | $ 30,000 | [1] | $ 30,000 | [1] | $ 30,000 | [1] | $ 30,000 | [1] | $ 1,000 | [1] | $ 1,000 | [1] | $ 30,000 | [1] | ||||||||||||||||||||
| Carrying Value | $ 18,730 | $ 1 | [1],[7] | $ 654 | [2],[3],[7] | $ 340 | [2],[3],[7] | $ 2,862 | [2],[3],[7] | $ 365 | [2],[3],[7] | $ 951 | [2],[3],[7] | $ 1,544 | [2],[3],[7] | $ 3,080 | [2],[3],[7] | $ 1,310 | [2],[3],[7] | $ 2,918 | [2],[3],[7] | $ 109 | [2],[3],[7] | $ 363 | [2],[3],[7] | $ 653 | [2],[3],[7] | $ 323 | [2],[3],[7] | $ 507 | [2],[3],[7] | $ 60 | [2],[3],[7] | $ 17 | [2],[3],[7] | $ 2,673 | [2],[3],[7] | |||||||||||||||||||
| Per Annum Dividend Rate | 7.00% | [1] | 6.204% | [2],[3] | 8.20% | [2],[3] | 6.625% | [2],[3] | 7.25% | [2],[3] | 7.25% | 6.00% | 6.375% | [2],[5] | 6.70% | [2],[6] | 6.25% | [2],[6] | 8.625% | [2],[5] | 4.00% | 8.00% | 8.125% | |||||||||||||||||||||||||||||||||
| Dividend Payment Rate, Variable | three-month Libor | three-month Libor | three-month Libor | three-month Libor | three-month Libor | three-month Libor | three-month Libor | |||||||||||||||||||||||||||||||||||||||||||||||||
| Dividend Payment Basis Spread | 3.63% | 3.64% | 0.75% | 0.65% | 0.75% | 0.50% | 0.35% | |||||||||||||||||||||||||||||||||||||||||||||||||
| Preferred Stock, Discount on Shares | $ 333 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Minimum Interest Rate Per Annum | 3.00% | 4.00% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
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