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Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parentheticals) (USD $) | 9 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Common Stock [Member] |  |
Class Depositary Share | $ 0.63 | $ 0.57
Series F Preferred Stock [Member] |  |
Class Depositary Share |  | $ 1.0344
Series G Preferred Stock [Member] |  |
Class Depositary Share |  | $ 1.4532
Series H Preferred Stock [Member] |  |
Class Depositary Share | $ 1.2938 | $ 1.2938
Series I Preferred Stock [Member] |  |
Class Depositary Share | $ 1.125 | $ 0.79583
Series J Preferred Stock [Member] |  |
Class Depositary Share | $ 1.0313 | $ 0.2521
Series K Preferred Stock [Member] |  |
Class Depositary Share | $ 1.0547 |

X
- Definition Aggregate dividends paid during the period for each share of preferred stock outstanding. + References No definition available. + Details
Name: | us-gaap_PreferredStockDividendsPerShareCashPaid
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration