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Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parentheticals) (USD $) | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
Common Stock [Member] |  |
Dividends per Depositary Share (in Dollars per share) | $ 0.42 | $ 0.38
Series F Preferred Stock [Member] |  |
Dividends per Depositary Share (in Dollars per share) |  | $ 0.8312
Series G Preferred Stock [Member] |  |
Dividends per Depositary Share (in Dollars per share) |  | $ 0.9688
Series H Preferred Stock [Member] |  |
Dividends per Depositary Share (in Dollars per share) | $ 0.8625 | $ 0.8625
Series I Preferred Stock [Member] |  |
Dividends per Depositary Share (in Dollars per share) | $ 0.7500 | $ 0.4208
Series J Preferred Stock [Member] |  |
Dividends per Depositary Share (in Dollars per share) | $ 0.6875 |
Series K Preferred Stock [Member] |  |
Dividends per Depositary Share (in Dollars per share) | $ 0.7032 |

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- 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