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Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parentheticals) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Dividends, per common share | $ 0.21 | $ 0.19
Series F Preferred Stock [Member] |  |
Dividends, per Depositary Share |  | $ 0.4156
Series G Preferred Stock [Member] |  |
Dividends, per Depositary Share |  | $ 0.4844
Series H Preferred Stock [Member] |  |
Dividends, per Depositary Share | $ 0.4313 | $ 0.4313
Series I Preferred Stock [Member] |  |
Dividends, per Depositary Share | $ 0.3750 | $ 0.0458
Series J Preferred Stock [Member] |  |
Dividends, per Depositary Share | $ 0.3438 |
Series K Preferred Stock [Member] |  |
Dividends, per Depositary Share | $ 0.3516 |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 + Details
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