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Consolidated Statements of Changes in Equity (Parentheticals) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Dividends per Common Share (in Dollars per share) | $ 0.78 | $ 0.73 | $ 0.66
Series F Preferred Stock [Member] |  |  |
Dividends per Depositary share (in Dollars per share) | $ 1.0344 | $ 1.6625 | $ 1.6625
Series G Preferred Stock [Member] |  |  |
Dividends per Depositary share (in Dollars per share) | $ 1.5016 | $ 1.9375 | $ 1.9375
Series H Preferred Stock [Member] |  |  |
Dividends per Depositary share (in Dollars per share) | $ 1.725 | $ 1.7250 | $ 0.5798
Series I Preferred Stock [Member] |  |  |
Dividends per Depositary share (in Dollars per share) | $ 1.1708 |  |
Series J Preferred Stock [Member] |  |  |
Dividends per Depositary share (in Dollars per share) | $ 0.5958 |  |
Series K Preferred Stock [Member] |  |  |
Dividends per Depositary share (in Dollars per share) | $ 0.0938 |  |

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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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- Definition Aggregate dividends paid during the period for each share of preferred stock outstanding. + References No definition available. + Details
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