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Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Series I Preferred Stock [Member]
Dividends per depository share (in dollars per share)	$ 0.375	$ 0.375
Series J Preferred Stock [Member]
Dividends per depository share (in dollars per share)	0.3438	0.3438
Series K Preferred Stock [Member]
Dividends per depository share (in dollars per share)	0.3516	0.3516
Series L Preferred Stock [Member]
Dividends per depository share (in dollars per share)	0.3203
Series M Preferred Stock [Member]
Dividends per depository share (in dollars per share)	0.3281
Dividends per common share (in dollars per share)	$ 0.28	$ 0.27

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=27012166&loc=d3e187085-122770

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- Definition

Aggregate dividends paid during the period for each share of preferred stock outstanding.

+ References

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