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Consolidated Statements of Changes in Equity (Parentheticals) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Series H Preferred Stock [Member]
Dividends per depository share (in dollars per share)			$ 1.485
Series I Preferred Stock [Member]
Dividends per depository share (in dollars per share)	$ 1.50	$ 1.50	1.50
Series J Preferred Stock [Member]
Dividends per depository share (in dollars per share)	1.375	1.375	1.375
Series K Preferred Stock [Member]
Dividends per depository share (in dollars per share)	1.40625	1.40625	$ 1.40625
Series I Preferred Stock Redeemed [Member]
Dividends per depository share (in dollars per share)	0.9625
Series L Preferred Stock [Member]
Dividends per depository share (in dollars per share)	0.48047
Series M Preferred Stock [Member]
Dividends per depository share (in dollars per share)	0.0401
Additional Paid-in Capital [Member]
Sale of interests in investments, tax			$ 16
Dividends per common share (in dollars per share)	$ 1.09	$ 1.035	$ 0.975

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+ References

Reference 1: 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=27012166&loc=d3e187085-122770

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