Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parentheticals) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Common Stock [Member]
Dividends per Common Share (in dollars per share)	$ 0.255	$ 0.24
Preferred Stock [Member] | Series H Preferred Stock [Member]
Dividends per Depositary share (in dollars per share)		0.4313
Preferred Stock [Member] | Series I Preferred Stock [Member]
Dividends per Depositary share (in dollars per share)	0.375	0.375
Preferred Stock [Member] | Series J Preferred Stock [Member]
Dividends per Depositary share (in dollars per share)	0.3438	0.3438
Preferred Stock [Member] | Series K Preferred Stock [Member]
Dividends per Depositary share (in dollars per share)	$ 0.3516	$ 0.3516
Additional Paid-in Capital [Member]
Sale of interests in investments, tax		$ 16