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Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parentheticals) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2016 | Jun. 30, 2015
Common Stock [Member] |  |
Dividends per common share (in dollars per share) | $ 0.51 | $ 0.48
Preferred Stock [Member] | Series H Preferred Stock [Member] |  |
Dividends per depository share (in dollars per share) |  | 0.8625
Preferred Stock [Member] | Series I Preferred Stock [Member] |  |
Dividends per depository share (in dollars per share) | 0.75 | 0.75
Preferred Stock [Member] | Series J Preferred Stock [Member] |  |
Dividends per depository share (in dollars per share) | 0.6875 | 0.6875
Preferred Stock [Member] | Series K Preferred Stock [Member] |  |
Dividends per depository share (in dollars per share) | $ 0.7032 | $ 0.7032
Additional Paid-in Capital [Member] |  |
Sale of interests in investments, tax |  | $ 16

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