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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

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