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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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