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Statements of Consolidated Changes in Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |
Preferred stock dividends per share | $ 0.00 | $ 0.00 | $ 1.32

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- Definition Aggregate dividends paid during the period for each share of preferred stock outstanding. + References No definition available. + Details
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