Annual report pursuant to Section 13 and 15(d)

Statements of Consolidated Changes in Equity (Parenthetical)

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Statements of Consolidated Changes in Equity (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Class of Stock [Line Items]      
Common stock dividends per share $ 0.00 $ 0.60 $ 0.60
Preferred stock dividends per share $ 0.00 $ 1.32 $ 1.76