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Statement of Changes in Consolidated Equity (unaudited) (Parenthetical) - $ / shares | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Common stock, dividends per share | $ 0.12 | $ 0.18
Preferred Class A [Member] |  |
Preferred, dividends per share | 0.9375 | 0.9375
Preferred Class B [Member] |  |
Preferred, dividends per share | $ 6.71875 | $ 6.71875

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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