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Statement of Changes in Consolidated Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Common stock, dividends declared per share (usd per share) | $ 0.12 | $ 0.24 | $ 0.24 |  |
Preferred Class A |  |  |  |  |
Preferred, dividends per share (usd per share) | 3.75 | 3.75 | 3.75 |  |
Preferred Class B |  |  |  |  |
Preferred, dividends per share (usd per share) | $ 0 | $ 0 | $ 20.1563 | $ 26.8750 | $ 26.8750

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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