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Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
May 15, 2018 | May 01, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Statement of Stockholders' Equity [Abstract] |  |  |  |  |  |
Cash dividends declared per common share (in $ per share) | $ 0.45 |  | $ 0.45 | $ 0.45 | $ 0.90 | $ 0.90
Cash dividends declared per preferred share (in $ per share) |  | $ 1.8125 | $ 1.81 | $ 1.81 | $ 3.63 | $ 3.63

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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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- References No definition available. + Details
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