Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares		3 Months Ended		9 Months Ended
	Aug. 16, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per common share (in $ per share)	$ 0.45	$ 0.45	$ 0.45	$ 1.35	$ 1.35
Cash dividends declared per preferred share (in $ per share)		$ 1.81	$ 0	$ 5.4375	$ 0