Condensed Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares		3 Months Ended
	Feb. 21, 2019	Mar. 31, 2019	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per common share (in $ per share)	$ 0.55	$ 0.55	$ 0.45
Cash dividends declared per preferred share (in $ per share)	$ 1.8125	$ 1.8125	$ 1.8125